zhang太太
The wastewater system relies on the force of gravity to move sewage from your home to the treatment plant. So wastewater-treatment plants are located on low ground, often near a river into which treated water can be released. If the plant is built above the ground level, the wastewater has to be pumped up to the aeration tanks (item 3). From here on, gravity takes over to move the wastewater through the treatment process.
80年代之后
水处理: 1. water treatment2. water curing3. treatment of the water4. aqueous processing. Examples: 公共卫生方面的严重问题与该城低效率的污水处理系统有关。 The grave problem of public hygiene is connected with the inefficient sewage system of the city.
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