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Journal ArticleDOI

Bio-energy recovery from high-solid organic substrates by dry anaerobic bio-conversion processes: a review.

TL;DR: In this article, the authors provide existing knowledge and research advances in D-AnBioC systems to treat high-solid organic substrates (OS), identify major issues involved in bioreactor designing, present factors influencing the bio-conversion efficiency, and discuss the microbiology of system operation.
Abstract: Dry anaerobic bio-conversion (D-AnBioC) of high-solid organic substrates (OS) is considered as a sustainable option for waste management practices in different parts of the world. The basic technology is well implemented, but the improvements are still under way in terms of optimization and pre- and post-treatments of the feed and end-products, respectively. The purpose of this review is mainly to: (1) provide existing knowledge and research advances in D-AnBioC systems to treat high-solid OS; (2) identify major issues involved in bioreactor designing; (3) present factors influencing the bio-conversion efficiency; (4) discuss the microbiology of system operation; (5) provide examples of existing commercial-scale plants; (6) discuss energy and economics requirements. From the detailed literature review, it is clear that the characteristics of OS are the major factors governing the overall process and economics. It shows that not all OS are profitably recycled using D-AnBioC systems. Compared to single-stage continuous systems, batch systems under a multi-stage configuration appears to be economically feasible, however, it must be noted that the available data sets are still inconclusive. Also, limited information is available on green house gas mitigation and restoration of nutrients from the digested residue during post-treatment schemes. A summary at the end presents important research gaps of D-AnBioC system to direct future research.
Citations
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Journal ArticleDOI
TL;DR: In this article, a review of the potential of dark fermentation of organic biomasses and its potential in green energy-efficient green chemistry applications is presented, with a brief review on the simulation and modeling of the dark fermentation processes and their energy balance.

711 citations


Cites background from "Bio-energy recovery from high-solid..."

  • ...By increasing the TS content, dry fermentation processes can be operated at a high OLR with little water addition, which offers advantages such as smaller reactor volume, easy handling of the digestate residues and technical simplicity [136,265]....

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  • ...Anaerobic reactors are generally categorized into wet (<10% TS), semi-dry (10–20% TS) and dry (>20% TS) processes [265]....

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Journal ArticleDOI
TL;DR: Anaerobic digestion of lignocellulosic biomass provides an excellent opportunity to convert abundant bioresources into renewable energy and its challenges are discussed.

535 citations


Cites background from "Bio-energy recovery from high-solid..."

  • ...…AD is classified into three important groups based on their operating total solids (TS) contents namely; liquid (L-AD), semi-solid (S-AD), and solid-state (SS-AD) with respective TS concentrations of less than 10%, 10-20% and more than 20% (Karthikeyan and Visvanathan, 2012; Cui et al., 2011)....

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  • ...…are lower reactor volumes, higher organic loading rates (OLRs), less water for dilution, less mixing requirement, no floating substrates (in the bioreactor), lower costs for managing the digestate, and overall, lower energy input for operation (Liew et al., 2012; Karthikeyan and Visvanathan, 2012)....

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Journal ArticleDOI
TL;DR: The different aspects of anaerobic biodegrading approaches for food waste, effects of cosubstrates, effect of environmental factors, contribution of microbial population, and available computational resources for food Waste management researches are explored.
Abstract: Food wastage and its accumulation are becoming a critical problem around the globe due to continuous increase of the world population. The exponential growth in food waste is imposing serious threats to our society like environmental pollution, health risk, and scarcity of dumping land. There is an urgent need to take appropriate measures to reduce food waste burden by adopting standard management practices. Currently, various kinds of approaches are investigated in waste food processing and management for societal benefits and applications. Anaerobic digestion approach has appeared as one of the most ecofriendly and promising solutions for food wastes management, energy, and nutrient production, which can contribute to world’s ever-increasing energy requirements. Here, we have briefly described and explored the different aspects of anaerobic biodegrading approaches for food waste, effects of cosubstrates, effect of environmental factors, contribution of microbial population, and available computational resources for food waste management researches.

336 citations

Journal ArticleDOI
TL;DR: In this article, a review summarizes the challenges in SS-AD of lignocellulosic biomass and discusses the mechanisms and feasibility of potential strategies for resolving them, including pretreatment of feedstock, improvement of inoculation efficiency, co-digestion of multiple feedstocks, and upgrading biogas to higher value transportation fuels.
Abstract: Solid-state anaerobic digestion (SS-AD) has gained increasing attention in recent years, especially for digesting lignocellulosic biomass Compared to liquid anaerobic digestion (L-AD), SS-AD handles feedstocks with higher total solids content, and therefore, performs more effectively at higher organic loading rates and has higher volumetric biogas productivity Challenges facing SS-AD of lignocellulosic biomass are primarily related to its relatively low methane yield, potential instability, and low value end-products These challenges are either due to the inherent limits of SS-AD (eg retarded mass transfer caused by high solid content) or can be attributed to the nature of lignocellulosic biomass (eg components recalcitrant to biodegradation) To address these challenges, a variety of methods, including pretreatment of feedstock, improvement of inoculation efficiency, co-digestion of multiple feedstocks, and upgrading biogas to higher-value transportation fuels, have been examined to enhance the performance of SS-AD and increase the value of the end products This review summarizes these challenges in SS-AD of lignocellulosic biomass and discusses the mechanisms and feasibility of potential strategies for resolving them

296 citations

Journal ArticleDOI
TL;DR: The main aim of this article is to summarize the recent updates and review different holistic approaches for efficient anaerobic co-digestion (AcoD) of FW and SS to provide a comprehensive review on the topic.

223 citations

References
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Journal ArticleDOI
TL;DR: This paper reviews process parameters and their fundamental modes of action for promising pretreatment methods and concludes that pretreatment processing conditions must be tailored to the specific chemical and structural composition of the various, and variable, sources of lignocellulosic biomass.

6,110 citations


"Bio-energy recovery from high-solid..." refers background or methods in this paper

  • ...…accessibility for bacterial/enzymatic action; (3) minimize sugar degradation and lignin solubilization; (4) be environmentally friendly and a less energy intensive process; and (5) be a scalable, simple and robust system (Ghosh and Singh 1993; Mosier et al. 2005; Mtui 2009; Harmsen et al. 2010)....

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  • ...4.2 Pre-treatment of substrates Generally, pre-treatment technologies were adopted to alter or remove these structural/compositional impediments to increase the yields of fermentable simple sugars/intended products in order to further process utilizations (Mosier et al. 2005)....

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  • ...Specifically, any pretreatment technology is intended to: (1) free as much carbohydrates as possible into monomers; (2) provide easy accessibility for bacterial/enzymatic action; (3) minimize sugar degradation and lignin solubilization; (4) be environmentally friendly and a less energy intensive process; and (5) be a scalable, simple and robust system (Ghosh and Singh 1993; Mosier et al. 2005; Mtui 2009; Harmsen et al. 2010)....

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  • ...Generally, pre-treatment technologies were adopted to alter or remove these structural/compositional impediments to increase the yields of fermentable simple sugars/intended products in order to further process utilizations (Mosier et al. 2005)....

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Journal ArticleDOI
TL;DR: Simultaneous saccharification and fermentation effectively removes glucose, which is an inhibitor to cellulase activity, thus increasing the yield and rate of cellulose hydrolysis, thereby increasing the cost of ethanol production from lignocellulosic materials.

5,860 citations

Journal ArticleDOI
TL;DR: This review provides a detailed summary of the research conducted on the inhibition of anaerobic processes and indicates that co-digestion with other waste, adaptation of microorganisms to inhibitory substances, and incorporation of methods to remove or counteract toxicants before an aerobic digestion can significantly improve the waste treatment efficiency.

4,123 citations

Journal ArticleDOI
TL;DR: A review of various pretreatment process methods and the recent literature that has been developed can be found in this paper, where the goal of pretreatment is to make the cellulose accessible to hydrolysis for conversion to fuels.
Abstract: Biofuels produced from various lignocellulosic materials, such as wood, agricultural, or forest residues, have the potential to be a valuable substitute for, or complement to, gasoline. Many physicochemical structural and compositional factors hinder the hydrolysis of cellulose present in biomass to sugars and other organic compounds that can later be converted to fuels. The goal of pretreatment is to make the cellulose accessible to hydrolysis for conversion to fuels. Various pretreatment techniques change the physical and chemical structure of the lignocellulosic biomass and improve hydrolysis rates. During the past few years a large number of pretreatment methods have been developed, including alkali treatment, ammonia explosion, and others. Many methods have been shown to result in high sugar yields, above 90% of the theoretical yield for lignocellulosic biomasses such as woods, grasses, corn, and so on. In this review, we discuss the various pretreatment process methods and the recent literature that...

3,450 citations

Journal ArticleDOI
TL;DR: In this article, the authors extensively review the principles of anaerobic digestion, the process parameters and their interaction, the design methods, the biogas utilisation, the possible problems and potential pro-active cures, and the recent developments to reduce the impact of the problems.

2,616 citations


"Bio-energy recovery from high-solid..." refers background in this paper

  • ...It is the average time solids reside within the digester (Appels et al. 2008)....

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  • ...Also, the high ammonia concentrations associated with low C/N ratios can be another a Millimole of metal per kg of dry solids; Source: Polprasert (2007), Appels et al. (2008), Chen et al. (2008), Dong et al. (2010) inhibiting factor that limits maximum sustainable OLR (Banks et al. 2008)....

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