草酸混凝沉淀法处理废水总硬度的应用研究

Study on Total Hardness in Rocessing the Stecl and Iron Water by Applying the Oxalic Acid Coagnlation Precipitation Method

对以使用草酸混凝沉淀法去除钢铁废水中总硬度进行了系统研究，草酸与钙生成沉淀^[1]后，用PAC、PAM作为混凝剂进行絮泥沉淀，对总硬度进行了测定，确定了投加浓度和投加后的pH值。结果表明，混凝沉淀时间为30min，投加浓度为40mg／l，总硬度的去除率达到了16％，随着投加浓度的增加，去除率增高，pH降低。

To by the oxalic acid and the calcium, the magnesium responded that the production calcium oxalate and the magnesium oxalate total hardness has conducted the system research after the coagulation law processing water, after the production precipitation, with PAC, PAM takes the coagulant, has carried on the inspection to total hardness, had determined throws adds the density and the best coagulation condition. The result indicated that when the water leakage pH control in 6-9 scopes, the coagulation precipitation time is 30min, total hardness is when 160mg/l threw adds the density is the 40mg/l. total hardness elimination rate has achieved 20%.