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为了扩大水源,解决缺水问题,世界各国广泛实行废水回收再利用。大量工业与生活污水经不同程度处理以后再使用,灌溉农田、用于工业、甚至供作生活饮水。资料表明,污水经过处理后,其出水中仍含有多种杂质。如到1975年止已经从美国各城市原水中分离出400余种有机质,经过处理以后的出水仍然含有325种。毫无疑问尚有大量未曾分离出来的化合物。Kraybill(1978)用气相
In order to expand water sources and solve the problem of water shortage, wastewater recycling and reuse is widely practiced in all countries in the world. A large number of industrial and domestic sewage are treated to different degrees and then used, irrigated farmland, used in industry and even used for drinking water. Data show that after the sewage treatment, the effluent still contains a variety of impurities. If more than 400 kinds of organic matter have been separated from the raw water of cities in the United States by 1975, the treated effluent will still contain 325 kinds of effluent. There is no doubt there are a large number of compounds that have not been separated. Kraybill (1978) uses gas phase