膜法处理石化废水探索研究

以膜生物反应器(MBR)和膜混凝反应器(MCR)分别处理石化污水厂水解池出水和二沉池出水.结果发现水力停留14.5 h,DO约4 mg/L时,MBR对石化废水的化学需氧量(COD)去除率达到88 %,膜出水COD为71.3 mg/L.以MCR对污水厂出水进行深度处理,发现PAC约10 mg/L为最佳投药量,此时COD去除率达到32 %,膜出水COD为75.6 mg/L.以两种微滤膜反应器出水进行淤泥密度指数(SDI)实验,SDI在3～5之间,可以作为RO进水,但为了RO系统的稳定运行,应进一步对出水进行深度处理.

Study on the Treatment of Petrochemical Wastewater by Membrane Process

Membrane bio-reactor(MBR) and membrane coagulating reactor(MCR) are applied respectively in the treatment of effluent from hydrolysis tank and second sedimentation tank in a petrochemical wastewater treatment plant(WWTP).The results indicate that with HRT of 14.5 h and DO of 4 mg/L,MBR can achieve a COD removal rate of 88 % with effluent COD of 71.3 mg/L.In advanced treatment of effluent of WWTP by MCR,an optimal dosage of 10 mg/L PAC is suggested while a COD removal rate of 32 % and COD of 75.6 mg/L can be reached.The Silt Density Index(SDI) of effluent from two micro-filtration membrane reactor range from 3 to 5,which enables the effluent to be directly used as the influent of Reverse Osmosis(RO) system.But for the stability of RO system,further advanced treatment is suggested.