EGSB反应器在微氧条件下的运行特性

Performance characteristic of the EGSB reactor in the microaerobic conditions

对EGSB反应器在微氧和厌氧条件下的运行特性进行了对比实验研究,分析了EGSB反应器在微氧条件下高效稳定运行的可行性.研究结果表明,适量氧的加入提高了EGSB反应器的COD去除率,明显降低了出水VFA浓度.对于427mg·L-1、869mg·L-1、1796mg·L-1、3123mg·L-1的进水COD浓度,与厌氧时相比,微氧时COD去除率的增幅和出水VFA浓度的降幅分别为4.0%、4.2%、3.9%、1.1%和43%、40%、46%、18%;适量氧的加入并没有对甲烷菌产生毒害作用;氧化还原电位是微氧EGSB反应器更为理想的运行控制参数,一般在-380～-400mV之间;微氧EGSB反应器具有很强的抗pH冲击、负荷冲击和温度冲击能力.

In order to analyze the feasibility of the highly efficiently and stable operation of the EGSB reactor at the microaerobic condition, The performance characteristic of the EGSB reactor at the anaerobic and microaerobic conditions was investigated in this paper. The results showed that Supplement of limited oxygen could increase the COD removal efficiency and decrease the effluent VFA concentration. For the influent COD of 427,869, 1796 and 3123 mg· L^-1 , the increased percentage of the COD removal efficiency and the decreased percentage of the effluent VFA concentration are 4.0% ,4.2% ,3.9% ,1. 1% and 43% ,40% ,46% ,18% ,respectively. Supplement of low level oxygen wasn＇t harmful to the methanogens. The oxidation - reduction potential （ORP） is the more optimal control parameter for the EGSB reactor performance, which normally has the values of - 380 - -400 inV. The microaerobic EGSB reactor had very strong ability of resisting pH. temperature and loads shock.