城镇自来水厂平流沉淀池改造技术与实践

当前国内部分自来水厂的平流沉淀池由于建设时间较久,工艺设备使用寿命达限,普遍存在产水量低、出水浊度高、排泥含水率高、投药量大的问题,以及排泥设备老化带来的运行安全、运行效能下降问题,亟需进行优化改造,以提高净水效能。佛山市沙口水厂在原有平流沉淀池的基础上,对虹吸式排泥车、配水花墙、集水槽、导流墙进行了相应的技术改造及优化,通过本次改造,使得4#沉淀池排泥含固率稳定在3.0%以上;与尚未改造的3#池相比,在相同出水浊度的条件下,单池出水量提高30%,投药量下降3 mg/L,极大地提高了处理效率,降低了运行成本。

Renovation Technology and Practice of Horizontal Flow Sedimentation Tank in Urban Waterworks

Since the horizontal flow sedimentation tanks in some domestic waterworks have been constructed for a long time,it is common that the equipment have reached service life,and the process has low water yield,high effluent turbidity,high water content of discharge sludge,large dosages,and decline of operation safety and operational efficiency caused by the aging of sludge discharge equipment.Based on the original horizontal flow sedimentation tank,Foshan Shakou Waterworks has carried out technical renovation and optimization on the siphon sludge scraper,inlet wall,decanting trough,and diversion wall.After that,the solid content of discharge sludge from the No.4 sedimentation tank was stable above 3.0%.Compared with the unmodified No.3 tank at the same effluent turbidity,the water yield was increased by 30%,the dosage was reduced by 3 mg/L,which greatly improved the treatment efficiency and reduced operating costs.