不同混凝剂在水处理工艺中对微囊藻毒素厌氧生物降解影响研究

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中图分类号：X703 文献标志码：A 文章编号：1002-4026（2025）05-0123-08

Abstract：This study investigated the efects of diferent coagulants—namely chitosan，polyaluminumchloride（PAC）， and ferric chloride（ FeCl3 ）一on cyanobacterial cell breakage and microcystin-LR（MC-LR） anaerobic biodegradation in rawwatercontainingalgaeduringconventionaldrinking-watertreatment.Analyseswereconductedusing three-dimensional excitationemision matrix（3D-EEM）fluorescence spectroscopy，scanning electronmicroscopy，and enzyme-linked immunosorbent assays.Results showed that coagulated flocs generated by the action of FeCl3 had no significant effect on cyanobacterialcellbreakageortotalMC-LRdegradation.Chitosaninitiallyprotectedcyanobacterialcelsandadsorbed extracellularMC-LR；however，itseffctivenessdeclinedovertime.Meanwhile，PACsignificantlyexacerbated cyanobacterial cell breakage，leading tothemassvereleaseof intracelular toxins，whichultimatelyaccelerated the degradationrateofttalMC-LR.Inadition，3D-EEMfluorescence spectroscopyrevealed increasingconcentrations offive substance types，suchas the ammoniacal/tryptophan proteinzone and tyrosine/tryptophan zone，indicating that the diferentcoagulants hada signficant effectontheproductionof extracelular polymers inthesludge.Further，therelated substances increased in amount the fastest when PAC was used.This studyis the first to systematicaly investigate the mechanisms bywhich coagulantsaffect cyanobacterial celsand MC-LR anaerobic degradation，providing an important reference for the eficient removal of cyanobacteria and their toxins from waterworks sludge.

Cey words ∵ waterworks sludge；microcystin-LR；coagulant flocs；alga-containing sludge；anaerobic biodegradation

近年来，由蓝藻水华引起的微囊藻毒素（microcystins，MCs）次生污染已成为国内外关注的热点问题，其中存在最普遍、含量最多的是微囊藻毒素-LR（MC-LR）和微囊藻毒素-RR（MC-RR），且 MC-LR的急性毒性最强。（剩余9397字）