Anaerobic digestion of food waste: A review focusing on process stability

Li, Lei; Peng, Xiangjun; Wang, Xiaoming; Wu, Di

doi:10.1016/j.biortech.2017.07.012

Cited by 201 publications

(97 citation statements)

References 89 publications

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“…The nature of organic substrate characteristics in AD makes it possible for the categorization of the AD as wet (10% total solids), semi‐dry (10%‐20% TS), and dry (20% and above TS) bioconversion process . Although the wet AD and dry AD have unique advantages and shortcoming during the bioconversion of waste, the technology still faces some major challenges such as operational instability, quality of digestate that cannot be digested by microorganisms, or rather difficult/slowly digested substrates . The AD also faces the challenges of inhibitors that render inhibitory phenomenon in the reactor affecting microbial performance …”

Section: Review Of the Food Waste Properties Environmental Issues Amentioning

confidence: 99%

“…FW is the largest component of municipal solid waste (MSW); China MSW accounted for about 50% FW with 245 000 tons per day of FW generated . FW production in China as at 2017 reached 97.72 million tons, and conventional techniques for the treatment of FW are no longer considered viable due to the environmental challenges, high moisture content, low calorific value, perishability, and the need for sustainable recovery . Among several traditional methods such as landfilling and incineration, anaerobic digestion (AD) has been considered to be much sustainable and economical for resource recovery .…”

Section: Introductionmentioning

confidence: 99%

“…FW production in China as at 2017 reached 97.72 million tons, and conventional techniques for the treatment of FW are no longer considered viable due to the environmental challenges, high moisture content, low calorific value, perishability, and the need for sustainable recovery . Among several traditional methods such as landfilling and incineration, anaerobic digestion (AD) has been considered to be much sustainable and economical for resource recovery . AD process with the aid of biological microorganism can convert FW to products with additional value as organic fertilizer and soil emulsifier with modest methods and low‐cost tendency …”

Section: Introductionmentioning

confidence: 99%

“…Among several traditional methods such as landfilling and incineration, anaerobic digestion (AD) has been considered to be much sustainable and economical for resource recovery . AD process with the aid of biological microorganism can convert FW to products with additional value as organic fertilizer and soil emulsifier with modest methods and low‐cost tendency …”

Section: Introductionmentioning

confidence: 99%

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Pyrolysis coupled anaerobic digestion process for food waste and recalcitrant residues: Fundamentals, challenges, and considerations

Giwa

Chang

et al. 2019

Energy Science & Engineering

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Food waste (FW) is a severe environmental problem all over the world, and the recalcitrant organic residues (ROR) from FW treatment plant operations are also a critical environmental issue due to unsustainable treatment and disposal techniques.Requirements for FW and ROR complete exploitation with the establishment of recycling-renewable technologies are very crucial. This paper review AD and pyrolysis as two promising technologies to degrade FW and its residues, creating numerous renewable bioenergy yields with value-added. Existing oil/tar application methods in the AD suffered from various problems such as microorganism toxicity and limited productivity. Future upgrading techniques considering the second-stage pyrolysis process to decompose oil/tars for syngas with high hydrogen content and enhanced bio-methanation in the AD were addressed. Simultaneous pyrolysis by-product recycle in the AD during the valorization of FW are aimed to have the features of sustainability toward increased bioenergy production, reactor efficiency, and agricultural application. K E Y W O R D Sanaerobic digestion, coupling, food waste, pyrolysis, recalcitrant organic residues | 2251 GIWA et Al.

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Section: Review Of the Food Waste Properties Environmental Issues Amentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pyrolysis coupled anaerobic digestion process for food waste and recalcitrant residues: Fundamentals, challenges, and considerations

Giwa

Chang

et al. 2019

Energy Science & Engineering

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“…Trace element and mineral supplementation has also been proposed by various researchers and organizations as an alternative approach to achieving a stable process ([6, [12][13][14]). A recent review study on the stability issues in food waste digestion recommended a need for intensive process monitoring and microbial management to address instability issues associated with food waste digestion [15]. In another review focusing on anaerobic digestion of food waste, none of the research studies reviewed used a secondary food waste stream as a co-substrate in food scrap digestion [16].…”

Section: Introductionmentioning

confidence: 99%

Anaerobic Digestion of Food Waste with Unconventional Co-Substrates for Stable Biogas Production at High Organic Loading Rates

Hegde

Trabold

2019

Sustainability

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Anaerobic digestion (AD) is widely considered a more sustainable food waste management method than conventional technologies, such as landfilling and incineration. To improve economic performance while maintaining AD system stability at commercial scale, food waste is often co-digested with animal manure, but there is increasing interest in food waste-only digestion. We investigated the stability of anaerobic digestion with mixed cafeteria food waste (CFW) as the main substrate, combined in a semi-continuous mode with acid whey, waste bread, waste energy drinks, and soiled paper napkins as co-substrates. During digestion of CFW without any co-substrates, the maximum specific methane yield (SMY) was 363 mL gVS −1 d −1 at organic loading rate (OLR) of 2.8 gVSL −1 d −1 , and reactor failure occurred at OLR of 3.5 gVSL −1 d −1 . Co-substrates of acid whey, waste energy drinks, and waste bread resulted in maximum SMY of 455, 453, and 479 mL gVS −1 d −1 , respectively, and it was possible to achieve stable digestion at OLR as high as 4.4 gVSL −1 d −1 . These results offer a potential approach to high organic loading rate digestion of food waste without using animal manure. Process optimization for the use of unconventional co-substrates may help enable deployment of anaerobic digesters for food waste management in urban and institutional applications and enable increased diversion of food waste from landfills in heavily populated regions.

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