The effect of inorganic carbon on microbial interactions in a biofilm nitritation–anammox process

Ma, Yiwei; Sundar, Suneethi; Park, Hongkeun; Chandran, Kartik

doi:10.1016/j.watres.2014.12.006

Cited by 68 publications

(31 citation statements)

References 31 publications

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“…It seemed that NOB were persistent in the sludge and could not be easily washed out, especially after NOB community had built up to a certain percentage55. In the intermittent aerated-EGSB, NOB in floc sludge was easily washed out for its low settleability.…”

Section: Discussionmentioning

confidence: 99%

In-situ restoration of one-stage partial nitritation-anammox process deteriorated by nitrate build-up via elevated substrate levels

Wang

Gao

2016

Sci Rep

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The one-stage partial nitritation and anammox process (PN/A) has been a promising microbial process to remove ammonia from wastewater especially with low carbon/nitrogen ratio. The main breakdown was the deterioration caused by overgrowth of nitrite oxidizing bacteria (NOB) resulting effluent nitrate build-up in the PN/A process. This study presented an in-situ restoring strategy for suppressing NOB activity in a one-stage granular PN/A system deteriorated over 2 months, using elevated concentrations of substrates (ammonia and nitrite) under limited dissolved oxygen level. The results showed that the NOB activity was successfully suppressed after 56 days of restoration, and finally the ratio of produced nitrate/consumed ammonium was reduced from 36.8% to 7%. On day 66 the nitrogen removal rate obtained as 1.2 kg N/(m3·d). The high FA level (5–40 mg/L) and low dissolved oxygen (<0.13 mg/L) were responsible for NOB suppression. From quantitative PCR (qPCR) analysis, after this restoration, anammox bacteria had a widely growth, and AOB stay stable, but Nitrospira increase and Nitrobacter declined. High amount of NOB was still persistent in the granules, which was not easy to wash-out and threaten the deammonification performance.

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Section: Discussionmentioning

confidence: 99%

In-situ restoration of one-stage partial nitritation-anammox process deteriorated by nitrate build-up via elevated substrate levels

Wang

Gao

2016

Sci Rep

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“…In a recent study, Ma et al (2015) showed that limiting inorganic carbon influenced the microbial ecology of a biofilm and diminished the performance of a biological wastewater process. Ma et al (2015) diminished process performance to a lack of inorganic carbon available for assimilation by autotrophic microorganisms. Thus, the direct influence of inorganic carbon on the development of microbial communities could explain the observed decrease in biofilter performance for alkalinity limited water supplies.…”

Section: Influence Of the Alkalinity To Substrate Ratio On Biofilter mentioning

confidence: 99%

“…Although some researchers (Ma et al, 2015;Netcher and Duranceau, 2015;Ren et al, 2010;Hozalski et al, 1995) note the importance of alkalinity in biological processes, few if any studies have fully examined the role of alkalinity on biofiltration performance when applied as pretreatment for UF membranes. In prior work by the authors (2015), it was suggested that biofilter pretreatment effectiveness may have been influenced by the low alkalinity (2 mg/L as CaCO 3 ) of the natural surface water.…”

Section: Introductionmentioning

confidence: 99%

Modeling the improvement of ultrafiltration membrane mass transfer when using biofiltration pretreatment in surface water applications

Netcher

Duranceau

2016

Water Research

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“…Only a couple of studies have been carried so far (among others Lo et al, 2010;Ma et al, 2015;Todt and D€ orsch, 2015), indicating that significant knowledge gaps still exist. As far as the present authors are aware of, no studies are available on N 2 O emission from IFAS system coupled to MBR and more knowledge is therefore needed.…”

Section: Introductionmentioning

confidence: 99%

Nitrous oxide from moving bed based integrated fixed film activated sludge membrane bioreactors

Mannina

Capodici

Cosenza

et al. 2017

Journal of Environmental Management

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a b s t r a c tThe present paper reports the results of a nitrous oxide (N 2 O) production investigation in a moving bed based integrated fixed film activated sludge (IFAS) membrane bioreactor (MBR) pilot plant designed in accordance with the University of Cape Town layout for biological phosphorous removal. Gaseous and liquid samples were collected in order to measure the gaseous as well as the dissolved concentration of N 2 O. Furthermore, the gas flow rate from each reactor was measured and the gas flux was estimated. The results confirmed that the anoxic reactor represents the main source of nitrous oxide production. A significant production of N 2 O was, however, also found in the anaerobic reactor, thus indicating a probable occurrence of the denitrifying phosphate accumulating organism activity. The highest N 2 O fluxes were emitted from the aerated reactors (3.09 g N 2 OeN m À2 h À1 and 9.87 g N 2 OeN m À2 h À1 , aerobic and MBR tank, respectively). The emission factor highlighted that only 1% of the total treated nitrogen was emitted from the pilot plant. Furthermore, the measured N 2 O concentrations in the permeate flow were comparable with other reactors. Nitrous oxide mass balances outlined a moderate production also in the MBR reactor despite the low hydraulic retention time. On the other hand, the mass balance showed that in the aerobic reactor a constant consumption of nitrous oxide (up to almost 15 mg N 2 O h À1 ) took place, due to the high amount of stripped gas.

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The effect of inorganic carbon on microbial interactions in a biofilm nitritation–anammox process

Cited by 68 publications

References 31 publications

In-situ restoration of one-stage partial nitritation-anammox process deteriorated by nitrate build-up via elevated substrate levels

In-situ restoration of one-stage partial nitritation-anammox process deteriorated by nitrate build-up via elevated substrate levels

Modeling the improvement of ultrafiltration membrane mass transfer when using biofiltration pretreatment in surface water applications

Nitrous oxide from moving bed based integrated fixed film activated sludge membrane bioreactors

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