富氧条件流离反应器内好氧反硝化特征

Aerobic denitrification characteristics of a flow-separation reactor under oxygenrich environment

基于连续流A/O流离生物膜反应器内同步硝化反硝化的研究结果,以流离生物膜内菌群为整体研究对象,在富氧条件下,对依赖不同氮源生存的细菌的活性、以及具有的反硝化特征进行了研究.研究结果表明,温度25~30℃、溶解氧4.0~6.0 mg·L-1条件下,低碳氮比废水在硝化菌和好氧反硝化菌共同作用下,总氮和氨氮浓度稳步下降,亚硝酸盐和硝酸盐在试验持续时间内无明显积累现象.再分别以硝酸盐氮和亚硝酸盐氮为氮源,在高温（〉40℃）条件下18 h内即被完全去除,证明流离生物膜内的好氧反硝化菌脱氮效果好,且对高温水环境耐受力强.相对于单一菌群的反硝化研究,以多种细菌整体为研究对象的试验研究具备实际应用的可能性.

Based on simultaneous nitrification and denitrification（ SND） in a continuous anoxic / aerobic flow-separation biofilm system,the influence of different nitrogen sources on functional bacteria and aerobic denitrification characteristics in oxygen-rich condition were studied. The results show that the concentrations for total nitrogen and ammonia nitrogen were gradually decreasing,while nitrite or nitrate were not accumulated during the process under 25- 30 ℃ together with a high dissolved oxygen concentration（ 4. 0 ~ 6. 0 mg·L- 1）. Both nitrification and aerobic denitrification were achieved in the wastewater with a low C / N ratio. In addition,nitrite and nitrate as main nitrogen sources were respectively used to confirm the function of aerobic denitrifier. The results show the removal efficiency of nitrite and nitrate within 18 h under high temperature（ 40 ℃） was nearly 100%. Therefore,the aerobic denitrifier in aerobic flow-separation biofilm was proved to effectively remove ammonium from different nitrogenous effluents,while it could adapt to high temperature environment. Comparing with the pure cultures,the functional flora as object was more superior in engineering practice.