某精细化工企业废水分质处理工艺设计

Process Design of Wastewater Separation Treatment in a Fine Chemical Enterprise

安徽省某大型精细化工企业按照分质处理原则,对有机废水(5 000 m3/d)和无机废水(3 000 m3/d)分别处理。对高浓度难降解有机废水采用IC厌氧+两级AO+芬顿氧化+混凝沉淀处理工艺,试验确定芬顿氧化工艺最佳处理条件为pH值=5,FeSO4投加量为0. 6 g/L,H2O2投加量为13. 48 g/L,COD去除率达到80%以上。无机废水采用调节+中和+混凝沉淀处理工艺。尾水水质达到接管标准后排入工业园区污水厂集中处理。对部分出水进一步采用澄清+过滤+双膜法处理,可达到回用要求。污泥经机械浓缩脱水后焚烧处置。

In the project of wastewater treatment in a large fine chemical enterprise in Anhui Province, according to the separate quality treatment principle, organic wastewater (5 000 m^3/d) and inorganic wastewater (3 000 m^3/d) were treated separately. The combination process of IC anaerobic + two stage AO + Fenton oxidation + coagulation sedimentation was applied to treat the high concentration of refractory organic wastewater. The results showed that the optimal condition of Fenton oxidation process was as follows: pH as 5 , FeSO4 dosage as 0. 6 g/L, H2O2 dosage as 13. 48 g/L. Then COD removal reached more than 80%. The inorganic wastewater was treated by combination process of adjusting + neutralizing + coagulation precipitation. When the terminal effluent quality reached the take-over standard, it was discharged into the wastewater treatment plant of the industrial park for centralized treatment. Part of the effluent was further treated with clarification + filtration + double membrane process to meet the reuse requirements. After mechanically concentrated and dehydrated, sludge was incinerated for disposal.