Unravelling nitrogen removal and nitrous oxide emission from mainstream integrated nitrification-partial denitrification-anammox for low carbon/nitrogen domestic wastewater

Zhou, Xin; Jin, Zhen; Wang, Gonglei; Yin, Zeyang; Cao, Xiwei; Gao, Jingfeng

doi:10.1016/j.jenvman.2020.110872

Cited by 41 publications

(13 citation statements)

References 32 publications

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“…The nif-speci c activator NifA was reported to be involved in the regulation of nitrogenase activity during the nitrogen xation process [52]. The expression of hao gene was highly correlating nitrogen removal and N 2 O emission characteristics [53]. Compared with the original version, the average expression levels of nirA and nifA were signi cantly up-regulated the improved bio lter, suggesting their roles in assimilating ammoniacontaining odorous gases.…”

Section: Discussionmentioning

confidence: 99%

Metagenomic analysis of microbial community structure and function in a improved biofilter with odorous gases

Ni¹,

Yang²,

Liqing³

et al. 2021

Preprint

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BackgroundBiofilters have been broadly applied to degrade the odorous gases from industrial emissions. To explore biofilter potentials, the microbial community structure and function must be well defined. Using of improved biofilter, changes in microbial community structures and functions were investigated by metagenomic analysis. ResultsOdorous gases have the potential to alter the microbial community structure in the sludge of biofilter. A total of 90,016 unigenes assigned into various functional metabolic pathways were identified. In the improved biofilter, the dominant phyla were Proteobacteria, Planctomycetes, and Chloroflexi, and the dominant were Thioalkalivibrio, Thauera, and Pseudomonas. Several xenobiotic biodegradation-related pathways showed significant changes during the treatment process. Compared with the original biofilter, Thermotogae and Crenarchaeota phyla were significantly up-regulated in the improved biofilter, suggesting its important role in nitrogen-fixing. Furthermore, nitrogen metabolic pathway-related genes, such as nirA and nifA, and sulfur metabolic pathway-related genes, such as fccB and phsA, were considered to be efficient genes involved in removing odorous gases. ConclusionsOur findings can be used for improving the efficiency of biofilter and helping the industrial enterprises to reduce the emission of waste gas.

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Section: Discussionmentioning

confidence: 99%

Metagenomic analysis of microbial community structure and function in a improved biofilter with odorous gases

Ni¹,

Yang²,

Liqing³

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…The position of different microbial communities in the granule is determined by their competition for substrates and space. The previous study has been demonstrated that AMX, HET, and AOB can coexist in the granule (Zhou et al 2020). It has been found that AOB are usually located on the outside of the granule and AMX are located deeper in the granule in terms of pro le biomass distribution (Mozumder et al 2014), whereas aerobic heterotrophs are located on the outermost surface of the granule, DB are located in the anoxic zone of the granule (Zhou et al 2018).…”

Section: In Uence Of Combined Cod and Do On Tnr And The Analysis Of Microbial Communitiesmentioning

confidence: 96%

“…6 gives us a good overview of the simulation results of autotrophic and heterotrophic bacteria proportion at different COD and DO levels. Aeration in the onestage reactor resulted in the presence of AOB and NOB in the outer layer of the granule and it has been demonstrated that the sequence of biological reactions in the granule/bio lm started with the aerobic oxidation of COD followed by the nitri cation process of AOB (Zhou et al 2020;Zhou et al 2018). Fig.…”

Section: Contribution Of Pd To Nitrogen Removal Without Nobmentioning

confidence: 99%

“…However, compared to the low in uent COD condition, AMX biomass started to decrease at granule R/R max = 0.6 because the optimum bulk oxygen concentration increased due to the increasing COD concentration, thus reducing the anaerobic zone thickness. Besides, in the outermost layer of the granule, where the aerobic heterotrophs dominated due to su cient bulk oxygen and COD (heterotrophic bacteria grew faster than autotrophic bacteria), AOB were outcompeted by the aerobic heterotrophs and AOB were present just below them (Zhou et al 2020;Zhou et al 2018). In general, COD and DO are almost completely depleted by the outer HET and AOB, thus forming an anoxic zone in the mid-granule,…”

Section: Contribution Of Pd To Nitrogen Removal Without Nobmentioning

confidence: 99%

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Model-based evaluation of the contribution of partial denitrification (PD) on the one-stage autotrophic nitrogen removal process

Zhang

Liu

et al. 2021

Preprint

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The nitrate produced by the one-stage partial nitritation-anammox (PN/A) process can be removed through partial denitrification (PD) by adding carbon source. In this study, a 1D multi-population biofilm model was developed to evaluate the contribution of partial denitrification on the one-stage autotrophic nitrogen removal process at influent NH4+ = 100 mg N/L. The dynamic simulation that was carried out to investigate the effect of nitrite-oxidizing bacteria (NOB) revealed that PD contributed to the reactor to obtain total nitrogen removal efficiency (TNR) of above 90% and the effluent nitrate was significantly decreased with the absence of NOB. However, PD decreased TNR of the one-stage PN/A process with the presence of NOB. Increased influent chemical oxygen demand (COD) widened the dissolved oxygen (DO) range required for high TNR whether NOB were present or not. The steady-state simulation results showed that NOB were always absent in the granules at high DO and COD levels and the optimum DO > 0.5 mg/L when influent COD was over 50 mg/L. Besides, higher influent COD/NH4+ (C/N) and larger granule diameter (diameter > 1600 µm) were contributed to widening the range of DO required for high TNR. The nitrogen removal contribution of anammox bacteria (AMX) was significantly higher than denitrification in the reactor.

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“…Based on the core mechanism and actual feasibility, three comprehensive and practical anammox-based processes have garnered most of the research attention: the PN/A process (Chen et al, 2019), the PD/A process (Ma et al, 2017;Zhou et al, 2020), and the DAMO/A process (Shi et al, 2013;Liu et al, 2020). The nitrogen removal pathway of these processes are shown in Fig.…”

Section: The Main Anammox-based Processesmentioning

confidence: 99%

The main anammox-based processes, the involved microbes and the novel process concept from the application perspective

Guo

Luo

Shen

et al. 2021

Front. Environ. Sci. Eng.

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Anammox technology has been widely researched over the past 40-year from the laboratory-scale to full-scale. It is well-known that in actual applications, the solo application of anammox is not feasible. Since both ammonium and nitrite are prerequisites based on the reaction mechanism, the pre-treatment of wastewater is necessary. With the combination of anammox process and other pre-treatment processes to treat the actual wastewater, many types of anammox-based processes have been developed with distinct nitrogen removal performance. Thus, in order to heighten the awareness of researchers to the developments and accelerate the application of these processes to the treatment of actual wastewater, the main anammox-based processes are reviewed in this paper. It includes the partial nitritation/anammox process, the denitratation/anammox (PD/A) process, the denitrifying anaerobic methane oxidation/anammox (DAMO/A) process, and more complex deuterogenic processes. These processes have made the breakthroughs in the application of the anammox technology, such as the combination of nitrification and PD/A process can achieve stability and reliability of nitrogen removal in the treatment of mainstream wastewater, the PD/A process and the DAMO/A have brought about further improvements in the total nitrogen removal efficiency of wastewater. The diversity of functional microbe characteristics under the specific condition indicate the wide application potential of anammox-based processes, and further exploration is necessary. A whole waste treatment system concept is proposed through the effective allocation of above mentioned processes, with the maximum recovery of energy and resources, and minimal environmental impact.

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Unravelling nitrogen removal and nitrous oxide emission from mainstream integrated nitrification-partial denitrification-anammox for low carbon/nitrogen domestic wastewater

Cited by 41 publications

References 32 publications

Metagenomic analysis of microbial community structure and function in a improved biofilter with odorous gases

Metagenomic analysis of microbial community structure and function in a improved biofilter with odorous gases

Model-based evaluation of the contribution of partial denitrification (PD) on the one-stage autotrophic nitrogen removal process

The main anammox-based processes, the involved microbes and the novel process concept from the application perspective

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