MBBR-超滤工艺在低渗透油田回注水中的应用

Application of MBBR-ultrafiltration technology in re-injection water of low permeability oilfield

关键词:  MBBR超滤  稠油污水  低渗透

Key words:  MBBR  ultrafiltration  heavy oil wastewater  low permeability

摘要:

胜利油田某注水站建立了处理能力为200 m³/d的生化-超滤污水处理流程,处理后用于低渗透油层回注,其中生化工艺采用的是移动床生物膜(MBBR)工艺,超滤采用的管式中空纤维膜。从水质分析、流程启动、初期调试、不同节点水的水质跟踪检测几方面进行了深入研究,从2018年6月投产至今运行正常,超滤压力跨膜压差由0.018 MPa升高到0.028 MPa,污水含油质量浓度由12～659 mg/L降至0.0～0.3 mg/L,悬浮物质量浓度由15～255 mg/L降至0.1～0.3 mg/L,SRB数量由25～60个/mL降至0,粒径中值降至0.86～1.00 μm,COD值由216～505 mg/L降至73～123 mg/L,优于SY/T 5329-2012的一类水指标。 

Abstract:

A 200 m³/d biochemical-ultrafiltration wastewater treatment process was established at a water injection station in Shengli oilfield, which was used for low permeability reservoir reinjection. The biochemical process adopted mobile bed biofilm (MBBR) process with tubular hollow fiber membrane was used for ultrafiltration. The water quality analysis, process start-up, initial debugging and water quality tracking detection of different nodal water were studied in depth. The system was put into operation in June 2018 with a normal operation till now. Through the treatment process, the pressure difference of ultrafiltration across the membrane increased from 0.018 MPa to 0.028 MPa, the oil concentration of sewage decreased from 12-659 mg/L to 0.0-0.3 mg/L, and the concentration of suspended matter decreased from 15-255 mg/L to 0.1-0.3 mg/L. Additionally, the number of SRB decreased from 25-60/mL to 0, the median particle size decreased to 0.86-1.00 μm, and the COD value decreased from 216-505 mg/L to 73-123 mg/L, showing better effects than a class of water of SY/T 5329-2012.