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1、低质给水产生的背景和原因低质给水是指饮食用水以外的各种用水。它产生的背景和原因有两个。第一,城市人口的高度集中,人们对卫生的要求越高,每人每天的用水量不断上升,工业用水也与日俱增,现有的水资源将不能满足需要。因此,用低质给水来减少现有给水所需耗去的水资源,乃是一种十分有效的方法。第二,为了避免水质日益下降的水源进一步污染,对城市污水进行高度净化的要求越来越迫切。经高度净化后的污水用作厕所冲洗是完全可能的,水质上也是允许的。
1. Background and Causes of Low-quality Water Supply Low-quality water supply refers to various types of water other than water for food and drink. It has two backgrounds and reasons. First, the high concentration of urban population, the higher the people’s demand for health, the daily water consumption of each person is rising, and the industrial water consumption is also increasing. The existing water resources will not be able to meet the needs. Therefore, the use of low quality water to reduce the water resources consumed by the existing water supply is a very effective method. Second, in order to avoid further contamination of water sources with declining water quality, the requirements for highly purifying urban sewage are becoming more and more urgent. The use of highly purified sewage for flushing toilets is entirely possible and water quality is also permissible.