通过水循环控制饮用水中亚硝酸盐的研究

以含有亚硝酸盐的自来水为研究对象，稳压泵为动力对水样进行水循环处理，考察循环水和静置水中亚硝酸盐的变化.实验结果表明，循环自来水与静置自来水中亚硝酸盐的质量浓度差值随着时间延长而增加，循环360 h后循环水中亚硝酸盐质量浓度为静置水质量浓度的112%.循环水的亚硝酸盐和硝酸盐之间存在着显著负线性相关性.另外，净水器出水后的循环水和静置水中亚硝酸盐的质量浓度均会增加，但循环水中亚硝酸盐增加量小于静置水中亚硝酸盐增加量，且质量浓度控制在002 mg/L以下.因此，将水循环应用到净水器中可解决出水中存在的亚硝酸盐含量超标的问题，提高水质安全，具有广阔的应用前景.

Mechanism of Water Circulation to Control Nitrite in Domestic Water

Water circulation through stabilized pressure pump was used to reduce nitrite in domestic water, using standing water as a control group. The results show that, the differentials between circulating water and standing water were gradually increased with the time of circulation when the domestic water was circulated by a 50-watt pump. The difference can reach to 112% after 360 h. There is an significant negative linear correlation between nitrite and nitrate in the circulated water. Nitrite was increased when the domestic water was purified by a water purifier, but the increased amount of nitrite in the circulated water is lower than half in the standing water, the concentration can be maintained under 0.02 mg/L. So water circulation is useful to control the problems of nitrite in water purifier and has broad prospects.