论文部分内容阅读
为实现N2O的减量化控制或资源化利用,接种普通活性污泥,以乙酸钠和硝酸盐为基质,通过淘洗反硝化聚磷菌,在SBR中以厌氧/缺氧交替运行的方式启动了內源反硝化,单周期内约50%的NO3--N转化为NO2--N,N2O释放速率随着亚硝酸的积累逐渐增大,N2O转化率(释放量占TN去除的比例)为2.04%。在此基础上,分别取缺氧末和厌氧末污泥,对比研究了胞内聚合物PHB合成前后,外碳源投加量(C/N为0,0.75和2.50)对亚硝酸型反硝化过程N2O释放特性的影响,结果表明,外碳源存在时,N2O释放量随总碳源的增加呈略微减少的趋势,转化率在0.24%~1.61%之间;而当仅利用內源物质进行反硝化时,N2O的转化率高达15.90%,最大释放速率达71.29μg·min-1·g-1SS,释放量是其余条件下的14~26倍。表明单独利用PHB进行亚硝酸型反硝化会大幅增加N2O的释放.
In order to realize the reduction control or resource utilization of N2O, common activated sludge was inoculated to sodium acetate and nitrate as matrix, and the denitrifying phosphorus removal phosphorus was eluted in SBR in an anaerobic / anoxic mode Initiates the process of endogenous denitrification. About 50% of NO3 - N is converted to NO2 - N in a single cycle, and the N2O release rate increases with the accumulation of nitrous acid. The conversion of N2O (the proportion of TN released) It is 2.04%. On the basis of this, the hypoxic end and anaerobic end sludge were separately taken and compared before and after the synthesis of the intracellular polymer PHB, the external carbon source dosage (C / N = 0,0.75 and 2.50) Nitration process N2O release characteristics of the results showed that the presence of external carbon sources, N2O release with the total carbon source increased slightly decreased the trend of conversion of 0.24% ~ 1.61%; and when only the use of endogenous substances When denitrifying, the conversion rate of N2O was as high as 15.90% and the maximum release rate was 71.29μg · min-1 · g-1SS, which was 14 ~ 26 times higher than the other conditions. Indicating that nitrite-type denitrification using PHB alone can significantly increase N2O release.