Solid-phase denitrification for water remediation: processes, limitations, and new aspects

Zhong, Hua; Cheng, Ying; Ahmad, Zulfiqar; Shao, Yalu; Zhang, Hongwei; Lu, Qihong; Shim, Hyungbo

doi:10.1080/07388551.2020.1805720

Cited by 35 publications

(13 citation statements)

References 147 publications

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“…80 mg/L Cr(VI) significantly inhibited the reduction efficiency of NO 3 – -N at 45T, and immediately activated DNRA, but no significant difference was observed in the pathway of NO 3 – -N reduction between R 4 and R 6 . 73.7 and 53.8% of the NH 4 + -N accumulated in R 4 and R 6 were absorbed and utilized (Figure b), which confirmed that the produced NH 4 + -N could be used for microbial growth and metabolic product synthesis, improving pH and removing harmful substances . Furthermore, replacing a portion of denitrification with DNRA can avoid the additional toxic effect of NO 2 – -N accumulation.…”

Section: Resultsmentioning

confidence: 60%

“…+ -N could be used for microbial growth and metabolic product synthesis, improving pH and removing harmful substances. 47 Furthermore, replacing a portion of denitrification with DNRA can avoid the additional toxic effect of NO 2 − -N accumulation. As the main nitrogen source, NH 4 + -N generated from NO 2 − -N reduction also promotes Cr(VI) reduction efficiency and rate, as demonstrated by the increased expression of chrA, azoR, and nemA.…”

Section: Resultsmentioning

confidence: 99%

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Nitrate Bioreduction under Cr(VI) Stress: Crossroads of Denitrification and Dissimilatory Nitrate Reduction to Ammonium

Wang,

Zhao,

Chen

et al. 2023

Environ. Sci. Technol.

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This study explored the response of NO3 –-N bioreduction to Cr(VI) stress, including reduction efficiency and the pathways involved (denitrification and dissimilatory nitrate reduction to ammonium (DNRA)). Different response patterns of NO3 –-N conversion were proposed under Cr(VI) suppress (0, 0.5, 5, 15, 30, 50, and 80 mg/L) by evaluating Cr(VI) dose dependence, toxicity accumulation, bioelectron behavior, and microbial community structure. Cr(VI) concentrations of >30 mg/L rapidly inhibited NO3 –-N removal and immediately induced DNRA. However, denitrification completely dominated the NO3 –-N reduction pathway at Cr(VI) concentrations of <15 mg/L. Therefore, 30 and 80 mg/L Cr(VI) (R4 and R6) were selected to explore the selection of the different NO3 –-N removal pathways. The pathway of NO3 –-N reduction at 30 mg/L Cr(VI) exhibited continuous adaptation, wherein the coexistence of denitrification (51.7%) and DNRA (13.6%) was achieved by regulating the distribution of denitrifiers (37.6%) and DNRA bacteria (32.8%). Comparatively, DNRA gradually replaced denitrification at 80 mg/L Cr(VI). The intracellular Cr(III) accumulation in R6 was 6.60-fold greater than in R4, causing more severe oxidant injury and cell death. The activated NO3 –-N reduction pathway depended on the value of nitrite reductase activity/nitrate reductase activity, with 0.84–1.08 associated with DNRA activation and 1.48–1.57 with DNRA predominance. Although Cr(VI) increased microbial community richness and improved community structure stability, the inhibition or death of nitrogen-reducing microorganisms caused by Cr(VI) decreased NO3 –-N reduction efficiency.

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Section: Resultsmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 99%

Nitrate Bioreduction under Cr(VI) Stress: Crossroads of Denitrification and Dissimilatory Nitrate Reduction to Ammonium

Wang,

Zhao,

Chen

et al. 2023

Environ. Sci. Technol.

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“…The increase in organic substrate percentage seems to increase the ammonium concentration in solution. The transformation of nitrogen species may involve different processes that may happen simultaneously (Zhong et al, 2020). Dissimilatory nitrate reduction to ammonia (DNRA) is one of these processes that results in ammonia build‐up under anaerobic conditions.…”

Section: Discussionmentioning

confidence: 99%

“…Detailed studies, however, revealed that nitrate removal by DNRA is of minor importance generally found to be below 10% (Gibert et al, 2008; Greenan et al, 2009). The occurrence of ammonium may be also due to the degradation of organic substrates containing high organic nitrogen (Zhong et al, 2020). Especially, peanut shell and luffa sponge reflected higher ammonia concentrations after 45 days.…”

Section: Discussionmentioning

confidence: 99%

Screening of organic substrates for a permeable biobarrier to remediate nitrate contaminated groundwater

Özkaraova

AYDIN

Gemechu

2021

Water & Environment J

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Easily available organic substrates (e.g., peanut, walnut and almond shells and luffa sponge) were evaluated as potential filter material for permeable biobarrier systems. Higher removal efficiencies and rate constants were observed for lower (20%) substrate (e.g., peanut, walnut and luffa sponge) percentages indicating to the importance of substrate percentage. Rate constants were higher for total inorganic nitrogen removal (≥0.137 mg N/L/d) than for nitrate removal (≥0.127 mg N/L/d) in the batch bioreactors promising the capability of microorganisms in consuming substrate released nitrogen compounds. Continuous flow biobarriers revealed greater removal efficiencies (<1 mg NO3−–N/L) and rate constants (≥2.38 mg NO3−–N/L/d) that were related to better microbial performance with increased substrate contact. Different dissolved oxygen levels observed for peanut shell (≤7.45 mg O2/L) and luffa sponge columns (<3 mg O2/L) were indicating to the existence of different mechanisms and microorganisms during simultaneous heterotrophic nitrification and aerobic or anoxic denitrification. Luffa sponge was found to be the best candidate as a biobarrier substrate for a longer timescale, although walnut and almond shells may be excellent materials both supporting the denitrification process and permeability of barrier system.

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“…Aerobic heterotrophic microorganisms oxidize organic matter in these regions, leaving a limited amount of carbon for denitrifying microorganisms in the anoxic zones. Therefore, there is a need for an external carbon (C) source for heterotrophic denitrifying organisms (Zhong et al, 2020). The Wood chips, sawdust, and wheat straw are the most widely used external C sources.…”

Section: Biological Denitrification Processmentioning

confidence: 99%

Reject brine management: Denitrification and zero liquid discharge (ZLD)—Current status, challenges and future prospects

Nicolás

Molina‐García

García

et al. 2022

Journal of Cleaner Production

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Solid-phase denitrification for water remediation: processes, limitations, and new aspects

Cited by 35 publications

References 147 publications

Nitrate Bioreduction under Cr(VI) Stress: Crossroads of Denitrification and Dissimilatory Nitrate Reduction to Ammonium

Nitrate Bioreduction under Cr(VI) Stress: Crossroads of Denitrification and Dissimilatory Nitrate Reduction to Ammonium

Screening of organic substrates for a permeable biobarrier to remediate nitrate contaminated groundwater

Reject brine management: Denitrification and zero liquid discharge (ZLD)—Current status, challenges and future prospects

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