按污水处理程度不同，污水处理可分为一级处理、二级处理和三级处理。
污水处理过程产出大量污泥。
对污水处理过程运行状态的分类实验表明该方法的有效性。
Numerical experiments for classifying operation state of wastewater treatment processes show that th.
活性污泥法是污水处理过程的一种有效的方法，得到广泛的研究和应用。
Activated sludge method is an effective method for the wastewater treatment and has been widely applied and studied.
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