氢自养还原菌去除实际工业废水中NO3^--N可行性及影响因素研究

Study on the Feasibility and Influence Factors of NO_3^--N Removal by Hydrogen Autotrophic Reducing Bacteria in Actual Industrial Wastewater

针对较高浓度NO_3^--N与SO_2^(4-)的实际工业废水处理较难的问题,考察了摇瓶实验下氢自养菌还原工业废水中NO_3^--N的可行性及其对NO_3^--N与SO_2^(4-)的优先利用级别,探究了进水COD、p H和温度对氢自养还原菌去除NO_3^--N的影响。结果表明,氢自养还原菌能够降解实际废水中NO_3^--N且出水总氮质量浓度达到企业15 mg/L的排放标准;进水SO_2^(4-)质量浓度在2~200 mg/L时NO_3^--N去除率均维持在90%以上,SO_2^(4-)不会抑制NO_3^--N的反硝化过程;氢自养菌还原实际废水中NO_3^--N优化p H和温度范围分别为7.3~8.0和35~40℃,进水中130 mg/L难生物降解有机物不会影响氢自养菌对NO_3^--N的还原能力。

In order to treat actual industrial wastewater with high concentration of NO;-N and SO4^2-, this study investigate the feasibility of NO3^--N removal by hydrogen autotrophic reducing bacteria （HARB） and the order of the priority in using electron donor between NO3^--N and SO2 in actual industrial wastewater, then explore the influence of influent COD, pH and temperature on the removal of NO3^--N by HARB. Results showed that HARB can degrade NO3^--N in the actual industrial wastewater and the total nitrogen concentration of the effluent reaches the emission standard of 15 mg/L. With influent concentration of SO4^2- between＇ 2 and 200 mg/L, the removal rate of NO3^--N remain above 90% and SO4^2- will not inhibit the denitrification of NO3^--N. Optimum pH and temperature of NO3^--N reduction by HARB are 7.3-8.0 and 35-40℃, respectively. Influent non-biodegradable organic compounds of 130 mg/L will not affect the reduction of nitrate by HARB.