2010—2017年广东省某市市政水厂出厂水三氯甲烷监测结果

Monitoring results of trichloromethane in finished water of municipal water plants of a city in Guangdong Province from 2010-2017

目的了解广东省某市市政水厂出厂水中三氯甲烷浓度,为控制三氯甲烷的污染和改进饮水处理工艺提供科学依据。方法选择2010—2017年广东省某市7个市政水厂为监测对象,参照GB/T 5750-2006《生活饮用水标准检验方法》检测出厂水中三氯甲烷浓度,按照不同水源、不同水厂和不同季度等因素整理数据并分析三氯甲烷浓度的差异。结果广东省某市市政水厂出厂水三氯甲烷的浓度在0.000 8～0.050 0 mg/L,平均浓度为0.012 0 mg/L。7个市政水厂出厂水中三氯甲烷的浓度差异无统计学意义(H=10.967,P>0.05);以XJ、BJ为水源的出厂水中三氯甲烷浓度低于以DJ为水源的出厂水(XJ vs DJ:Z=-2.446,P<0.05;BJ vs DJ:Z=-2.629,P<0.01),差异有统计学意义。第三季度三氯甲烷浓度(0.020 0 mg/L)高于其余3个季度,差异有统计学意义。结论广东省某市市政供水三氯甲烷浓度较低,不同水源的出厂水中三氯甲烷浓度存在差异,且第三季度三氯甲烷浓度最高,提示水厂应根据水源的水质和季节的变化等特征及时调整消毒工艺。

[Objective] To explore the levels of trichloromethane in finished water of municipal water plants of a city in Guangdong Province,provide scientific basis for controlling the contamination of trichloromethane and improving water treatment technology.[Methods] Seven municipal water plants in a city in Guangdong Province from 2010-2017 were selected as monitoring objects. The concentration of trichloromethane in finished water was detected according to the Standard test method for drinking water(GB/T 5750-2006). The differences in trichloromethane concentration among different water sources,different plants,and different seasons were analyzed.[Results]The concentrations of trichloromethane in finished water of municipal water plants of a city in Guangdong Province were 0.000 8-0.050 0 mg/L,with an average of 0.012 0 mg/L. There was no statistically significant difference in concentration of trichloromethane in finished water among seven municipal water plants(H=10.967,P>0.05).The concentration of trichloromethane in finished water from the water plants with XJ and BJ as water sources was lower than that from the water plants with DJ as water source(XJ vs DJ:Z=-2.446,P<0.05;BJ vs DJ:Z=-2.629,P<0.01),and the differences were statistically significant. The concentration of trichloromethane(0.020 0 mg/L) in the third quarter was higher than that of the other three quarters,and the difference was statistically significant.[Conclusion] The concentration of trichloromethane in the municipal water plants of this city is at a low level. The concentrations of trichloromethane are different in water plants with different water sources. In the third quarter,the concentration of trichloromethane is the highest. It is suggested that the water treatment technology should be adjusted according to the water quality of water sources and change of season.