炼油废水污泥脱水工艺条件的优化

采用化学除油降黏—污泥调理—离心脱水工艺处理某炼油厂废水处理系统的混合污泥，并对工艺条件进行优化。实验结果表明，最佳的工艺条件为：化学除油降黏阶段处理体系的pH=4，反应温度35 ℃，H₂O₂加入量 2 g/L，m（H₂O₂）∶ m（Fe²⁺）=4，反应时间 60 min；污泥调理反应阶段的CaO加入量7.0 g/L；离心脱水阶段在分离因数为1 558时脱水5 min。在此条件下，得到的泥饼的含水率为70.0%~75.0%（w），含油率小于2%（w），污泥比阻约为3.0×10⁷ s²/g。

Optimization of Process Conditions for Refinery Wastewater Sludge Dewatering

The mixed sludge from a refinery wastewater treatment system was treated by the process of chemical oil removing and viscosity reducing - sludge conditioning - centrifugal dewatering,and the process conditions were optimized. The experimental results show that the optimum process conditions are as follows：In chemical oil removing and viscosity reducing stage,the system pH=4,the reaction temperature is 35 ℃,the H₂O₂ dosage is 2 g/L,m(H₂O₂)∶m(Fe²⁺)=4,the reaction time is 60 min；In sludge conditioning stage,the CaO dosage is 7.0 g/L；In centrifugal dewatering stage,the dewatering time is 5 min with 1 558 of separation factor. Under these conditions,the water content and oil content of the mud cake are 70.0%-75.0%(w) and under 2%(w) respectively,the specific resistance of the sludge is about 3.0×10⁷ s²/g.