With HRT=6 h and influent COD increased gradually,particle sludge was tamed then effluent pH and COD removal rate was heading for stability 20 days after the operation.

• 在水力停留时间(HRT)6 h,进水COD逐渐提高的情况下对颗粒污泥进行驯化,20 d后pH、COD去除率趋于稳定。