Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 20 de 15.841
Filtrar
1.
Molecules ; 26(13)2021 Jun 24.
Artigo em Inglês | MEDLINE | ID: mdl-34202485

RESUMO

In this work, steam explosion (SE) was exploited as a potential hydrothermal-humification process of vegetable wastes to deconstruct their structure and accelerate their decomposition to prepare humified substances. Results indicated that the SE process led to the removal of hemicellulose, re-condensation of lignin, degradation of the cellulosic amorphous region, and the enhancement of thermal stability of broccoli wastes, which provided transformable substrates and a thermal-acidic reaction environment for humification. After SE treatment, total humic substances (HS), humic acids (HAs), and fulvic acids (FAs) contents of broccoli samples accounted for up to 198.3 g/kg, 42.3 g/kg, and 166.6 g/kg, and their purification were also facilitated. With the increment of SE severity, structural characteristics of HAs presented the loss of aliphatic compounds, carbohydrates, and carboxylic acids and the enrichment of aromatic structures and N-containing groups. Lignin substructures were proved to be the predominant aromatic structures and gluconoxylans were the main carbohydrates associated with lignin in HAs, both of their signals were enhanced by SE. Above results suggested that SE could promote the decomposition of easily biodegradable matters and further polycondensation, aromatization, and nitrogen-fixation reactions during humification, which were conducive to the formation of HAs.


Assuntos
Benzopiranos/química , Substâncias Húmicas , Eliminação de Resíduos , Vapor , Verduras/química
2.
Environ Monit Assess ; 193(8): 485, 2021 Jul 09.
Artigo em Inglês | MEDLINE | ID: mdl-34241704

RESUMO

The use of landfill gas for power production is a very attractive option in tropical sanitary landfills mainly in developing countries, where the waste composition, water content, and the climate conditions are favorable to a fast depletion of waste organic matter and a robust short term biogas production response. In this paper, the results of long-term monitoring and methane extraction activities in a tropical landfill are presented, and the obtained results are analyzed taking into account the structure of the prokaryotic communities and the fugitive emissions through the temporary covers. It is shown that waste depletion by aerobic processes and fugitive emissions are probable related to the drop in the efficiency of the extraction system verified in the field and that the performance of the temporary covers is of paramount importance when implementing good practices of waste management in sanitary landfills. The fugitive emissions through temporary covers was estimated at about 12% of the methane production in the field, and the distance from drains and sampling depth were confirmed as having an influence on the environmental conditions for waste depletion and on the relative abundance of the bacterial communities.


Assuntos
Poluentes Atmosféricos , Eliminação de Resíduos , Gerenciamento de Resíduos , Poluentes Atmosféricos/análise , Biocombustíveis , Monitoramento Ambiental , Metano/análise , Instalações de Eliminação de Resíduos
3.
Sensors (Basel) ; 21(13)2021 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-34282802

RESUMO

The management and collection of household waste often represents a demanding task for elderly or impaired people. In particular, the increasing generation of plastic waste at home may pose a problem for these groups, as this type of waste accumulates very rapidly and occupies a considerable amount of space. This paper proposes a collaborative infrastructure to monitor household plastic waste. It consists of simple smart bins using a weight scale and a smart application that forecasts the amount of plastic generated for each bin at different time horizons out of the data provided by the smart bins. The application generates optimal routes for the waste-pickers collaborating in the system through a route-planning algorithm. This algorithm takes into account the predicted amount of plastic of each bin and the waste-picker's location and means of transport. This proposal has been evaluated by means of a simulated scenario in Quezon City, Philippines, where severe problems with plastic waste have been identified. A set of 176 experiments have been performed to collect data that allow representing different user behaviors when generating plastic waste. The results show that our proposal enables waste-pickers to collect more than the 80% of the household plastic-waste bins before they are completely full.


Assuntos
Eliminação de Resíduos , Gerenciamento de Resíduos , Idoso , Cidades , Humanos , Filipinas , Plásticos
4.
Chemosphere ; 281: 130884, 2021 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-34289601

RESUMO

The overall status of MSW management in Africa is evaluated systematically, in sight of life cycle indicators such as MSW generation daily per capita, collection and treatment methods. The relations of life cycle indictors with driving factors, including economic level, geographical location, urbanization and solid waste legislation process, are discussed. The results present that the major indicators had obvious regional differences, which can divide Africa into three levels: North Africa and South Africa > West Africa and Central Africa > East Africa. Besides, the disposal methods in North Africa, South Africa and West Africa have evolved from simple open dumping to sanitary landfill, composting and recycle treatment, while opening dumping is still rampant in East Africa. With a combination tool of Principal Component Analysis and Multiple Linear Regression, it was identified that economic growth, urbanization and geographical location are the most critical factors influencing the unbalanced statue of MSW management in Africa. By cluster analysis, unbalance status of MSW management in African countries can be integrated into three grades of MSW management level: good, fair and poor.


Assuntos
Eliminação de Resíduos , Gerenciamento de Resíduos , África Oriental , África Ocidental , Cidades , Resíduos Sólidos/análise , África do Sul , Instalações de Eliminação de Resíduos
5.
J Environ Manage ; 294: 113149, 2021 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-34218073

RESUMO

Anthropogenic structures are increasingly encroaching wildlife habitats, creating conflicts between humans and animals. Scaling up renewable energy requires new infrastructures such as power lines, that cause high mortality among birds since they act as obstacles to flight and are used for perching and nesting, which can result in collisions or electrocutions. These interactions often endanger wildlife populations and may also result in high financial costs for companies. Flight behaviour plays a crucial role in collision risk, and the study of flight altitudes enables us to understand what drives birds to fly at collision risk altitudes. This allows the identification of high-risk areas, conditions and bird behaviours, and the implementation of mitigation measures by power line companies. In this study, we use boosted random tree modelling to identify drivers of white stork (Ciconia ciconia) flight altitudes and to investigate the factors that lead them to fly at collision risk altitudes. We found that the main drivers of flight altitude for this soaring bird species were time of day, distance to the nearest landfill site and cloud cover density. Bird age, habitat type and season were comparatively less important. Collision risk increases during crepuscular hours near landfill sites, also in days with high cloud cover density and during the breeding season. In recent years, hundreds to thousands of storks congregate daily at landfill sites to take advantage of the predictability and superabundance of anthropogenic food waste. Some of these sites have high density of power lines, becoming collision risk hotspots for storks and other landfill users. Despite being susceptible to collision, our results suggest that white storks can avoid power lines to a certain extent, by changing their flight altitude at ca. 80 m from these structures. This study shows that the implementation of mitigation measures for existing power lines should be prioritized in areas in the vicinity of landfill sites within white stork distribution ranges, and the projection of new lines should avoid those areas. These measures would benefit species vulnerable to mortality due to power line collision, and it would also reduce associated power outages and economic costs.


Assuntos
Altitude , Eliminação de Resíduos , Animais , Aves , Voo Animal , Alimentos , Humanos , Melhoramento Vegetal , Instalações de Eliminação de Resíduos
6.
Artigo em Inglês | MEDLINE | ID: mdl-34204829

RESUMO

This study aimed to assess change in school-based food waste after training and implementing the Smarter Lunchrooms Movement (SLM) strategies with school food service workers. This non-controlled trial was implemented in a random sample of 15 elementary and middle schools in a Community Eligibility Program school district in the Northeast, the United States. Baseline and post-intervention food waste measurements were collected at two different time points in each school (n = 9258 total trays measured). Descriptive statistics, independent t-tests, and regression analyses were used to assess SLM strategies' impact on changes in percent food waste. The mean number of strategies schools implemented consistently was 7.40 ± 6.97 SD, with a range of 0 to 28 consistent strategies. Independent t-tests revealed that at post-test, there was a significant (p < 0.001) percent reduction (7.0%) in total student food waste and for each food component: fruit (13.6%), vegetable (7.1%), and milk (4.3%). Overall, a training session on food waste and the SLM strategies with school-based food service workers reduced school food waste. However, the extent of the training and SLM strategies to reduce food waste varied on the basis of the consistency and type of strategies implemented.


Assuntos
Serviços de Alimentação , Eliminação de Resíduos , Preferências Alimentares , Frutas , Humanos , Almoço , Instituições Acadêmicas , Estados Unidos , Verduras
7.
Nutrients ; 13(7)2021 Jun 30.
Artigo em Inglês | MEDLINE | ID: mdl-34209271

RESUMO

To limit the spread of coronavirus SARS-CoV-2, a nationwide lockdown started in Italy in March 2020. In this unpredictable situation, a cross-sectional study using an online questionnaire was carried out by the Observatory on Food Surplus, Recovery and Waste of CREA Food and Nutrition Centre. The aim of this work was to evaluate how Italian habits changed during this period, the determinants of changes, and the effect on food waste prevention. In a sample of 2678 respondents, 62% showed low Adherence to the Mediterranean Diet (AMD). During lockdown many of participants improved the quality of their diet, increasing their consumption of fruit (24.4%), vegetables (28.5%), legumes (22.1%), nuts (12%), and fish or shellfish (14%). Unfavorable changes were observed with the excessive consumption of sweets or pastries (36.9%) and comfort foods (22.7%), and a lack of physical activity (37.2%). The main novelty of this study was the examination of dietary changes identified by a cluster analysis. Respondents with generally high AMD improved their eating habits, while the habits of the respondents with generally low AMD remained unchanged. In addition, nearly 80% of respondents were sensitive to food waste. The study provides a useful contribution to the debate on nutritional recommendations in case of further lockdown.


Assuntos
COVID-19/prevenção & controle , Controle de Doenças Transmissíveis/métodos , Comportamento Alimentar , Estilo de Vida , Estado Nutricional , Adulto , Idoso , COVID-19/epidemiologia , Análise por Conglomerados , Estudos Transversais , Dieta Mediterrânea/estatística & dados numéricos , Exercício Físico , Feminino , Humanos , Itália/epidemiologia , Masculino , Pessoa de Meia-Idade , Pandemias/prevenção & controle , Eliminação de Resíduos/estatística & dados numéricos , SARS-CoV-2 , Inquéritos e Questionários , Verduras
8.
Sci Total Environ ; 784: 146950, 2021 Aug 25.
Artigo em Inglês | MEDLINE | ID: mdl-34088024

RESUMO

Aerobic composting is widely used on transforming organic solid waste into proliferating products. However, the removal of antibiotics and antibiotic resistance genes (ARGs) in the process of co-composting of food waste with sewage sludge has been rarely reported to date. Therefore, we investigated a laboratory-scale composting using food waste and sewage sludge as substrates to study changes in antibiotics and ARGs during composting. Varying dose of antibiotics were added to allow the evaluation of changes in antibiotics, the microbial community and ARGs. The results revealed that composting effectively removed fluoroquinolones and macrolides, while showed poor efficiency in removing sulfonamides. Results from the 16S rRNA sequencing revealed that Firmicutes dominated on D0, while Proteobacteria and Actinomycetes dominated on D28, and a high concentration of antibiotics affected the microbial succession. The quantitative PCR demonstrated that the abundance of sul3, sulA, qnrB, qnrS, and ermB was reduced after 28 days composting, while an increase in the abundance of sul1, sul2, qnrD, ermC, and ermF was induced by high concentrations of antibiotics. Redundancy analysis revealed that total organic matter was the most important factor for the variation in the ARGs abundance. Overall, our findings indicated that the aerobic co-composting of food waste with sewage sludge can effectively remove antibiotics and ARGs. Our study sheds a new idea light on the strategy for the removal of antibiotics and ARGs from organic solid waste.


Assuntos
Compostagem , Eliminação de Resíduos , Antibacterianos/farmacologia , Resistência Microbiana a Medicamentos/genética , Alimentos , Genes Bacterianos , RNA Ribossômico 16S/genética , Esgotos
9.
Sci Total Environ ; 783: 147077, 2021 Aug 20.
Artigo em Inglês | MEDLINE | ID: mdl-34088125

RESUMO

Animal-based food supply chains lead to significant environmental impacts, which can be influenced by production systems, distribution networks and consumption patterns. To develop strategy aimed at reducing the environmental impact of animal-based food supply chains, the common environmental hotspots among different types of food, the role of transport logistics and the consequence of end market need to be better understood. Life cycle assessment was adopted to model three types of animal-based food chains (beef, butter and salmon), with specific technologies, high spatial-resolution logistics and typical consumption patterns for three markets: local, regional (intra-European) and international. The results confirmed that the farm production stage usually had the greatest environmental impact, except when air transport was used for distribution. Potentially, the role of end market also can significantly influence the environmental impacts. To understand more, three improvement options were examined in detail with regard to hotspots for climate change: novel feed ingredients (farm production stage), sustainable aviation fuel (transport and logistics stage) and reduction of wasted food (consumption and end of life stage). Significant reduction was achieved in the salmon system by sustainable aviation fuel (64%) and novel feed (15%). Minimizing food waste drove the greatest reduction in the beef supply chain (23%) and the international butter supply chain can reduce 50% of GHG mission by adopting sustainable aviation fuel. Combined interventions could reduce GHG emission of animal-based food supply chains by 15% to 82%, depending on market, transport and food waste behaviour. The results show that eco-efficiency information of animal-based foods should include the full supply chain. The effective mitigation strategy to achieve the greatest reduction should not only consider the impacts on-farm, but also detail of the downstream impacts, such as food distribution network and consumption patterns.


Assuntos
Alimentos , Eliminação de Resíduos , Animais , Bovinos , Mudança Climática , Cadeia Alimentar , Abastecimento de Alimentos
10.
Nat Commun ; 12(1): 3248, 2021 05 31.
Artigo em Inglês | MEDLINE | ID: mdl-34059677

RESUMO

Water scarcity is rapidly spreading across the planet, threatening the population across the five continents and calling for global sustainable solutions. Water reclamation is the most ecological approach for supplying clean drinking water. However, current water purification technologies are seldom sustainable, due to high-energy consumption and negative environmental footprint. Here, we review the cutting-edge technologies based on protein nanofibrils as water purification agents and we highlight the benefits of this green, efficient and affordable solution to alleviate the global water crisis. We discuss the different protein nanofibrils agents available and analyze them in terms of performance, range of applicability and sustainability. We underline the unique opportunity of designing protein nanofibrils for efficient water purification starting from food waste, as well as cattle, agricultural or dairy industry byproducts, allowing simultaneous environmental, economic and social benefits and we present a case analysis, including a detailed life cycle assessment, to establish their sustainable footprint against other common natural-based adsorbents, anticipating a bright future for this water purification approach.


Assuntos
Conservação dos Recursos Hídricos , Nanofibras/química , Proteínas/química , Desenvolvimento Sustentável , Purificação da Água/métodos , Adsorção , Indústria de Laticínios , Interações Hidrofóbicas e Hidrofílicas , Eliminação de Resíduos/métodos , Poluentes da Água/química , Abastecimento de Água
11.
Waste Manag ; 130: 93-106, 2021 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-34062462

RESUMO

By means of source-segregation, organic waste streams are deterred from mass-burning and more sustainable treatment paths may be enabled. This study analyzed the environmental and economic performance of custom treatment paths for organic waste streams in Germany towards energy generation. The reference quantity was the production and export of 1 kWh of exergy, while treating a certain amount of waste. The methodologies of environmental life cycle assessment (eLCA) and levelized costs of exergy (LCOE) were applied. The considered treatment systems were (i) anaerobic digestion, (ii) hydrothermal carbonization (HTC) and (iii) incineration. The technologies were considered individually or in a cascade. The analyzed waste streams were the organic fraction of municipal solid waste (OFMSW), food waste and waste wood. For food waste and OFMSW, anaerobic digestion followed by the spreading of the digestate was characterized by overall beneficial environmental and economic properties. As the preferable treatment system was the same for both substrates, a separate collection of food waste was not considered worthwhile. For waste wood, the most environmentally friendly and economic option was direct incineration - either in a waste incinerator or in a lignite power plant. The implementation of an HTC process appeared viable for the treatment of OFMSW and food waste, both from an environmental and economic point of view. However, the energy intensive system must be outlined towards an environmentally friendly heat source. In this context, a cascading of anaerobic digestion with the HTC-process proofed to be an acceptable alternative.


Assuntos
Incineração , Eliminação de Resíduos , Anaerobiose , Animais , Alimentos , Alemanha , Estágios do Ciclo de Vida , Resíduos Sólidos/análise
12.
Waste Manag ; 130: 107-116, 2021 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-34077839

RESUMO

Food waste has attracted wide attention around the world. A better understanding of food waste generation and consumers' willingness to pay (WTP) for effective food waste management is important for addressing growing food waste challenges, but this is still largely missing in the literature, especially for developing countries and cities in Asia. In this study, we conducted field interviews and questionnaire surveys, with effective samples of 463 residents and 18 restaurants in Macau. Our results show that over 80% of respondents think food waste in Macau is serious. "Food exceeded expiration date (28.2%)" and "Ordering too much food (39.5%)" are the two main reasons for throwing away food at home and when eating out, respectively. Vegetables and fruits (22.4%) are the most common type of food wasted at home, followed by snacks (17.3%), in Macau. About 70% of respondents agreed to pay for separate food waste collection and treatment facilities, and the WTP value per household in Macau is 42.5 MOP (Macau Pataca)/month. Respondents' income level was positively and significantly correlated with their WTP, while age and educational level had negative effects on the WTP, under the 5% significance level. Some respondents' perceptions and attitudes on food waste also significantly affected their WTP, according to our analysis. Because of the lack of effective management measures and collection facilities, about 72% of surveyed restaurants mixed their food waste into municipal solid waste (MSW). More information sharing, education and promotion should be done to raise environmental protection awareness and improve the food waste treatment system.


Assuntos
Eliminação de Resíduos , Gerenciamento de Resíduos , Ásia , Atitude , Cidades , Alimentos , Macau , Restaurantes , Inquéritos e Questionários
13.
Waste Manag ; 130: 136-146, 2021 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-34087574

RESUMO

Improving the eco-efficiency of municipalities in the provision of municipal solid waste (MSW) services is fundamental in the context of a circular economy. This study evaluates the eco-efficiency of a sample of Spanish municipalities, integrating the total cost as input, recyclable waste as desirable output, and unsorted waste as undesirable output. Following a pioneering approach, the weighted Russell directional distance model (a non-radial data envelopment analysis model) was employed, which allowed us to obtain a global inefficiency score and individual inefficiency scores for each variable integrated in the model. In the second stage of analysis, the potential factors affecting the previously computed inefficiency scores were investigated. The results indicated that one third of the municipalities evaluated were eco-efficient in the provision of MSW services with the total cost being the variable in which the municipalities exhibited the best performance. Moreover, the size of the municipalities, population served, population density, tourism, and availability of containers for separative collection of paper, glass, and plastic significantly affect the eco-efficiency of the municipalities. The findings of this study provide detailed information to support decision-making for the policy makers to improve the eco-efficiency of the municipalities in managing MSW.


Assuntos
Eliminação de Resíduos , Gerenciamento de Resíduos , Cidades , Eficiência , Resíduos Sólidos/análise
14.
Waste Manag ; 130: 147-154, 2021 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-34090238

RESUMO

Management of Municipal solid waste in low-income countries with high population densities such as India has always been a strenuous task. With perpetual advancements, there are many available technologies dealing with waste management such as incineration, pyrolysis and landfill operations. But such technologies are often accompanied with some limitations (operational and maintenance problems) and have negative environmental impacts. In this regard, continuous efforts are currently spent to develop the sustainable technologies for coping with the problems of waste management. Confronted with such problems, BSF larval composting has emerged as a green approach for waste management which outshines the various current technologies. However, it is not widely explored and therefore in the present study, BSF larval treatment efficiency has been tested against different types of food waste treatments viz., mix food waste (T1), restaurant waste (T2), fruit waste (T3), and vegetable waste (T4). We have also evaluated the Biomass Conversion Ratio (BCR) of BSF larvae. The waste reduction efficiency was found to be 72% for T1 followed by T3 and T2 whereas the efficiency was least for T4 corresponding to lower BCR comparatively. BCR obtained for T1 treatment was almost 25% which was exceptionally high in comparison to other published studies. The highest waste reduction efficiency and the BCR values for T1 may be attributed to appropriately balanced food nutrition and C/N ratio Therefore, it may be concluded that substrate type and its nutritional value strongly determines the growth and development of larva influencing the waste ingestion rate.


Assuntos
Dípteros , Eliminação de Resíduos , Animais , Biomassa , Índia , Larva
15.
Waste Manag ; 130: 155-166, 2021 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-34090239

RESUMO

Black soldier fly (BSF) larval bioconversion can recycle nutrients in organic wastes into larval biomass and frass. While the frass has been commonly marketed as a soil amendment, its usefulness in soilless cultivation remains largely unexplored. Growth experiments were conducted to investigate the effectiveness of surplus food-derived and okara-derived BSF larval frass as an incorporated compost, side-dress fertilizer and frass-tea drench for the cultivation of pak choi and lettuce in waste-wood derived biochar growing media. Pak choi yields from treatments with surplus food-derived frass and biochar at a 10:90 (v/v) ratio and inorganic fertilizer were comparable to those of the control which consisted of soil, peat-based compost and inorganic fertilizer. However, yields decreased with increasing frass incorporation rates owing to high salinity and potentially low oxygen conditions in the growing media. When used as a fertilizer on biochar-coir growing media, the direct application of frass as a side-dress fertilizer was 1.6-6.8 times more effective in promoting lettuce growth than the application as a frass-tea drench. Frass fertilizers derived from surplus food outperformed those derived from okara by 1.3-5.3 times. Lettuce yields were not significantly different between the treatment with surplus food-derived frass applied as a side-dress fertilizer and the control of liquid inorganic fertilizer. Variations in fertilizing potential were attributed to nutrient availability and the presence of plant growth promoting microbes in the growing media. BSF larval frass derived from food waste shows promise in partially replacing unsustainable agricultural inputs for leafy vegetable cultivation, including soil and inorganic fertilizers.


Assuntos
Compostagem , Dípteros , Eliminação de Resíduos , Animais , Carvão Vegetal , Fertilizantes , Larva , Solo , Chá , Verduras
16.
Environ Monit Assess ; 193(7): 442, 2021 Jun 24.
Artigo em Inglês | MEDLINE | ID: mdl-34165638

RESUMO

The amount of solid waste produced across the planet in the past decade was 1.3 billion tons (1.2 kg/year per person). Also, the significant number of publications on solid waste management (SWM) draws attention to the importance of discussing the topic to improve public health and to mitigate environmental impacts. The objectives of this article are to identify the state of the art and the scientific gaps on SWM and to propose a framework to promote it in the coming years. For this, a content analysis was carried out with the support of a bibliometric study, considering articles published in the Scopus database. The field of SWM study was classified into 12 different themes, and from this division, it was sought to identify the evolution of each of them between the 2005 and 2018 period. Content analysis and bibliometric study indicate that thermal and biological treatments are a promising trend to improve the performance of SWM. Its most important applied contribution is the generation of qualified information about SWM that can support the decision-making of public and private managers to reduce environmental impacts and improve life in urban spaces. The main academic contribution of the paper is the articulation of the most important themes on SWM, identifying the individual impact of each one of them in this field of study and the indication of the scientific trends that should guide the development of future research.


Assuntos
Eliminação de Resíduos , Gerenciamento de Resíduos , Monitoramento Ambiental , Humanos , Resíduos Sólidos/análise
17.
Water Sci Technol ; 83(12): 2963-2979, 2021 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-34185692

RESUMO

This study aims to assess the transportability of food waste disposer particles within a sewer system. A series of laboratory studies has examined the physical characteristics of solid particles derived from domestic food waste disposers. Particle size distributions and maximum settling velocity characteristics were measured for 18 common food types, and stored in a publicly accessible database. Particle size distributions are shown to fit well with a 2-parameter Gamma distribution. Settling velocity is generally higher for larger particles, except when particle density and sphericity change. For most food types, particle specific gravity was close to unity. Egg shell particles had a significantly higher specific gravity. This information, combined with the particle size data have been used to show that there is a very low likelihood of food waste particle deposition in sewers during normal operational flows, other than temporary transient deposits of egg shell particles.


Assuntos
Eliminação de Resíduos , Esgotos , Alimentos , Tamanho da Partícula
18.
Ecotoxicol Environ Saf ; 220: 112381, 2021 Sep 01.
Artigo em Inglês | MEDLINE | ID: mdl-34091184

RESUMO

Developing monolithic carbon-based catalyst with low cost, easy separation and high performance to degrade pollutants via PMS activation is crucial. In this work, a series of novel monolithic Me-CA catalysts based on biomass derived carbon aerogel were prepared by hydrothermal method using waste watermelon peel as raw material. Co-CA catalyst showed excellent performance to activate PMS for 2, 4-DCP degradation in different temperature and different water matrices. Different pollutants, such as ciprofloxacin (CIP), bisphenol A (BPA), and 2, 4-dichlorophenoxyacetic acid (2, 4-D) could also be removed in the Co-CA/PMS system. As expected, Co-CA could be easily separated from degraded solution, and show high stability and reusability for PMS activation with a lower cobalt leaching. Based on the results of the quenching tests, electron paramagnetic resonance (EPR) spectra, Chronoamperometric test (i-t curves) and electro-chemical impedance spectroscopy (EIS), the PMS activation mechanism was proposed. The phytotoxicity assessment determined by germination situation of mung bean indicated that PMS activation could eliminate the hazards of 2, 4-D. Therefore, this study provides a low cost, efficient and environmental-friendly monolithic biomass carbon aerogel catalyst for different pollutants degradation, which further advances monolithic catalyst for practical wastewater treatment.


Assuntos
Carbono/química , Cobalto/química , Recuperação e Remediação Ambiental/métodos , Peróxidos/química , Ácido 2,4-Diclorofenoxiacético/química , Ácido 2,4-Diclorofenoxiacético/toxicidade , Biomassa , Catálise , Poluentes Ambientais/química , Poluentes Ambientais/toxicidade , Eliminação de Resíduos , Vigna/efeitos dos fármacos
19.
Artigo em Inglês | MEDLINE | ID: mdl-34066262

RESUMO

Food waste and loss is a global issue involving ethics, society, the environment, and the economy. However, there is a lack of systematic and visual scientific knowledge and graph methods to study the precedents of this field's development over time. The article is based on the scientific knowledge graph research of articles published in the past 22 years to review the latest food waste research developments. The study will be conducted from the following perspectives: country/region, institution, author, journal, keyword co-occurrence, and article co-citation. It turns out that in the past eight years, food waste research has grown rapidly. A total of 8298 research articles have been published in 8064 journals and 176 Web of Science (WOS) subject categories. Research shows in the past 20 years. The main research hotspots were anaerobic digestion, biogas production, composting, biological hydrogen production, and innovation in system management methods. In the future, efficient and multitask biological value-added conversion technology, systematization of food-supply-chain decision-making aid models, and research on differences in management strategies may become the frontiers of research.


Assuntos
Alimentos , Eliminação de Resíduos , Bibliometria , Biocombustíveis , Publicações
20.
J Environ Manage ; 294: 112959, 2021 Sep 15.
Artigo em Inglês | MEDLINE | ID: mdl-34116308

RESUMO

This study highlights the potential of pyrolysis of food waste (FW) with Ni-based catalysts under CO2 atmosphere as an environmentally benign disposal technique. FW was pyrolyzed with homo-type Ni/Al2O3 (Ni-HO) or eggshell-type Ni/Al2O3 (Ni-EG) catalysts under flowing CO2 (50 mL/min) at temperatures from 500 to 700 °C for 1 h. A higher gas yield (42.05 wt%) and a lower condensable yield (36.28 wt%) were achieved for catalytic pyrolysis with Ni-EG than with Ni-HO (34.94 wt% and 40.06 wt%, respectively). In particular, the maximum volumetric content of H2 (21.48%) and CO (28.43%) and the lowest content of C2-C4 (19.22%) were obtained using the Ni-EG. The formation of cyclic species (e.g., benzene derivatives) in bio-oil was also effectively suppressed (24.87%) when the Ni-EG catalyst and CO2 medium were concurrently utilized for the FW pyrolysis. Accordingly, the simultaneous use of the Ni-EG catalyst and CO2 contributed to altering the carbon distribution of the pyrolytic products from condensable species to value-added gaseous products by facilitating ring-opening reactions and free radical mechanisms. This study should suggest that CO2-assisted catalytic pyrolysis over the Ni-EG catalyst would be an eco-friendly and sustainable strategy for disposal of FW which also provides a clean and high-quality source of energy.


Assuntos
Pirólise , Eliminação de Resíduos , Animais , Dióxido de Carbono , Casca de Ovo , Temperatura
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...