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天然气输送过程中,通常注入乙二醇,以抑制水合物产生。由于回收时分离不完全,部分乙二醇与产出水混合,形成高浓度乙二醇气田废水。对于这类废水的处理,现有方法实际应用效果均不理想,在文献调研和分析的基础上,提出采用厌氧生化法处理。试验采用自行设计的厌氧生化反应器,整个试验过程依次为厌氧微生物适应阶段、提高负荷阶段、稳定运行阶段。试验结果显示:厌氧活性污泥对乙二醇气田废水的适应期为3d,经过20d的连续提高负荷,使最终负荷达到约12kg COD/(m3·d),稳定运行阶段进水COD浓度为13000mg/L,HRT控制在24h,稳定运行后出水COD在1000mg/L以下;进水COD浓度高于10000mg/L时,提高其p H值到7.4~7.5,可以保证厌氧效果不受影响。这表明,厌氧生化法处理含高浓度乙二醇气田废水是可行的。
In natural gas delivery, ethylene glycol is usually injected to suppress hydrate production. Due to incomplete separation during recovery, part of ethylene glycol is mixed with produced water to form high-concentration ethylene glycol gas field wastewater. For the treatment of this kind of wastewater, the actual application results of the existing methods are not ideal. On the basis of literature research and analysis, it is proposed to adopt anaerobic biochemical treatment. The experiment adopts an anaerobic biochemical reactor designed by itself. The whole testing process is followed by anaerobic microorganism adaptation stage, which improves the load stage and stabilizes the operation stage. The results showed that the anaerobic activated sludge could adapt to ethylene glycol wastewater for three days, and the final load reached about 12 kg COD / (m3 · d) after 20 days of continuous increase. The influent COD concentration in steady operation was 13000mg / L, HRT control in 24h, stable operation effluent COD below 1000mg / L; influent COD concentration higher than 10000mg / L, increase its p H value to 7.4 ~ 7.5, can ensure that the anaerobic effect is not affected. This shows that anaerobic biochemical treatment of wastewater containing high concentrations of ethylene glycol gas is feasible.