Application of air flotation process in the reuse of tailwater in waterworks
In the process of providing safe and high-quality production water and domestic drinking water,a certain amount of tail water will be produced in the waterworks,resulting in the waste of water resources,so recycling this part of tail water has important value and significance.In this paper,the tail water of the waterworks mainly consists of sludge discharge water of the sed-imentation tank and backwash water of the sand filter.After adjustment and concentration,the su-pernatant is treated by the air flotation process,the turbidity removal rate is 90%,the permanga-nate index removal rate is 43%,the SS is<5 mg/L,and the direct operating cost is 0.076 CNY/m3.After air flotation treatment,the tail water of the waterworks is recycled to the sand filter,which reduces the self-use water rate of the waterworks and provides an effective way to save ener-gy and reduce consumption and realize zero discharge of the tail water.