【摘要】 向钢铁冶金高浊废水中复配投加聚合氯化铝和膨润土,以浊度、CODCr的去除率为指标,通过对投加顺序、pH值、投加量、温度、搅拌速度、搅拌时间、原水浊度等因素的考察,确定合适的工艺条件。结果表明:在pH值为12,搅拌速度为200r/min,搅拌20min的条件下,先投加膨润土,后投加聚合氯化铝,膨润土和聚合氯化铝投加量分别为150和5mg/L,对于CODCr值在180～220mg/L范围内、浊度为9250～9480NTU范围内的钢铁高浊度废水,CODCr去除率可达80%以上,浊度去除率达到99.9%以上。处理效果优于膨润土和聚合氯化铝单独投加,且具有良好的经济性,为钢铁冶金废水的处理提供一种新思路,具有实际生产意义。更多还原

【Abstract】 Compound coagulant polyaluminium chloride (PAC) and bentonite is used to dispose the high turbidity steel wastewater, and with the removal rate of turbidity, CODCr as the index, the related factors are determined, such as the dosing sequence, the pH value, the dosage, the temperature, the stirring rate, the stirring time, the raw water turbidity, and appropriate process conditions. Through a large number of trials, the results show that in the appropriate condition, the pH value is 12, the stirring intensity is 200r/min, for 20min, the dosing sequence is first bentonite and then PAC, bentonite and PAC dosages are 150 and 5mg/L, respectively, raw water CODCr between 180 and 220mg/L, turbidity range is 9250～9480NTU, the removal rate of turbidity, CODCr, can reach 80% and 99.9%, respectively. The treatment effect with the compounded coagulant is better than bentonite and PAC being used alone, and compared with other treatment methods, this treatment has a good economical efficiency and provides a new treatment for the steel wastewater.更多还原