Initial nitrite concentration promote nitrite-oxidizing bacteria activity recovery from transient anoxia: Experimental and modeling investigations.

Wenlong Liu, Chao Liu, Shujun Zhang, Pengchao Gu, Chen Shen, Wei Wang, Yongzhen Peng

Journal: Bioresource technology 2019;289():121711

PMID: 31323722

Full Text on Elsevier Science View on PubMed

Abstract

Transient anoxia due to the periodic anoxic/aerobic operation is beneficial for the nitrite-oxidizing bacteria (NOB) suppression. A continuous reactor of modified University of Cape Town process treating municipal wastewater was equipped with alternating anoxic/aerobic zones to maintain nitritation. Higher nitrite accumulation ratio in the oxic zones was achieved through transient anoxia and shorter aerobic actual hydraulic retention time (15 min), but it steeply deteriorated from above 95.0% to 21.0% after elevated temperature (25 °C). Batch experiments indicated that the existence of initial nitrite at the starting of aerobic phase promoted the recovery of NOB activity from transient anoxia and inhibited the activity of ammonium-oxidizing bacteria. Furthermore, a supplemental modeling further confirmed that the specific growth rates of NOB (μ) decreased at the anoxic phase and the recovery extent of μ after anoxic exposure have a positive correlation with the initial concentrations of nitrite, leading to the failure of maintaining nitritation.

Address: State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China.; National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.; Beijing Drainage Group Co. Ltd (BDG), Beijing 100022, PR China.; College of Civil and Architectural Engineering, Heilongjiang Institute of Technology, Harbin 150050, China.; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, PR China; National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China. Electronic address: [email protected].

DOI: 10.1016/j.biortech.2019.121711

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MeSH Terms: Ammonium Compounds, Bacteria, Bioreactors, Nitrites, Wastewater