Sustainable Mining and Metallurgy

When dealing with low temperature, high turbidity and high alkali water in a water plant in Xinjiang, there were problems of difficult settlement of alum flower and high turbidity of effluent, and high energy consumption and operation cost. In this paper, from the perspective of strengthening the coagulation effect of the process, PAFC and PACS were obtained by compounding iron salt and aluminum sulfate with PAC respectively. PAFC and PACS were used as coagulants for water treatment experiments, and anionic coagulant PAM was added .The effect of compound coagulants on the treatment of low temperature, high turbidity and high alkali water was studied. The experimental results show that when the dosage of PAFC and PACS is 50mg/L, the turbidity of the effluent is reduced to 7.3NTU and 1.58NTU respectively, which meets the requirements of the water plant. After the addition of anionic coagulant PAM, especially the use of drinking water level PACS with anionic PAM, the effluent turbidity decreased to 0.34NTU. Using drinking water level PACS or PACS+anionic PAM to treat low temperature, high turbidity and high alkali raw water, the drug consumption can be reduced by 37.5%,and the amount of bleaching powder can be reduced by 40%, achieving the goal of saving energy and reducing operating costs.