Nitrification kinetics in activated sludge at various temperatures and dissolved oxygen concentrations

Charley, Robert C.; Hooper, D.G.; McLee, A.G.

doi:10.1016/0043-1354(80)90002-0

Cited by 68 publications

(14 citation statements)

References 9 publications

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“…In that work, nitrate concentration in tilapia tanks reached 250 mg N/L after 11 wk despite the tanks being seeded with 350 mg/L of bioflocs and fed daily with low‐protein (24%) diets. Assimilation and nitrification occur simultaneously in many activated sludge process units that treat domestic and industrial wastewater (Charley et al 1980; Tchobanoglous et al 2003).…”

Section: Discussionmentioning

confidence: 99%

Effects of Organic Carbon Addition in Controlling Inorganic Nitrogen Concentrations in a Biofloc System

Nootong

Pavasant

Powtongsook³

2011

J World Aquaculture Soc

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The daily addition of tilapia feed and tapioca starch at the C : N weight ratio of 16:1 was conducted to examine the effectiveness of biofloc‐mediated assimilation and nitrification in the zero‐water exchange tilapia cultivation tanks. Inorganic nitrogen concentrations in treatment tanks receiving feed and tapioca starch indicated profiles, which resembled the start‐up of biofilters. Assimilation was essential for the control of inorganic nitrogen concentrations prior to the occurrence of complete nitrification as confirmed by an increase in suspended solids concentration from 52 to 1180 mg SS/L, a slower rate of total ammonia nitrogen (TAN) and nitrite accumulation, and lower concentrations of TAN and nitrite relative to those in control tanks receiving only feed addition. Effective control of inorganic nitrogen concentrations (i.e., TAN and NO2‐N <1.0 mg N/L) was observed in both systems when complete nitrification was established after approximately 6–7 wk regardless of starch supplementation. Results from the nitrogen mass balance suggested that nitrification and, to a lesser extent, assimilation were responsible for inorganic nitrogen control in treatment tanks.

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Section: Discussionmentioning

confidence: 99%

Effects of Organic Carbon Addition in Controlling Inorganic Nitrogen Concentrations in a Biofloc System

Nootong

Pavasant

Powtongsook³

2011

J World Aquaculture Soc

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“…Inhibition of growth of Nitrobacter cultures was observed under elevated oxygen concentrations (9). Rapid ammonium accumulation upon a sudden increase of the oxygen concentration was observed during mixed culture experiments; however, acclimatization of nitrifiers to high oxygen concentrations was observed (3,15). The mechanism of the observed inhibition is unknown, but it might be speculated that accumulation of free radicals plays a role.…”

Section: Discussionmentioning

confidence: 99%

Microelectrode Measurements of the Activity Distribution in Nitrifying Bacterial Aggregates

Beer¹,

Heuvel²,

Ottengraf³

1993

Appl Environ Microbiol

139

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Microelectrodes for ammonium, oxygen, nitrate, and pH were used to study nitrifying aggregates grown in a fluidized-bed reactor. Local reactant fluxes and distribution of microbial activity could be determined from the microprofiles. The interfacial fluxes of the reactants closely reflected the stoichiometry of bacterial nitrification. Both ammonium consumption and nitrate production were localized in the outer shells, with a thickness of approximately 100 to 120 ,m, of the aggregates. Under conditions in which ammonium and oxygen

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“…Temperature affects wastewater treatment in many ways, both directly and indirectly affecting the biological activity. There is an apparent optimal temperature or range of temperatures for any organism, and the optimal temperature for growth will not necessarily be the same as the optimal temperature for substrate oxidation and/or reduction ( Charley et al, 1980 ). A wide array of factors are affected by temperature, such as electron donor or acceptor availability, the chemical form of the substrate at given temperatures and pHs, sensitivities to inhibitors at different concentrations, and efficiency of enzymes involved.…”

Section: Introduction—literature Reviewmentioning

confidence: 99%

Functional Biodiversity of Microbial Communities in Aerobic Selector Slaughterhouse Wastewater

Al-Mutairi¹

2007

Water Environment Research

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The biodiversity of the microbial communities of an aerobic selector and a conventional system treating slaughterhouse wastewater were evaluated using the Biolog technique (Biolog Inc., Hayward, California). Principal components analysis of patterns and level of microbial activity indicate that microbial communities statistically differentiate between the selector and conventional system. Biolog data indicated that there was seasonal variation in the structure and function of the microbial community in conventional samples, which may be a useful indicator of wastewater community disturbance and unsteadiness, while, for the selector system, there were no recognizable statistical differences between winter and summer data communities.Biodiversity indices indicated that the selector system maintained a high functional diversity (Shannon-Weaver diversity index [H9] from 3.8 to 4.6) than the conventional system (H9 from 1.8 to 2.8). The high values in the selector system were a reflection of the fact that most of the carbon sources were used, contributing to the very high Shannon indices. In addition, the high substrate equitability values (J) obtained for the selector samples indicated that the microbial communities between the summer and winter samples used the carbon sources in the same proportion. In contrast, differences in the equitability of the microbial communities within the conventional system were observed. This indicated a pattern representing unevenness. Water Environ. Res., 79, 660 (2007).

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Nitrification kinetics in activated sludge at various temperatures and dissolved oxygen concentrations

Cited by 68 publications

References 9 publications

Effects of Organic Carbon Addition in Controlling Inorganic Nitrogen Concentrations in a Biofloc System

Effects of Organic Carbon Addition in Controlling Inorganic Nitrogen Concentrations in a Biofloc System

Microelectrode Measurements of the Activity Distribution in Nitrifying Bacterial Aggregates

Functional Biodiversity of Microbial Communities in Aerobic Selector Slaughterhouse Wastewater

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