Research Progress on Relieving Effect of Exogenous Substances on Inhibition of Anaerobic Digestion by Polycyclic Aromatic Hydrocarbons

SUN Xiyuan; AO Guoxu; WANG Zhaoxuan; GE Jingping; LING Hongzhi; SUN Shanshan

doi:10.11924/j.issn.1000-6850.casb2024-0741

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Chin Agric Sci Bull ›› 2025, Vol. 41 ›› Issue (11) : 74-81. DOI: 10.11924/j.issn.1000-6850.casb2024-0741

Research Progress on Relieving Effect of Exogenous Substances on Inhibition of Anaerobic Digestion by Polycyclic Aromatic Hydrocarbons

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Abstract

Anaerobic digestion, a widely utilized technology for the treatment of organic waste, offers the dual benefits of emission reduction and energy recovery. Anaerobic digestion is susceptible to various factors due to the complex biochemical reactions involved in the process. Polycyclic aromatic hydrocarbons (PAHs) are a class of refractory organic pollutants, which mainly come from human activities such as industrial wastewater, incomplete combustion of fossil fuels and automobile exhaust emissions. PAHs possess toxicity and adsorptive. In anaerobic digestion systems, it is necessary to find methods to reduce the content of PAHs in the substrate since PAHs often mix with other materials, influencing hydrolysis, acidification and methanogenesis, which hinder degradation of substrate and methane production. Compared to physical and chemical methods such as heating, adsorption and photolysis, adding exogenous substances to promote the removal of PAHs has the advantages of simplicity, lower cost and reduced secondary pollution. The paper reviewed the influencing factors of anaerobic digestion, the inhibitory effects of PAHs on anaerobic digestion and strategies to alleviate the inhibitory effects of PAHs by introducing different exogenous substances, aiming to provide references for further improving the anaerobic digestion technology.

Key words

polycyclic aromatic hydrocarbon / anaerobic digestion / exogenous substance / relieving effect

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SUN Xiyuan , AO Guoxu , WANG Zhaoxuan , et al . Research Progress on Relieving Effect of Exogenous Substances on Inhibition of Anaerobic Digestion by Polycyclic Aromatic Hydrocarbons[J]. Chinese Agricultural Science Bulletin. 2025, 41(11): 74-81 https://doi.org/10.11924/j.issn.1000-6850.casb2024-0741

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