嗜热微生物处理油田外排水中试研究

Pilot Test on Oil Field Wastewater Biotreatment with Thermophilic Microorganisms

应用嗜热微生物 (5 0～ 6 0℃ ) ,采用接触氧化工艺处理油田高温外排水 ,解决了应用常规生物处理降温的难题 .中试结果表明 :在进水水温 6 0～ 6 5℃ ,CODCr30 0～ 5 90mg/L ,水质波动较大条件下 ,调整HRT 8～ 1 8h ,可使系统出水CODCr稳定在 1 75～ 2 6 3mg/L ,含油量低于 1 0mg/L .辅以后絮凝处理 ,可将生化出水中的悬浮物以及残留色度污染物有效絮凝沉降 ,混凝沉淀出水CODCr可降低至 1 36～ 2 2 9mg/L .再经砂滤活性炭装置过滤 ,CODCr可降至 1 5 0mg/L以下 .中试试验还表明 ,在高温条件下 。

The thermophilic microorganisms (50～60℃) are introduced and the contact oxidation technology is adopted to treat with the high temperature effluents from an oil field in this paper, which solves a problem that the effluents need to be cooled in routine biotreatment. The results of the pilot test show that the HRT of the biotreatment system adjusted to 8～18h can make COD Cr of the effluents stable at 175～263mg/L and oil content under 10mg/L on condition that the temperature of the influents keeps at 60～65℃, COD Cr 300～590mg/L and the quality of the oil wastewater is greatly fluctuant. Flocculating process, then, can effectively flocculate and precipitate the suspending and residual chroma pollutant from the effluents of biotreatment and COD Cr in the effluents of flocculating process can reduce to 136～229mg/L. And COD Cr even reduces to under 150mg/L after flowing by sand and activated carbon filtration equipments. Under the high temperature condition, furthermore, combined stuffing is an ideal carrier for the thermophilic microorganisms.