Experimental Study on Pretreatment of High Salinity Mine Water by Soften-coagulate
Membrane technology has a good desalination effect in high mineralization mine water that can be reused,but the precipitation contamination caused by Ca2+ and Mg2+ during operation greatly affects the membrane performance.Pre-treatment to reduce hardness and turbidity plays an important role in reducing membrane contamination,improving effluent quality and reducing operating costs.The calcium oxide-sodium metaaluminate softening method coupled with PAC(polyaluminum chloride)coagulation were selected to remove the hardness and turbidity of mine water,and the effects of chemical dosage,reaction time and precipitation time on the removal effect were investigated using single-factor experiments.The optimum conditions were:the dosage of CaO was 30 mg/L,the dosage of NaAlO2 was 15 mg/L,the dosage of PAC was 20 mg/L,the reaction was 60 min,and the precipitation time was 20 min.The total hardness content of the water sample at this time was 56.622 mg/L,with a total hardness removal rate of 46.10%and a turbidity removal rate of 88.86%.The cost of the chemical for the ton of water was 2.4 yuan.
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万方数据
维普
