Denitrification with natural gas and various new growth media

Rajapakse, Jay; Scutt, J.

doi:10.1016/s0043-1354(99)00088-3

Cited by 47 publications

(11 citation statements)

References 10 publications

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“…4 shows the NO 3 -N and COD removal efficiency variation with influent NO 3 -N concentration when ethanol was used as carbon source and HRT was 24 h. As the influent concentration of NO 3 -N nitrogen increases (50 to 250 mg/L) the NO 3 -N nitrogen and COD removal efficiency decreased. Rajapakse and Scutt, 1999 investigated the treatment of synthetic wastewater (by dissolving NaNO 3 in tap water) using methanol as the carbon source. Their results reveal that, as influent NO 3 -N nitrogen concentration increased, denitrification efficiency decreased.…”

Section: Resultsmentioning

confidence: 99%

Performance of upflow anoxic bioreactor for wastewater treatment

Behera

Rene

Murthy

2007

Int. J. Environ. Sci. Technol.

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ABSTRACT:Laboratory scale studies were conducted in an up-flow anoxic bioreactor (UFAB) using synthetic fertilizer wastewater for ascertaining the denitrification efficiency. The performance of the reactor was compared using ethanol and topioca starch as the carbon source. The initial NO 3 -N concentrations (50-250 mg/L) and hydraulic retention time (HRT, 12-24 h) were varied to evaluate the COD and NO 3 -N removal. The results from this study shows that ethanol gave very good denitrification efficiency (78-98%) compared to topioca starch (68-96%).

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Section: Resultsmentioning

confidence: 99%

Performance of upflow anoxic bioreactor for wastewater treatment

Behera

Rene

Murthy

2007

Int. J. Environ. Sci. Technol.

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“…Similarly, Werner and Kayser [2] obtained a high denitrification rate by introducing landfill-derived biogas into various types of wastewater treatment reactors, including a complete mixing reactor, trickling filter, and fluidized bed reactor, and subsequently studied the denitrification properties under aerobic conditions. In addition, the potential for methane-dependent denitrification has been verified based on the findings of laboratory-based reactor experiments [3][4][5]. When ammonia (NH 3 ) is present, methanotrophs oxidize NH 3 into NH 3 OH, and then into N 2 O as mediated by methane monooxygenase, a methane-oxidizing enzyme that uses NH 3 as a cometabolite; this reaction resembles the NH 3 oxidation pathway mediated by ammonia-oxidizing bacteria [6,7].…”

Section: Introductionmentioning

confidence: 98%

Development of a Combined Aerobic–Anoxic and Methane Oxidation Bioreactor System Using Mixed Methanotrophs and Biogas for Wastewater Denitrification

Kim

Lee

Yoo

et al. 2019

Water

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We developed a lab-scale aerobic–methane oxidation bioreactor (MOB)–anoxic system, combining a MOB and the aerobic–anoxic denitrification process, and evaluated its potential for advanced nitrogen treatment in wastewater treatment plants (WWTPs). The MOB used biogas generated from a WWTP and secondary-treated wastewater to support mixed methanotroph cultures, which mediated the simultaneous direct denitrification by methanotrophs and methanol production necessary for denitrifying bacteria in the anoxic chamber for denitrification. Compared to the aerobic–anoxic process, the aerobic–MOB–anoxic system with an influent concentration of 4.8 L·day−1 showed a marked increase in the reduction efficiency for total nitrogen (41.9% vs. 85.9%) and PO4−3-P (41.1% vs. 69.5%). However, the integrated actions of high nitrogen and phosphorus consumption are required for methanotroph growth, as well as the production and supply of methanol as a carbon source for denitrification and methane monooxygenase-mediated oxidation of NH3 into N2O by methanotrophs. After three months of continuous operation using actual wastewater, the total nitrogen removal rate was 76.3%, equivalent to the rate observed in a tertiary-advanced WWTP, while the total phosphorus removal rate reached 83.7%.

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“…Most studies regarding denitrification coupled with methane oxidation have been performed using batch assays . In addition, other studies involving continuous reactors indicated that this process is feasible. Nevertheless, these studies focused on using methane gas as the carbon source for denitrification, which reduced the amount of biogas that could be used as an energy source.…”

Section: Introductionmentioning

confidence: 99%

Denitrification coupled with methane oxidation in a membrane bioreactor after methanogenic pre‐treatment of wastewater

Sánchez

Rodríguez-Hernández

Buntner

et al. 2016

J of Chemical Tech & Biotech

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BACKGROUND The presence of dissolved methane is an important environmental problem related to greenhouse gas emissions from wastewater treated in methanogenic bioreactors. Methane has a global warming potential of 28. For low‐strength wastewaters, such as sewage, dissolved methane could account for up to 50% of the total methane produced. Dissolved methane is easily desorbed from effluents when released into the environment or post‐treated in aerobic bioreactors. The use of dissolved methane as a carbon source for biological denitrification has been proposed as an alternative for reducing both greenhouse gas emissions and nitrogen concentrations in treated wastewater. RESULTS The effluent of a methanogenic reactor operating at ambient temperature was post‐treated in a two‐compartment biological membrane bioreactor (MBR). The first compartment consisted of an anoxic denitrification reactor in which dissolved methane was oxidized. The second compartment was an aerobic membrane filtration reactor. Up to 60% nitrogen removal and 95% methane consumption were observed. Batch experiments indicated the presence of microorganisms that were capable of denitrification using dissolved methane. CONCLUSIONS Denitrification using dissolved methane as a carbon source was feasible in an anoxic–aerobic MBR system. Denitrification resulted from a mixture of aerobic and anaerobic methane oxidizing bacteria, anammox and heterotrophic bacteria activity. © 2016 Society of Chemical Industry

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Denitrification with natural gas and various new growth media

Cited by 47 publications

References 10 publications

Performance of upflow anoxic bioreactor for wastewater treatment

Performance of upflow anoxic bioreactor for wastewater treatment

Development of a Combined Aerobic–Anoxic and Methane Oxidation Bioreactor System Using Mixed Methanotrophs and Biogas for Wastewater Denitrification

Denitrification coupled with methane oxidation in a membrane bioreactor after methanogenic pre‐treatment of wastewater

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