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人们日常生活用水,一般包括地面水、地下水和自来水。地面水常受到较严重的污染,含有大量的泥砂、细菌、腐植质等不溶性杂质。地下水由于经过地层的过滤,有机质含量大为减少,但无机盐含量较高。自来水是通过净化处理的水,一般杂质特别是不溶性杂质和细菌的含量较低。我国城市饮用水(自来水),绝大部分是以地表水做水源的。由于环境的污染,源水中除普遍含有腐植质外,还含有许多其它种类的有机物。因此需进行沉降、过滤等一系列净水处理过程,尽量除去不
People’s daily water use, including surface water, groundwater and tap water. Surface water is often more serious pollution, contains a lot of sediment, bacteria, humus and other insoluble impurities. Groundwater due to stratigraphic filtration, greatly reduced organic matter content, but higher inorganic salt content. Tap water is water that is treated by decontamination, with lower levels of general impurities, especially insoluble impurities and bacteria. China’s urban drinking water (tap water), the vast majority of surface water to do water. Due to environmental pollution, the source water contains many other kinds of organic matter in addition to the common humus. Therefore need to settle, filter and a series of water purification process, try not to remove