同步硝化反硝化过程中污染物的去除及温室气体的释放

采用缺氧-好氧SBR反应器,研究了同步硝化反硝化(SND)工艺污水生物脱氮过程中污染物去除效果和温室气体(N2O,CH4和CO2)的释放情况.结果表明,与顺序式硝化反硝化工艺(SQND)的总氮去除率63.78%相比,SND大大地提高了总氮的去除,去除率达90.39%.同时,SND过程刺激了温室气体的释放,其温室气体释放总量为SQND的4.5倍.SND反应器N2O每周期释放量为34.28 mg,且主要集中于曝气阶段.而SQND过程N2O释放量仅为6.89mg,为SND过程的1/5.SND过程和SQND过程,每周期CO2的释放量分别为493.52,320.28mg.两反应器中CH4的释放量都很低,接近于零.

Greenhouse gases emissions and pollutants removal during simultaneous nitrification and denitrification process

Investigations on greenhouse gases (GHGs) emissions and pollutant removal performance during simultaneous nitrification and denitrification (SND) process were conducted in anoxic-oxic sequencing batch reactors. Total nitrogen removal rate of SND process was 90.39%, significantly higher than that of sequential nitrification and denitrification (SQND) process, which was 63.78%. SND process enhanced GHGs emissions. The total GHGs emissions during per SND cycle were about 4.5 times higher than that during per SQND cycle. About 34.28 mg nitrous oxide (N2O) was produced per SND cycle, almost 5 times higher than that during SQND process, which was 6.89 mg N2O per cycle. N2O emission was mainly occurred during the oxic phase in both processes. The carbon dioxide (CO2) emission from SND and SQND processes was 493.52 and 320.28 mg per cycle, respectively.And both processes showed a near-zero methane (CH4) emission.