[Pilot test on oil field wastewater biotreatment with thermophilic microorganisms]

The thermophilic microorganisms (50-60 degrees C) 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 CODCr 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 degrees C, CODCr 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 CODCr in the effluents of flocculating process can reduce to 136-229mg/L. And CODCr 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.