活性污泥—生物膜共生系统处理炼油废水中试研究

Pilot study on the treatment of refinery wastewater using the activated sludge-biofilm symbiotic system

采用复合式活性污泥一生物膜共生系统进行炼油废水有机物和氨氮处理的中试研究，形字形嵌套填料形成的生物膜系统可高效去除COD和氨氮，利用前置排泥技术可消除石油类对微生物的影响。研究表明，在趟字形填料投加率为30％、停留时间为18h的工况下，试验进水COD为580～779mg／L、氨氮48．4～70．4mg／L、石油类14．1～23．6mg／L时，出水COD〈50mg／L、氨氮〈8mg／L、石油类〈3mg／L，挥发酚及硫化物去除率也在60％以上。与传统活性污泥法相比，系统内污泥浓度提高了2倍以上。

The pilot study on the treatment of organic matter and ammonia nitrogen in refinery wastewater using the multiplex activated sludge-biofilm symbiotic system has been carried out. The COD and ammonia nitrogen can efficiently be removed by the biofilm system formed with the 卍-shaped nesting packing,while the influence of petroleum on micro-bacteria can be eliminated by the pre-sludge removing technology. The results show that under the following conditions：the 卍-shaped packing dosing rate is 30%, retention time 18 h,influent COD 580-779 mg/L, ammonia nitrogen 48.4-70.4 mg/L, and petroleum 14.1-23.6 mg/L, the effluent COD is 〈50 mg/L, ammonia nitrogen 〈8 mg/L, petroleum〈3 mg/L, volatile phenol and sulfide removing rates are both more than 60%. Compared with the conventional activated sludge process, the sludge concentration in the system has increased by twice or more.