基于磁混凝的溢流污染削减工艺优化研究  

Optimization of magnetic coagulation process for overflow pollution control

作　　者：孙铸宇 崔冰洁 蔡雨瑶 张莹 王盼 SUN Zhuyu;CUI Bingjie;CAI Yuyao;ZHANG Ying;WANG Pan(College of Environmental Science and Engineering,Donghua University,Shanghai 201620,China;Shanghai Municipal Engineering Design Institute(Group)Co.,Ltd.,Shanghai 200092,China)

机构地区：[1]东华大学环境科学与工程学院,上海201620 [2]上海市政工程设计研究总院(集团)有限公司,上海200092

出　　处：《环境工程》2025年第1期144-154,共11页Environmental Engineering

基　　金：上海市浦江人才计划(21PJ1422100);上海市社会发展科技攻关项目(21DZ1202600);上海市高新技术领域项目(21511103701)。

摘　　要：排水系统溢流污染问题已成为制约我国城市水环境质量改善的关键因素,研究探索了磁混凝工艺用于溢流污染削减的可行性,并进行了工艺参数优化。结果表明,经优化后的磁混凝条件为:PAC、PAM、磁粉投加量分别为100,1.00,100 mg/L,磁粉为300目,投加顺序为磁粉-PAC-PAM。最佳工况下,出水COD、TP平均浓度分别为(12±8.83),(0.03±0.03) mg/L,均可达到GB 3838—2002《地表水质量标准》中Ⅲ类水标准。通过数据分析发现,COD、浊度、SS、TP的去除率间呈显著正相关。此外,基于进水SS浓度变化建立了调整药剂投加量的经验公式,可应对实际应用中复杂多变的水质。研究结果为溢流污水的就地快速净化提供了重要借鉴。In recent years,overflow pollution from municipal drainage systems has become a critical issue that affects the improvement of the urban water environment in many Chinese cities.The causes of overflow pollution are complex,with the main sources including combined sewer overflows,diverted sewage connections,stormwater runoff pollution,and pipe network sediments.In order to ameliorate the overflow pollution problem within a short period,the use of rainwater storage facilities in conjunction with in-situ purification at pumping stations is a feasible means.This study explored the feasibility of the magnetic coagulation process for overflow pollution reduction and carried out the optimization of process parameters.The results showed that the optimum magnetic coagulation conditions were:coagulant polyaluminum chloride(PAC),coagulation aid polyacrylic amide(PAM),and magnetic powder with dosages of 100,1.00 and 100 mg/L,respectively;with the size of magnetic powder at 300 mesh and the optimum dosing order of magnetic powder-PAC-PAM.Under the optimum conditions,the average concentrations of COD and TP in the effluent of overflow wastewater after magnetic coagulation treatment were 12±8.83 and 0.03±0.03 mg/L,complying with China’s Surface Water Quality Standard:ClassⅢ.Meanwhile,it was found that there was a significant positive correlation between the removal of COD,turbidity,SS and TP,where a high SS contribution can be a representative indicator.Therefore,the empirical equation for adjusting the dosage of chemicals was established based on the variation of SS concentration in the influent,which can cope with the complex and variable influent water quality in practical applications.This study can provide a reference for in-situ purification of overflow pollution.

关 键 词：排水系统 溢流污染 就地处理 磁混凝 污染削减 

分 类 号：X703[环境科学与工程—环境工程]