阳离子聚丙烯酰胺对污泥电渗透脱水特性的影响  

Effect of Cationic Polyacrylamide on Electro-dewatering Behavior of Sludge

作　　者：于晓艳[1] 李英特[2] 李登琨 张书廷[2] YU Xiao-yan;LI Ying-te;LI Deng-kun;ZHANG Shu-ting(School of Mining and Technology,Liaoning Technical University,Huludao 125105,China;School of Environmental Science and Engineering,Tianjin University,Tianjin 300350,China;China Coal Pingshuo Group Co.Ltd.,Shuozhou 036000,China)

机构地区：[1]辽宁工程技术大学矿业技术学院,辽宁葫芦岛125105 [2]天津大学环境科学与工程学院,天津300350 [3]中煤平朔集团有限公司,山西朔州036000

出　　处：《中国给水排水》2019年第23期120-126,共7页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51608247)

摘　　要：电渗透脱水技术对于污泥深度脱水具有经济性优势,尤其适用于机械脱水后的污泥。而阳离子聚丙烯酰胺(CPAM)是机械脱水工业中应用最普遍的调质剂,故考察了CPAM调质对污泥电渗透脱水的影响。结果显示,虽然CPAM有利于污泥的机械脱水,但是却造成后续电渗透脱水效率的下降,综合权衡后CPAM的最佳投加量为3 mg/g干泥,且在电场强度为20 V/cm、脱水时间为6 min的条件下,污泥的含水率由机械脱水后的80%下降至62.4%,平均耗能为0.061 kW·h/kgH2O。污泥的表面电荷是CPAM影响污泥电渗透脱水效率的一个重要因素,而污泥颗粒粒径和结合水含量对其影响较小。此外,CPAM可以有效抑制电渗透脱水阴极侧污泥的黏壁问题。Electro-dewatering technology has a cost-efficient potential for deep dewatering of sludge,especially for sludge after mechanical dewatering.Cationic polyacrylamide(CPAM)is the most widely used conditioner in mechanical dewatering industry.The influence of CPAM on electro-dewatering behavior was investigated.Although CPAM was beneficial for mechanical dewatering,it decreased the subsequent electro-dewatering efficiency.After comprehensive balance,the optimal dosage of CPAM was 3 mg/g dry sludge.When the applied electric field intensity and dewatering time were 20 V/cm and 6 min,the water content decreased from 80% to 62.4% and the average energy consumption was 0.061 kW·h/kg H2O.The surface charge of sludge was an important factor that CPAM affected the dewatering efficiency of electro-dewatering,but the effect of sludge particle size and bound water content was small.Besides,CPAM could effectively inhibit sludge adhesion on the cathode side of electro-dewatering.

关 键 词：污泥 电渗透脱水 阳离子聚丙烯酰胺 黏壁性 滑动层厚度 

分 类 号：TU992[建筑科学—市政工程]