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čištění vod odpadních biologické
environ.	生物废水处理 (废水处理的类型，通过生化或细菌作用，使目前的不稳定有机质被氧化和变得稳定。这种类型的例子，是使用间歇性砂过滤器，滴滤池，活性污泥法处理及污泥消化。)