Greenhouse gases from wastewater treatment — A review of modelling tools

Capodici

Journal of Environmental Management

et al. 2017

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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: Introductionmentioning

confidence: 99%

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

Capodici

Journal of Environmental Management

et al. 2017

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“…Therefore, even for small production amounts it might have a strong impact on carbon footprint. As a result, N 2 O emissions from wastewater treatment has received increasing attention in recent years Mannina et al, 2016a).…”

Section: Introductionmentioning

confidence: 99%

Nitrous oxide emissions in a membrane bioreactor treating saline wastewater contaminated by hydrocarbons

Trapani

et al. 2016

Bioresource Technology

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“…It has already recognized that wastewater treatment can result in direct emissions of greenhouse gases (GHGs) such as carbon dioxide (CO 2 ), methane (CH 4 ) and nitrous oxide (N 2 O), mainly due to the biological processes (Gupta and Singh, 2012;Massara et al, 2017). WWTPs are also responsible for indirect emissions related to power generation, chemicals manufacturing and sludge disposal (Fine and Hadas, 2012;Flores-Alsina et al, 2014;Mannina et al, 2016a). Therefore, GHGs emissions have to be considered, in addition to effluent quality and operational costs, when comparing design alternatives or operation scenarios (Guo et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Greenhouse gas emissions and the links to plant performance in a fixed-film activated sludge membrane bioreactor – Pilot plant experimental evidence

Capodici

et al. 2017

Bioresource Technology

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