污泥厌氧水解与短程硝化反硝化耦合工艺处理低碳氮比城市污水

Nitrogen Removal Efficiency of a Shortcut Nitrification-Denitrification Process Integrated with Sludge Anaerobic Hydrolysis for Treating Low C/N Ratio Municipal Wastewater

为处理低碳氮比城市污水，在30-35℃、不调节pH值（7．01-8．33）的条件下，通过人为添加氨氮控制游离氨浓度（25mg·L^-1），在SBR中6d内成功启动了短程硝化反硝化。对比实验结果表明，短程硝化反硝化在处理低C／N比城市污水时的总氮脱除效果要优于传统的全程硝化反硝化，当反应器运行稳定后，溶解氧的浓度和高游离氨不再是影响NO2-N浓度累积的主要因素，NO2-N／NOx^--N始终保持在80％以上。为了进一步提高短程硝化反硝化的脱氮效率，利用污泥厌氧水解产物替代10％进水，为反硝化阶段提供附加的部分碳源，两工艺联合后处理效果良好，出水TN平均浓度和去除率分别为13．39mg·L^-1和74．9％，出水水质符合排放标准的要求。

In order to achieve nitrogen removal in treating municipal wastewater with low C/N ratio, a shortcut nitrifieation-denitrification process was successfully developed in a sequencing batch reactor （SBR） in 6 days with the operation conditions of working at 30-35℃, without pH control （7.01-8.33） and maintaining a high concentration of free ammonia （FA, 25 mg·L-1） by adding NH4＋-N. The experiment results show that the total nitrogen removal efficiency of shortcut nitrification-denitrification is superior to that of the traditional nitrifieation-denitrification in treating municipal wastewater with low C/N ratio. It was also found that dissolved oxygen （DO） and FA do not affect accumulation of NO2--N when the operation is stabilized, and the NO2--N/NOx--N ratio could be maintained over 80%. In order to enhance the nitrogen removal efficiency of the shortcut nitrifieation-denitrifieation, 10% of SBR influent is replaced with the products of sludge anaerobic hydrolysis for supplying extra part of the carbon sources for denitrification. The total nitrogen removal efficiency of the combined process is 74.9%. The total nitrogen concentration in the effluent is 13.39 mg·L-1, which meets the quality requirement of the discharge standards.