组合工艺处理难降解化工废水的试验研究

Experimental Study on Treatment of Refractory Chemical Wastewater by Combined Processes

浙江嘉兴某化工企业为提标改造污水处理设施,对该企业产生的含叔丁醇废水进行试验研究。采用生化工艺与深度处理相结合的方式进行试验,生化段采用好氧-水解酸化-好氧-MBR工艺处理该废水,结果显示,该工艺能有效去除COD,在水力停留时间为75 h时,出水COD为348.2 mg·L^(-1)。其中水解酸化能有效提升废水可生化性,强化了废水中有机物的去除能力。深度处理阶段采用芬顿、臭氧氧化以及反渗透工艺进行试验,结果显示芬顿与臭氧氧化工艺对该废水处理效果较差,反渗透工艺能有效处理该废水,出水COD降至11.4 mg·L^(-1),电导率为246.7μS·cm^(-1),达到回用水标准GB/T 19923—2005。该工艺适用于工程提标改造,可为实际工程改造提供技术支持。

A chemical enterprise in Jiaxing,Zhejiang Province conducted experimental research on the wastewater containing tert butanol produced by the enterprise in order to upgrade its wastewater treatment facilities.The experiment was conducted using a combination of biochemical process and advanced treatment.The biochemical section used the aerobic-hydrolysis acidification-aerobic-MBR process to treat the wastewater.The results showed that the process could effectively remove COD,and the effluent COD was 348.2 mg·L^(-1) when the hydraulic retention time was 75 h.Hydrolysis acidification could effectively improve the biodegradability of wastewater and enhance the removal ability of organic compounds in wastewater.In the advanced treatment stage,Fenton,ozone oxidation,and reverse osmosis processes were used for experiments.The results showed that Fenton and ozone oxidation processes had poor treatment effects on the wastewater.The reverse osmosis process could effectively treat the wastewater,with COD in the effluent reduced to 11.4 mg·L^(-1) and conductivity of 246.7μS·cm^(-1),meeting the reuse water standard GB/T 19923—2005.This process is suitable for engineering standard upgrading and can provide technical support for actual engineering renovation.