城市污泥电渗脱水实验研究-环境科学学报.PDF

第 32 卷第5 期 环　 境　 科　 学　 学　 报 Vol.32,No.5 2012年5月 　Acta Scientiae Circumstantiae May,2012 冯源,詹良通,陈云敏.2012.城市污泥电渗脱水实验研究[J].环境科学学报,32(5):1081-1087 Feng Y,Zhan LT, Chen Y M. 2012. Laboratory study on electroosmosis dewatering of sewage sludge[J]. Acta Scientiae Circumstantiae,32(5): 1081-1087 城市污泥电渗脱水实验研究 ∗ 冯源,詹良通 ,陈云敏 浙江大学,软弱土与环境土工教育部重点实验室,杭州310058 收稿日期:2011-06-22　 　 　 修回日期:2011-10-27　 　 　 录用日期:2011-10-31 摘要:电渗脱水是一种能有效去除污泥中水分以实现减量的处理方法. 本文采用自制电渗脱水装置进行了城市污泥的电渗脱水实验. 通过监 测脱水过程中电渗流量、电压梯度与剩余含水率的变化,考察了电压梯度、电极间距和处理时间的影响,并进一步分析了电渗处理过程中脱水 效果变化的原因. 处理中随着脱水效果由阳极向阴极发展,污泥可划分为已脱水污泥与未脱水污泥,已脱水污泥内电渗停止,电渗与水分的 脱除发生在未脱水污泥内,并由未脱水污泥的电压梯度决定. 已脱水污泥阻值上升,使未脱水污泥电压梯度逐渐降低,造成了电渗流量与脱 水效果的衰减,并使得污泥剩余含水率由阳极至阴极逐渐增加. 电渗脱水的整体效果随加载电压的增加而提高,脱水能耗亦随之增加,选取 较小的电极间距时电渗脱水能效较高. 关键词:污泥;电渗脱水;电渗流量;脱水效果;电压梯度;剩余含水率 文章编号:0253-2468(2012)05-1081-07　 　 　 中图分类号:X703　 　 　 文献标识码:A Laboratory study on electroosmosis dewatering of sewage sludge ∗ FENG Yuan,ZHAN Liangtong ,CHEN Yunmin MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering,Zhejiang University,Hangzhou310058 Received22 June2011;　 　 　 received in revised form27 October2011;　 　 　 accepted31 October2011 Abstract:Electroosmosis dewatering is a method which can remove water in sludge effectively to achieve volume reduction. This paper presented a laboratory study on electroosmosis dewatering of sludge with purposely-designed apparatuses. During the dewatering tests,the changes of electroosmotic flow rate,voltage gradient and residual water content were measured. On the basis of the measurements,the influences of voltage gradient,electrode distance and treating time on the dewatering processwere analyzed,and the attenuation mechanism in the dewatering effect was explained. It was found that the electroosmosis dewatering gradually extended from the anod