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New progress in wastewater treatment technology for standard-reaching discharge in sour gas fields

机译：酸性气田达标排放废水处理技术的新进展

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Gas field water is generally characterized by complex contaminant components and high salinity. Its proper treatment has always been the great concern in the field of environmental protection of oil & gas fields. In this paper, the wastewater from a gas field in the Sichuan Basin with high salinity and more contaminants (e.g. sulfides) was treated as a case study for the standard-reaching discharge. Lab experiments were carried out to analyze the adaptability and effectiveness of coagulation–desulfurization composite treatment technology, chemical oxidation based ammonia nitrogen removal technology and cryogenic multi-efficacy distillation technology in the treatment of wastewater in this field. The results show that the removal rate of sulfides and oils is over 90% if polymeric ferric sulfate (PFS) is taken as the coagulant combined with TS-1 desulfurization agent. Besides, the removal rate of ammonia nitrogen is over 96% if CA-1 is taken as the oxidant. Finally, after the gas field water is treated by means of cryogenic three-efficacy distillation technology, chloride concentration of distilled water is below 150?mg/L and CODcrconcentration is less than 60?mg/L. It is concluded that after the whole process treatment, the main contaminant indicators of wastewater in this case study can satisfy the grade one standard specified in the Integrated Wastewater Discharge Standard (GB 8978–1996) and the chloride concentration can meet the requirement of the Standards for Irrigation Water Quality (GB 5084–2005). To sum up, the above mentioned composite technologies are efficient to the wastewater treatment in sour gas fields.
机译：气田水通常以复杂的污染物成分和高盐度为特征。对其的正确处理一直是油气田环境保护领域中的高度关注。本文以四川盆地某气田含盐量较高，污染物（如硫化物）较多的废水作为达标排放的案例研究。进行了实验室实验，以分析混凝-脱硫复合处理技术，基于化学氧化的氨氮去除技术和低温多效蒸馏技术在该领域的适应性和有效性。结果表明，如果以聚合硫酸铁（PFS）为凝结剂与TS-1脱硫剂结合使用，硫化物和油脂的去除率可达到90％以上。另外，以CA-1为氧化剂，氨氮去除率超过96％。最后，通过低温三效蒸馏技术处理气田水后，蒸馏水的氯化物浓度低于150？mg / L，CODcr浓度低于60？mg / L。结论是：本次案例研究处理后的废水主要污染物指标可以满足《污水综合排放标准》（GB 8978-1996）中规定的一级标准，氯化物浓度可以满足本标准的要求。灌溉水质量（GB 5084–2005）。综上所述，上述复合技术对酸性气田废水处理是有效的。

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