摘 要:本研究将改性超滤膜与离子分离膜联用对含聚采油废水进行脱盐处理，结果表明,改性超滤膜不仅抗污染能力强，而且能有效去除水中的原油、悬浮物和聚合物等杂质,保证后续离子分离膜的稳定运行；使用经离子分离交换膜脱盐后的采油废水配制的聚合物，粘度高，抗剪切性能好，可以代替自来水用于现场配制聚合物溶液。本研究为油田聚驱采油废水的回用开辟了新的途径。
关键词:
含聚采油废水;改性超滤膜;离子交换膜;脱盐；聚合物；回用
Membrane
/Desalination Technology for Oilfield Wastewater Treatment
YU
Shuili1, WANG
Beifu1, ZHAO
Qing
(1. School of Municipal and Environmental
Engineering, Harbin Institute of Technology,
Harbin
150090, China)
Abstract:
A combine process of modified ultrafiltration membrane and ion-exchange membrane
was introduced for desalination of oilfield wastewater with polymer. The results
indicated that modified ultrafiltration membrane had strong antipollution ability, could efficiently remove the crude oil,
suspend solids and polymer in the wastewater, but also ensured the after
ion-exchange membrane system ran steadily. The desalted oilfield wastewater
could confect high viscosity
polymer solution that it would become a substitute for tap water on-site. The
research opened up a new way for
oilfield
wastewater reclamation.
Key
words: oilfield wastewater with polymer; ultrafiiltration membrane; ion-exchange
membrane; desalination; polymer; reclamation
1.处理装置及试验方法
1.1处理装置
超滤膜采用哈尔滨工业大学改性超滤膜,其材质为PVDF,截留分子质量为120
ku,具有抗油、聚合物污染的性能。离子交换膜为3361和3362型异相阴阳离子交换膜,阳膜面电阻< 12
Ω
·c m2 ,阴膜面电阻<
15Ω·c m2, 电极材料为钛涂钌。改性超滤膜设备进水量20 m3/h，产水量为16.5 m3/h，产水率82%；离子交换膜设备进水量16.5 m3/h，产水量为12.5 m3/h，产水率75%产水量。试验装置如图1所示.
1.2实验地点及工艺流程
试验地点为大庆采油公司聚南八污水处理站，该污水站现采用自然沉降、混凝沉降、两次压力过滤处理工艺
,处理水回注到高渗透地层。本研究拟将该处理水进行脱盐，然后用脱盐水配制聚合物。采用的工艺如图2所示。将经过两级沉降、两级过滤的水，先进行超滤膜进行预处理,然后进入离子交换膜装置脱盐。
