Partial nitrification and nitrous oxide emission in an intermittently aerated sequencing batch biofilm reactor

Kong, Qiang; Zhang, Jian; Miao, Ming; Lin, Tian; Guo, Na; Liang, Shuang

doi:10.1016/j.cej.2012.10.093

Cited by 70 publications

(19 citation statements)

References 29 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%

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%

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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“…Some ammonia-oxidizing bacteria (AOB) reduce NO 2 -to N 2 O or N 2 through a process called nitrifier denitrification (Tallect et al, 2006;Wrage et al, 2001;Colliver and Stephenson, 2000). Many studies have been conducted to estimate N 2 O emission rate of PN processes (Kong et al, 2013a;Kong et al, 2013b;Okabe et al, 2011;Law et al, 2011;Desloover et al, 2011;de Graff et al, 2010;Kampscheur et al, 2008). In contrast, there are few studies on N 2 O production pathways.…”

Section: Introductionmentioning

confidence: 99%

“…In contrast, there are few studies on N 2 O production pathways. Nitrifier denitrification was the key biological pathway of N 2 O production in an intermittently aerated sequencing batch biofilm reactor for PN treating synthetic ammonium-rich wastewater (Kong et al, 2013b) while NH 2 OH oxidation pathway was the main source of N 2 O in a sequencing batch reactor (SBR) for PN (PN-SBR) (Law et al, 2011;Yang et al, 2009). To determine 5 which pathway is responsible for N 2 O production in a wastewater treatment process is still challenging, because a variety of operational parameters (concentrations and loading rates of nitrogenous compounds, dissolved oxygen (DO) and organic carbon, pH, a ratio of organic carbon and nitrogenous compounds (COD/N) and temperature) influence N 2 O production in a PN process (Tallec et al, 2006;Kampschreur et al, 2009b;Desloover et al, 2012;Wunderlin et al, 2012;Law et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Source identification of nitrous oxide on autotrophic partial nitrification in a granular sludge reactor

et al. 2013

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Emission of nitrous oxide (N 2 O) during biological wastewater treatment is of growing concern since N 2 O is a major stratospheric ozone-depleting substance and an important greenhouse gas. The emission of N 2 O from a lab-scale granular sequencing batch reactor (SBR) for partial nitrification (PN) treating synthetic wastewater without organic carbon was therefore determined in this study, because PN process is known to produce more N 2 O than conventional nitrification processes. The average N 2 O emission rate from the SBR was 0.32 ± 0.17 mg-N L -1 h -1 , corresponding to the average emission of N 2 O of 0.8 ± 0.4% of the incoming nitrogen load (1.5 ± 0.8% of the converted NH 4 + ). Analysis of dynamic concentration profiles during one cycle of the SBR operation demonstrated that N 2 O concentration in off-gas was the highest just after starting aeration whereas N 2 O concentration in effluent was gradually increased in the initial 40 min of the aeration period and was decreased thereafter. Isotopomer analysis was conducted to identify the main N 2 O production pathway in the reactor during one cycle. The hydroxylamine (NH 2 OH) oxidation pathway accounted for 65% of the total N 2 O production in the initial phase during one cycle, whereas contribution of the NO 2 -reduction pathway to N 2 O production was comparable with that of the NH 2 OH oxidation pathway in the latter phase. In addition, 3 spatial distributions of bacteria and their activities in single microbial granules taken from the reactor were determined with microsensors and by in situ hybridization. Partial nitrification occurred mainly in the oxic surface layer of the granules and ammonia-oxidizing bacteria were abundant in this layer. N 2 O production was also found mainly in the oxic surface layer. Based on these results, although N 2 O was produced mainly via NH 2 OH oxidation pathway in the autotrophic partial nitrification reactor, N 2 O production mechanisms were complex and could involve multiple N 2 O production pathways.

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“…Many successful cases of partial nitrification have been reported for SBBRs. There are few reports about partial nitrification conducted in an intermittently aerated SBBR . SBBRs are spatially heterogeneous, providing space for both aerobic and anaerobic processes.…”

Section: Membrane Biofilm Reactorsmentioning

confidence: 99%

A review on the advances in nitrifying biofilm reactors and their removal rates in wastewater treatment

Chaali

Naghdi

Brar

et al. 2018

J of Chemical Tech & Biotech

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Growing demand for efficient wastewater treatment systems is spurring on the development of new technologies. Biofilm‐based reactors can be used for the treatment of a variety of wastewaters and these reactors are resistant to toxic environments. Bioreactors, such as sequencing batch biofilm and moving bed biofilm are advanced techniques to treat various types of wastewaters with diverse operating conditions. Ammonium oxidizing bacteria, nitrite oxidizing bacteria and Anammox (anaerobic ammonium oxidation) bacteria are reported to be responsible for nutrient removal. In recent decades, the performance of these systems has been studied widely and compared for a number of wastewater treatment applications. In general, they are particularly suitable for high‐rate nitrification and nitrogen removal. The efficiency of these reactors has been confirmed in the laboratory and large‐scale plants. Their efficiency depends on the surface area of the biocarrier, the filling percentage volume of biofilm carriers, organic loading and diffused aeration supply. Chemical oxygen demand removal of 50–98% was reported for <12 h hydraulic retention time, 0.2 to 6.5 mg L−1 dissolved oxygen concentration and temperature range 15–35 °C. Also, the ratio of nitrate to ammonium conversion was from 0.2 to 90 and N2 conversion was from 0 to 8.5 mg. This review studied each of these bioreactors in the removal of nutrients (nitrogen, phosphorus and oxygen) from different wastewaters and compared them to conventional treatment. The review also includes the relevant studies on laboratory and pilot‐scale bioreactors to enhance their performance and reduce their costs. © 2018 Society of Chemical Industry

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Partial nitrification and nitrous oxide emission in an intermittently aerated sequencing batch biofilm reactor

Cited by 70 publications

References 29 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

Source identification of nitrous oxide on autotrophic partial nitrification in a granular sludge reactor

A review on the advances in nitrifying biofilm reactors and their removal rates in wastewater treatment

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