摘要
【目的】水厂常用处理工艺中会产生大量的排泥水,占总进水量的4%~7%,产生的大量排泥水未经处理直接外排至河流,会严重污染水体水质,文中对上海市某水厂新增的排泥水应急装置进行介绍,以及对实际运行效果进行对比,为水厂的排泥水处理提供参考。【方法】本文通过排泥水处理工艺比选、排泥水浓缩技术比选、泥渣脱水技术比选,确定了上海市某水厂新增改造工艺为“高效沉淀浓缩+压滤脱水”,采用滤池反冲洗水和沉淀池排泥水合并处理方式,通过高效沉淀浓缩装置处理可有效降低排泥水中悬浮物(SS)浓度,浓缩后泥渣通过叠螺机和带式压滤机脱水减量后外运处置。【结果】改造后,对水厂进行了1个月的运行监测,经处理的浓缩池上清液SS质量浓度≤30 mg/L,SS去除率≥99%,达到上海市地方污染物排放标准《污水综合排放标准》(DB31/199—2018)二级标准要求,出水排入雨水管网后外排至河流,高效沉淀浓缩后经压滤脱水的泥渣含水率降低至75%以下,污泥减量率达85%以上。【结论】通过对上海市某水厂排泥水处理系统的升级改造,通过“高效沉淀浓缩+叠螺/带式压滤脱水”工艺处理后,可以有效地去除水体的中的SS,通过叠螺/带式压滤后污泥体积减少,且带式压滤运行稳定性显著优于叠螺脱水。药剂费用为0.08万元/d,消耗电费为0.11万元/d,直接运行费用为0.17元/m^(3),经济效益显著。
[Objective]In the common treatment process of water treatment plants(WTPs),a large amount of sludge water is generated,accounting for 4%-7%of the total inflow water,and a large amount of sludge water is directly discharged into rivers without treatment,which will seriously pollute the water quality.This paper introduces the renovation process design of a WTPs in Shanghai,and provides reference for the sludge water treatment of WTPs.[Methods]Through the comparison and selection of sludge water treatment technology,sludge water concentration technology and sludge dewatering technology,the paper determined the renovation process of a WTP in Shanghai—"high efficiency sedimentation concentration+cascade/belt filter press dewatering",the filter backwashing water and sedimentation tank sludge water combined treatment,through the high efficiency sedimentation concentration device can effectively reduce the concentration of suspended solids in sludge discharge water,concentrated sludge through the cascade machine and belt filter press dewatering and reducing volume after external disposal.[Results]After the reconstruction,the operation of the WTP was monitored for 1 month.The suspended solid(SS)of the treated supernatant of the mass concentration pool was≤30 mg/L,and the SS removal rate was≥99%,which met the requirements of the secondary standard of the Intergrated Wastewater Discharge Standard(DB31/199—2018)of Shanghai local pollutant discharge standard.The outflow was discharged into the stormwater pipe network and then discharged to the river.After high efficiency precipitation and concentration,the moisture content of the sludge dehydrated by press filtration could be reduced to less than 75%,and the reduction rate of sludge could reach more than 85%.[Conclusion]After upgrading the sludge discharge water treatment system of a WTP in Shanghai,the suspended matter in the water body can be effectively removed by the process of"high efficiency sedimentation concentration+spiral/belt press filtration dehydration",and the sludge volume can be reduced by spiral/belt press filtration,and the operational stability of the belt press is significantly better than that of the spiral dewatering.The chemical cost is 0.08 million yuan/day,the electricity consumption is 0.11 million yuan/day,and the direct operating cost of water is 0.17 yuan/ton of water,with significant economic benefits.
作者
阮燕霞
杨文文
李郭军
魏宏斌
张艳
唐秀华
刘霞
RUAN Yanxia;YANG Wenwen;LI Guojun;WEI Hongbin;ZHANG Yan;TANG Xiuhua;LIU Xia(Shanghai Zhongyao Environmental Protection Industry Co.,Ltd.,Shanghai 200092,China;Shanghai Shenyao Environmental Protection Engineering Co.,Ltd.,Shanghai 200092,China;College of Environmental Science and Engineering,Tongji University,Shanghai 200092,China;Shanghai Chengtou Water<Group>Co.,Ltd.,Water Production Branch,Shanghai 200231,China)
出处
《净水技术》
2025年第12期198-205,共8页
Water Purification Technology
关键词
排泥水处理
高效沉淀浓缩
泥渣脱水
叠螺脱水
带式压滤
sludge discharge water treatment
efficient sedimentation concentration
sludge dewatering
spiral dewatering
belt filter press
