地下水是自然环境的组成部分，人类活动会导致地下水质的变化。
Groundwater is a part of nature environment. Mans activity can impact the quality of groundwater.
方法对医院污水进行生物氧化及臭氧消毒处理，观察水质的变化情况。
MethodsBy using biological oxidation and ozone disinfection for the treated sewage of hospital, effects on quality of the sewage were investigated.
掌握城市污水在回用于循环冷却水过程中水质的变化规律对于城市污水回用意义重大。
It's important for the municipal sewage reusing to grasp the change of the water quality in the course of the municipal sewage reusing as circulating cooling water.
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