Simultaneous nitrification and denitrification in membrane bioreactor: Effect of dissolved oxygen

Huang, Rui; Meng, Tongyang; Liu, Gaige; Gao, Shanshan; Tian, Jiayu

doi:10.1016/j.jenvman.2022.116183

Cited by 27 publications

(2 citation statements)

References 45 publications

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“…In addition, Proteobacteria, being facultative or obligate anaerobic heterotrophs, thrive in the biofilm microenvironment with low DO concentrations caused by solid mass transfer resistance. Previous research has indicated the significant role of Proteobacteria, especially β-Proteobacteria, in denitrification and phosphorus removal processes in wastewater treatment, with certain strains directly involved in denitrification [24].…”

Section: Study On Microbial Population Structurementioning

confidence: 99%

“…The advancement of molecular biology and the refinement of mathematical models have led to further exploration of BNR processes, resulting in the proposal of new theories and the development of numerous BNR processes by researchers. For instance, some microorganisms can perform denitrification under aerobic conditions [6], and nitrification and denitrification can occur simultaneously within the aerobic environment of the same reactor [7]. Furthermore, NH 4 + -N has been found to react with nitrate (NO 3 --N) or nitrite (NO 2 --N) to produce nitrogen in an anoxic environment [8].…”

Section: Introductionmentioning

confidence: 99%

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Mechanism of Nitrogen Removal Enhancement in Low Carbon/Nitrogen Municipal Sewage by AAO Process with Activated Sludge-Biofilm Composite System

Rong,

Zhang,

Sun

et al. 2024

Pol. J. Environ. Stud.

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To address the issue of insufficient carbon sources in urban sewage, which leads to poor nitrogen removal performance in sewage treatment systems, an anaerobic/anoxic/aerobic (AAO) pilotscale reactor was established. The reactor aimed to treat low C/N (chemical oxygen demand; COD/ total nitrogen; TN) municipal wastewater (C/N<5). To enhance nitrogen removal and investigate the mechanism in the AAO process, a Pall ring modified biological suspended filler was introduced to the aerobic zone after achieving partial nitrification and denitrification (PND). The results revealed that the activated sludge-biofilm composite system can be successfully formed within 40 days, with a stable loaded biomass on the membrane at 40.06 mg/g (measured by volatile suspended solids (VSS)/filler). The aerobic zone of the activated sludge-biofilm composite system demonstrated an increase in nitrite accumulation rate (NAR) and simultaneous nitrification and denitrification efficiency (SND), from 60.46% and 19.42% in the initial stage (stage 1) to 69.62% and 46.47% in the stable forming stage (stage 3), respectively. By promoting both PND and SND pathways for nitrogen removal, the effluent from the system exhibited decreased concentrations of ammonia nitrogen (NH 4 + -N) at 0.11 mg/L and total nitrogen (TN) at 4.55 mg/L, indicating the significant synergistic effect of the biofilm on nitrogen removal. 16S rRNA amplification and sequencing analysis revealed that Proteobacteria was the dominant microorganism in the 60-day biofilm, accounting for 76.12% of the relative abundance. The main ammonia oxidizing bacteria (AOB) were Nitrosomanas (1.77%) and Nitrosococcus (1.69%). Meanwhile, denitrification microbial species were found to have a substantial proportion (29.11%), along with a small amount of Anammox bacteria (Anammoxoglobus,

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Section: Study On Microbial Population Structurementioning

confidence: 99%