这类方法在处理过程中产生大量污泥，容易产生二次污染。
This method will create great quantities of dirty mire in the process, easily causing secondary pollution.
好氧生物处理会产生大量的、成分复杂的剩余污泥，如果处置不当容易造成二次污染。
In aerobic wastewater treatment system, large amount of complicated ingredient sludge are formed. If not being disposed properly, the sludge can cause secondary pollution to environment.
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