Research on Softening Treatment of Reverse Osmosis Concentrate of Domestic Waste Leachate with High Hardness and High Alkalinity
Domestic waste incineration power plant leachate reverse osmosis concentrate in the high concentration of organic matter,high hardness,complex composition,the depth of the treatment is easy to be scaled in the internal equipment and clogging equipment.In view of the water quality characteristics of the concentrate,the combination of"aeration+NaOH"method of hardness removal is adopted to study the main factors and r elevant parameters of aeration and NaOH chemicals on the removal of alkalinity and hardness of leachate.The results show that the optimal parameters of this method are:gas and water ratio of 14∶1,aeration time of 60 min,pH value of 7.0,NaOH dosage of 5 mg/L;verified by the engineering test,the total hardness removal rate reaches 95%,which reduces the cost by 64.8%compared with the traditional hardness removal method.
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