Novel microbial nitrogen removal processes

Khin, Than; Annachhatre, Ajit P.

doi:10.1016/j.biotechadv.2004.04.003

Cited by 273 publications

(144 citation statements)

References 60 publications

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“…However, additional nitrite-N is necessary for anammox reaction and the cultivation of the anammox bacteria is difficult [2]. Besides, the nitrification/denitrification process need two stages starting with nitrification, which is the aerobic oxidation of ammonia-N to nitrite-N or nitrate-N, followed by heterotrophic denitrification under anaerobic conditions [3].…”

Section: Introductionmentioning

confidence: 99%

Anodic ammonia oxidation to nitrogen gas catalyzed by mixed biofilms in bioelectrochemical systems

Zhan

Zhang

Tao

et al. 2014

Electrochimica Acta

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Section: Introductionmentioning

confidence: 99%

Anodic ammonia oxidation to nitrogen gas catalyzed by mixed biofilms in bioelectrochemical systems

Zhan

Zhang

Tao

et al. 2014

Electrochimica Acta

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“…In this way, Anammox combined with partial nitritation (partial nitritation-Anammox), a completely autotrophic nitrogen removal technology is achieved. Compared with the conventional biological treatment technologies, the process may have promising technical and economic advantages for landfill leachate treatment because of less oxygen consumption, no organic source addition and low sludge production [19,20].…”

Section: Introductionmentioning

confidence: 99%

Landfill leachate treatment with a novel process: Anaerobic ammonium oxidation (Anammox) combined with soil infiltration system

Zhu

Liu

2008

Journal of Hazardous Materials

122

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A novel combined process was proposed to treat municipal landfill leachate with high concentrations of ammonium and organics. This process consisted of a partial nitritation reactor (PNR), an anaerobic ammonium oxidation (Anammox) reactor (AR) and two underground soil infiltration systems (USIS-1 and USIS-2). Based on the optimum operating conditions obtained from batch tests of individual unit, the combined process was continuously operated on a bench scale for 166 days. Partial nitritation was performed in a fixed bio-film reactor (PNR, working volume = 12 L). Ammonium nitrogen-loading rate (Nv) and DO were combined to monitor partial nitritation, and at T = 30 ± 1• C, Nv = 0.27-1.2 kg/(m 3 ·d), The test results indicated that the combined system could work stably over a long period under the operating conditions, and that the process was feasible for the leachate treatment. AR should be the key to the performance of the combined process.

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“…Treatment of wastewater with high ammonium strength has become a matter of serious concern in the recent days (Verstraete and Philips, 1998;Khin and Annachhatre, 2004;Ahn, 2006). A representative example is the highly concentrated ammonia removal from the municipal landfill leachates, food processing wastewater, liquid wastes from animal production plants, condensates from fertilizer plants, and the supernatant from anaerobic sludge digesters, where the ammonia content can reach 600-1000 mg NH 4 + -N/ L Fux et al, 2006;Galí et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

Influence of dissolved oxygen concentration and aeration time on nitrite accumulation in partial nitrification process

Guo

Kim²,

Behera

et al. 2008

Int. J. Environ. Sci. Technol.

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This study investigated the influence of dissolved oxygen concentration and aeration time on nitrification and nitrite accumulation in an attempt to optimize the recently developed biological-partial-nitritation process for the treatment of strong nitrogen wastewaters. Investigation of dissolved oxygen concentration on ammonium and nitrite oxidation was carried out in a batch reactor. The dissolved oxygen concentration of 0.5 mg O 2 /L inhibited both ammonium as well as nitrite oxidation, while increase of dissolved oxygen concentration to ~1 mg O 2 /L increased the ammonium oxidation rate and was comparable to that at higher dissolved oxygen concentrations. Experiments were carried out in a sequencing batch reactor for more than 100 days to investigate the influence of aeration time on nitrite accumulation. The dissolved oxygen concentration was controlled at ~1.0 mg O 2 /L (in the range of 0.8-1.5 mg/L) during the aeration stage, and volatile suspended solid was maintained at 2.0 g/L while temperature and pH were 30±1ºC and 8.3±0.1, respectively. In a typical cycle, complete nitrification occurred at aeration time longer than 6 h. When the aeration time was reduced to 4 h., ~80 % of partial nitritation was achieved. With a further reduction in aeration time to 3 h., nearly 1:1 nitrite/ammonium ratio was yielded. This result revealed that for the reactor design, aeration time determined by feasibility experiments must be considered based on the nitrogen strength in wastewater and biomass concentration in the reactor with dissolved oxygen concentration of ~1.0 mg O 2 /L for satisfactory partial nitrification with subsequent processes such as anaerobic ammonium oxidation.

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Novel microbial nitrogen removal processes

Cited by 273 publications

References 60 publications

Anodic ammonia oxidation to nitrogen gas catalyzed by mixed biofilms in bioelectrochemical systems

Anodic ammonia oxidation to nitrogen gas catalyzed by mixed biofilms in bioelectrochemical systems

Landfill leachate treatment with a novel process: Anaerobic ammonium oxidation (Anammox) combined with soil infiltration system

Influence of dissolved oxygen concentration and aeration time on nitrite accumulation in partial nitrification process

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