Adhesion characteristics of nitrifying bacteria in activated sludge

Larsen, Poul; Nielsen, Jeppe Lund; Svendsen, Tore Christian; Nielsen, Per Halkjær

doi:10.1016/j.watres.2008.02.015

Cited by 74 publications

(42 citation statements)

References 41 publications

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“…9 10 3 mL -1 ) (Delatolla et al 2009;Vlaeminck et al 2010), and the establishment of these colonies may be influenced by the particle size, which is determined by the water shear rate. Larsen et al (2008) showed that increased shear rates in activated sludge systems formed particles smaller than the medium size of a colony (13-22.5 lm) of the ammonia- oxidizing bacteria Nitrosomonas oligotropha, which led to a low rate of ammonia oxidation that was similar to the rate observed in our study. The bacterial counting analysis showed a high quantity of bacillus and coccoid bacteria in the PR treatment when compared to other treatments.…”

Section: Discussionsupporting

confidence: 86%

The use of different aerators on Litopenaeus vannamei biofloc culture system: effects on water quality, shrimp growth and biofloc composition

et al. 2016

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This study evaluated the effects of different aeration types on water quality, shrimp growth and biofloc composition in a Litopenaeus vannamei culture. The study was conducted with three treatments: (1) PR-propeller aspirator pump aerator; (2) VP-vertical pump aerator; and (3) BL-diffused air blower. The study was performed in a greenhouse with nine 35,000-L rectangular tanks. Water quality parameters (temperature, salinity, dissolved oxygen, pH, ammonia, nitrite, nitrate, settleable and suspended solids) were measured along the 33 experimental days. Moreover, samples were collected to quantify the microorganisms present in the tanks. At the end of the study, samples of the biofloc of each tank were collected to proximal analysis. Throughout the experiment, the temperature, pH, salinity and alkalinity were maintained within the recommended levels for L. vannamei. The propeller treatment showed a concentration of total ammonia above the recommended levels and lower densities of ciliates and flagellates, most likely because of inadequate biofloc formation in this treatment. The final weight was higher in the blower and propeller treatments. However, survival was lower in the propeller treatment compared to the other treatments. The results of this study suggest that diffused air systems (air blower) improve the formation of biofloc and growth performance of L. vannamei.

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Section: Discussionsupporting

confidence: 86%

The use of different aerators on Litopenaeus vannamei biofloc culture system: effects on water quality, shrimp growth and biofloc composition

et al. 2016

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“…Larsen et al [144] observed that typical representatives of ammonia and nitrite oxidisers formed strong microcolonies, with Nitrospira spp. being even stronger than Nitrosomonas oligotropha colonies.…”

Section: Nitrification/denitrification Activitymentioning

confidence: 99%

Membrane fouling in membrane bioreactors—Characterisation, contradictions, cause and cures

Drews

2010

Journal of Membrane Science

799

329

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“…Matsumoto et al (2010) assumed that nitrifiers did not produce EPS while EPS formation was mainly produced by heterotrophic bacteria in their modeling of nitrifying system. However, nitrifiers have been shown to produce EPS experimentally (Larsen et al, 2008;Ni et al, 2008a). Thus, in this work, we consider that nitrifiers should be the source of EPS formation in an autotrophic based system as they are the dominated active biomass fractions.…”

Section: Modelingmentioning

confidence: 99%

Evaluation on factors influencing the heterotrophic growth on the soluble microbial products of autotrophs

Zeng

Fang

et al. 2010

Biotech & Bioengineering

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In this work, the heterotrophic growth on the microbial products of autotrophs and the effecting factors were evaluated with both experimental and modeling approaches. Fluorescence in situ hybridization (FISH) analysis illustrated that ammonia oxidizers (AOB), nitrite oxidizers (NOB), and heterotrophs accounted for about 65%, 20%, and 15% of the total bacteria, respectively. The mathematical evaluation of experimental data reported in literature indicated that heterotrophic growth in nitrifying biofilm (30-50%) and granules (30%) was significantly higher than that of nitrifying sludge (15%). It was found that low influent ammonium resulted in a lower availability of soluble microbial products (SMP) and a slower heterotrophic growth, but high ammonium (>150 mg N L(-1)) feeding would lead to purely AOB dominated sludge with high biomass-associated products contained effluent, although the absolute heterotrophic growth increased. Meanwhile, the total active biomass concentration increased gradually with the increasing solids retention time, whereas the factions of active AOB, NOB, and heterotrophs varied a lot at different solids retention times. This work could be useful for better understanding of the autotrophic wastewater treatment systems.

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Adhesion characteristics of nitrifying bacteria in activated sludge

Cited by 74 publications

References 41 publications

The use of different aerators on Litopenaeus vannamei biofloc culture system: effects on water quality, shrimp growth and biofloc composition

The use of different aerators on Litopenaeus vannamei biofloc culture system: effects on water quality, shrimp growth and biofloc composition

Membrane fouling in membrane bioreactors—Characterisation, contradictions, cause and cures

Evaluation on factors influencing the heterotrophic growth on the soluble microbial products of autotrophs

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