Anaerobic digestion for bioenergy production: Global status, environmental and techno-economic implications, and government policies

Vasco‐Correa, Juliana; Khanal, Sami; Manandhar, Ashish; Shah, Ajay

doi:10.1016/j.biortech.2017.09.004

Cited by 271 publications

(113 citation statements)

References 98 publications

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“…Through the years, many tools have been used. However, the most suitable and powerful tool for determining environmental, and even economic and social impact of waste management is Life Cycle Assessment (LCA) [265]. LCA enables comparing and quantifying the impacts of different waste solutions, acting as a support tool for decision making in waste management.…”

Section: Environmental Impacts Of Anaerobic Digestion Of Fw With Sewamentioning

confidence: 99%

Reviewing the Anaerobic Digestion of Food Waste: From Waste Generation and Anaerobic Process to Its Perspectives

2018

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Discharge of waste in general, and food waste, in particular, is considered one of the major environmental problems today, as waste generation increases continuously, reaching values of 32% of all food produced worldwide. There are many different options that can be applied to the management and evaluation of waste treatment, and Anaerobic Digestion seems to be one of the most suitable solutions because of its benefits, including renewable energy generation in form of biogas. Moreover, if FW (food waste) is digested in anaerobic digesters from Waste Water Treatment Plants, a common solution is provided for both residues. Furthermore, co-digestion of food waste and sewage sludge provides benefits in terms of anaerobic process stability enhancing the buffer capacity of ammonia (for example) and biogas formation, which can be increased up to 80% when compared with monodigestion. The present paper reviews food waste anaerobic digestion from its generation, characteristics and different options for its management, and it does focus specifically on the anaerobic digestion and co-digestion process, stages, limiting rates and parameters, utilizing numerous experiences, strictly related to food waste. Pre-treatments are also considered as they are important and innovative for enhancing biogas production and its methane yield. The paper shows an extensive collection of pre-treatments, its basics, improving factors, and numerical data of biogas formation improvements that are related both to substrate modification and to the synergistic effect of co-digestion, which could lead to an increase of methane production from 11% to 180%.

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Section: Environmental Impacts Of Anaerobic Digestion Of Fw With Sewamentioning

confidence: 99%

Reviewing the Anaerobic Digestion of Food Waste: From Waste Generation and Anaerobic Process to Its Perspectives

2018

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“…AD is a complex process which requires strict anaerobic conditions to proceed, and depends on the coordinated activity of a complex microbial association to transform organic material into CO 2 and CH 4 . AD of sludge has long been used to achieve sludge stabilization and reduction, recovering CH 4 as clean energy, which can be burned for heat, steam and electricity in a combined heat and power unit . Therefore, considering the easy operability, low cost and resource production, AD processes are proposed as a promising strategy for sludge valorization, which not only solves the sludge treatment problem, but also generate VFAs and CH 4 as carbon resources to realize resource recovery .…”

Section: Strategies Of Sludge Valorizationmentioning

confidence: 99%

“…AD of sludge has long been used to achieve sludge stabilization and reduction, recovering CH 4 as clean energy, which can be burned for heat, steam and electricity in a combined heat and power unit. 42 Therefore, considering the easy operability, low cost and resource production, AD processes are proposed as a promising strategy for sludge valorization, which not only solves the sludge treatment problem, but also generate VFAs and CH 4 as carbon resources to realize resource recovery. 31 However, hydrolysis of sludge is regarded as the limiting step of the AD process because organic matter has a relatively large molecular weight and cannot be used by bacteria directly.…”

Section: Introductionmentioning

confidence: 99%

Strategies of valorization of sludge from wastewater treatment

Sheng

Zhang

2018

J of Chemical Tech & Biotech

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Sludge is regarded as a potential source to achieve valorization via strategies such as resource recovery, sludge based adsorbents preparation, bioflucculants production, sludge manufacturing construction materials preparation, sludge composting and thermal valorization, which are currently common and effective strategies. Appropriate treatment strategies of sludge are of great importance worldwide for the fast growing population and rapidly increasing waste. This mini review summarized some widely used and effective strategies to achieve sludge valorization based on whether the strategy would utilize or reuse the potential of sludge to obtain valuable product and eliminate secondary pollution. Anaerobic digestion of sludge is perceived as a potentially cost‐effective method to achieve sludge reduction and resource recovery including carbon, nitrogen, phosphorus resource recovery coupled with other technologies. Utilizing sludge as raw material for preparation of valuable products including sludge based adsorbents, bioflocculants and construction materials is another aspect to achieve sludge valorization. Sludge composting and thermal valorization are also introduced in the mini review since the two strategies could also achieve sludge valorization. In addition, the strategies mentioned were discussed and analyzed in the mini review from environmental and economic aspects. © 2017 Society of Chemical Industry

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“…To mitigate the harmful environmental impacts of organic solid waste, anaerobic digestion (AD) is widely implemented as a treatment strategy, providing waste stabilization as well as the production of renewable energy (30). AD changes the structure of the microbial community of the substrates which in turn affects the resistome present in digestion products.…”

Section: Introductionmentioning

confidence: 99%

Antibiotic resistome and microbial community structure during anaerobic co-digestion of food waste, paper and cardboard

Kanger

Guilford

Lee

et al. 2019

Preprint

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16Antimicrobial resistance is a globally recognized public health risk. High incidence of 17 antibiotic resistant bacteria and antibiotic resistance genes (ARGs) in solid organic waste 18 necessitates the development of effective treatment strategies. The objective of this study 19 was to assess ARG diversity and abundance as well as the relationship between resistome 20 and microbial community structure during anaerobic co-digestion (AD) of food waste, 21 paper and cardboard. A lab-scale solid-state AD system consisting of six sequentially fed 22 leach beds (each with a solids retention time of 42 days) and an upflow anaerobic sludge 23 blanket (UASB) reactor was operated under mesophilic conditions continuously for 88 24 weeks to successfully treat municipal organic waste and produce biogas. A total of ten 25 samples from digester feed and digestion products were collected for microbial 26 community analysis including SSU rRNA gene sequencing, total community 27 metagenome sequencing and quantitative PCR. Taxonomic analyses revealed that AD 28 changed the taxonomic profile of the microbial community: digester feed was dominated 29 by bacterial and eukaryotic taxa while anaerobic digestate possessed a large proportion of 30 archaea mainly belonging to the methanogenic genus Methanosaeta. ARGs were 31 identified in all samples with significantly higher richness and relative abundance per 16S 32 rRNA gene in digester feed compared to digestion products. Multidrug resistance was the 33 most abundant ARG type. AD was not able to completely remove ARGs as shown by 34ARGs detected in digestion products. Using metagenomic assembly and binning we 35 detected potential bacterial hosts of ARGs in digester feed, that included Erwinia, 36Bifidobacteriaceae, Lactococcus lactis and Lactobacillus. 37 38 3 IMPORTANCE 39Solid organic waste is a significant source of antibiotic resistance genes (ARGs) (1) and 40 effective treatment strategies are urgently required to limit the spread of antimicrobial 41 resistance. Here we studied the antibiotic resistome and microbial community structure 42 within an anaerobic digester treating a mixture of food waste, paper and cardboard. We 43 observed a significant shift in microbial community composition and a reduction in ARG 44 diversity and abundance after 6 weeks of digestion. We identified the host organisms of 45 some of the ARGs including potentially pathogenic as well as non-pathogenic bacteria, 46 and we detected mobile genetic elements required for horizontal gene transfer. Our 47 results indicate that the process of sequential solid-state anaerobic digestion of food 48waste, paper and cardboard tested herein provides a significant reduction in the relative 49 abundance of ARGs per 16S rRNA gene. 50 51 4 INTRODUCTION 52

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Anaerobic digestion for bioenergy production: Global status, environmental and techno-economic implications, and government policies

Cited by 271 publications

References 98 publications

Reviewing the Anaerobic Digestion of Food Waste: From Waste Generation and Anaerobic Process to Its Perspectives

Reviewing the Anaerobic Digestion of Food Waste: From Waste Generation and Anaerobic Process to Its Perspectives

Strategies of valorization of sludge from wastewater treatment

Antibiotic resistome and microbial community structure during anaerobic co-digestion of food waste, paper and cardboard

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