This study presents a solution to solid waste problems, focusing on spent lithium-ion batteries (LiBs) and iron ore tailings (IOT) from the Mariana environmental accident in Brazil. The approach involves the production CoFe2O4 from LiBs and IOT, which serves as a catalyst for solar photo-Fenton reactions for methylene blue (MB) decolorization and as an electrochemical sensor for ascorbic acid (AA) detection. Chemical analysis showed recycling potential, with 45.22 ± 0.22% m m−1 Co from LiBs and 14.9 ± 1.5% m m−1 Fe from IOT, determined by inductively coupled plasma atomic emission spectroscopy (ICP OES) and flame atomic absorption spectrometry (FAAS). The sol-gel synthesized CoFe2O4 exhibited a crystallite size of 51.9 ± 1.3 nm and agglomerated crystal clusters. Recycled-CoFe2O4 exhibited a 98.1% MB decolorization efficiency in 60 min under solar irradiation and remained above 92.3% in all 7 reuse cycles. The electrochemical sensor exhibited a coefficient of determination of 0.9987, a sensitivity of 3.352 ± 0.0428 μA mol L−1, and a limit of detection of 0.5511 µM in the concentration range of 1.96 to 23.08 mmol L−1 for AA detection. This study demonstrates the potential of recycled-CoFe2O4 in an environmentally friendly dye removal and as an electrochemical sensor, offering sustainable waste management and resource utilization with solar energy. problems lithiumion lithium ion (LiBs IOT (IOT Brazil CoFeO CoFe O CoFe2O photoFenton photo Fenton (MB (AA 4522 45 22 45.2 022 0 0.22 m1 1 m− 149 14 9 14. 15 5 1.5 ICP OES FAAS. FAAS . (FAAS) solgel sol gel 519 51 51. 13 3 1. clusters RecycledCoFe2O4 RecycledCoFeO Recycled Recycled-CoFe2O 981 98 98.1 6 923 92 92.3 cycles 09987 9987 0.9987 3352 352 3.35 00428 0428 0.042 L1 L 05511 5511 0.551 196 96 1.9 2308 23 08 23.0 L− recycledCoFe2O4 recycledCoFeO recycled recycled-CoFe2O energy 452 4 2 45. 02 0.2 (FAAS RecycledCoFe RecycledCoFe2O 98. 92. 0998 998 0.998 335 35 3.3 0042 042 0.04 0551 551 0.55 19 230 23. recycledCoFe recycledCoFe2O 0. 099 99 0.99 33 3. 004 04 0.0 055 55 0.5 09 0.9 00 05

Cupuaçu (Theobroma grandiflorum Schum.) is an Amazonian fruit rich in antioxidants potential due to its phenolic compounds. Its seeds produce cupulate, a chocolate-like product, and the residue remains rich in biocompounds. This study aimed to optimize and compare microwave-assisted (MAE) and high pressure/temperature extraction (HPTE) of polyphenolic and flavonoid compounds from cupuaçu seed by-products. A Box-Behnken 33 factorial design assessed the influence of extraction time, solid/liquid ratio, and ethanol concentration. Responses included total polyphenol content, total flavonoid content, and anti-radical power via the ABTS (2,2-azino-bis-3-ethylbenzothiazoline-6-sulphonic acid) method. In optimum conditions, MAE had the highest total polyphenol content and HPTE for flavonoids. Optimal conditions for both methods were 65% (m/v) ethanol concentration, 45 min extraction time, and 0.03 g mL−1 solid/liquid ratio. MAE and HPTE achieved greater recovery of (−)-epicatechin and (−)-epigallocatechin-3-gallate compared to percolation. Both techniques proved viable for recovering polyphenols from cupuaçu seed by-products, in less time and with less solvent. Thus, cupuaçu by-products can be a sustainable and functional food source, with MAE and HPTE providing high yields and quality extracts rich in polyphenols. Theobroma Schum. Schum cupulate chocolatelike chocolate like product biocompounds microwaveassisted microwave assisted (MAE pressuretemperature pressure temperature (HPTE byproducts. byproducts by products. products BoxBehnken Box Behnken 3 solidliquid solid liquid ratio concentration antiradical anti radical 2,2azinobis3ethylbenzothiazoline6sulphonic 22azinobis3ethylbenzothiazoline6sulphonic azinobisethylbenzothiazolinesulphonic 2,2 azino bis ethylbenzothiazoline 6 sulphonic 2 acid method flavonoids 65 m/v mv m v (m/v 4 003 0 03 0.0 mL1 mL 1 mL− −epicatechin epicatechin − −epigallocatechin3gallate epigallocatechin3gallate epigallocatechingallate epigallocatechin gallate percolation byproducts, products, solvent Thus source 2azinobis3ethylbenzothiazoline6sulphonic azinobis 22 2, 00 0.

Nanoparticles of TiO2 doped with low amount of Fe were synthesized from natural ilmenite obtained from alluvial gold mine wastes. The obtained TiO2 were characterized using X-ray diffraction (XRD), X-ray fluorescence (XRF), Fourier-transform infrared spectroscopy (FTIR), UV-Vis diffuse reflectance, thermogravimetric analysis/differential scanning calorimetry (TGA/DSC), N2 adsorption-desorption isotherms, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The results confirm the formation of mesoporous TiO2 nanoparticles in anatase phase with 0.05 wt.% of iron possibly replacing some titanium places. All the characterizations were performed to the synthesized solid and the reference materials (TiO2 anatase and Degussa P25). The photocatalytic activity of both the synthesized solid and references were evaluated in the photo-oxidation of cyanide in aqueous medium under UV illumination. An experimental design type Box-Behnken was performed choosing three different parameters: the initial concentration of cyanide (50, 150 and 250 ppm) the catalyst load (0.1, 0.5 and 1.0 g L-1) and the oxygen source. The percentage of cyanide conversion was chosen as response in the design obtaining as optimal conditions [CN-]0 = 50 ppm, catalyst load = 0.6 g L-1 and air bubbling. Under these conditions it was reached 32, 32 and 89% of cyanide conversion for Fe-TiO2 synthesized, TiO2 anatase and Degussa P25, respectively. TiO wastes Xray X ray XRD, XRD , (XRD) XRF, XRF (XRF) Fouriertransform Fourier transform FTIR, FTIR (FTIR) UVVis Vis reflectance analysisdifferential analysis differential TGA/DSC, TGADSC TGA/DSC TGA DSC (TGA/DSC) N adsorptiondesorption adsorption desorption isotherms TEM (TEM XPS. XPS . (XPS) 005 0 05 0.0 wt wt. places (TiO P25. P25 P P25) photooxidation photo oxidation illumination BoxBehnken Box Behnken parameters 50, (50 15 25 ppm 0.1, 01 1 (0.1 5 0. 10 1. L1 L source CN0 CN [CN-] 06 6 L- bubbling 3 89 FeTiO2 FeTiO Fe-TiO respectively (XRD (XRF (FTIR (TGA/DSC (XPS 00 P2 (5 2 0.1 (0. [CN- 8 ( (0 [CN

Abstract The organic composition of 65 °% of urban solid waste of the Metropolitan District of Quito originates from food waste, which has negative environmental effects. The purpose of this study was to evaluate the factors related to food waste in homes in the capital and characterize urban solid waste management. The study is quantitative and exploratory. An association analysis was performed for the main categorical variables through calculation of statistical chi squared and an assessment of polychoric relation. A descriptive and multi-scale statistical analyses were performed for focus of the social metabolism to characterize waste management. A noteworthy element was the relation between expenses for purchase of food and non-alcoholic beverages in the last month-household income in the last month (p value < 5 %). Between 2012-2021, the most representative median for waste generation corresponded to the Eugenio Espejo administration, with 141470 t/ year, with a metabolic waste rate of 2.45E-05 (t/year). On the other hand, the Tumbaco administration obtained 30217 t/year and 1.22E-05 t/year, respectively.

Resumen La composición orgánica del 65 % de residuos sólidos urbanos del Distrito Metropolitano de Quito proviene de restos de alimentos, lo que provoca efectos medioambientales negativos. El propósito de esta investigación es evaluar los factores que inciden en el desperdicio de alimentos en los hogares capitalinos y caracterizar la gestión de sus residuos sólidos urbanos. La investigación es cuantitativa de tipo exploratoria. Se realizó un análisis de asociación entre las principales variables categóricas mediante el cálculo del estadístico chi-cuadrado y una evaluación de correlación policórica. Se aplicaron análisis estadístico descriptivo y multiescala del enfoque del metabolismo social para caracterizar la gestión de residuos. Destaca la relación entre el gasto en compra de alimentos y bebidas no alcohólicas en el último mes -ingreso del hogar en el último mes (p valor < 5 %). Entre 2012-2021, la mediana más representativa de generación de residuos corresponde a la administración Eugenio Espejo, con 141 470 t/año, y su tasa metabólica de residuos de 2,45E-05 t/año. En contraste, la administración Tumbaco obtuvo 30 217 t/año y 1,22E-05 t/año, respectivamente.

Resumo A composição orgânica do 65 °% dos resíduos sólidos urbanos do Distrito Metropolitano de Quito provém de restos de alimentos, o qual provoca efeitos negativos ao meio ambiente. O objetivo dessa investigação foi avaliar os fatores incidentes no desperdício de alimentos nos lares da capital e caracterizar a gestão dos resíduos sólidos urbanos. A pesquisa foi quantitativa e exploratória. Fez-se uma análise de associação das variáveis principais com o cálculo do chi-quadrado estatístico e uma avaliação da correlação policórica. Usaram-se análises estadísticos descritivos e multiescala do foco do metabolismo social para caracterizar a gestão dos resíduos. Destacou-se a relação do gasto para a compra de alimentos e bebidas não alcoólicas no último mês -rendas do lar no último mês (p valor < 5 %). Entre os anos 2012-2021, a mediana mais representativa de geração de resíduos foi da administração Eugenio Espejo, com 141 470 t/ano, e uma taxa metabólica de resíduos de 2,45E-05 t/ano. Em contraste, a administração Tumbaco teve 30 217 t/ano e 1,22E-05 t/ano, respetivamente.

Abstract Nowadays, organizations have the responsibility to commit themselves to actions that favor environmental conservation. The present study sought to explore an accompaniment for the management of the environmental component in the activities developed by an organization located in Armenia, Quindío-Colombia. Inter-institutional meetings were held in which a recognition, dialogue and workshop were conducted with the collaborators. A previously validated checklist was used. Subsequently, a descriptive analysis was made of the results obtained. It was found that 40 % of the components lacked actions for environmental conservation. Thus, the accompaniment showed that the collaborators committed themselves to use solid waste, save water and energy. The monitoring resulted in three strategic actions for the water, soil and energy components. The organization showed great interest in the process and an intersectoral link was established. The study proposes a baseline for the management of the environmental component of the study area; it resulted in an accompaniment and representative participation with significant progress towards the conservation of the environment within the organization.

Resumen Actualmente, las organizaciones se encargan de comprometerse con acciones que favorezcan la conservación del medioambiente. El presente estudio explora un acompañamiento para la gestión del componente ambiental en las actividades desarrolladas de una organización ubicada en Armenia, Quindío-Colombia. Se realizaron reuniones interinstitucionales en las que se realizó un reconocimiento, diálogo y taller con los colaboradores. Se utilizó una lista de verificación previamente validada. Posteriormente, se realizó un análisis descriptivo de los resultados obtenidos. Se encontró que el 40 % de los componentes carecen de acciones para la conservación del medioambiente. De tal manera, el acompañamiento arrojó que los colaboradores se comprometieron a aprovechar los residuos sólidos, ahorrar agua y energía. El acompañamiento derivó en tres acciones estratégicas para los componentes de agua, suelo y energía. La organización demostró un gran interés en el proceso y se logró establecer un vínculo intersectorial. El estudio plantea una línea base de gestión del componente ambiental del área de estudio; derivó en un acompañamiento y participación representativa con avances significativos hacia la conservación del medioambiente dentro de la organización.

Resumo Atualmente, as organizações têm a responsabilidade de se comprometerem com acções que favoreçam a conservação do ambiente. O presente estudo procurou explorar um acompanhamento para a gestão da componente ambiental nas actividades de uma organização situada em Armenia, Quindío-Colômbia. Foram realizadas reuniões interinstitucionais em que se procedeu a um reconhecimento, diálogo e workshop com os colaboradores. Foi utilizada uma lista de controlo previamente validada. Posteriormente, procedeu-se a uma análise descritiva dos resultados obtidos. Verificou-se que 40 % dos componentes careciam de acções para a conservação do ambiente. Desta forma, o acompanhamento mostrou que os colaboradores se comprometeram a utilizar os resíduos sólidos, a poupar água e energia. O acompanhamento resultou em três acções estratégicas para as componentes água, solo e energia. A organização mostrou grande interesse no processo e foi estabelecida uma ligação intersectorial. O estudo fornece uma base de referência para a gestão da componente ambiental da área de estudo; resultou num apoio e numa participação representativa com progressos significativos para a conservação do ambiente na organização.

Abstract The objective of this study is to characterize the industrial solid waste generated by a geopolymeric composites precast industry in Goiás and use them in the production of mortar, in partial replacement of cement in the contents of 5%, 10%, 15% and 25%, due to its probable pozzolanic effect. For the research the residue underwent crushing in a hammer mill and sieving in a #40 mesh conducted in the industry itself. Then, physical-chemical analyzes were conducted to verify if the residue meets the parameters established by NBR 12653 (ABNT, 2014) Pozzolanic Materials - Requirements. The residue showed potential to be used as pozzolana, as in the particle size analysis only 19% was retained on sieve #325 and the moisture content also met the parameters of the aforementioned standard. However, the fire loss content and the alkali content available in ���� 2 �� were higher than the standard requirements, because the residue contains tire shavings and sodium hydroxide (NaOH) in its composition. In relation to the performance index with Portland cement at 28 days, the mortar with 5% residue in its composition met the standard conditions, but the performance with lime did not obtain the desired result, as the resistance decreased. After analysis, it has been realized that the residue does not qualify as pozzolan but can be used as a filler. 5 10 10% 15 25 25% effect 40 #4 itself Then physicalchemical physical chemical 1265 ABNT, ABNT (ABNT 2014 Requirements pozzolana 19 325 #32 However ��� � requirements NaOH (NaOH days conditions result decreased filler 1 4 # 126 201 32 #3 12 20 3

Resumo O objetivo deste estudo é caracterizar os resíduos sólidos industriais gerados por uma indústria goiana de pré-moldados de compósitos geopoliméricos e utilizá-los na produção de argamassa, em substituição parcial ao cimento nos teores de 5%, 10%, 15% e 25%, devido ao seu provável efeito pozolânico. Para a pesquisa o resíduo passou por trituração em moinho martelo e peneiramento em malha #40 realizados na própria indústria. Em seguida, foram realizadas análises físico-químicas para verificar se o resíduo atende aos parâmetros estabelecidos pela NBR 12653 (ABNT, 2014b) Materiais Pozolânicos - Requisitos. O resíduo apresentou potencial para ser utilizado como pozolana, pois na análise granulométrica apenas 19% ficaram retidos na peneira #325 e o teor de umidade também atendeu aos parâmetros da referida norma. No entanto o teor de perda ao fogo e o teor de álcalis disponíveis em Na 2 �� foram maiores do que os requisitos da norma, devido ao fato de o resíduo possuir em sua composição, raspas de pneu e hidróxido de sódio (NaOH). Em relação ao índice de desempenho com cimento Portland aos 28 dias, a argamassa que possui em sua composição 5% de resíduo atendeu as condições da norma, mas o desempenho com cal não obteve o resultado desejado, pois a resistência diminuiu. Após análise, percebeu-se que o resíduo não se enquadra como pozolana, mas pode ser usado como enchimento. prémoldados pré moldados utilizálos utilizá los 5 10 10% 15 25 25% pozolânico 40 #4 seguida físicoquímicas físico químicas 1265 ABNT, ABNT (ABNT 2014b b Requisitos pozolana 19 325 #32 norma � NaOH. NaOH . (NaOH) dias desejado diminuiu percebeuse percebeu enchimento 1 4 # 126 32 #3 (NaOH 12 3

Abstract Fermentation in a solid medium is a technique used for the production of chitin, pigments, proteins and lipids. In the present work, changes in the chemical and microbiological composition were evaluated in micro silages of shrimp (Litopeneus vanamei) and grasshopper (Sphenarium purpurascens) exoskeletons, fermented with a commercial inoculum of Lactobacillus plantarum AVG-112. The amount of molasses for fermentation, proximal composition and microbiological count of the silages, were determined. The waste was mixed with sugarcane molasses as a carbon source and inoculated using a commercial strain (Lactobacillus plantarum AVG-112). After 5 days of fermentation, both silages presented acceptable physical and chemical characteristics. Total coliforms, molds and yeasts were not present and were inhibited by the ensiling process. We concluded that fermentation in a solid medium has suitable characteristics for use as a food supplement for aquatic organisms.

Resumen La fermentación en medio sólido es una técnica utilizada para la producción de quitina, pigmentos, proteínas y lípidos. En el presente trabajo se evaluaron los cambios en la composición química y microbiológica en micro ensilados de exoesqueletos de camarón (Litopeneus vanamei) y chapulín (Sphenarium purpurascens) fermentados con un inoculo comercial de Lactobacillus plantarum AVG-112. Se determinó la cantidad de melaza para la fermentación, la composición proximal y la cuenta microbiológica de los ensilados. Los desechos se mezclaron con melaza de caña de azúcar como fuente de carbono y se inoculó usando una cepa comercial (Lactobacillus plantarum AVG-112). A los 5 d de fermentación ambos ensilados presentaron características físicas y químicas aceptables. Los coliformes totales, mohos y levaduras no estuvieron presentes siendo inhibidos por el proceso de ensilaje. Concluimos que la fermentación en medio sólido tiene características adecuadas para su utilización como suplemento en alimentos para organismos acuáticos.

Resumen La transición de lo rural a lo semiurbano en Yucatán ocurre principalmente en las cabeceras municipales, y trae consigo problemas de gestión de los residuos. Las autoridades municipales son las encargadas del Manejo Integral de los Residuos Sólidos Urbanos (MIRSU); pero en últimos años, la asociación entre el sector público y el privado para la gestión de los residuos resulta una estrategia eficaz. Existen pocos estudios sobre el MIRSU en zonas rurales o semiurbanas y la disposición a pagar de los usuarios, información que ayudaría a los creadores de política pública a diseñar planes y programas adecuados para su gestión. Por lo tanto, el objetivo de este estudio es determinar los factores socioeconómicos asociados a la disposición a pagar por el MIRSU de los usuarios de municipios semiurbanos de Yucatán. Se realizaron 1,144 encuestas en 6 localidades semiurbanas de Yucatán, los datos se analizaron mediante estadística descriptiva e inferencial con un modelo econométrico de regresión Tobit. El 69,75% de los usuarios encuestados declararon estar dispuestos a pagar por el manejo integral de los residuos sólidos un monto promedio de 17,65 pesos mexicanos (0,85 dólares estadounidenses). La disposición a pagar disminuye cuando predomina el idioma maya, y mientras menos activos físicos y habitaciones tenga el hogar. Existen elementos culturales y sociales arraigados en la recolección de residuos sólidos, este sistema integral puede ir acompañado de otro tipo de incentivos económicos para modificar el comportamiento de los consumidores hacia algo más beneficioso para el medio ambiente, tal como el ingreso familiar.

Abstract In Yucatan, the transition from rural to semi-urban communities has occurred mainly in the municipality seats; this transition comes with the problems of waste management. The municipalities oversee the Integral Urban Solid Waste Management (IUSWM); but in recent years, the public-private partnership for waste management has proved to be an effective strategy. There are few studies on the IUSWM in rural or semi-urban areas and the users’ willingness to pay, information that would help public policymakers to design adequate plans and programs for its management. Therefore, the purpose of this study is to determine the socioeconomic factors associated with the willingness to pay for the IUSWM of users in semi-urban municipalities of Yucatan. A total of 1,144 interviews were conducted in 6 semi-urban localities in Yucatan, and the data were analyzed using descriptive and inferential statistics with a Tobit regression econometric model. 69.75% of the surveyed users declared that they were willing to pay an average of 17.65 Mexican pesos (0.85 U.S. dollars) for the integral urban solid waste management. The willingness to pay decreases when the Mayan language predominates among the member of the household, and when they have fewer tangible assets and rooms. There are cultural and social factors rooted in solid waste collection, this integrated system may be accompanied by other types of economic incentives to modify consumers’ behavior towards something more beneficial for the environment, such as the homes’ income.

Resumen Durante las últimas décadas en Puno, Perú, la problemática de la contaminación se fue agudizando por la acción combinada del crecimiento desordenado de la población urbana, gestión deficiente de residuos sólidos, descarga de aguas servidas sin tratamiento en la bahía del lago Titicaca y prácticas de sanidad e higiene inadecuadas; situaciones que afectan severamente el ambiente y la salud humana. El objetivo del estudio fue caracterizar las actitudes y comportamientos proambientales de la población de la ciudad de Puno en relación al saneamiento, la contaminación y la gestión ambiental. La investigación es no experimental, cuantitativa, trans¬versal, descriptiva, correlacional y nivel de análisis micro. El universo de estudio fue la población mayor de 18 años del área urbana, que comprende 97.264 habitantes; la muestra, deter¬minada al azar simple, fue de 382 personas. Se aplicó un cuestionario estructurado. El análisis descriptivo, inferencial y prueba de hipótesis se realizó con el software estadístico SPSS. Los resultados señalan que las actitudes ambientales de la mayoría de la población son positivas respecto a factores y fuentes de contaminación y efectos en la salud humana; contrariamente, las prácticas ambientales son inadecuadas en gestión ambiental en el hogar y condiciones de sanidad e higiene en la vivienda. Se concluye, que la mejora sostenible de actitudes y comportamientos proambientales, demanda de una nueva política pública de educación ambiental, cuya implementación incorpore la participación efectiva de la sociedad civil con base a un sistema de incentivos.

Abstract During the last decades in Puno, Peru, the problem of contamination has worsened due to the combined action of the disorderly growth of the urban population, poor management of solid waste, discharge of untreated sewage into the bay of Lake Titicaca and practices of inadequate sanitation and hygiene, severely affecting the environment and human health. The objective of the study was to characterize the pro-environmental attitudes and behaviors of the city’s population of Puno in relation to sanitation, pollution and environmental management. The research is nonexperimental, quantitative, cross-sectional, descriptive, correlational and micro level of analysis. The universe of study was the population over 18 years of age in the urban area, which comprises 97,264 inhabitants; the sample, determined at simple random, was 382 people. A structured questionnaire was applied. Descriptive and inferential analysis and hypothesis testing were performed with SPSS statistical software. The results indicate that the environmental attitudes of the majority of the population are positive regarding factors and sources of pollution and effects on human health. On the contrary, environmental practices are inadequate in environmental management in the home and health and hygiene conditions in the home. It is concluded that the sustainable improvement of pro-environmental attitudes and behaviors demands a new public policy of environmental education, whose implementation incorporates the effective participation of civil society based on an incentive system.

ABSTRACT This work determined the ecological footprint of the National Center for Applied Electromagnetism, a science institution attached at the Universidad de Oriente, Santiago de Cuba. The categories analyzed to carry out the calculations of CO2 emissions and the ecological footprint were: Water, Built surface, Electricity Consumption, Mobility, Paper, Non-hazardous solid waste, Hazardous waste, Food, Services and Production of Magnetic Conditioners. The methodology of Doménech (2009) and the methodology for calculating the ecological footprint in universities of López Álvarez et al. (2009) of the Sustainable Development Office, University of Santiago de Compostela were used as a basis. The results obtained for the year 2022 reflect that the National Center for Applied Electromagnetism needs an area of 52,984 ha/year of forest to regenerate the natural resources that the center uses for the satisfaction of it social demand. Similarly, it requires 89,096 hag standard forest to assimilate CO2 emissions.

RESUMEN El presente trabajo desarrolló el cálculo de la huella ecológica del Centro Nacional de Electromagnetismo Aplicado, entidad de ciencia adscrita a la Universidad de Oriente, Santiago de Cuba. Las categorías analizadas para realizar los cálculos de las emisiones de CO2 y de la huella ecológica fueron: Agua, Superficie construida, Consumo de Electricidad, Movilidad, Papel, Residuos sólidos no peligrosos, Residuos peligrosos, Alimentos, Servicios y Producción de Acondicionadores Magnéticos. Se utilizó como base la metodología de Doménech (2009) y la metodología para el cálculo de la huella ecológica en universidades de López Álvarez y colaboradores (2009) de la Oficina de Desarrollo Sostenible, Universidad de Santiago de Compostela. Los resultados obtenidos para el año 2022 reflejan que el Centro Nacional de Electromagnetismo Aplicado necesita un área de bosques de 52,984 ha/año para regenerar los recursos naturales que se demandan por el centro para satisfacer su objeto social. Asimismo, requiere de 89,096 hag de bosque estándar mundial para asimilar las emisiones de CO2 generadas.

The Cuban industry La Purísima produces sauces and dressings for the national gastronomy; but it does not have a process for the deposition of chicken eggshells, as a result, 220 kg of eggshells are dumped daily, which generate a negative impact on the environment. The research evaluates the drying of hen eggshells with protein membrane on a laboratory scale, with a view to revalorizing this waste in the production of a calcium-rich poultry feed supplement. The calcium carbonate content of the shell was determined to confirm the potential application of the residue. The drying curve and drying rate curve was obtained by experimental measurement in a drying oven under aeration at 90 °C. The calcium carbonate content of the residue was 93,33 %. The drying curve was fitted to an exponential mathematical model as a function of the drying constant and the moisture in equilibrium at a temperature of 90 °C. The drying regime of the solid presented a period of decreasing drying rate up to a moisture value of 0,021 kg of water / kg of dry solid, for lower values, this presented a deviation from the exponential function in its rate. The utilization of residual eggshells proved to be an attractive source of calcium carbonate with potential for its use in the production of feed supplement for poultry.

RESUMEN En la Industria cubana La Purísima se producen salsas y aderezos para la gastronomía nacional; pero no dispone de un proceso para la deposición de las cáscaras de huevo de gallina, como resultado, se vierten diariamente 220 kg de cáscaras que generan un impacto negativo en el medio ambiente. La investigación evalúa el secado de las cáscaras de huevo de gallina con membrana proteica a escala de laboratorio, con vistas a revalorizar este residuo en la producción de un suplemento alimenticio para aves de corral rico en calcio. Se determinó el contenido de carbonato de calcio en la cáscara para confirmar la aplicación potencial del residuo. La curva de secado y del régimen de secado se obtuvo por medición experimental en un secadero bajo aireación a 90 °C. El contenido de carbonato de calcio en el residual fue de 93,33 %. La curva de secado se ajustó a un modelo matemático exponencial en función de la constante de secado y la humedad en equilibrio a una temperatura de 90 °C. El régimen de secado del sólido presentó un período de velocidad de secado decreciente hasta un valor de humedad de 0,021 kg de agua / kg de sólido seco, para valores inferiores presentó una desviación de la función exponencial en su velocidad. El aprovechamiento de las cáscaras de huevo residuales resultó ser una fuente atractiva de carbonato de calcio con potencialidades para su utilización en la elaboración de suplemento alimenticio para aves de corral.

RESUMEN Introducción: Los brotes recurrentes de dengue subrayan la necesidad de abordajes más efectivos en la prevención y control de vectores. A menudo, las intervenciones se centran en un enfoque biomédico y de promoción de la salud desde un enfoque individual, sin integrar factores socioambientales ni ser evaluados científicamente Objetivo: Evaluar el impacto de la recolección de residuos domésticos de gran tamaño sobre potenciales criaderos de mosquitos transmisores del dengue en Asunción, Paraguay durante los años 2017 a 2021. Material y métodos: Estudio cuasiexperimental, longitudinal, donde se encuestaron 350 hogares, como línea de base durante el 2017 y una línea de cierre en 108 hogares en 2021. Se utilizó el método de Diferencia en Diferencia (DID) para comparar la presencia de criaderos antes y después de la intervención en 43 hogares intervenidos y 65 no intervenidos. Resultados: La recolección diferenciada fue utilizada principalmente por aquellos hogares que tenían una gran cantidad de residuos sólidos de gran tamaño, pero no para deshacerse de todos estos objetos, sino sólo de una parte (DID de -52% en el número total de criaderos y DID de 1% en número de hogares con criaderos). Encontramos una reducción significativa en el número de total de criaderos de gran tamaño, pero no observamos diferencias en el número total de hogares con criaderos. Factores subjetivos, como la creencia de que los objetos en desuso podrían llegar a ser útiles en el futuro explicaban en gran medida su presencia en los hogares, incluso con el servicio disponible. Conclusiones: El enfoque de la gestión municipal en los residuos voluminosos puede contribuir a la prevención del dengue por el hecho de que no constituyen residuos de generación rápida en los hogares, y su eliminación puede tener un impacto relativamente duradero. El factor subjetivo relacionado con la presencia de estos criaderos en los hogares debe ser objeto de mayores estudios.

ABSTRACT Introduction: Recurrent dengue outbreaks underscore the need for more effective approaches to vector prevention and control. Often, interventions focus on a biomedical and health promotion approach from an individual approach, without integrating socio-environmental factors or being scientifically evaluated. Objetive: To evaluate the impact of large household waste collection on potential breeding sites of dengue-transmitting mosquitoes in Asuncion, Paraguay during the years 2017 to 2021. Material and methods: Quasi-experimental, longitudinal study, where 350 households were surveyed, as a baseline during 2017 and a closing line in 108 households in 2021. The Difference-in-Difference (DID) method was used to compare the presence of breeding sites before and after the intervention in 43 intervened and 65 non-intervened households. Results: Differentiated collection was mainly used by those households that had a large amount of large solid waste, but not to dispose of all these objects, but only part of them (DID of -52% in the total number of breeding sites and DID of 1% in the number of households with breeding sites). We found a significant reduction in the total number of large breeding sites but did not observe differences in the total number of households with breeding sites. Subjective factors, such as the belief that disused objects could become useful in the future, were largely responsible for the reduction in the number of large breeding sites. Conclusions: The municipal management approach to bulky waste can contribute to dengue prevention because it does not constitute rapidly generated waste in households, and its disposal can have a relatively long-lasting impact. The subjective factors related to the presence of these breeding sites in households warrant further study.

Abstract Citrus production in Colombia is divided into six productive centers, with a total production of 1,450 thousand tons in 2021. The greater entrepreneurial activity stands out in the West and a lower level in the South, which generates 230 thousand tons per year of citrus waste, posing challenges in terms of pollution and wet/semi-solid waste management. This study evaluates the industrial potential of these waste products for strengthening the national citrus industry, considering three aspects: raw materials availability, technological opportunities, and market opportunities. The results indicate that Colombia has a robust citrus production, with an emphasis on oranges, mandarins, and lemons, and significant potential in the industrialization of the peel, which constitutes between 40% and 60% of the total fruit. To industrialization were identified six key research areas of citrus waste in terms of technological opportunities. Regarding market opportunities, there is observed growth both nationally and internationally in products derived from citrus waste, including essential oils, terpenes, dietary fiber, pectin, citric acid, and biofuels. Colombia is considered a country with great potential for the industrialization of citrus waste, supported by its abundant raw materials, promising technological opportunities, and a growing market. However, improvements in infrastructure, investment in research and development, and the promotion of entrepreneurial culture in the citrus sector are needed to fully capitalize on this opportunity.

Resumen La producción de cítricos en Colombia se divide en seis núcleos productivos con una producción en 2021, de 1450 mil toneladas. Se destaca mayor empresarización en el Occidente y menor nivel en el Sur, lo que genera 230 mil toneladas por año de residuos cítricos, planteando desafíos de contaminación y gestión de desechos húmedos/semi-sólidos. El presente estudio evalúa el potencial industrial de estos residuos para el fortalecimiento de la industria citrícola nacional, considerando tres aspectos: disponibilidad de materia prima, oportunidades tecnológicas y oportunidades de mercado. Los resultados indican que Colombia tiene una sólida producción de cítricos, con énfasis en naranjas, mandarinas y limones, y un potencial significativo en la industrialización de la cáscara, que constituye entre el 40% y el 60% del total de la fruta. Se identifican seis áreas clave de investigación para la industrialización de residuos cítricos en términos de oportunidades tecnológicas. En cuanto a las oportunidades de mercado, se observa un crecimiento tanto a nivel nacional como internacional en productos derivados de residuos cítricos, que incluyen aceites esenciales, terpenos, fibra dietética, pectina, ácido cítrico y biocombustibles. Colombia se considera un país con un gran potencial para la industrialización de residuos cítricos, respaldado por su abundante materia prima, prometedoras oportunidades tecnológicas y un mercado en crecimiento. Sin embargo, se requiere mejorar la infraestructura, invertir en investigación y desarrollo, y promover la cultura empresarial en el sector citrícola para aprovechar al máximo esta oportunidad.

Abstract The study evaluates the generation and recovery capacity of methane at the Villavicencio Landfill in Colombia, using the LandGEM model. It shows a significant increase in methane generation, rising from about 1.5 million cubic meters in 2010 to over 8.5 million in 2020, indicating a growing urgency to implement effective mitigation measures. It was estimated that by the year 2042, the electrical energy production from methane could be 248.067 kW/day, capable of supplying about 43.705 homes monthly. Additionally, thermal energy generation would be 468.572 kWh/day, useful for industrial processes. Management scenarios were proposed, where, for example, operational optimization could increase electric production to 342.333 kW/day, benefiting more than 60.000 homes monthly. The conclusions highlight the direct correlation between the amount of waste and methane generation, and the significant potential for converting these emissions into energy, pointing towards regional energy self-sufficiency and sustainability. Methane recovery represents a valuable alternative to the dependence on fossil fuels and for the development of a circular economy.

Resumen El estudio evalúa la generación y capacidad de recuperación de metano en el Relleno Sanitario de Villavicencio, Colombia, mediante el modelo LandGEM. En donde se observa un aumento significativo en la generación de metano, pasando de alrededor de 1,5 millones de metros cúbicos en 2010 a más de 8,5 millones en 2020, lo que indica una creciente urgencia por implementar medidas de mitigación efectivas. Se estimó que, para el año 2042, la producción de energía eléctrica del metano podría ser de 248.067 kW/día, capaz de abastecer a unos 43.705 hogares mensualmente. Asimismo, se generaría energía térmica de 468.572 kWh/día, útil para procesos industriales. Se plantearon escenarios de gestión, donde, por ejemplo, la optimización operacional podría aumentar la producción eléctrica a 342.333 kW/día, beneficiando a más de 60.000 hogares mensualmente. Las conclusiones resaltan la correlación directa entre la cantidad de residuos y la generación de metano, y el significativo potencial de convertir estas emisiones en energía, apuntando hacia la autosuficiencia y sostenibilidad energética regional. El aprovechamiento del metano representa una alternativa valiosa frente a la dependencia de combustibles fósiles y para el desarrollo de una economía circular.

Abstract The constant growth in global urban waste generation has led to an increasing need to address its management sustainably. Despite the proven effectiveness of converting this waste into energy in various countries, its implementation in Colombia is still in its early stages. In this study, a bibliometric analysis and systematic review of the literature was conducted to assess urban solid waste valorization technologies and their potential integration into biorefineries in the Colombian context. Among the identified technologies, incineration, gasification, pyrolysis, anaerobic digestion, and landfill gas recovery stand out. Anaerobic Digestion emerges as an attractive option due to its versatility. However, there is a recognized imperative to dynamically choose technologies, considering the diversity of contexts and specific conditions in Colombia. Additionally, gasification and pyrolysis appear as viable options, each with its own advantages and challenges, reflecting the complexity and variability in waste management. Concerning landfill gas recovery, its significance as an essential installation in controlled landfills is emphasized, dismissing its consideration as an independent alternative. While the literature suggests that incineration is perceived as less favorable in social, economic, and environmental terms, it is crucial to recognize the dynamics and specificity of each situation. The choice of technologies must be adaptive and guided by a contextual approach that considers the heterogeneity in waste composition, available infrastructure, and other factors that vary significantly from one scenario to another. This dynamic and adaptive approach is essential to address the complexity of urban waste management and find sustainable solutions in the Colombian context.

Resumen El crecimiento constante en la generación de residuos urbanos a nivel global ha generado una creciente necesidad de abordar su gestión de manera sostenible. A pesar de que la conversión de estos residuos en energía ha demostrado ser efectiva en varios países, su implementación en Colombia aún se encuentra en una etapa incipiente. En este estudio, se llevó a cabo un análisis bibliométrico y una revisión sistemática exhaustiva de la literatura con el propósito de evaluar las tecnologías de valorización de los residuos sólidos urbanos, así como su potencial integración en biorrefinerías en el contexto colombiano. Entre las tecnologías más relevantes identificadas se encuentran la incineración, la gasificación, la pirólisis, la digestión anaeróbica y la recuperación de gas de vertedero. La Digestión Anaerobia destaca como una opción atractiva debido a su versatilidad. No obstante, se reconoce la necesidad imperante de adoptar una elección dinámica de tecnologías, considerando la diversidad de contextos y condiciones específicas en Colombia. Además, la gasificación y la pirólisis emergen como opciones viables, cada una con sus propias ventajas y desafíos, reflejando la complejidad y variabilidad en la gestión de residuos. En relación con la recuperación de gas de vertedero, se subraya su importancia como instalación esencial en vertederos controlados, desestimando la consideración de una alternativa independiente. Si bien la literatura sugiere que la incineración se percibe como menos favorable en términos sociales, económicos y ambientales, es crucial reconocer la dinámica y especificidad de cada situación. La elección de tecnologías debe ser adaptativa y orientada por un enfoque contextual que considere la heterogeneidad en la composición de residuos, infraestructura disponible y otros factores que varían significativamente de un escenario a otro. Este enfoque dinámico y adaptativo es esencial para abordar la complejidad de la gestión de residuos urbanos y encontrar soluciones sostenibles en el contexto colombiano.