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目的研究二次供水的卫生状况,以便及时发现问题,及时采取有效措施保障用水安全。方法选取2013-2014年某县的9个街道,作为末梢水监测点,每月取样2次;选择10个居民区二次供水水箱,每月取样2次。选取感官性状、化学指标、细菌学指标、消毒剂指标进行检测,全部合格可判定为合格,如有1项不合格,则判定为不合格。结果管网末梢共检测水样216个,合格率为93.06%;二次供水共检测水样240个,合格率为78.13%;差异有统计学意义(χ2=39.457,P<0.05)。化学指标的相关检测项目,管网末梢水与二次供水的检测合格率均为100.00%。管网末梢共检测合格率中浑浊度、肉眼可见物、锰、细菌总数分别为99.07%、98.15%、97.69%、99.07%。二次供水共检测合格率相关项目分别为96.25%、95.83%、96.67%、94.58%。差异均无统计学意义(P>0.05)。结论二次供水水质比管网末梢差,可能是管理不够、设备管线老化等原因所致,需要多机构协力保障居民用水安全。
Objective To study the health status of secondary water supply in order to detect problems timely and take effective measures in time to ensure the safety of water use. Methods Nine streets of a county from 2013 to 2014 were selected as the peripheral water monitoring points and sampled twice a month. Secondary water supply tanks of 10 residential areas were selected and sampled twice a month. Select sensory traits, chemical indicators, bacteriological indicators, disinfectant indicators for testing, all qualified can be judged as qualified, if one failed, then judged as unqualified. Results A total of 216 water samples were detected at the distal end of the pipe network with a pass rate of 93.06%. A total of 240 water samples were tested with secondary water supply, with a pass rate of 78.13%. The difference was statistically significant (χ2 = 39.457, P <0.05). Test items related to chemical indicators, pipe end of the water and secondary water supply test pass rate was 100.00%. Pipeline endings were detected in the pass rate of turbidity, macroscopic, manganese, total bacteria were 99.07%, 98.15%, 97.69%, 99.07%. The secondary water supply were tested the pass rate of the relevant items were 96.25%, 95.83%, 96.67%, 94.58%. There was no significant difference (P> 0.05). Conclusions The secondary water quality is worse than that of the pipe network. This may be due to insufficient management and equipment pipeline aging, which requires multiple agencies to work together to ensure residents’ water safety.