DONG Yijun, WANG Shuying, ZHANG Yukun, et al. Biological treatment of high concentration NO2--N in passivation washing wastewater and process control strategy[J]. CIESC Journal, 2014, (8): 3164-3169. DOI: 10.3969/j.issn.0438-1157.2014.08.043.
DONG Yijun, WANG Shuying, ZHANG Yukun, et al. Biological treatment of high concentration NO2--N in passivation washing wastewater and process control strategy[J]. CIESC Journal, 2014, (8): 3164-3169. DOI: 10.3969/j.issn.0438-1157.2014.08.043.DOI:
Biological treatment of high concentration NO2--N in passivation washing wastewater is difficult. In this paper nitrite oxidizing bacteria (NOB) was enriched by feeding NO2--N wastewater
NOB-rich activated sludge was used in an SBR system to treat simulated passivation washing wastewater
and a process control strategy was put forward. The results showed that using the process passivation washing wastewater with NO2--N concentration 2000 mg·L-1 could be totally oxidized within 300 min. The nitrite oxidation process was not inhibited by the high NO2--N concentration. Furthermore
this process had a correlation with the variation of DO concentration during reaction. DO-MSC
a parameter of the process control strategy
indicated the end of the reaction when it was more than 0.02. The results of batch tests showed that the DO-MSC could indicate the end of the nitrite oxidation process both in different aeration rates(0.02-0.125 m3·h-1) and different temperature(15-30℃).