活性污泥-生物膜共生系统处理炼油废水中试研究

摘要

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.%采用复合式活性污泥—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，卍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，在卍字形填料投加率为30%、停留时间为18 h的工况下，试验进水COD为580~779 mg/L、氨氮48.4~70.4 mg/L、石油类14.1~23.6 mg/L时，出水COD<50 mg/L、氨氮＜8 mg/L、石油类＜3 mg/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。