Research Progress of Effect of Microplastics on Anaerobic Digestion of Sludge
Anaerobic digestion(AD)is one of the important technologies for sludge disposal,but the coexistence of microplastics(MPs)in sludge will affect the performance of AD.The paper reviews the effects and mechanisms of MPs on AD of sludge.The results show that the MPs properties(type,concentration and size)significantly affect the AD performance of sludge.Most MPs inhibit the formation of methane,and the inhibition effect enhances with the increase of MPs concentration or the decrease of MPs size.The synergistic interaction between MPs and other pollutants,as well as the digestion process(pretreatment,temperature,substrate,etc.),will influence the effect of MPs on AD.MPs mainly affect the performance of sludge AD by releasing extract,inducing ROS production,affecting key enzyme activity,and changing microbial community structure.Future research should further explore the synergistic effects of various MPs,identify the key factors of MPs affecting AD,and develop mitigation technologies for MPs inhibition.
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