摘要
为了研究不同阳离子聚丙烯酰胺有机脱水剂对污泥脱水性能的影响,选用市售同系列不同性质的8种阳离子聚丙烯酰胺,基于其阳离子度的不同,名称分别为9101、9102、910^(3)、9104、9106、9108、9110和9112,采用仪器和化学分析手段对其性质进行表征,并研究分析处理后污泥各项指标的变化情况.结果表明,8种有机脱水剂的性质各不相同,电荷密度、阳离子度、黏度和Zeta电位具有类似的变化趋势,均为从9101~9112,上述各项指标值逐渐增加,9112的上述4种指标分别高达2.98 meq·L^(-1)、17.42%、85.07 mPa·s和67.10 mV.在污泥脱水过程中,有机脱水剂可通过改变污泥比阻(SRF)、絮体特性、黏度、污泥颗粒表面Zeta电位、结合水含量和胞外聚合物(EPS)的分布来改善污泥脱水性能.有机脱水剂性质与污泥脱水性能的关系研究结果表明,有机脱水剂的黏度、电荷密度、阳离子度和Zeta电位对污泥的脱水性能有较大影响,其中污泥的SRF与有机脱水剂的黏度呈负相关,其相关系数高达0.92025,表明在污泥脱水处理中,有机脱水剂主要通过高的分子量发挥吸附架桥作用来改善污泥脱水性能.
To study the effect of different cationic polyacrylamide organic dehydrating agents on sludge dewatering performance, eight commercially available cationic polyacrylamides of the same series with different properties were used. Based on the different cationic degree, they were named 9101, 9102, 910^(3), 9104, 9106, 9108, 9110, and 9112, respectively. Their properties were characterized by instruments and chemical analysis, and the indexes of sludge after treatment were also measured. The results showed that the properties of the eight organic dehydrants were different, among which the charge density, cationicity, viscosity, and Zeta potential had homologous trends, which all increased gradually from 9101 to 9112. The four indexes of 9112 were as high as 2.98 meq·L^(-1), 17.42%, 85.07 mPa·s, and 67.10 mV, respectively. The dewatering performance of sludge was improved by improving the specific resistance of filtration(SRF), floc properties, viscosity, Zeta potential, the bound water content, and the distribution of extracellular polymeric substances(EPS) after dosing organic dewatering agents. The results showed that the viscosity, charge density, cationic degree, and Zeta potential of the dewatering agents had a great influence on the sludge dewatering performance. The SRF of sludge was negatively correlated with the viscosity of the organic dewatering agent, and the correlation coefficient was as high as 0.920 25, indicating that the sludge dewatering performance was improved mainly through the adsorption bridging effect of the organic dewatering agent in sludge dewatering.
作者
冯齐云
高宝玉
岳钦艳
石伟杰
冯春晖
周继柱
王国瑞
FENG Qi-yun;GAO Bao-yu;YUE Qin-yan;SHI Wei-jie;FENG Chun-hui;ZHOU Ji-zhu;WANG Guo-rui(Shandong Key Laboratory of Water Pollution Control and Resource Reuse,School of Environmental Science and Engineering,Shandong University,Qingdao 266237,China;Smedic Technology Co.,Ltd.,Hejian 062450,China)
出处
《环境科学》
EI
CAS
CSCD
北大核心
2022年第2期928-935,共8页
Environmental Science
关键词
有机脱水剂
污泥脱水
脱水剂性质
影响因素
作用机制
organic dewatering agent
sludge dewatering
dewatering agent property
affecting factors
mechanism