Contributions of biofilm and suspended sludge to nitrogen transformation and nitrous oxide emission in hybrid sequencing batch system

Lo, Ing-Wei; Lo, K.V.; Mavinic, Donald S.; Shiskowski, Dean; Ramey, William D.

doi:10.1016/s1001-0742(09)60204-7

Cited by 71 publications

(22 citation statements)

References 25 publications

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“…Todt and D€ orsch (2015) found an emission factor ranging between 0.7% and 8.5% in a pure MBBR system; Kong et al (2013) reported a mean emission factor equal to 2.7% in an MBBR operated with intermittent aeration; Lo et al (2010) found an emission factor equal to 21% of nitrogen load in an IFAS system operated with intermittent aeration. However, Fig.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

“…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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“…NH 4 + -N and TN removal efficiencies were 96.6% and 77.2%, respectively, with an average COD intra efficiency of 80.1% ( Fig.2B and C). The high COD intra led to efficient N and P removal in the SBR by facilitating endogenous denitrification and phosphorus removal (SND efficiency was 47.7%, calculated by Lo et al (2010)). …”

Section: C N and P Removal Performance Of The Sndpr-pd Systemmentioning

confidence: 99%

Combining simultaneous nitrification-endogenous denitrification and phosphorus removal with post-denitrification for low carbon/nitrogen wastewater treatment

Wang

Zhao

et al. 2016

Bioresource Technology

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“…Correspondingly, a hybrid environment with an aerobic environment on the surface and an anoxic/anaerobic microenvironment inside the biofilm are formed. 15 The performance was affected by many operating factors, such as salinity, 16 synthetic toxic organics, 17 influent nitrogen concentration and DO condition, 18 but efficient SND performance was achieved in SBBR systems for saline wastewater treatment. However, few studies have focused on the performance and microbial pathway of SND in SBBR systems treating saline wastewater with coastal seawater.…”

Section: Introductionmentioning

confidence: 99%

Intensification and microbial pathways of simultaneous nitrification–denitrification in a sequencing batch biofilm reactor for seawater‐based saline wastewater treatment

Feng

Yang

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND The optimum condition and potential mechanism of simultaneous nitrification–denitrification (SND) in a sequencing batch biofilm reactor (SBBR) have not been fully classified under salinity stress using real coastal seawater. In this study, a SBBR system under salinity stress was operated to optimize SND performance by changing the intermittent aeration intensity and drainage ratio (DR), and the microbial pathway of optimum SND was examined. RESULTS Results showed that the increase in salinity with coastal seawater ratio of no more than 50% obviously decreased SND efficiency from 66.4 ± 7.3% to 51.3 ± 7.4% mainly due to the decline of denitrification activity. The optimum SND performance of 68.1 ± 7.6% was observed when dissolve oxygen (DO) level decreased from 5.55 ± 0.31 mg L−1to 2.21 ± 0.42 mg L−1 in the aerobic phase of intermittent aeration and DR increased from 0.14 to 0.23. More functional bacteria including anoxic and aerobic denitrifiers coexisted under the optimum condition. Also, heterotrophic nitrifiers rather than autotrophic nitrifiers mainly contributed to nitrification under salinity stress in the optimum system. CONCLUSIONS A SBBR system showed efficient SND under salinity stress by control of DR and intermittent aeration intensity due to the enhancement of functional bacteria including anoxic and aerobic denitrifiers and heterotrophic nitrifiers. © 2018 Society of Chemical Industry

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Contributions of biofilm and suspended sludge to nitrogen transformation and nitrous oxide emission in hybrid sequencing batch system

Cited by 71 publications

References 25 publications

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

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

Combining simultaneous nitrification-endogenous denitrification and phosphorus removal with post-denitrification for low carbon/nitrogen wastewater treatment

Intensification and microbial pathways of simultaneous nitrification–denitrification in a sequencing batch biofilm reactor for seawater‐based saline wastewater treatment

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