化学絮凝与电絮凝调理污泥脱水性能影响作用的对比研究  

Comparison of the effects of chemical flocculation and electric flocculation conditioning on sludge dewatering performance

作　　者：陆香玉 俞海祥 陈亚 陈璐 章凯 杨耀 谷麟[1] 闻海峰[1] LU Xiangyu;YU Haixiang;CHEN Ya;CHEN Lu;ZHANG Kai;YANG Yao;GU Lin;WEN Haifeng(School of Environment and Architecture,University of Shanghai for Science and Technology,Shanghai 200093)

机构地区：[1]上海理工大学环境与建筑学院,上海200093

出　　处：《环境科学学报》2022年第3期257-267,共11页Acta Scientiae Circumstantiae

摘　　要：电絮凝污泥调理是近年来发展起来的一种新型污泥预处理技术,具有破解污泥絮体、溶出胞外聚合物、改变污泥颗粒结构等作用,是实现后端污泥稳定化和减量化的有效手段.本研究比较了传统化学絮凝与电絮凝调理对污泥脱水性能的影响,深入分析了调理过程对污泥过滤性能、EPS组分和絮体结构的改变,并在此基础上优化了电絮凝操作条件.结果表明,以铁板为阳极,铝板为阴极,当工作电压为15 V,极板间距为4 cm时,污泥的脱水性能可达到最佳,此时污泥毛细吸水时间(CST)下降55.4%;而采用传统絮凝法,当铁盐投加量与铁的阳极溶出量相同时,污泥CST值仅下降17%.电絮凝能够同时实现污泥絮体颗粒的破解与脱稳,调理20 min后,污泥沉降体积降至25 mL,污泥泥饼含水率可降至66%,污泥崩解度(DD_(SCOD))可达1.79%.此时松散附着型(LB-EPS)和紧密结合型胞外聚合物(TB-EPS)组成均发生明显改变,污泥絮体结构得以重建,污泥沉降性能和脱水性能显著提升.Electro-flocculation is a new type of pretreatment for sludge dewatering in recent years,which can function as cracking the sludge flocs,dissolution of extracellular polymer and changing the sludge particle structure.It is an effective mean to realize the stabilization and reduction of sewage sludge.In this study,we compared the effects of traditional chemical flocculation and electro-flocculation as pretreatment for sludge dewatering.Changes on sludge filtration performance,EPS composition,and floc structure were analyzed during the conditioning.The results showed that the optimal sludge dewatering(the capillary absorption time(CST)of the conditioned sludge decreased by 55.4%)can be achieved as the cell voltage and place distance was 15V and 4 cm respectively.Compared with traditional flocculation method,the CST value can be only reduced by 17%when the iron salt was dosed with the same amount as anodic leaching amount.Electro-flocculation can simultaneously achieve the cracking and destabilization of sludge floc particles.The sludge disintegration degree(DD_(SCOD))can reach 1.79%in 20 min,resulting in a significant change in the composition of loosely attached(LB-EPS)and tightly bound extracellular polymers(TB-EPS).The sludge floc structure can be reconstructed,which was conducive to the effective improvement of sludge settling performance and dewaterability.

关 键 词：电絮凝 化学絮凝 污泥脱水 絮凝剂 崩解度 

分 类 号：X703[环境科学与工程—环境工程]