利用反硝化抑制硫酸盐还原的连续流试验研究

Continuous-flow Experiment of Denitrification Inhibiting Sulfate Reduction

为控制油田地面系统中硫酸盐还原菌产生硫化物造成设备腐蚀,采用连续流ABR反应器进行了反硝化抑制硫酸盐还原的研究,考察了反硝化抑制硫酸盐还原的影响因素和运行效果。结果表明,SO42-/NO3-值和COD含量是影响反硝化抑制硫酸盐还原的最重要因子,SO42-/NO3-值为1∶1时抑制效果最佳,较低的COD含量有利于提高抑制效果,利用反硝化抑制硫酸盐还原必须在硝酸盐的有效作用区段内进行。氧化还原电位为-50^-150 mV时,反硝化作用占优势地位;氧化还原电位为-300^-400 mV时,硫酸盐还原反应占优势地位。

For controlling equipment erosion caused by sulfide which was produced by SRB in the Daqing Oilfield land system, an experiment of denitrification inhibiting sulfate reduction was conducted in the continuous-flow ABR. Influential factors and running results of denitrification inhibiting sulfate reduction were investigated. The results show that SO4^2-/NO3^- ratio and relative abundance of COD are the most important factors in the process of denitrification inhibiting sulfate reduction. When SO4^2-/NO3^- ratio is 1 ： 1, inhibitory effect is optimal, and lower COD helps to increase inhibitory effect, denitrification inhibiting sulfate reduction must be conducted in the effective acting section of nitrate. When the ORP is between -50 mV and -150 mV, denitrifying bacteria are predominant. However, when the ORP is between -300 mV and -400 mV, sulfate reducing bacteria are predominant.