“氯-粉末炭”强化处理河北水源水的研究

Enhanced Treatment Combined with Chlorine and Powered Activated Carbon(Cl_2/PAC) for Hebei Emergency Raw Water Source

为了考察北京市现行预处理工艺对河北应急水源的处理效果,同时确定相应的控藻/蚤除嗅处理参数,试验组在河北黄壁庄水库进行了系列中试试验研究。试验结果表明:为了达到较好的杀蚤效果需要保持水中余氯大于0.9 mg/L;对中试工艺的监测结果表明,煤滤池后即无剑水蚤和藻类检出;预氯化后煤滤池出水也存在着三卤甲烷(THMs)实测值与限值之比超过1的风险,但炭出水水质可以满足对消毒副产物的要求;较优的除嗅方案为"氯2.0 mg/L(接触12 min),粉末炭20 mg/L(接触60～90 min),混凝剂投量15 mg/L";考虑到藻类和剑水蚤在煤滤池反冲洗水中的富集,故建议在高藻/蚤期,不建议煤滤池反冲洗水回收再利用。

To study pre-treatment（C12/PAC） effect of Hebei emergency raw water source and the operation parameters for controlling alga and cyclops, pilot scale tests were carried out in Hebei province using Huangbizhuang reservoir raw water source. The results show that residual chlorine should be above 0.9 mg/L; there are neither cyclops nor alga in filter effluent; the ratio of trihalomethans （THMs） in the filter effluent to that of their limit values of the national standard are greater than l, however, THMs in GAC effluent comply with the national standard. The preferable technical parameter for controlling smell and odor are： Cl2 （2.0 mg/L with 12 min contact time）＋PAC （20 mg/L with 60-90 min contact time）＋coagulant （15 mg/L）. In order to avoid the enrichment of alga and cyclops in filter backwash water, filter backwashing water are not suggested to reuse.