不同C/N比和碳源种类条件下的SNAD生物膜脱氮性能

The nitrogen removal performance of the SNAD biofilm with different C/N ratios and carbon sources

通过批试实验研究了C/N比和碳源种类对SNAD生物膜厌氧氨氧化耦合反硝化脱氮性能的影响.SNAD生物膜反应器以生活污水为进水,以鲍尔环为生物膜载体,具有良好的SNAD脱氮性能.以乙酸钠为碳源,研究了COD/NO_2^--N比对SNAD生物膜厌氧氨氧化耦合反硝化脱氮性能的影响.随着C0D/NO_2^--N比的增加,厌氧氨氧化亚硝态氮去除量占总亚硝态氮去除量的百分比逐渐减小.C0D/NO_2^--N比分别为1、2、3、4和5实验组对应的厌氧氨氧化亚硝态氮去除量占总亚硝态氮去除量的百分比分别为87.1%、52.2%、29.3%、23.7%和16.3%.当C0D/NO_2^--N比为0~2时,厌氧氨氧化亚硝态氮去除量占总亚硝态氮去除量的百分比大于50%,SNAD生物膜可以实现良好的耦合脱氮.控制C0D/N0_2^--N为5,研究了碳源种类对SNAD生物膜厌氧氨氧化耦合反硝化脱氮性能的影响.以甲酸钠、乙酸钠、丙酸钠和葡萄糖为碳源实验组对应的厌氧氨氧化亚硝态氮去除量占总亚硝态氮去除量的百分比分别为16.3%、37.1%、74.1%和76.8%.当以丙酸钠或葡萄糖为外加碳源并且C0D/NO_2^--N=5时,SNAD生物膜可以实现良好的耦合脱氮.

The effect of carbon sources and chemical oxygen demand(COD)/NO2--N ratios on the anammoxdenitrification coupling process of the simultaneous partial nitrification,anammox and denitrification(SNAD)biofilm was studied in batch tests.The SNAD biofilm reactor was fed with domestic wastewater and filled with Kaldnes rings.During the stable running period,good SNAD performance was achieved.The effect of COD/NO2--N ratios on theanammox-denitrification coupling process was studied with the carbon source of sodium acetate.Consequently,the NO2--N consumption via anammox was found to be reduced with the increase of COD/NO2--N ratio.With the COD/NO2--N ratios of1,2,3,4and5,the corresponding NO2--N consumption via anammox were87.1%,52.2%,29.3%,23.7%and16.3%,respectively.With the COD/NO2--N ranges of0to2,the NO2--N consumption via anammox wasabove50%,which indicated that good nitrogen removal performance was obtained.Besides,the effect of carbon sourceson the anammox-denitrification coupling process was studied with the COD/NO2--N ratio of5.With the carbon sources of sodium formate,sodium acetate,sodium propionate and glucose,the corresponding NO2--N consumption via anammox were16.3%,37.1%,74.1%and76.8%,respectively.The SNAD biofilm could operate good nitrogen removal performance with the carbon sources of sodium propionate or glucose at the COD/NO2--N ratio of5.