Nitrogen removal characteristics of enhanced in situ indigenous aerobic denitrification bacteria for micro-polluted reservoir source water

Zhou, Shilei; Huang, Tinglin; Zhang, Haihan; Zeng, Mingzheng; Liu, Fei; Bai, Shiyuan; Shi, Jianghong; Qiu, Xiaopeng; Xue, Yang

doi:10.1016/j.biortech.2015.11.041

Cited by 42 publications

(18 citation statements)

References 30 publications

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“…However, a lower nitrogen removal rate was also found in the control area, which was inconsistent with previous results [23]. In our study, ammonia and nitrite were simultaneously removed via nitrification and denitrification, and similar results were obtained in previous studies [17,23]. In order to clearly understand whether the activity of indigenous aerobic denitrifiers had been improved and to determine the growth of indigenous aerobic denitrifiers, the Biolog method and plate count method were used for both the enhanced and control areas.…”

Section: Nitrogen Removal In the Enhanced Areacontrasting

confidence: 99%

“…The results obtained in the study of the enhanced area were consistent with those described before. However, a lower nitrogen removal rate was also found in the control area, which was inconsistent with previous results [23]. In our study, ammonia and nitrite were simultaneously removed via nitrification and denitrification, and similar results were obtained in previous studies [17,23].…”

Section: Nitrogen Removal In the Enhanced Areacontrasting

confidence: 89%

“…Thus, the activity of indigenous aerobic denitrifiers may be enhanced in the enhanced area in situ. As is already known, aerobic denitrification bacteria have been found in natural environments such marine sediments, constructed wetlands, and reservoirs [21][22][23], and have been reported only by these three studies. In this study, we also observe the phenomenon of nitrogen removal in a drinking water reservoir in situ with nitrite and ammonia accumulation.…”

Section: Nitrogen Removal In the Enhanced Areamentioning

confidence: 91%

“…We consider that the indigenous aerobic denitrifiers were activated by the in situ operation of WLAs. Deviating from our previous research [23], the present study was performed in the field with the in situ operation of eight WLAs, and not in an enclosure system. The results obtained in the study of the enhanced area were consistent with those described before.…”

Section: Nitrogen Removal In the Enhanced Areamentioning

confidence: 99%

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In Situ Water Quality Improvement Mechanism (Nitrogen Removal) by Water-Lifting Aerators in a Drinking Water Reservoir

Zhou

Gong

et al. 2018

Water

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A field scale experiment was performed to explore the nitrogen removal performance of the water and surface sediment in a deep canyon-shaped drinking water reservoir by operating WLAs (water-lifting aerators). Nitrogen removal performance was achieved by increasing the densities and N-removal genes (nirK and nirS) of indigenous aerobic denitrifiers. After the operation of WLAs, the total nitrogen removal rate reached 29.1 ± 0.8% in the enhanced area. Ammonia and nitrate concentrations were reduced by 72.5 ± 2.5% and 40.5 ± 2.1%, respectively. No nitrite accumulation was observed. Biolog results showed improvement of carbon metabolism and carbon source utilization of microbes in the enhanced area. Miseq high-throughput sequencing indicated that the denitrifying bacteria percentage was also higher in the enhanced area than that in the control area. Microbial communities had changed between the enhanced and control areas. Thus, nitrogen removal through enhanced indigenous aerobic denitrifiers by the operation of WLAs was feasible and successful at the field scale.

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Section: Nitrogen Removal In the Enhanced Areacontrasting

confidence: 99%

Section: Nitrogen Removal In the Enhanced Areacontrasting

confidence: 89%

Section: Nitrogen Removal In the Enhanced Areamentioning

confidence: 91%

Section: Nitrogen Removal In the Enhanced Areamentioning

confidence: 99%

See 2 more Smart Citations

In Situ Water Quality Improvement Mechanism (Nitrogen Removal) by Water-Lifting Aerators in a Drinking Water Reservoir

Zhou

Gong

et al. 2018

Water

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“…1). Because many kinds of heterotrophic bacteria coexisted in drinking water systems (Allen et al 2004;Tihomirova et al 2012;El-Chakhtoura et al 2015;Nagymáté et al 2016), thus organic matters in drinking water could be removed at higher DO levels with or without denitrifying bacteria (Allen et al 2004;Zhu et al 2012;Zhou et al 2016). As shown in Fig.…”

Section: Limiting Factors Of Biofilm Formationmentioning

confidence: 99%

Performance improvement of raw water pretreatment process with pre-inoculation biofilm: feasibility and limiting factors

et al. 2016

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The initial formation of biofilm and the removal performance of pollutants in biological pretreatment process for polluted raw water were limited due to the oligotrophic niche in raw water. In this study, the feasibility of using pre-inoculation biofilm formed under nutrients enhanced condition for polluted raw water treatment was analyzed in nine batch reactors. Results showed that the pollutants removal performance of biofilm was improved under nutrients enhanced conditions. Ammonia oxidation rate (AOR) was exponentially increased with the increasing in NH-N levels, and organic matter removal rate (ORR) was positively related to the initial total organic carbon (TOC) concentration. The biofilm formation and microbial diversity were further improved via adding more substrates, seeding river sediment and feeding effluent from a mature biofilm reactor. However, the biofilm formed under higher substrate conditions had higher half-saturation constant values (K ) to both NH-N and TOC, which decreased AOR and ORR values when it was used to treat polluted raw water. The reduction percentage of AOR and ORR showed logarithmic growth modes with the increase in K values. Fortunately, improvement of nutrients flux via accelerating influent replacement could enhance the start-up performance effectively and decrease the operation risk introduced by the changes in substrate affinity.

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Performance appraisal of microbial inoculants treating polluted surface water through bench‐scale investigation

Simon

Joshi

Hazra

2023

J of Chemical Tech & Biotech

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BACKGROUNDThis study investigates the performance of microbial inoculants by exploring pollutant removal efficiency, microbial viability and substrate removal kinetics for treating polluted surface water. The morphological, elemental composition and biochemical characterization of inoculants were analyzed using field emission scanning electron microscopy with energy dispersive X‐ray spectroscopy (FESEM‐EDX) and Fourier transform infrared (FTIR) techniques. The identification of bacterial strains in polluted feed water also was performed using 16S rRNA partial sequencing. Bench‐scale efficacy of selected microbial inoculants (MI) along with control for each study was performed at variable retention times ranging from 6 to 72 h, under optimum operating conditions.RESULTSThe maximum removal (86% and 90%) of the organic load (chemical and biological oxygen demand, COD and BOD) was achieved by inoculants containing Bacillus subtilis along with other microbial species after 72 h of treatment. The microbial inoculant MI‐2 containing Paracoccus pantotrophus and Pseudomonas Putida exhibited the highest TN removal (66%) after 72 h of contact time. Adenosine triphosphate (ATP) analysis revealed that the active biomass ratio is a more precise indicator of healthy biomass instead of the conventionally used parameter MLVSS (mix liquor volatile suspended solids) in a biological treatment system, which apparently provides a significant addition to the existing knowledge base for the operational wastewater treatment plants (WTPs).CONCLUSIONIn this study, microbial inoculants were found to be frugal and viable treatment tools for the remediation of polluted surface water. Exploiting such inoculants also can overcome the inefficiencies of existing sewage treatment plants by serving as potential tools for bio‐augmenting the indigenous microbial fingerprint of aeration tank/secondary treatment systems. © 2023 Society of Chemical Industry (SCI).

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Nitrogen removal characteristics of enhanced in situ indigenous aerobic denitrification bacteria for micro-polluted reservoir source water

Cited by 42 publications

References 30 publications

In Situ Water Quality Improvement Mechanism (Nitrogen Removal) by Water-Lifting Aerators in a Drinking Water Reservoir

In Situ Water Quality Improvement Mechanism (Nitrogen Removal) by Water-Lifting Aerators in a Drinking Water Reservoir

Performance improvement of raw water pretreatment process with pre-inoculation biofilm: feasibility and limiting factors

Performance appraisal of microbial inoculants treating polluted surface water through bench‐scale investigation

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