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为了应对水源切换后突发“黄水”的风险,提出对地下水供水区域管段,采用增加消毒剂用量和溶解氧浓度的方式来控制管垢稳定性的技术措施。试验管道中水流状态为白天循环运行,夜晚静止。结果表明,白天循环运行时,未养护管段切换为黄河水源后,出水总铁和浊度在运行15 d之后降至水质标准的规定限值;养护后管段切换水源后,运行5 d后出水总铁<0.3 mg/L,浊度<1 NTU。但隔夜浸泡后的出水仍然出现浊度、总铁较大幅度升高的现象,水源切换期间应加大管网末梢用户用水量,促进管网水的更新速率。地下水供水区域管段提前养护2个月,也只能减小“黄水”的程度,并不能杜绝“黄水”现象的发生。因此黄河水仍需与其他源水调配使用,控制拉森指数,以降低水源切换时突发“黄水”的风险。
In order to deal with the risk of sudden “yellow water” after water source switching, a technical measure was put forward to control the pipe scale stability by adopting the method of increasing the amount of disinfectant and the concentration of dissolved oxygen in the pipe section of groundwater supply. The flow of water in the test pipe is circulated during the day and is still at night. The results showed that the total iron and turbidity of effluent dropped to the limits of the water quality standard after 15 days of operation when the unprotected section was switched to the Yellow River water source during the daytime circulation operation. Iron <0.3 mg / L, Turbidity <1 NTU. However, after overnight soaking, the effluent still showed turbidity and the total iron increased greatly. During the water source switching, the water consumption of the pipe end users should be increased to promote the renewal rate of pipe network water. The maintenance of groundwater supply pipelines in advance for 2 months can only reduce the extent of “yellow water” and can not eliminate the occurrence of “yellow water”. Therefore, the Yellow River water still needs to be used with other source water to control the Larson Index so as to reduce the risk of sudden “yellow water” in the water source switchover.