Methane and nitrous oxide emissions following anaerobic digestion of sludge in Japanese sewage treatment facilities

Oshita, Kazuyuki; Okumura, Takuya; Takaoka, Masaki; Fujimori, Takashi; Appels, Lise; Dewil, Raf

doi:10.1016/j.biortech.2014.08.081

Cited by 41 publications

(15 citation statements)

References 20 publications

(25 reference statements)

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“…Most studies have focused on measuring N2O emissions from wastewater treatment reactors, and EFs vary over several orders of magnitude (0.001% to 9.29% as kg N2O-N (TN influent) -1 ). N2O emissions from reject water treatment tend to be at the higher end of the EFs range for wastewater treatment reactors (Gustavsson and la Cour Jansen, 2011;Kampschreur et al, 2008;Schaubroeck et al, 2015), whereas EFs for sludge management (Oshita et al, 2014) tend to be at the lower end (Fig. 7).…”

Section: Plant-integrated N 2 O Emission Rates and Emission Factorsmentioning

confidence: 99%

Greenhouse gas emission quantification from wastewater treatment plants, using a tracer gas dispersion method

Delre

Mønster

Scheutz

2017

Science of The Total Environment

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Plant-integrated methane (CH) and nitrous oxide (NO) emission quantifications were performed at five Scandinavian wastewater treatment plants, using a ground-based remote sensing approach that combines a controlled release of tracer gas from the plant with downwind concentration measurements. CH emission factors were between 1 and 21% of CH production, and between 0.2 and 3.2% of COD influent. The main CH emitting sources at the five plants were sludge treatment and energy production units. The lowest CH emission factors were obtained at plants with enclosed sludge treatment and storage units. NO emission factors ranged from <0.1 to 5.2% of TN influent, and from <0.1 to 5.9% of TN removed. In general, measurement-based, site-specific CH and NO emission factors for the five studied plants were in the upper range of the literature values and default emission factors applied in international guidelines. This study showed that measured CH and NO emission rates from wastewater treatment plants were plant-specific and that emission rates estimated using models in current guidelines, mainly meant for reporting emissions on the country scale, were unsuitable for Scandinavian plant-specific emission reporting.

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Section: Plant-integrated N 2 O Emission Rates and Emission Factorsmentioning

confidence: 99%

Greenhouse gas emission quantification from wastewater treatment plants, using a tracer gas dispersion method

Delre

Mønster

Scheutz

2017

Science of The Total Environment

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“…These units contribute to around 72% of methane emissions of the WWTPs while the remaining emissions come from the biological reactors and can be mainly attributed to the CH 4 dissolved in the wastewater which is not totally removed by the biological system. Research works of Yver Kwok et al [22] and Oshita et al [23] also showed that most of the methane emissions from WWTPs are closely related to processes involved in the sludge line.…”

Section: Introductionmentioning

confidence: 99%

Greenhouse Gases Emissions from Wastewater Treatment Plants: Minimization, Treatment, and Prevention

Campos

Valenzuela-Heredia

Pedrouso

et al. 2016

Journal of Chemistry

141

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The operation of wastewater treatment plants results in direct emissions, from the biological processes, of greenhouse gases (GHG) such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O), as well as indirect emissions resulting from energy generation. In this study, three possible ways to reduce these emissions are discussed and analyzed:(1)minimization through the change of operational conditions,(2)treatment of the gaseous streams, and(3)prevention by applying new configurations and processes to remove both organic matter and pollutants. In current WWTPs, to modify the operational conditions of existing units reveals itself as possibly the most economical way to decrease N2O and CO2emissions without deterioration of effluent quality. Nowadays the treatment of the gaseous streams containing the GHG seems to be a not suitable option due to the high capital costs of systems involved to capture and clean them. The change of WWTP configuration by using microalgae or partial nitritation-Anammox processes to remove ammonia from wastewater, instead of conventional nitrification-denitrification processes, can significantly reduce the GHG emissions and the energy consumed. However, the area required in the case of microalgae systems and the current lack of information about stability of partial nitritation-Anammox processes operating in the main stream of the WWTP are factors to be considered.

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“…[31] Considering N 2 O and CH 4 , digestate can give rise to significant emission rates into the atmosphere: however, these emissions are generally lower than untreated biomass. [53] As for nitrous oxide, digested products are more recalcitrant than fresh slurry; thus, microbial degradation is slower, in which leads to relatively few anoxic microsites and poor N 2 O emission compared to fresh slurry application. [54][55][56] Conversely, methane emissions from digestate are generally lower than those of original biomass, since the methanogenic potential is reduced: this is particularly relevant in the presence of reduced methane coming from manure [26,45] (Poeschl et al, 2012; Boulamanti et al, 2013).…”

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confidence: 99%

Environmental impact of biogas: A short review of current knowledge

Paolini

Petracchini

Segreto

et al. 2018

Journal of Environmental Science and Health, Part A

273

110

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The social acceptance of biogas is often hampered by environmental and health concerns. In this study, the current knowledge about the impact of biogas technology is presented and discussed. The survey reports the emission rate estimates of the main greenhouse gases (GHG), namely CO, CH and NO, according to several case studies conducted over the world. Direct emissions of gaseous pollutants are then discussed, with a focus on nitrogen oxides (NO); evidences of the importance of suitable biomass and digestate storages are also reported. The current knowledge on the environmental impact induced by final use of digestate is critically discussed, considering both soil fertility and nitrogen release into atmosphere and groundwater; several case studies are reported, showing the importance of NH emissions with regards to secondary aerosol formation. The biogas upgrading to biomethane is also included in the study: with this regard, the methane slip in the off-gas can significantly reduce the environmental benefits.

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Methane and nitrous oxide emissions following anaerobic digestion of sludge in Japanese sewage treatment facilities

Cited by 41 publications

References 20 publications

Greenhouse gas emission quantification from wastewater treatment plants, using a tracer gas dispersion method

Greenhouse gas emission quantification from wastewater treatment plants, using a tracer gas dispersion method

Greenhouse Gases Emissions from Wastewater Treatment Plants: Minimization, Treatment, and Prevention

Environmental impact of biogas: A short review of current knowledge

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