摘要
城市水厂在净水过程中产生的大量排泥废水,不仅影响水厂的正常运行,还会对生态环境卫生造成较大威胁。为探索一种经济高效的排泥水絮凝沉降技术,试验取上海市某水厂沉淀池排泥水进行自然沉降试验,探究微砂增效阳离子型聚丙烯酰胺(CPAM)絮凝处理对排泥水沉降性能及其固体通量的影响规律。结果表明:低浓度排泥水的自然沉降速率较大,静沉固体通量高,当到达压密点后沉降速率变小,沉降曲线发生明显变化;随着排泥水浓度增加,自然沉降速率减小,但具有较大的向下流排泥固体通量。单独投加CPAM对于高浓度排泥水沉降性的改善作用有限,而采用60%微砂增效1.0 mg CPAM/g絮凝处理对低、高浓度排泥水的沉降性均具有良好的促进效果,并产生较高的总固体通量,是一种高效的絮凝浓缩技术。该试验结果为水厂排泥水的高效絮凝处理提供了重要参考。
Plenty of sludge water is discharged from the process of water purification in urban water treatment plant(WTP),which can not only affect the normal operation of water plant,but also pose a greater threat to the eco-environmental sanitation.In order to explore a cost-effective flocculation precipitation technology for sludge water treatment,the natural settling experiment was conducted by taking sludge water from the sedimentation tank in a WTP in Shanghai City to investigate the effect of microsand enhanced cationic polyacrylamide(CPAM)flocculation treatment on the precipitation performance of sludge water and its solid flux.The results indicated that the natural settling rate of low-concentration sludge water was large,with high static sedimentation solid flux,and then became small when it reached the pressure-tightening point,resulting in a significant change in the setling curve.As the concentration of sludge water increased,the natural settling rate decreased,with a large downstream discharge solid flux.The addition of CPAM alone had a limited effect on the settleability of high-concentration sludge water,while the addition of 60%microsand enhanced 1.0 mg CPAM/g flocculation treatment showed a good effect on the settlement of low/high-concentration sludge water,and produced a high total solid flux.The study result provides an important reference for the efficient flocculation treatment of sludge water in WTP.
作者
郭智刚
刘正雄
肖曦彬
吴振元
都正良
柴晓利
GUO Zhigang;LIU Zhengxiong;XIAO Xibin;WU Zhenyuan;DU Zhengliang;CHAI Xiaoli(Shenzhen Municipal Group Co.,Ltd.,Shenzhen 518131,China;College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China)
出处
《净水技术》
CAS
2024年第S02期29-34,共6页
Water Purification Technology
基金
国家自然科学基金面上项目(51978495)。
