膜生物反应器处理聚驱采油废水研究

摘要

The lab-scale experiments were carried to treat oilfield polymer flooding produced wastewater by membrane bioreactor (MBR) in the condition of no sludge discharge. Taking the oil content, COD, hydrolyzed poly-acryamide (HPAM) content as pollutant index,the effects of hydraulic retention time (HRT), temperature, dissolved oxygen (DO) on the removal efficiency of wastewater in the MBR were studied. The results showed that the treatment efficiency of wastewater reach the best when HRT was 10 h, temperature was 30℃ and DO was 2. 0~4. 0 mg/L. Under the optimum condition, the average removal rate of oil content, COD and HPAM content of membrane effluent water was 96. 7%, 78. 9% and 75. 0%, respectively. Simultaneously, the average removal rate of suspended solid was above 98. 8% when MBR had been operated for 30 d. Furthermore, the median particle size of membrane effluent was up to the Al class water-feeding standards stipulated by recommending indexes for water quality of water feeding in class rock (SY/T 5329-94).%以聚驱采油废水为处理对象,在不排泥情况下采用膜生物反应器(MBR)对此类废水进行处理.以含油量、COD和水解聚丙烯酰胺(HPAM)为污染物处理指标,分别考察了MBR的水力停留时间(HRT)、温度、溶解氧(DO)对MBR处理效果的影响.试验结果表明,MBR处理聚驱采油废水的最佳条件为:HRT 10 h,温度30℃,DO 2.0～4.0 mg/L,此时,膜出水中含油量平均去除率为96.7％,COD平均去除率为78.9％,HPAM平均去除率为75.0％.在最佳条件下连续运行30 d,MBR内悬浮物平均去除率可达98.8％以上,且膜出水悬浮物粒径中值达到《碎屑岩油藏注水水质推荐指标及分析方法》(SY/T 5329-94)中A1级回注水的规定值,聚驱采油废水得到理想的处理.