Effects of anaerobic digestion of food waste on biogas production and environmental impacts: a review

Chew, Kah Rong; Leong, Hui Yi; Khoo, Kuan Shiong; Vo, Dai‐Viet N.; Anjum, Hirra; Chang, Chih-Kai; Show, Pau Loke

doi:10.1007/s10311-021-01220-z

Cited by 90 publications

(33 citation statements)

References 118 publications

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“…Food waste is almost free from emerging contaminants; however, biogas productivity from anaerobic digestion of food waste as a standalone substrate is quite low (Chew et al 2021;Liu et al 2021b). The bioenergy productivity is highly increased by anaerobic digestion of food waste with co-substrate, i.e., agricultural, biosolids or sludge, and manures.…”

Section: Anaerobic Digestion Of Sludges Containing Emerging Contaminantsmentioning

confidence: 99%

Methods to alleviate the inhibition of sludge anaerobic digestion by emerging contaminants: a review

et al. 2022

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The rising occurrence of emerging contaminants in sludges both inhibits the anaerobic digestion of sludges and induces health issues when sludges are recycled in agriculture, calling for methods to remove contaminants. Here we review emerging pollutants in wastewater treatment plants, before and after anaerobic digestion. We present their inhibitory effects and remediation methods to alleviate inhibition. Pharmaceuticals have been detected in about 50% of the sludge samples. Sewage sludge contaminants include 19% of diuretics, 16–21% of lipid-modifying agents, hydrochlorothiazide, diclofenac, furosemide, clarithromycin, atorvastatin, and carbamazepine. Levels of antibiotics, azithromycin, ciprofloxacin, and estrone range from 500 to 600 ng/g in sludges from wastewater treatment plants. Remediation methods comprise electrooxidation, ultrasonication, thermal hydrolysis, ozonation, and bioaugmentation. Fermenting the sludges with acidogenic bacteria reduces the level of emerging pollutants in the supernatant. Nonetheless, liquid digestates still contains emerging pollutants such as sunscreen octocrylene at 147 ug/L and acetaminophen at 58.6 ug/L. As a result, pretreatment of sludge containing emerging pollutants is required.

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Section: Anaerobic Digestion Of Sludges Containing Emerging Contaminantsmentioning

confidence: 99%

Methods to alleviate the inhibition of sludge anaerobic digestion by emerging contaminants: a review

et al. 2022

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“…Furthermore, while reducing the release of GHG, AD reduces the usage of fossil fuels, including the generation of electricity for human energy needs. AD is practically a zero-waste approach that produces the least pollution as compared to other approaches such as incineration, gasification, and pyrolysis (Chew et al, 2021). The digestate produced as a solid residue could supplement as quality manure that improves soil quality (Mohanty et al, 2021).…”

Section: Technologies and Strategies For Improved Anaerobic Digestion...mentioning

confidence: 99%

Food Waste Valorisation for Biogas-Based Bioenergy Production in Circular Bioeconomy: Opportunities, Challenges, and Future Developments

et al. 2022

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The fossil fuel-based linear economy has inherent intricacies such as environmental pollution and the continued need for energy sourcing. Consequently, there has been a shift to a more sustainable circular bio-economy, in which biomass waste is valorised for energy generation while reducing the bulk waste materials and greenhouse gas emissions. In modern bioeconomy, biogas is a primary energy production vehicle. Bio-based economy-enabled technologies result in heat and electricity generation, considerable substitution of fossil fuels for transport, and also the manufacture of additional value-added products and byproducts of economic benefits. Wastes from industrial operations, agriculture, and other anthropogenic activities such as food waste (FW) can be biodigested and transformed into valuable energy sources, nutrient-rich manure, and speciality chemicals. However, for instance, although closed anaerobic membrane bioreactors can totally avoid a microbial runoff, membrane fouling frequently affects the hydraulic performance. Recent developments in anaerobic digestion (AD) of FW have diversified into pretreatment, organic loading, additive supplementation, parametric optimisation, and digestate recirculation to enhance the utility potential of biomass for energy and environment. These numerous anaerobic and microbial interventions support biomass valorisation and related processes, resulting in more efficient biomethanation. Valorisation of FW through biogas-based energy production could serve as an essential cog in the wheel of a circular bioeconomy.

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“…Biogas is produced by anaerobic digestion of waste generated from municipal, agricultural, and industry at moderateto-high temperature (Chew et al 2021;Mofijur et al 2021). The upgrading of biogas aims at separating methane from CO 2 and other biogases.…”

Section: Biogas Upgradingmentioning

confidence: 99%

Biogas upgrading, economy and utilization: a review

et al. 2021

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Biogas production is rising in the context of fossil fuel decline and the future circular economy, yet raw biogas requires puri-fication steps before use. Here, we review biogas upgrading using physical, chemical and biological methods such as water scrubbing, physical absorption, pressure swing adsorption, cryogenic separation, membrane separation, chemical scrubbing, chemoautotrophic methods, photosynthetic upgrading and desorption. We also discuss their techno-economic feasibility. We found that physical and chemical upgrading technologies are near-optimal, but still require high energy and resources. Biological methods are less explored despite their promising potential. High-pressure water scrubbing is more economic for small-sized plants, whereas potassium carbonate scrubbing provides the maximum net value for largesized plants.

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Effects of anaerobic digestion of food waste on biogas production and environmental impacts: a review

Cited by 90 publications

References 118 publications

Methods to alleviate the inhibition of sludge anaerobic digestion by emerging contaminants: a review

Methods to alleviate the inhibition of sludge anaerobic digestion by emerging contaminants: a review

Food Waste Valorisation for Biogas-Based Bioenergy Production in Circular Bioeconomy: Opportunities, Challenges, and Future Developments

Biogas upgrading, economy and utilization: a review

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