Research on Startup Process and Influencing Factors of Half-nitrosofication in CANON Reactor

摘要

The experimental study on startup process of half-nitrosofication for high ammonia nitrogen simulated wastewater has been accomplished with a reactor of completely autotrophic nitrogen removal over nitrite (CANON). The startup process and its influences of the concentration of influent (NH_4)~+ -N, DO and pH were analyzed with the experimental results. The results show that the conversion rate of (NH)~+ -N to NO_2 -N is close to 55%, the accumulation rate of NO_2 -N is over 95% and the rate of NO_2 -N to NH~+ -N steadily keeps as 1.02～1.24 under the condition of influent (NH)~+ -N of 400 mg/L, pH of 7.6～8.2, DO of 0.95～1.3mg/L, HRT of 1.5d and water temperature of 17～27°C, which meet the environmental requirements for anaerobic ammonia oxidation bacteria growth, and half-nitrosofication was achieved in the CANON reactor, which create good conditions for further enrichment of anammox bacteria for the operation of the CANON reactor.