Efficient nitrite accumulation and elemental sulfur recovery in partial sulfide autotrophic denitrification system: Insights of seeding sludge, S/N ratio and flocculation strategy

Yuan, Zhao; Chen, Yongzhi; Zhang, Ming; Qin, Yanrong; Zhang, Minan; Mao, Peiyue; Yuan, Yan

doi:10.1016/j.chemosphere.2021.132388

Cited by 24 publications

(11 citation statements)

References 47 publications

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“…In previous studies about autotrophic denitrification, a maximum NAR of 85.2% was achieved using a SAD‐SBR system with an HRT of 7.5 h, 10 while a maximum NAR of only 55.3% was achieved with an HRT of 4 h 27 and a maximum NAR of 70% was achieved with an HRT of 6 h in an SBR reactor 28 . However, in the present study, the highest NAR reached 93.48% when an HRT of 4 h was applied, proving that the denitrification rate of the mixotrophic denitrification system was faster than that of the autotrophic denitrification system and that the nitrite accumulation performance was better.…”

Section: Resultsmentioning

confidence: 94%

“…In denitrification systems, changes in pH not only affect the growth and metabolism of microorganisms but they also alter microorganisms’ enzyme activity, thus affecting the effectiveness and toxicity of the substrate 8,10,33 . As shown by Eqns.…”

Section: Resultsmentioning

confidence: 99%

“…The main products in the SBR effluent were nitrite and elemental sulfur, both of which effectively provided substrates for the ANAMMOX reaction. However, sulfide is highly reducible and toxic, with high concentrations of sulfide producing serious toxic effects on ANAMMOX microorganisms 10 . Based on these findings, this study assessed the two‐stage AHD‐ANAMMOX process, constructing an integrated AHD‐ANAMMOX synchronous nitrogen, sulfur, and carbon removal system, with the ANAMMOX reaction substrate ratio controlled to 1.12, with an HRT of 26 h, and the SBR effluent being introduced into the ASBR‐ANAMMOX reactor.…”

Section: Resultsmentioning

confidence: 99%

“…In different sulfur denitrification systems, the accumulation of nitrite has been successfully reported using different substrate concentrations and hydraulic retention times (HRTs). When sulfide was used as an electron donor, the maximum nitrite accumulation rate (NAR) reached 85.20% with a S/N ratio of 1.1, an HRT of 7.5 h, and with 73.50% S 0 accumulation 10 . NAR reached over 80% with a S/N ratio of 3:1, using thiosulfate as an electron donor for the short‐cut SAD process 11 …”

Section: Introductionmentioning

confidence: 99%

“…When sulfide was used as an electron donor, the maximum nitrite accumulation rate (NAR) reached 85.20% with a S/N ratio of 1.1, an HRT of 7.5 h, and with 73.50% S 0 accumulation. 10 NAR reached over 80% with a S/N ratio of 3:1, using thiosulfate as an electron donor for the short-cut SAD process. 11…”

Section: Introductionmentioning

confidence: 99%

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Realization of nitrite accumulation in an autotrophic‐heterotrophic denitrification system using different S/N/C ratios coupled with ANAMMOX to achieve nitrogen removal

Liu

Dang

et al. 2022

J of Chemical Tech & Biotech

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BACKGROUND: Nitrogen and sulfur pollutants have become an urgent problem in surface and groundwater. Short-cut denitrification coupled with anaerobic ammonia oxidation (ANAMMOX) is an economical and efficient biological nitrogen removal process. However, single heterotrophic denitrification and autotrophic denitrification face the problems of high treatment cost and high secondary sulfate pollution, respectively. Moreover, in real environments, single nutrient conditions are less common. Therefore, this work aims to study the process of mixotrophic short-cut denitrification coupled with ANAMMOX to achieve simultaneous nitrogen and sulfur removal.RESULTS: Mixotrophic short-cut denitrification was successfully initiated on day 20, while the nitrite accumulation rate (NAR) was 81.47%. The optimal performance of the mixotrophic denitrification system was achieved when the ratio of sulfur to nitrogen to carbon (S/N/C) was 3/4/9, with S 2− -S, NO 3 − -N, and COD removal reaching 100%, 94.48%, and 95.48%, respectively, with a NAR of 94.24% and only 11.73 mg L −1 of SO 4 2− -S production. Modified Boltzmann and Gompertz models were found to be suitable to describe the removal of NO 3 − -N, with both models exhibiting good data fitting (R 2 > 0.99). In addition, no distinctly dominant genus was found in the mixotrophic denitrification systems. Autotrophic, heterotrophic, and facultative denitrifying bacteria (such as Thiobacillus Pseudomonas and Halomonas) were found to coexist and synergistically perform denitrification. CONCLUSION: Mixotrophic short-cut denitrification can achieve the efficient accumulation of NO 2 − -N and reduce the amount of SO 4 2− -S production at the same time. Mixotrophic short-cut denitrification coupled with ANAMMOX can deeply remove sulfide, nitrogen, and organic carbon.

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Section: Resultsmentioning

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Realization of nitrite accumulation in an autotrophic‐heterotrophic denitrification system using different S/N/C ratios coupled with ANAMMOX to achieve nitrogen removal

Liu

Dang

et al. 2022

J of Chemical Tech & Biotech

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Partial denitrification in domestic sewage and nitrate wastewater: study of the initiation, influencing factors and operational performance

Ma,

Qin,

Chen

et al. 2023

J of Chemical Tech & Biotech

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BackgroundPractical application of the anaerobic ammonium oxidation (anammox) process has been limited by the difficulty of obtaining a stable supply of NO2‐‐N. In this study, partial denitrification was utilized as a novel approach to obtain nitrite for anammox, investigating the initiation, influencing factors and performance of partial denitrification in the simultaneous treatment of domestic sewage and nitrate wastewater.ResultsWhen the influent concentration of NO3‐‐N was 40 mg/L and the chemical oxygen demand to nitrate (COD/NO3‐‐N) ratio was 2.7, the NO2‐‐N accumulation rate exceeded 80%, with an effluent NO2‐‐N concentration of 35.64 mg/L. Furthermore, the partial denitrification performance was good. When the volume ratio of domestic sewage and nitrate wastewater was adjusted to 2:3 and sodium acetate was added to form a COD/NO3‐‐N ratio of 3.6, the effluent NO2‐‐N/NH4+‐N ratio was 1.24 and the effluent NO2‐‐N concentration and average NO2‐‐N accumulation rate reached >31.24 mg/L and 83.38%, respectively, effectively ensuring influent requirements for anammox.ConclusionThe NO3‐‐N reduction rate , NO3‐‐N removal rate and NO2‐‐N accumulation rate were positively correlated with the influent nitrate concentration when ranging between 15‐40 mg/L. An appropriate increase in the influent COD/NO3‐‐N ratio was conducive to a reduction in the time required for maximum levels of NO2‐‐N accumulation to occur, with an influent NO3‐‐N concentration of 40 mg/L. The partial denitrification system could simultaneously treat domestic sewage and nitrate wastewater, effectively ensuring that the generated effluent met the influent requirements for subsequent anammox.This article is protected by copyright. All rights reserved.

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Research progress and prospect of low-carbon biological technology for nitrate removal in wastewater treatment

Zheng,

Zhang,

Kong

et al. 2024

Front. Environ. Sci. Eng.

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Wastewater treatment plants are the major energy consumers and significant sources of greenhouse gas emissions, among which biological nitrogen removal of wastewater is an important contributor to carbon emissions. However, traditional heterotrophic denitrification still has the problems of excessive residual sludge and the requirement of external carbon sources. Consequently, the development of innovative low-carbon nitrate removal technologies is necessary. This review outlines the key roles of sulfur autotrophic denitrification and hydrogen autotrophic denitrification in low-carbon wastewater treatment. The discovered nitrate/nitrite dependent anaerobic methane oxidation enables sustainable methane emission reduction and nitrogen removal by utilizing available methane in situ. Photosynthetic microorganisms exhibited a promising potential to achieve carbon-negative nitrate removal. Specifically, the algal-bacterial symbiosis system and photogranules offer effective and prospective low-carbon options for nitrogen removal. Then, the emerging nitrate removal technology of photoelectrotrophic denitrification and the underlying photoelectron transfer mechanisms are discussed. Finally, we summarize and prospect these technologies, highlighting that solar-driven biological nitrogen removal technology is a promising area for future sustainable wastewater treatment. This review has important guiding significance for the design of low-carbon wastewater treatment systems.

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Efficient nitrite accumulation and elemental sulfur recovery in partial sulfide autotrophic denitrification system: Insights of seeding sludge, S/N ratio and flocculation strategy

Cited by 24 publications

References 47 publications

Realization of nitrite accumulation in an autotrophic‐heterotrophic denitrification system using different S/N/C ratios coupled with ANAMMOX to achieve nitrogen removal

Realization of nitrite accumulation in an autotrophic‐heterotrophic denitrification system using different S/N/C ratios coupled with ANAMMOX to achieve nitrogen removal

Partial denitrification in domestic sewage and nitrate wastewater: study of the initiation, influencing factors and operational performance

Research progress and prospect of low-carbon biological technology for nitrate removal in wastewater treatment

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