A comparison between ethanol and methanol as carbon sources for denitrification

Christensson, Magnus; Lie, Ewa; Welander, Thomas

doi:10.2166/wst.1994.0255

Cited by 116 publications

(53 citation statements)

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“…(ii) Types of carbon sources The availability of different types of carbon sources may enrich different groups of bacteria and have different impacts on denitrification efficiency [87,88]. Methanol, ethanol and acetate, and to a lesser extent glycerol or sludge fermentates, are widely used as supplemented carbon sources for enhancing denitrification in BNR plants.…”

Section: Key Process Conditions Leading To Nitrous Oxide Emissionsmentioning

confidence: 99%

Nitrous oxide emissions from wastewater treatment processes

Law

Pan

et al. 2012

Phil. Trans. R. Soc. B

386

283

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Nitrous oxide (N 2 O) emissions from wastewater treatment plants vary substantially between plants, ranging from negligible to substantial (a few per cent of the total nitrogen load), probably because of different designs and operational conditions. In general, plants that achieve high levels of nitrogen removal emit less N 2 O, indicating that no compromise is required between high water quality and lower N 2 O emissions. N 2 O emissions primarily occur in aerated zones/compartments/periods owing to active stripping, and ammonia-oxidizing bacteria, rather than heterotrophic denitrifiers, are the main contributors. However, the detailed mechanisms remain to be fully elucidated, despite strong evidence suggesting that both nitrifier denitrification and the chemical breakdown of intermediates of hydroxylamine oxidation are probably involved. With increased understanding of the fundamental reactions responsible for N 2 O production in wastewater treatment systems and the conditions that stimulate their occurrence, reduction of N 2 O emissions from wastewater treatment systems through improved plant design and operation will be achieved in the near future.

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Section: Key Process Conditions Leading To Nitrous Oxide Emissionsmentioning

confidence: 99%

Nitrous oxide emissions from wastewater treatment processes

Law

Pan

et al. 2012

Phil. Trans. R. Soc. B

386

283

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“…Methanol is the most commonly employed external carbon source due to being easily assimilated by denitrifying bacteria and its low cost [10,11,12,13,14]. Ethanol and acetic acid constitute other equivalent commercial sources [5,15,16].…”

Section: Introductionmentioning

confidence: 99%

Denitrification of high nitrate concentration wastewater using alternative carbon sources

Fernández-Nava

Marañón

Soons

et al. 2010

Journal of Hazardous Materials

191

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The use of different organic carbon sources in the denitrification of wastewater containing 2500 mg nitrates/L in a SBR was studied. Three alternative sources of carbon were tested: wastewater from a sweet factory, a residue from a soft drinks factory and a residue from a dairy plant. The first two are sugar rich, whereas the third presents a high content in lactic acid. Maximum specific denitrification rates of between 42 and 48 mg NO 3 -N/g VSS·h were obtained. The effluents were nitrate free and very low COD concentrations were obtained in 4-6 hours reaction time, especially with the sugar-rich carbon sources. The values of the denitrifier net yield coefficient were higher than when using methanol (0.93-1.75 g VSS formed /g NOx-N reduced ). The lowest value was obtained using the lactic acid-rich residue. The optimum COD/N ratios varied between 4.6 for the lactic acid-rich carbon source and 5.5 -6.5 for the sugar-rich carbon sources.

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“…The nature and the amount of the organic substrate used as exogenous carbon source plays an important role in the success and price of denitrification. Various substrates have been used in many studies and a whole variety of compounds, mostly methanol [3,8,9], acetate [4,6,7], and ethanol [10]. Some studies used nutrient broth [11] and tryptic soy broth [12].…”

Section: Introductionmentioning

confidence: 99%

Wastewater denitrification process—the influence of methanol and kinetic analysis

Foglar

Briški

2003

Process Biochemistry

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The aim of this work was to achieve rapid nitrate removal from synthetic wastewater (SW) without nitrite accumulation and to improve the economic effectiveness of the process. For that purpose, experiments were carried out to determine the influence of methanol on denitrification rate in batch assays and in the continuous-flow stirred cultures. Nitrate Á/N (200 mgNO 3 ( Á/N/l) was reduced under anoxic conditions during approximately 4 Á/6 h for the MeOH/NO 3 ( Á/N ratio above 2.5. Nitrite concentration was elevated to the maximum of 1.2 mgNO 2 ( Á/N/l and at the end of the tests nitrite concentrations were 0.06 Á/0.1 mgNO 2 ( Á/N/l. At lower MeOH/NO 3 ( Á/N ratios the denitrification process stopped after exhaustion of methanol. The analysis of experimental results showed that denitrification was a zero-order reaction with respect to nitrate and a first-order reaction with respect to the biomass concentration (the first-order overall reaction). In the continuous denitrification process during 45 days the hydraulic retention time (HRT) was decreased from 62 to 28 h. Dissolved oxygen concentration fell from 5.50 to 0.40 mgO 2 /l during the first 4 h, but over 3 days of continuous flow it increased to 2.5 mgO 2 /l and remained at that level. Accumulation of nitrite ions in SW was similar to that in batch tests, but at an HRT of 28 h the nitrite concentration increased to 6 mgNO 2 ( Á/N/l. Complete denitrification at 25 8C was achieved at nitrate and methanol loading rates of 4.35 mgNO 3 ( Á/N/l h and 23 mgO 2 /l h, respectively.

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A comparison between ethanol and methanol as carbon sources for denitrification

Cited by 116 publications

References 0 publications

Nitrous oxide emissions from wastewater treatment processes

Nitrous oxide emissions from wastewater treatment processes

Denitrification of high nitrate concentration wastewater using alternative carbon sources

Wastewater denitrification process—the influence of methanol and kinetic analysis

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