RESEARCH PROGRESS ON EFFECTS OF MICROPLASTICS ON EXCESS SLUDGE AND THEIR DEGRADATION PATHWAYS
The residual microplastics(MPs)in excess sludge potentially harm the environment and ecosystems.Therefore,it is necessary to study the migration,fate,and degradation mechanism of MPs in excess sludge,and develop effective degradation methods to deal with the MPs problem.The occurrence state of MPs in excess sludge is first introduced and the effects of MPs on the properties of excess sludge and sludge treatment are analyzed.The effects are closely related to the type,concentration,and particle size of MPs.Secondly,the degradation pathways of MPs in wastewater treatment plants are reviewed,which can be divided into non-biodegradable and biodegradable pathways.Non-biodegradable pathways include pyrolysis and hydrothermal treatment.Biodegradable pathways include sludge composting,anaerobic digestion,and biofilm method.The degradation efficiency and mechanism of MPs are discussed and the characteristics and application prospects of each pathway are analyzed.Among them,hydrothermal treatment and sludge composting have high MPs degradation efficiency,good economic viability,and wide applicability.Currently,the research on the degradation of MPs in excess sludge is still in the preliminary stage,and further research is needed to tackle the MPs problem.
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