油田含油污水达标外排生物处理影响因素研究

STUDY ON FACTORS AFFECTING BIOLOGICAL TREATMENT OF OILY SEWAGE FROM OIL FIELDS

建立一体化生物处理反应器,采用自然富集挂膜方式培养微生物处理油田含油污水。考察主要影响因素温度、HRT、矿化度、有机负荷、生物填料性能等对反应器处理效能的影响。结果表明,通过此种方式挂膜、驯化成功的微生物可以适应油田含油污水高温高矿化度的水质特点。纤维球填料体系在水温45～65℃、HRT为10h、矿化度为15000mg/L、COD有机负荷在0.38～0.49kg/(m3.d)、油含量在22.1～78.3mg/L时处理效果较为理想,出水COD及油含量均值分别达到67.9、3.6mg/L,满足国家《污水综合排放标准》(GB8978-1996)一级排放标准。

Integrative reactor filled with bio-membrane cultured and enriched spontaneously was employed to dispose oily wastewater from oil field.The main influencing factors are investigated in experiments,such as temperature,HRT,mineralization,COD volumetric load and packing material.Experiment results show that the microorganisms cultured and enriched using this method can endure high temperature and high mineralization.The ideal effluent can be achieved under the temperature 45～65℃,HRT 10 h,COD volumetric load 0.38～0.49 kg/(m3·d),oil concentration 22.1～78.3 mg/L and mineralization 15 000 mg/L,respectively.Study shows the average concentration of COD and oil in disposed wastewater is reduced to 67.9 mg/L and 3.6 mg/L respectively,which could meet the first-order of Integrated Wastewater Discharge Standard(GB8978-1996).