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采用“生物接触氧化-微滤-超滤-反渗透”作为油田采出水处理工艺,试验考察了处理工艺对降低污水石油类物质、TOC、浊度、脱盐率、粒径、悬浮物等指标的效果。结果表明,当HRT为6～8 h时,生化出水石油类物质、TOC的质量浓度分别由处理前的5～15 mg/L和45～55 mg/L下降到处理后的0.6～0.8 mg/L和18～20 mg/L;生化出水再经微滤-超滤工艺处理后,出水石油类物质的质量浓度小于0.3 mg/L,浊度小于0.15 NTU,污染指数小于3.0,悬浮物粒径D50小于1.0μm,悬浮物的质量浓度小于1.0 mg/L。超滤出水水质不仅达到SY/T 5329-2012的A1级标准,而且达到反渗透进水要求;反渗透脱盐率98%以上,可满足SY/T 0097-2000规定的给水水质条件。
Using “biological contact oxidation - microfiltration - ultrafiltration - reverse osmosis” as the oilfield production water treatment process, the experimental study of the treatment process to reduce the sewage petroleum substances, TOC, turbidity, desalination rate, particle size, suspended solids, etc. The effect of the indicator. The results showed that when HRT was 6-8 h, the mass concentration of biochemical effluent petroleum and TOC decreased from 5-15 mg / L and 45-55 mg / L before treatment to 0.6-0.8 mg / L and 18 ~ 20 mg / L respectively. After the biochemical effluent was treated by microfiltration and ultrafiltration, the mass concentration of effluent petroleum was less than 0.3 mg / L, the turbidity was less than 0.15 NTU, the pollution index was less than 3.0, the particle size of suspended solids D50 less than 1.0μm, the mass concentration of suspended matter less than 1.0 mg / L. The ultrafiltration effluent quality not only meets the A1 grade standard of SY / T 5329-2012, but also meets the requirements of reverse osmosis water infiltration. The reverse osmosis desalination rate is over 98%, which can meet the water quality conditions stipulated in SY / T 0097-2000.