Study on the effect of FeCl3 on the purification efficiency and membrane fouling of AnMDBR wastewater
Resourceful reuse of wastewater is currently the focus of wastewater treatment.In this study,the impact of contaminant purification,water production,membrane fouling,and underlying mechanisms within a high-temperature(55 ℃)anaerobic membrane distillation bioreactor(AnMDBR)was examined,using three FeCl3 dosages(20 mg/L,50 mg/L,and 100 mg/L).The results showed that there was no significant difference in the removal efficiencies of COD,NH4+-N and P across the three FeCl3 dosages,with average removal rates exceeding 98.12％,81.80％and 99.99％,respectively.However,an increase in water production was observed,with the order of effect being 50 mg/L＞100 mg/L＞20 mg/L.This phenomenon was attributed to the modification of sludge characteristics by FeCl3,which included the augmentation of Zeta potential,particle size,and EPS concentration,while simultaneously leading to a reduction in SMP concentration.The alteration facilitated sludge agglomeration.Additionally,the formation of a loose,porous cake layer on the fouled membrane is achieved through the proper addition of FeCl3.Nevertheless,inorganic fouling of the membrane was exacerbated by excessive FeCl3 addition.Furthermore,FeCl3 addition increased the relative abundance of Methanothermobacter in the microbial community of AnMDBR,thereby promoting the methanogenesis process.These findings provide support for improving the wastewater treatment performance within iron salt-assist AnMDBR.
AnMDBRFeCl3sludge characteristicsmembrane foulingmicrobial community
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