饮用水源突发性铬污染去除方法的比较研究

通过对水源水中铬污染的不同去除方法的比较实验及验证实验,研究pH值、FeSO_4、NaHSO_3和活性炭的投加量对铬的去除效果的影响。实验结果表明,当原水中铬的含量为0.5 mg/L时,未调节pH值的条件下,亚硫酸氢钠与活性炭对铬的最高去除率为50%左右;硫酸亚铁还原沉淀在FeSO_4·7H_2O:Cr~(6+)投加比=16:1时,滤后出水中Cr~(6+)的去除率达到96.8%,中试出水中未检出Cr~(6+),出水的总Cr、总Fe等指标完全达到《生活饮用水卫生标准》(GB 5749-2006)的要求。

Comparative study on elimination methods for unexpected chromiumpollution in drinking water sources

Through the lab and pilot-scale experiments of different measures on the removal of chromium in dringking water sources, the effects of pH value, oxidant of FeSO_4、NaHSO_3 and active carbon on the chromium removal were studied. The results showed that, when the mass concentration of chromium in raw water was 0.5 mg/L,the removal rate of chromium with NaHSO_3 and active carbon was 50% ; the removal rate of chromium was 96.8% in lab experiment and 100% by the process of pilot-scale when the ratio of FeSO_4 · 7H_2O to Cr~(6+) was 16:1 , and the concentration of total chromium, total iron satisfied the requirement of Hygienic Standard for Drinking Water (GB 5749-2006).