碳源对低氧多级AO工艺脱氮性能及N2O释放的影响  

Effect of Carbon Source on Nitrogen Removal and N_2O Emission in the Low Oxygen Multiple Anoxic and Aerobic Process

作　　者：邢丽贞[1] 欧丽英 孔进[1] 王宁[1] 吴光学[2] 

机构地区：[1]山东省绿色建筑协同创新中心,山东建筑大学市政与环境工程学院,山东济南250101 [2]清华大学深圳研究生院,深圳市环境微生物利用与安全控制重点实验室,广东深圳518055

出　　处：《水处理技术》2016年第6期36-41,46,共7页Technology of Water Treatment

基　　金：深圳市引进海外高层次人才“孔雀计划”项目(KQCX20120814155347053);山东省绿色建筑协同创新中心团队建设项目(LSXT201508)

摘　　要：以乙酸钠和丙酸钠为外加碳源,考察了碳源种类和碳氮比对多级AO工艺(分别为反应器SBR-A和SBR-P)脱氮性能及其N_2O释放的影响。结果表明,在进水COD为200 mg/L时,SBR-A和SBR-P氮去除率分别为66.7%和67.1%,磷去除率分别为51.1%和28.9%。硝化过程中,SBR-A中NH4+-N氧化速度和NO_3^--N生成速度都比SBR-P高,SBR-A中NO_2^--N和N_2O积累速度比SBR-P低。2组反应器硝化过程中N_2O释放因子均小于0.23%。在反硝化过程中,SBR-A的反硝化速度高于SBR-P,N_2O释放因子均较低;存在同时释磷时,对SBR-A的反硝化速度影响较小,而对SBR-P反硝化活性影响较大,后者反硝化速度明显低于无释磷条件下的反硝化速度;菌群均以变形菌门和拟杆菌门为主,且以陶厄氏菌属、脱氯单胞菌属、蛭弧菌属和硝化螺菌属等为主要功能菌。With acetate（SBR-A） and propionate（SBR-P） as external carbon sources, in the low organic carbon wastewater, effects of types of carbon sources and the ratio of carbon to nitrogen on nitrogen removal and N2O emission were investigated in the multiple anoxic and aerobic processes, which were SBR-A and SBR-P reactors respectively. The results showed that, with the influent COD of 200 mg/L, nitrogen removal percentages in the SBR-A and SBR-P were 66.7% and 67.1%, respectively and phosphate removal percentages were 51.1% and 28.9%, respectively. During nitrification, the NH4＋-N oxidation rate and NO3---N generation rate in the SBR-A were higher than that in the SBR-P reactor, while NO2---N and N2O accumulation rates in the SBR-A were lower than that in the SBR-P. N2O emission factor in both reactors was less than 0.23% during nitrification. While in the process of denitrification,the denitrification rate in the SBR-A reactor was higher than that in the SBR-P, and the N2O emission factor was relatively low in both reactors. Concurrent with the release of phosphorus, little effect occurred on the denitrification rate in SBR-A, while a high influence occurred on the SBR-P with a lower rate than that without the release of phosphorus. The dominate bacteria in a phylum level were Proteobacteria and Bacteroidetes in both reactors, and in the genus level, the functional bacteria were Thauera, Dechloromonas, Bdellovibrio and Nitrospiraetc.

关 键 词：多级AO工艺 碳氮比 脱氮 N2O 微生物种群 

分 类 号：X703.1[环境科学与工程—环境工程]