焦化废水除盐深度处理试验研究

分别采用同步和分步条件试验,考察反应时间和加药量对高碱石灰铝盐法去除氯离子的影响。分步处理效果优于同步处理,反应时间可控制在45 min+45 min。随着加药量的增加,氯离子和硫酸根离子的去除效果明显改善,最佳条件下氯离子的去除率达到66%,出水氯离子浓度低于350mg/L,满足循环冷却水的水质要求。对硫酸根离子去除效果更为明显,去除率可达到90%,出水硫酸根离子浓度低于25 mg/L。经处理后,出水中钙离子浓度、镁离子浓度和硬度等均低于0.05 mg/L。出水指标均达到循环冷却水的水质标准要求。

Experimental study on further treatment of coking wastewater with desalination

The influence of reaction time and reagent adding on removal of chlorine iron with high-alkaline lime aluminum salt method were investigated by experiment under synchronous and step-by-step conditions.The effect of step-by-step treatment is superior to synchronous treatment s,and the reaction time can be controlled in 45min+45min.As increasing of reagent addition,the removal effect of chlorine iron and sulfate ion improved obviously,the removal rate of chlorine iron is up to 66%under optimal conditions,the concentration of chlorine iron in effluent was below 350mg/L,which met the requirements of water quality for recirculated cooling water. The removal effect of sulfate ion was more obvious,the removal rate reached 90%,the concentration of sulfate iron in effluent was below 25mg/L.The calcium ion concentration,magnesium iron concentration and stiffness were all below 0.05mg/L after treatment.The effluent indicator met requirement of water quality standard for recirculated cooling water.