摘要
以SBBR单级自养脱氮系统的污泥为对象,采用不同的人工模拟废水为反应器进水,通过批式试验的方式研究了单级自养脱氮系统内的中间产物及氮素平衡情况,并探讨了氨氮的去除途径.结果表明,以仅含氨氮的人工模拟废水为进水,在未投加有机碳源的条件下,系统内62%的氨氮被转化为NO2-、NO3-、NH2OH、N2H4、NO、NO2、N2O和N2等一系列氮化合物,其中N2占90.07%.单级自养脱氮系统内的氨氮是由多种途径去除的.4.5%的氨氮是在吹脱等物化作用下去除的,不超过3.73%的氨氮是通过传统的硝化反硝化途径去除的,53.77%的氨氮是由自养脱氮途径去除的,自养脱氮反应起主要的脱氮作用,且自养脱氮反应可以通过2条代谢途径来实现.但在足够NO2存在并且缺氧的条件下,单级自养脱氮系统内的出水氨氮浓度与空白反应器相当,NH4+并没有被亚硝化单胞菌以NO2为电子受体氧化为NO2-和N2等化合物而得以去除,可能是因为系统内不存在该类型的亚硝化功能菌.
Different synthetic wastewaters were used in the batch tests to analyze the intermediate products and the nitrogen balance, and to study the mechanism of ammonium removal in the completely autotrophic nitrogen removal in one reactor process with the sludge cultured in the SBBR completely autotrophic nitrogen removal system. The results showed that 62% of ammonium was converted to such nitrogen compounds as NO2^- , NO3^- , NH2OH, N2H4, NO, NO2 , N2O and N2 without addition of organic carbon, and N2 took up 90.07 %. The ammonium in the completely autotrophic nitrogen removal in one reactor system was removed in many ways. 4.5 % of ammonium was removed in the physicalchemical way. 3.73% of ammonium was converted by the conventional nitrification-denitrification process. The quantity of ammonium removed by the completely autotrophic nitrogen removal in one reactor process was 53.77% , which is the largest, and the completely autotrophic nitrogen removal in one reactor process could be realized in two different metabolic pathways. But the effluent ammonium in the anoxic reactor, where enough NO2 present were present, was equal to the blank system, and no ammonium was converted to such nitrogen compounds as NO2^- and N2 by Nitrosomonas eutropha using NO2 as electron acceptor, which maybe caused by lack of the function bacteria.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2009年第1期102-107,共6页
Environmental Science
基金
国家自然科学基金项目(50608071)
教育部科学技术研究重大项目(308020)
重庆大学研究生创新项目(200801A1A0180277)
关键词
单级自养脱氮
氨氮
途径
厌氧氨氧化
硝化反硝化
completely autotrophic nitrogen removal in one reactor
ammonium
metabolic pathway
anaerobic ammonium oxidation （ANAMMOX）
nitrification-denitrification
