工业循环水倒流污染自来水引起食物中毒较为罕见。1992年10月19日长葛县和尚桥镇桥南村第二村民组,发生一起因工业循环水倒流污染自来水造成64人中毒的重大食物中毒事件。现报告如下:一、发病经过该村民组位居县化肥厂边沿,已食用该厂3号井供给的自来水10余年,该水系供软化池用水管道上的分支,未发生过类似事件。此次中突然停机,值班人员没及时关闭阀门,使含亚硝酸盐的循环水倒 Industrial circulating water pollution caused by tap water poisoning is more rare. On October 19, 1992, there was a major food poisoning incident in which 64 people were poisoned by tap water from industrial circulating water in the second villager group of Qiaonan Village, He Shangqiao, Changge County. The report is as follows: First, the incidence of the village group led by the county fertilizer plant edge, has consumed the plant No. 3 wells to supply tap water for more than 10 years, the water system for softening pool water pipe branches, there have been no similar incidents. Suddenly shut down this time, the duty did not promptly shut down the valve so that circulating water containing nitrite down