Nitrite accumulation and microbial behavior by seeding denitrifying phosphorus removal sludge for partial denitrification (PD): The effect of COD/NO3− ratio

Zhang, Miao; Gao, Jing; Liu, Quanlong; Fan, Yajun; Zhu, Chenjie; Liu, Yizhong; He, Chengda; Wu, Jun

doi:10.1016/j.biortech.2020.124524

Cited by 72 publications

(7 citation statements)

References 43 publications

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“…The influent NO 3 − -N and COD concentrations were maintained at 40 and 120 mg L −1 , respectively, with six run cycles performed every 24 h. NAR was >80% after 5 days of operation, indicating that the PD performance of activated − -N conversion rate of 27.18 mg L −1 and 82.18%, respectively, with low microbial community diversity observed. 28 It was found that when glucose was used as a carbon source, the COD/NO 3 − -N ratio increased from 6.0 to 15.0, achieving a maximum NO 2 − -N production rate of 0.34 ± 0.03 g N (gVSS d) −1 . 29 Even when the COD/NO 3 − -N ratio was increased to 25 with acetic acid as a carbon source, the denitrifying sludge was not inhibited with nitrite accumulation.…”

Section: Resultsmentioning

confidence: 98%

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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Section: Resultsmentioning

confidence: 98%

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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“…The autotrophs and heterotrophs were both abundant in S 1 –S 4 . The heterotrophs in S 1 –S 4 , including Ferruginibacter , Bacteroides , Trichococcus , Dokdonella , Herminiimonas , Sphingobium , and Cellulomonas , are associated with the degradation of organics or HD processes ( Chen et al, 2016 ; Han et al, 2020 ; Tian et al, 2021 ; Xin and Qiu, 2021 ; Zhang et al, 2021 ), and their abundances were both decreased or disappeared in S 5 –S 8 . The abundance of Rhodanobacter increased in R 1 and R 3 reactors, even though these bacteria are related to the degradation of carbohydrates ( Xin and Qiu, 2021 ).…”

Section: Resultsmentioning

confidence: 99%

“…Ignavibacterium has been reported as the nitrite-reducing bacteria ( Chai et al, 2020 ) and was only found in S 7 , most likely because of the high nitrite concentration of the ANAMMOX effluent. Chlorobaculum is sulfur-oxidizing bacteria that could oxidize sulfide and elemental sulfur to sulfate ( Zhang et al, 2021 ), its appearance in S 8 may be attributed to the sulfur disproportionation process or the SAD process, whereas the sulfide was hardly found in the R 4 effluent ( Figure 2 ), and it is thus considered that the Chlorobaculum may give extra advantage to ensure the quality of the effluent.…”

Section: Resultsmentioning

confidence: 99%

Denitrification Performance in Packed-Bed Reactors Using Novel Carbon-Sulfur-Based Composite Filters for Treatment of Synthetic Wastewater and Anaerobic Ammonia Oxidation Effluent

Wang

Liang²,

Kang³

et al. 2022

Front. Microbiol.

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To avoid nitrate pollution in water bodies, two low-cost and abundant natural organic carbon sources were added to make up the solid-phase denitrification filters. This study compared four novel solid-phase carbon-sulfur-based composite filters, and their denitrification abilities were investigated in laboratory-scale bioreactors. The filter F4 (mixture of elemental sulfur powder, shell powder, and peanut hull powder with a mass ratio of 6:2.5:1.5) achieved the highest denitrification ability, with an optimal nitrate removal rate (NRR) of 723 ± 14.2 mg NO3–-N⋅L–1⋅d–1 when the hydraulic retention time (HRT) was 1 h. The HRT considerably impacted effluent quality after coupling of anaerobic ammonium oxidation (ANAMMOX) and solid-phase-based mixotrophic denitrification process (SMDP). The concentration of suspended solids (SS) of the ANAMMOX effluent may affect the performance of the coupled system. Autotrophs and heterotrophs were abundant and co-existed in all reactors; over time, the abundance of heterotrophs decreased while that of autotrophs increased. Overall, the SMDP process showed good denitrification performance and reduced the sulfate productivity in effluent compared to the sulfur-based autotrophic denitrification (SAD) process.

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“…The comparative information on the microbial community structure of denitrifying organisms cultured for the long-term at different C/N ratios is limited. To best of our knowledge, only Zhang et al [ 25 ] compared the NO 2 − -N accumulation and microbial behavior at initial C/N ratios of 2.0, 2.5, 3.3 and 5.0 for the denitrified sludge fed with sodium acetate for 100 cycles. The highest nitrite transformation ratio (NTR) of 82.18% was obtained at C/N of 2.5.…”

Section: Introductionmentioning

confidence: 99%

Effect of COD/ NO3−-N ratio on nitrite accumulation and microbial behavior in glucose-driven partial denitrification system

Zeng¹,

Wang²,

Zhu³

et al. 2023

Heliyon

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Nitrite accumulation and microbial behavior by seeding denitrifying phosphorus removal sludge for partial denitrification (PD): The effect of COD/NO3− ratio

Cited by 72 publications

References 43 publications

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

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

Denitrification Performance in Packed-Bed Reactors Using Novel Carbon-Sulfur-Based Composite Filters for Treatment of Synthetic Wastewater and Anaerobic Ammonia Oxidation Effluent

Effect of COD/ NO3−-N ratio on nitrite accumulation and microbial behavior in glucose-driven partial denitrification system

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