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1.
Bioresour Technol ; 308: 123250, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32244132

RESUMO

This work investigated the effect of biochar addition to mitigate VFA accumulation and enhance methane production in mesophilic food waste/sludge co-digestion. Different types of biochar derived from agricultural and forestry residues at two pyrolysis temperatures were tested. Results showed that wheat straw biochar 550 °C supported the highest specific methane yield of 381.9 LCH4/kg VSadded and VS removal efficiency of 41.62% among all treatments. Degradation of propionic acid and long-chain fatty acids such as valeric, caproic and isovaleric acids was observed. This also corresponded to an increase in methanogenic favorable substrates including acetic acid (>40%) and butyric acid (~20%) over the control. Consequently, a 24% increase in overall methane production was obtained as compared to control. This demonstrated that biochar addition had positive effects on VFA degradation and methane production which could be a useful strategy to increase the organic loading in co-digestions without the fear of process failure.


Assuntos
Eliminação de Resíduos , Esgotos , Anaerobiose , Reatores Biológicos , Carvão Vegetal , Ácidos Graxos Voláteis , Alimentos , Metano
3.
Salud Publica Mex ; 62(2): 166-180, 2020.
Artigo em Espanhol | MEDLINE | ID: mdl-32237559

RESUMO

OBJECTIVE: To identifiy the energy contribution (EC) of the food consumed in those older than five years and by sociodemographic characteristics in Mexican population. MATERIALS AND METHODS: We analyzed data from 24-hour recalls from 7 983 subjects ≥5 years included in the Encuesta Nacional de Salud y Nutrición 2012 (Ensanut 2012). The EC to total daily energy intake of 50 foods allocated to eight food groups at national level and stratified by age, area of residence, region and socioeconomic level was estimated. RESULTS: Seven foods contributed 50% of total energy intake: tortilla and corn products (20.6%), sweet bread (6.6%), vegetable oils (4.9%), white bread and wheat products (4.9%), carbonated sugary drinks (4.6%), red meat (4.0%) and whole milk (4.0%). Other foods, which its consumption is recommended to increase due to its positive effects on health, showed minor contributions (less than 1.0%), with the exception of beans (3.3%). Great heterogeneity in intakes was observed between subgroups of the population. CONCLUSIONS: The identification of individual foods and their EC for both, food groups whose consumption should be increased as well as those that should be reduced can be useful for the design of regulatory actions and educational strategies aimed at reducing the diet related burden of disease.


Assuntos
Ingestão de Energia , Alimentos , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Criança , Pré-Escolar , Humanos , México , Pessoa de Meia-Idade , Adulto Jovem
4.
Bioresour Technol ; 307: 123256, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32247275

RESUMO

This study investigated whether bioaugmentation can improve the anaerobic digestion (AD) performance of food waste (FW), as well as the effects of addition dosage and frequency on the bioaugmentation's performance and economic feasibility. The findings demonstrated that all the bioaugmented digesters, regardless of dosage and frequency, performed more effectively in biogas production than the non-bioaugmentation control. Furthermore, relatively higher dosages or frequencies increased AD performance. Introducing 0.25 g L-1 d-1 of bioaugmentation seed every three days increased OLR and volumetric biogas production 8-fold and 12-fold, respectively, compared to the non-bioaugmentation control. Whole-genome sequencing analysis showed that bioaugmentation enhanced the population of the acetoclastic Methanothrix (belong to the order Methanosarcinales). Moreover, high abundance of Methanothrix (exceeding 80%) contributed to a better AD performance. Economic analysis of an up-scale biogas plant suggested that an appropriate bioaugmentation process increased income, thus increasing the profit to 3696 CNY d-1 if treated at 21 t FW.


Assuntos
Metano , Eliminação de Resíduos , Anaerobiose , Biocombustíveis , Reatores Biológicos , Alimentos
5.
J Environ Manage ; 265: 110548, 2020 Jul 01.
Artigo em Inglês | MEDLINE | ID: mdl-32292172

RESUMO

Nitrous oxide (N2O) is a greenhouse gas (GHG) and an ozone-depleting substance. Municipal solid waste (MSW) management and treatment activities are some of the sources of GHG emissions. However, the biogenic GHG emissions during the predisposal stage of MSW management, during which waste is transferred to garbage cans and then transported to disposal sites, have received little attention. In this study, household waste was divided into food and non-food waste, and the effects of these types of waste and different oxygen concentrations (21%, 10%, and 1%) on N2O emissions were investigated. A15N-labeled isotope experiment was conducted over three days to determine the contributions of nitrification and denitrification to N2O emissions. The results showed that the N2O fluxes first increased and then decreased during the three-day tests at different O2 concentrations. The maximum N2O flux of 1469.59 ± 1004.32 µg N·kg-1 wet waste·h-1 occurred during the predisposal of food waste at an O2 concentration of 21%, with the total N2O emissions reaching 20.26 ± 10.87 mg N·kg-1 wet waste, which exceeds the emissions from some waste disposal processes, such as composting and landfills. The N2O emissions decreased in the following order: food waste > household waste > non-food waste. For food waste, the peak value and total amount of N2O emissions decreased significantly as the O2 concentration decreased. In contrast, the N2O emissions from non-food waste increased as the O2 concentration decreased. Denitrification was the predominant biogenic source of N2O emissions; it accounted for over 60% of N2O production in all treatments. Nitrification also played an important role in N2O emissions during the early predisposal stage.


Assuntos
Eliminação de Resíduos , Alimentos , Metano , Óxido Nitroso , Resíduos Sólidos , Instalações de Eliminação de Resíduos
6.
Waste Manag ; 107: 91-100, 2020 Apr 15.
Artigo em Inglês | MEDLINE | ID: mdl-32278220

RESUMO

This research investigated the roles of zero-valent iron (ZVI) in a two-stage food waste digestion process. ZVI was added separately to hydrolytic-acidogenic (HA) and methanogenic (MG) stages to understand its impacts on FW hydrolysis-acidification, methanogenesis and bioenergy recovery efficiency. Results showed that ZVI effectively enhanced the overall performance of digestion as compared with the controls without ZVI. Supplementing with ZVI could facilitate the HA process along with faster hydrogen generation. In addition, ZVI shortened the lag phase of MG stage by 42.43-57.23% and raised the maximum methane production rate and yield by 33.99-38.20% and 11-13%, respectively, compared with the controls. Supplementing ZVI to the HA stage could simultaneously raise the bioenergy recovery efficiency of the HA and MG stages by 71.92% and 96.96%, respectively. Further studies demonstrated that iron corrosion contributed little to hydrogen and methane production. The enrichment of syntrophic bacteria, Pseudomonas, and methanogens, and the enhancement of electron transfer among those microbes was supposed to be the main possible mechanism for the enhancement of methanogenesis with ZVI assisted.


Assuntos
Ferro , Eliminação de Resíduos , Anaerobiose , Reatores Biológicos , Alimentos , Metano , Esgotos , Eliminação de Resíduos Líquidos
7.
Waste Manag ; 107: 150-158, 2020 Apr 15.
Artigo em Inglês | MEDLINE | ID: mdl-32283489

RESUMO

Converting food waste into butanol via acetone, butanol, and ethanol (ABE) fermentation provides the potential to recover energy and value-added chemicals from food waste. However, the high variability of food waste compositions has hindered the consistency and predictability of butanol production, impeding the development of a robust industrial fermentation process. This study characterized the compositional variation of collected food wastes and determined correlations between food waste compositional attributes and butanol yields for a better prediction of food waste fermentation with Clostridium. The total sugar, starch, fiber, crude protein, fat and ash contents (on dry basis) in the food waste samples were in a range of 0.5-53.5%, 0-25.2%, 0.6-26.9%, 5.5-21.5%, 0.1-37.9%, and 1.4-13.7%, respectively. The high variability of food waste composition resulted in a wide range (3.5-11.5 g/L) of butanol concentrations with an average of 8.2 g/L. Pearson's correlation analysis revealed that the butanol concentrations were strongly and positively correlated with equivalent glucose and starch contents in food waste, strongly and negatively correlated with fiber content, and weakly correlated with total sugar, protein, fat, and ash contents. The regression models constructed based on equivalent glucose and fiber contents reasonably predicted the butanol concentration, with the R2 of 0.80. Our study investigated the variability of food waste composition and, for the first time, unveiled relationships between food waste compositional attributes and fermentation yields, contributing to a greater understanding of food waste fermentation, which, in turn, assists in developing new strategies for increased consistency and predictability of food waste fermentation.


Assuntos
Acetona , Eliminação de Resíduos , Butanóis , Etanol , Fermentação , Alimentos
8.
Waste Manag ; 107: 211-218, 2020 Apr 15.
Artigo em Inglês | MEDLINE | ID: mdl-32305778

RESUMO

The anaerobic digestion of food waste, can result in large amounts of solid waste digestate, often without methods of disposal. In this study, a biochar was prepared from food waste digestate (FWD) by pyrolysis, and its potential to activate peroxymonosulfate (PMS) for the removal of pollutants from a simulated textile wastewater was evaluated. The results showed that the addition of biochar (0.5 g/L) and PMS (1 mM) to wastewater could remove >99% of a representative azo dye pollutant (reactive brilliant red X-3B, 1 g/L) within 10 min. The efficiency of this removal process was attributed to the catalytic sites in the biochar (graphitic carbon and nitrogen, pyridinium nitrogen and CO structures) which could activate PMS to produce reactive oxygen species (1O2, O2-, OH and SO4-). The results obtained in this study confirmed the activation potential of the biochar derived from FWD on PMS, providing an alternative utilization strategy for anaerobic FWD.


Assuntos
Poluentes Ambientais , Eliminação de Resíduos , Carvão Vegetal , Alimentos , Peróxidos , Águas Residuárias
9.
Waste Manag ; 107: 266-275, 2020 Apr 15.
Artigo em Inglês | MEDLINE | ID: mdl-32320939

RESUMO

Recent works have found a negative correlation between the amount of food waste generated in foodservice outlets and the extent to which managers perceive it as a relevant problem. However, it is hard to believe that food flows would be impacted by wishful thinking alone. In this paper, we try to offer an explanation to these findings by testing the associations between importance recognition, food waste measurement and compliance to waste reduction strategies in three different stages (pre-kitchen, in-kitchen and post-kitchen). We do so by fitting a generalized structural equation model in the results of a survey ran in Italy with almost 500 Horeca (Hotels, restaurants and cafeterias) managers. Our findings reveal that importance perception triggers strategies' adoption in only one of the three stages (in-kitchen). Furthermore, this association is essentially dependent on the mediation performed by measurement, suggesting that importance recognition covers a complex pathway to arrive in reduced amounts of waste. Additional results indicate that larger and higher-end outlets tend to place more importance on food waste. Moreover, although 77% of the sample recognizes the relevance of food waste to their businesses, the incorporation of some of the main reduction strategies is still low, as 85% of the establishments report the adoption of no more than 3 out of the 9 strategies presented.


Assuntos
Eliminação de Resíduos , Gerenciamento de Resíduos , Alimentos , Itália , Restaurantes
10.
N Z Med J ; 133(1511): 71-85, 2020 03 13.
Artigo em Inglês | MEDLINE | ID: mdl-32161423

RESUMO

The hazardous and obesogenic food environment are major contributors to health loss in Aotearoa New Zealand. Here we consider the potential use of food taxes and subsidies to protect health in this country. We find that each one of the 14 recent systematic reviews on the tax and/or subsidy topic since 2015 in the scientific literature report that such interventions have favourable impacts from a health perspective. The New Zealand evidence we considered (n=12 studies since January 2010) is less definitive, but the pattern of results is consistent with the international evidence. Given this overall picture, the New Zealand Government should seriously consider such tax/subsidy interventions, potentially starting with a UK-style sugary drinks industry levy.


Assuntos
Alimentos , Legislação sobre Alimentos , Saúde Pública , Bebidas Adoçadas com Açúcar , Impostos/legislação & jurisprudência , Bebidas , Gorduras na Dieta , Açúcares da Dieta , Humanos , Nova Zelândia , Grupo com Ancestrais Oceânicos , Sódio na Dieta
11.
Chem Biol Interact ; 323: 109030, 2020 May 25.
Artigo em Inglês | MEDLINE | ID: mdl-32205154

RESUMO

The review summarizes literature data on the DNA-binding, DNA-protecting and DNA-damaging activities of a range of natural human endogenous and exogenous compounds. Small natural organic molecules bind DNA in a site-specific mode, by arranging tight touch with the structure of the major and minor grooves, as well as individual bases in the local duplex DNA. Polyphenols are the best-studied exogenous compounds from this point of view. Many of them demonstrate hormetic effects, producing both beneficial and damaging effects. An attempt to establish the dependence of DNA damage or DNA protection on the concentration of the compound turned out to be successful for some polyphenols, daidzein, genistein and resveratrol, which were DNA protecting in low concentrations and DNA damaging in high concentrations. There was no evident dependence on concentration for quercetin and kaempferol. Probably, the DNA-protecting effect is associated with the affinity to DNA. Caffeine and theophylline are DNA binders; at the same time, they favor DNA repair. Although most alkaloids damage DNA, berberine can protect DNA against damage. Among the endogenous compounds, hormones belonging to the amine class, thyroid and steroid hormones appear to bind DNA and produce some DNA damage. Thus, natural compounds continue to reveal beneficial or adverse effects on genome integrity and provide a promising source of therapeutic activities.


Assuntos
Produtos Biológicos/metabolismo , Reparo do DNA , DNA/metabolismo , Alimentos , Compostos Orgânicos/metabolismo , Produtos Biológicos/química , Hormônios/metabolismo , Compostos Orgânicos/química
12.
Sci Total Environ ; 719: 137307, 2020 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-32143094

RESUMO

Food insecurity affects Inuit communities. One solution is to consume locally harvested foods, named country foods. However, some country foods are not eaten as often as before, and pressures including contaminants and environmental changes threaten the health of Arctic fauna, thus its suitability for local consumption. By combining Inuit Knowledge with laboratory data, our study assessed the benefits and risks of walrus consumption by Inuit in Nunavik, Québec, Canada. It aimed to increase understanding of: 1) the hunt of healthy Atlantic walruses (Odobenus rosmarus rosmarus); 2) the safe preparation of walruses; 3) the nutritional benefits and risks of consuming walruses. To do so, we interviewed 34 hunters and Elders from Nunavik. Levels of mercury, omega-3 polyunsaturated fatty acids and selenium were evaluated from locally harvested walruses. Through the Nunavik Trichinellosis Prevention Program, a total of 755 Atlantic walrus samples, collected between 1994 and 2013, were tested for Trichinella nativa. Information on botulism was reviewed. While interviews informed on how to select healthy walruses and prepare them for consumption, laboratory analyses revealed that walruses had elevated levels of omega-3 fatty acids and selenium but low levels of mercury compared to some other wildlife. Only 3% of the 755 walruses were infected with T. nativa. Most walruses' infections were found within individuals from the South East Hudson Bay stock, where Inuit have thus decided to stop hunting since mid-2000s. Finally, although the number of outbreaks of trichinellosis related to the consumption of walruses has significantly reduced in Nunavik, botulism could continue to be an issue when igunaq (i.e. aged walrus) is not properly prepared. With the support of the Nunavik Trichinellosis Prevention Program and transmission of Inuit knowledge on igunaq preparation, the consumption of Atlantic walruses has the potential to help address issues related to food insecurity in Nunavik in the future.


Assuntos
Morsas , Envelhecimento , Animais , Regiões Árticas , Alimentos , Quebeque , Medição de Risco
13.
J Environ Manage ; 264: 110455, 2020 Jun 15.
Artigo em Inglês | MEDLINE | ID: mdl-32217328

RESUMO

Due to the climate change and increased attention toward environmental management issues, the agri-food sector has been extensively relying on research, development, and innovation (RDi) to transform conventional agricultural production into a sustainable and eco-friendly industry. While the academic contribution of research has been relatively easily identified in the literature, the assessment of its societal impact remains underdeveloped. Accordingly, this study employs mixed-method evaluation approaches, mainly ASIRPA framework and Impact Oriented Monitoring (IOM) model to better understand and measure the multi-dimensional impacts of RDi in the agri-food sector in Spain. The objective of this analysis is to identify the impact of research on the society and the ecosystem. An in-depth case study analysis is conducted to examine the "best practices" program to promote sustainable techniques in the rice cultivation. Empirical findings suggest a standardized index to measure the economic, socio-territorial, health, political, capacity building, and environmental impacts, involving the stakeholder-network evaluation. The study highlights important implications for firm management decisions monitoring research uptake and policy design in the agri-food sector.


Assuntos
Agricultura , Ecossistema , Mudança Climática , Alimentos , Espanha
14.
Waste Manag ; 106: 12-20, 2020 Apr 01.
Artigo em Inglês | MEDLINE | ID: mdl-32179417

RESUMO

Impurities in biowaste, such as plastics, glass, metals and inert material, negatively impact the operation of anaerobic digestion plants and compost quality, and have to be removed prior to the anaerobic digestion process. Different mechanical pretreatments are available for this purpose. However, data on the removal efficiencies of pretreatment systems for different types of biowaste and for different kinds of impurities are still scarce. This study aims to determine the efficiencies for impurity removal of four biowaste pretreatment plants (BTPs) at real scale - (1) drum-screen + shredder + piston press; (2) shredder + piston press + screw press; (3) separation-mill; and (4) pulper + drum-screen. BTP 1 treats mixed food and garden wastes, while BTP 2, 3 and 4 treat mostly food waste. The efficiency of the pretreatment systems was influenced by the type of pretreated biowaste. The recovery of organics by the press was more efficient when pretreating food waste (BTP 2, 93%) than for treating mixed food and garden wastes (BTP 1, 77%). BTP 3 presented the highest recovery of biogas (up to 98%), but also the highest transfer of inert particles to the substrate. On the contrary, BTP 4 was the most efficient for the removal of inert particles; however, this system also presented 18% loss of biogas potential.


Assuntos
Eliminação de Resíduos , Anaerobiose , Biocombustíveis , Alimentos
15.
Water Res ; 175: 115693, 2020 May 15.
Artigo em Inglês | MEDLINE | ID: mdl-32203817

RESUMO

The difficulty of dissolved methane recovery remains a major hurdle for mainstream anaerobic wastewater treatment processes. We recently proposed solvent-based membrane contactor (SMC) for high (>90%) methane recovery over a wide temperature range and net-energy production. Here, we investigate the methane recovery efficacy of the SMC process by using an AnMBR effluent from treating food waste leachate. We observed almost identical methane transfer kinetics to the process employing foulant-free methane-saturated feed solutions, with >92% methane recoveries, showing that organic foulants have insignificant impacts on the methane transport in the SMC. We then performed two different membrane contactor experiments: direct-contact membrane-distillation (DCMD, with transmembrane water vapor flow) and SMC (no water vapor flow). From the negligible fouling observed in the SMC experiment, opposite to the DCMD, we elucidate that the absence of water vapor flow renders the SMC process intrinsically robust to membrane fouling. With the low fouling propensity of the SMC process under highly fouling environments, our study highlights the feasibility of SMC processes to enhance the energy production in mainstream anaerobic wastewater treatment processes.


Assuntos
Metano , Eliminação de Resíduos , Anaerobiose , Reatores Biológicos , Alimentos , Membranas Artificiais , Solventes , Eliminação de Resíduos Líquidos , Águas Residuárias
16.
Bioresour Technol ; 307: 123195, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-32217437

RESUMO

Food waste (FW) and cow manure (CM) were co-digested to achieve a stable and high-rate of methane production. The start-up conditions (substrate mixing (FW/CM) ratio, substrate to inoculum ratio, and initial pH) were optimised, and the optimised parameters were experimentally confirmed by batch operation under mesophilic temperatures. To further verify the effects of start-up conditions on the long-term co-digestion process, a semi-continuous dynamic membrane bioreactor was operated for over 300 days with an FW/CM ratio of 2.5. Following the optimised operation scheme, the organic loading rate gradually increased to 11.9 g COD/L/d. Thus, stable anaerobic co-digestion was maintained at FW/CM ratio of 2.5, and a high CH4 production of 2.71 L CH4/L/d and CH4 yield of 441 mL CH4/g VS was achieved. In the long-term operation, the digestate pH was stable at approximately 8.4, which indicated a very favourable anaerobic reaction condition without volatile fatty acid accumulation.


Assuntos
Esterco , Eliminação de Resíduos , Anaerobiose , Animais , Biocombustíveis , Reatores Biológicos , Bovinos , Feminino , Alimentos , Metano
17.
Water Res ; 174: 115616, 2020 May 01.
Artigo em Inglês | MEDLINE | ID: mdl-32145553

RESUMO

Emission of sulfide and methane from sewerage system has been a major concern for a long time. Sewers are now facing emerging challenges, such as receiving food waste (FW) to relieve the burdens on solid waste treatment. However, the knowledge of the direct impact of FW addition on sulfide and methane production in and emission from sewers is still lacking. In this study, two lab-scale sewer reactors, one without and one with FW addition, were continuously operated to investigate the production of sulfide and methane and microbial communities arising from FW discharge to freshwater sewerage system. The 190-day long-term monitoring and the batch tests on days 69 and 124 suggest that the FW addition has little impact on sulfide production possibly due to the limited sulfate concentration (40 mg S/L) but enhanced methane production by up to 60%. Moreover, cryosection-fluorescence in situ hybridization (FISH) revealed that the FW addition significantly stimulated the accumulation of methanogenic archaea (MA) in sewer biofilms and altered the spatial distributions of sulfate-reducing bacteria (SRB) and MA. Moreover, the relative abundance of MA in biofilms with FW addition was higher than that without FW addition, whereas the relative abundance of SRB was similar. Metabolic pathway analysis for sulfidogenesis and methanogenesis indicates that sufficient substrates derived from the FW addition were biodegraded during fermentation to produce acetate and hydrogen, and consequently facilitate methanogenesis. These findings shed light on the impacts of changes in wastewater compositions (e.g., FW addition) on sulfide and methane production in the freshwater sewerage system for improved policy-making on sewer management.


Assuntos
Metano , Eliminação de Resíduos , Alimentos , Hibridização in Situ Fluorescente , Esgotos
18.
Ultrasonics ; 103: 106095, 2020 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-32044566

RESUMO

We measured the apparent reflection coefficient of a 1-MHz ultrasound compressional wave at the interface between rough and lubricated tongue mimicking surfaces and various food gels, composed of agar or gelatin. For the smoothest mimicking surface, when a lubricating layer was present, the apparent reflection coefficient was fairly similar for the different food gels (33.6% on average). The apparent reflection coefficient was significantly larger in the following situations: (i) tongue asperities were high and dense; (ii) lubrication levels were low; and (iii) gels were less rigid (range for the different gels-45.9-84.3%). The apparent reflection coefficient conveys the ability of food gels to mold themselves to surface asperities or to form a coupling film of liquid at the interface. This study demonstrates that ultrasound methods can and should be used to explore the physical phenomena that underlie the texture perceptions resulting from tongue-palate interactions.


Assuntos
Alimentos , Língua/diagnóstico por imagem , Ultrassonografia/métodos , Ágar , Módulo de Elasticidade , Gelatina , Géis , Técnicas In Vitro , Lubrificação , Propriedades de Superfície
19.
Anim Cogn ; 23(2): 415-425, 2020 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-32030537

RESUMO

The string-pulling paradigm has been adapted to investigate many psychological phenomena across a range of animal species. Although varying string length has been shown to influence performance, the nature of the representation remains to be determined. Across three experiments, rats were shaped to pull string to receive food reinforcement. Either string length or reinforcement rate was manipulated to examine the influence on string-pulling behavior. Experiment 1 demonstrated that varied string length was sufficient to elicit an odor discrimination. Subsequent experiments provided evidence that varying string length (Experiment 2) and reinforcement rate (Experiment 3) produced qualitatively distinct patterns of string-pulling behavior. In Experiment 2 rats that received a long string were more likely to pull in the probe string to the end, yet no differences were observed in approach time between short and long groups. However, in Experiment 3 rats that received low reinforcement were less likely to pull in the probe string to the end and were slower to approach the string to begin pulling. These results are consistent with rats using temporal and motivational characteristics to guide responding during string-pulling behavior.


Assuntos
Resolução de Problemas , Reforço Psicológico , Animais , Alimentos , Motivação , Ratos
20.
Bioresour Technol ; 304: 122980, 2020 May.
Artigo em Inglês | MEDLINE | ID: mdl-32062392

RESUMO

This study explores individual contributions and synergistic effects of food and paper, main components of organic fraction of municipal solid waste (OFMSW) towards volatile fatty acids (VFA) fermentation under different temperatures (25, 37, 42 and 52 °C). Thanks to the synergism of food and paper component (FC & PC), the results revealed that OFMSW is suitable for VFA production. Maximum VFA production was noticed to be 21.5 mg/L at 42 °C, ~2.1, and 1.42 times higher than fermentation of PC and FC. Enhanced hydrolysis of PC occurred at >37 °C, increasing alkalinity in leachate to 6.7 g/L at 42 °C, thus maintaining a stable pH (5.4-5.6) during acidogenic fermentation. Additionally, 74% of COD is hydrolyzed, of which 79% is converted to VFA based on biodegradable carbon at 42 °C. It is suggested that co-existence of FC and PC can enhance VFA production of OFMSW, and targeted VFA production can be maximized through process optimization.


Assuntos
Ácidos Graxos Voláteis , Resíduos Sólidos , Reatores Biológicos , Fermentação , Alimentos , Concentração de Íons de Hidrogênio , Temperatura
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