Insights into heterotrophic denitrification diversity in wastewater treatment systems: Progress and future prospects based on different carbon sources

Wang, Haishuang; Chen, Nan; Deng, Yang

doi:10.1016/j.scitotenv.2021.146521

Cited by 129 publications

(32 citation statements)

References 117 publications

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“…On the other hand, after hydrothermal treatment, the speci c surface area and the internal pores of PBs increased, enhancing the NO 3 − -N adsorption capacity. Moreover, the addition of PBs contributed to the establishment of microbial community as denitri cation is a reaction process dominated by microorganisms, in which functional microorganisms play a vital role (Wang et al, 2021). Meanwhile, the electron transfer process plays an essential role in the denitri cation process, and H-PBs, as the lignocellulosic materials, can provide electron donors for denitri cation (Wang et al, 2016).…”

Section: No 3 − -N Nh 4 + -N and Tn Removal Rate In Brcsmentioning

confidence: 99%

“…The nitrogen removal performance of bioretention basins is variable, especially for NO 3 − -N, owing to the lack of carbon source and anaerobic conditions (Zhang et al, 2021). The application of natural materials (sawdust, wood bark, straw, calamus and other agricultural waste products) for an additional carbon source to solve the carbon shortage in bioretention cells (BRCs) for rainwater with a low C/N (COD/nitrogen ratio) is well-known (Wang et al, 2021). One of the promising biomass carbon source is pine bark (PB) representing wastes of timber harvesting and timber processing.…”

Section: Introductionmentioning

confidence: 99%

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Enhance nitrogen removal in bioretention cells with addition of hydrothermal pre-treated pine barks as external carbon source

Tuo

Cao

et al. 2021

Preprint

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The problem of poor carbon source is a common factor limiting the nutrients removal in bioretention cells (BRCs). This study aimed to investigate the feasibility of using modified biomass in BRCs filled with a mixture of fly ash ceramsite and pumice fillers to enhance nitrogen removal. Different pretreatment methods (hydrothermal-treated, acid-treated and alkali-treated) were attempted, and hydrothermal pretreatment showed a best performance in carbon release ability. The scanning electron microscopy showed that the lignin in hydrothermal pretreated pine barks (H-PBs) was destroyed, and the fiber structure became thinner with more irregular folds, which improved the accessibility of cellulose and attachment of microorganisms. The addition of H-PBs significantly enhanced the nutrients removal in BRCs, and the removal rates of TN and NO3−-N increased by 23.25% and 38.22% compared with those in BRC-A (without external carbon source), but the removal rate of NH4+-N was inferior to BRC-A. Besides, the large carbon release amount of H-PBs did not deteriorate the effluent quality, with COD removal rate of 87.98% in the 48 d. These results indicate that the BRCs by adding H-PBs could intensify the denitrification process.

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Section: No 3 − -N Nh 4 + -N and Tn Removal Rate In Brcsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Enhance nitrogen removal in bioretention cells with addition of hydrothermal pre-treated pine barks as external carbon source

Tuo

Cao

et al. 2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Carbon source type and dosage play important roles that need to be optimized during the tertiary denitrification process for meeting a higher discharge standard. Many materials could be utilized as carbon sources, such as waste paper (Bao et al, 2016;Haske-Cornelius et al, 2021), biodegradable polymer (Wang et al, 2021), and wheat straw (Khokhar et al, 2014;Liu et al, 2021). Readily biodegradable organic matters are the optimal electron donors compared with refractory organic and other electron donors (Cao et al, 2016;Luo et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Advanced Treatment of Urban Sewage by Denitrification Deep-Bed Filter: Removal Performance and Metabolic Pathway

et al. 2022

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This study aimed to explore the performance of denitrification deep-bed filter (DN-DBF) to treat municipal sewage for meeting a more stringent discharge standard of total nitrogen (TN) (10.0 mg L–1). A lab-scale DN-DBF was conducted to optimize operation parameters and reveal the microbiological mechanism for TN removal. The results showed that more than 12.7% TN removal was obtained by adding methanol compared with sodium acetate. The effluent TN concentration reached 6.0–7.0 mg L–1 with the optimal influent carbon and nitrogen ratio (C/N) and hydraulic retention time (HRT) (3:1 and 0.25 h). For the nitrogen removal mechanism, Blastocatellaceae_Subgroup_4 and norank_o_JG30-KF-CM45 were dominant denitrification floras with an abundance of 6–10%. Though large TN was removed at the top layer of DN-DBF, microbial richness and diversity at the middle layer were higher than both ends. However, the relative abundance of nitrite reductase enzymes (EC1.7.2.1) gradually increases as the depth increases; conversely, the relative abundance of nitrous oxide reductase gradually decreased.

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“…Nitrate could be transformed in the human body, which may cause blue baby syndrome and increase the risk of gastrointestinal cancer (Garcia-Segura et al 2018). There have been a lot of reports about nitrate pollution in China and abroad, such as in the east and west of Nebraska in the US and the Yellow River Delta in China (Wang et al 2021).…”

Section: Introductionmentioning

confidence: 99%

“…Biological denitrification has the advantages of high efficiency and low consumption among many methods; thus, the method of using biological denitrification to remove nitrate from water has been increasingly applied (Zhou et al 2015;Yang et al 2021). Denitrifying microorganisms play a critical role in the successful application of bio-electrochemical denitrification systems to remove nitrogen (as nitrate) from contaminated water (Adav et al 2010;Wang et al 2021). These organisms are central to the entire denitrification process, and can reduce NO À 3 -N or NO À 2 -N in water to N 2 , which is released into the atmosphere, thus reducing the nitrogen-containing pollutant concentrations in water (Jin et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Analysis of denitrification performance and microbial community structure in a bio-electrochemical reactor under different current densities with wheat-rice stone powder

Liu

2022

Journal of Water Reuse and Desalination

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Nitrate widely exists in water pollution and is the most stable form of nitrogen pollution. This study investigated the effect of the current density (CD) and the wheat-rice stone powder (WP) on denitrification performance, microbial diversity and enzyme activity in a bio-electrochemical reactor (BER). It was found that an optimum CD of 200 mA/m2 and the addition of WP significantly improved the nitrate removal rate constant compared with the control group (12.28 d−1 versus 9.75 d−1) and remarkably reduced the intermediate accumulation of nitrite. The application of both optimum CD and WP enhanced the microbial diversity and catalytic activity of nitrate reductase (Nar) and nitrite reductase (Nir). The most dominant microbial taxa in our reactor were Methyloversatilis, Methylotenera, and an unclassified genus of the family Methylophilaceae. Moreover, WP allowed the denitrifiers to better withstand the stress of high CD. This study presented results supporting the use of an optimum CD and natural mineral addition to improving the performance of the denitrification process within a BER.

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Insights into heterotrophic denitrification diversity in wastewater treatment systems: Progress and future prospects based on different carbon sources

Cited by 129 publications

References 117 publications

Enhance nitrogen removal in bioretention cells with addition of hydrothermal pre-treated pine barks as external carbon source

Enhance nitrogen removal in bioretention cells with addition of hydrothermal pre-treated pine barks as external carbon source

Nitrogen Advanced Treatment of Urban Sewage by Denitrification Deep-Bed Filter: Removal Performance and Metabolic Pathway

Analysis of denitrification performance and microbial community structure in a bio-electrochemical reactor under different current densities with wheat-rice stone powder

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