Abstract：Three groups of reactors of the same specification, respectively referred to as R1(operation mode of continuous flow with low dissolved oxygen and low substrate), R2(operation mode of SBR), R3(alternate operation mode of continuous flow and SBR) were set up to investigate the nitrite nitrogen accumulation, pollutant removal, sludge characteristics, and EPS secretion during the operation period. The start-up time for partial nitrification in the R1was 28days, and the NAR was maintained at 49.6%, with a gradual decrease in ammonia removal and nitrite concentration. R2 achieved partial nitrification in 12days, and the NAR was maintained at 95.6%, but it was reduced to 82.6% due to a decrease in bacterial activity by prolonged FA inhibition. It took 18days for R3 to achieve partial nitrification, then R3 was operated for 90d, with a NAR of 92.3% in the SBR stage and 90.2% in the continuous flow stage. The ratio of NO2--N/ NH4+-N in the effluent of R3was basically between 1.10and 1.22, and the sludge had a relatively dense structure, the SVI was between the optimal threshold 70and 100mL/g, the EPS content reached 54.63mg/gVSS, the SAOR and SNPR were 6.7 and 2.5mgN/(gMLVSS⋅h), respectively. The above research indicates that the alternate operation strategy of sequential batch and continuous flow can effectively elute NOB while ensuring functional bacteria such as AOB, achieving stable accumulation of nitrite.
李冬, 毛中新, 李明润, 王沁源, 胡丽君. 序批式与连续流交替运行的短程硝化启动研究[J]. 中国环境科学, 2023, 43(7): 3438-3446.
LI Dong, MAO Zhong-xin, LI Ming-run, WANG Qin-yuan, HU Li-jun. Partial nitrification start-up study running alternately between sequential batch and continuous flow. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(7): 3438-3446.
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