However, the plant of processing and disposal of sludge was abridged, ignored and even left unused in early sewage treatment factory.Thus the state of processing and disposal of sludge was laggard.

• 我国早期的污水处理厂尽可能的简化或忽略污泥处理处置单元，甚至闲置处理设施，致使中国目前的污泥处理处置处于严重滞后状态。