摘要
受污染河道吸入式水力疏浚泥浆经离心脱水可减量为易于运输与消纳的泥饼 ,但离心上清液含有以颗粒物为主的高质量分数的污染物 .为提供对上清液的有效净化工艺 ,通过实验研究 ,探索了最适混凝参数、旋流接触澄清过程的操作参数以及澄清—砂滤—超滤组合工艺的澄清效果 .实验结果显示 :依次加入聚合氯化铝(PAC) 10 0mg·L-1,聚丙烯酰胺 (PAM ) 30mg·L-1,双调理混凝能有效澄清颗粒物 ;双调理混凝旋流接触澄清在水力停留时间 2 5min时能有效去除离心上清液中的颗粒物 ;旋流澄清尾水经砂滤可达污水排放二级标准 ,再经超滤可达作生活杂用水的回用水质要求 .
Centrifugal dewatering can greatly reduce the volume of the hydraulically dredged slurry from contaminated water body,and the produced dewatered sludge cakes are environmentally acceptable and economical for transportation and disposal.But the centrate has high concentration of pollutants,which are mainly in the form of particulate matters.In order to search out an effective process to treat the centrate,the following researches were conducted:analyzing the optimal operational parameters of coagulation and helical-flow sludge blanket contact clarification process,and evaluating the decontamination performance of the coagulation-clarification-sand filtration-ultrafiltration process.It is concluded:① feeding of PAC followed by PAM with dosages of 100 mg·L -1 and 30 mg·L -1 respectively has satisfactory flocculation performance;② helical-flow sludge blanket contact clarification can effectively remove particulate matters from the centrate,which is flocculated by PAC and PAM with a hydraulic retention time of 25 minutes;③ through coagulation-helical-flow sludge blanket contact clarification-sand filtration process,the effluent quality can meet the requirements of Class Ⅱ of Integrated Wastewater Discharge Standard(GB 8978-1996) of China,and the effluent from further ultrafiltration process can meet the Water Quality Standard for Non-potable Use(CJ 25.1-89) of China.
出处
《同济大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2002年第7期881-885,共5页
Journal of Tongji University:Natural Science
