Fenton氧化法深度处理元坝气田低温蒸馏站成品水试验

Advanced Treatment of Finished Water in Low Temperature Distillation Station of Yuanba Gas Field by Fenton Oxidation Process

元坝气田采出水经低温蒸馏站处理后的成品水CODcr指标超出了回用标准,对成品水中有机污染物采用荧光光谱和GC/MS两种方法进行分析表明,元坝气田采出水及低温蒸馏站成品水中有机污染物均为苯胺。为此,采用Fenton氧化法对成品水进行深度处理,现场试验结果表明:pH值、H2O2与CODcr质量比、H2O2与Fe^2+摩尔比是影响Fenton氧化效果的主要因素;在进水CODcr质量浓度为840mg/L时,控制反应条件pH值在2.5~3之间;H2O2与CODcr质量比为7∶1,H2O2与Fe2+摩尔比为10∶1,出水CODcr质量浓度为60mg/L以下,达到回用标准。工程实施后,元坝气田采出水完全实现回用,Fenton氧化工艺效果稳定,每天可节约清水600m3,节水及环保效益显著。

The CODcr index of finished water treated by low temperature distillation station in YuanbaGas Field exceeds the reuse standard. The organic pollutants in the finished water are analyzed by fluorescence spectroscopy and GC/MS. The results show that the organic pollutants in produced water and finished water of low temperature distillation station are aniline. The Fenton oxidation process was used to treat the finished water. The field test results showed that pH value, the mass ratio of H2O2 to CODcr and the molar ratio of H2O2/Fe^2 + were the main factors affecting Fenton oxidation. When the influent CODcr was 840 mg/L, the pH value of reaction condition was controlled between 2.5-3, the mass ratio of H2O2 to CODcr was 7∶ 1,H2O2/Fe^2 + molar ratio was 10∶ 1, and tthe effluent CODcr could reach below 60 mg/L and meet the reuse standard. After the implementation of the project, the produced water in Yuanba Gas Field has been fully reused. The Fenton oxidation process has a stable effect, the CODcr index of the effluent fully meets the reuse standard, and the clean water can be saved by 600 m3 per day. The water- saving and environmental protection benefits are remarkable.