Start-up of partial denitrification and characteristics of nitrite accumulation by multiple factors
MAO Pei-yue1,2,3, FU Xue1,2,3, ZHAO Xin-lei1,2,3, XING Jia-wei1,2,3, MA Jiao1,2,3, CHEN Yong-zhi1,2,3
1. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China; 2. Technical Center of Sewage Treatment Industry in Gansu, Lanzhou 730070, China; 3. Key laboratory of Yellow River Water Environment in Gansu Province, Lanzhou 730070, China
Abstract:Partial denitrification SBR reactors of R1, R2 and R3 were used to inoculate with anaerobic (S-A), aerobic (S-O) and alternate anaerobic/aerobic (S-A/O) activated sludge as seed sludge respectively which cultivated in our laboratory for a long time. When the influent C/N ratio was 3 and the anoxic stirring time was 1h, the nitrite accumulation rate (NAR) of the R1, R2, and R3 reactors reached 75.34%, 84.51% and 86.23% on the 15th, 7th and 4th day, respectively. Four factors and three levels response surface method experiments were conducted on NAR with C/N ratios, initial pH, anoxic stirring time and initial NO3--N concentration. The results of variance analysis showed that the above factors had significant effects on NAR (P<0.05), and R2 of model was 0.983. The optimal operating conditions were predicted by the model as follows:C/N ratio was 3, initial pH was 8.51, anoxic stirring time was 1.25h, and initial NO3--N concentration was 60mg/L, NAR was as high as 91.3%.
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