常规水处理混凝沉淀工艺中除浊与除铝的相关性研究

Correlation between turbidity and aluminium in conventional water treatment

饮用水中铝的来源广泛,对人体健康构成危害.首先通过实验证明了水中的铝主要以颗粒形态存在,常规水处理混凝沉淀工艺能大幅度降低水体中铝的含量;进而以实验的方法对混凝剂种类、投药量、pH值和温度等的影响进行分析,发现上述因素对除浊和除铝都有重要影响,浊度与铝的去除有较强相关性,但除铝对工艺条件的要求比除浊更严格;通过优化、强化常规水处理工艺,在选择混凝剂品种和混凝条件时兼顾除浊和除铝的要求,对生产过程实施有效的监控调节,使出水残余铝达到水质标准的要求是可行的.

Aluminium in drinking water has detrimental effect on human health .Bench-scale experiments indi-cated that conventional drinking water treatmen t processes,such as coagulation and sedimentation,could sig-nificantly reduc e residual aluminium in colloid form in water.The effect of a type of coagulant and its dosage,pH and temperature etc.were further investigated.It was foun d that they had pronounced impact on the removal of turbidity and aluminium that had good correlation.However,the requirements for removing aluminium are more stringent than those for turbidity.By choosing a suitable type of coagulant and the optimum conditions for removal of aluminium and turbidity,the conventi onal treatment process can be optimized.Therefore,it is feasi-ble to control the contents of residual aluminium to satisfy the standards for drinking water quality.