Evaluation of process conditions triggering emissions of green-house gases from a biological wastewater treatment system

Rodríguez-Caballero, A.; Aymerich, I.; Poch, M.; Pijuan, Maite

doi:10.1016/j.scitotenv.2014.06.015

Cited by 79 publications

(36 citation statements)

References 29 publications

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“…Most studies addressing N 2 O emissions have focused on monitoring conventional activated sludge WWTPs (Daelman et al, 2015;Law et al, 2012b;Rodriguez-Caballero et al, 2014) and few of them were conducted on fully nitrifying processes (Desloover et al, 2011;Law et al, 2011;Tallec et al, 2006b). The only study reporting N 2 O emissions from a nitrifying biofilter was conducted through lab-scale experiments by Tallec et al (2006b).…”

Section: Emission Factormentioning

confidence: 99%

“…Recent long-term monitoring studies reported average emission factors (EFs) of 0.12% (Rodriguez-Caballero et al, 2014) and 2.80% (Daelman et al, 2015) and shed light on the high temporal variability of the emissions. This discrepancy in the published data is probably due to differences in plant configurations and operational conditions.…”

Section: Introductionmentioning

confidence: 99%

“…An increased nitrogen load is suspected of promoting a shift in metabolism from a low hydroxylamine oxidation activity towards the maximum activity inducing higher N 2 O emissions (Chandran et al, 2011;Yu et al, 2010). In addition to environmental parameters, such as pH and temperature, transient shifts in operating conditions have been identified as promoting N 2 O production (Chandran et al, 2011;Rodriguez-Caballero et al, 2014). The latter factor could be explained by either a disturbance of bacterial metabolism or the fact that such transitions will lead to a build-up of N 2 O production pathway intermediates such as nitrite, hydroxylamine and ammonium.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

N2O emissions from full-scale nitrifying biofilters

Bollon¹,

Filali²,

Fayolle³

et al. 2016

Water Research

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Section: Emission Factormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

N2O emissions from full-scale nitrifying biofilters

Bollon¹,

Filali²,

Fayolle³

et al. 2016

Water Research

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“…In addition to being explosive at low concentrations, CH 4 is a major greenhouse gas with a life span of ϳ12 years and a global warming potential roughly 21 to 23 times higher than that of carbon dioxide (11). Recent reports suggest that CH 4 emissions from sewers contribute significantly to the total greenhouse gas footprint of wastewater systems (12,13). Accordingly, different mitigation strategies have been used to reduce H 2 S and CH 4 production in sewers (14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24).…”

mentioning

confidence: 99%

Changes in Microbial Biofilm Communities during Colonization of Sewer Systems

Auguet

Pijuan

Batista

et al. 2015

Appl Environ Microbiol

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bThe coexistence of sulfate-reducing bacteria (SRB) and methanogenic archaea (MA) in anaerobic biofilms developed in sewer inner pipe surfaces favors the accumulation of sulfide (H 2 S) and methane (CH 4 ) as metabolic end products, causing severe impacts on sewerage systems. In this study, we investigated the time course of H 2 S and CH 4 production and emission rates during different stages of biofilm development in relation to changes in the composition of microbial biofilm communities. The study was carried out in a laboratory sewer pilot plant that mimics a full-scale anaerobic rising sewer using a combination of process data and ). This contrasting trend coincided with a stable SRB community and an archaeal community composed solely of methanogens derived from the human gut (i.e., Methanobrevibacter and Methanosphaera). In turn, CH 4 emissions increased after 1 year of biofilm growth (327.6 ؎ 16.6 mg COD-CH 4 liter ؊1 day ؊1 ), coinciding with the replacement of methanogenic colonizers by species more adapted to sewer conditions (i.e., Methanosaeta spp.). Our study provides data that confirm the capacity of our laboratory experimental system to mimic the functioning of full-scale sewers both microbiologically and operationally in terms of sulfide and methane production, gaining insight into the complex dynamics of key microbial groups during biofilm development. W astewater collection systems, or sewers, consist of an underground network of physical structures-installations composed of pipelines, pumping stations, manholes, and channels that convey wastewaters from their source to the discharge point, usually a wastewater treatment plant (WWTP). Sewer systems thus prevent the direct contact of urban populations to fecal material and potential microbial pathogens, greatly reducing the spread of infectious diseases. Sewers have traditionally been considered only hydraulic transport systems for sewage, although they are in fact "reactors" where complex physicochemical and microbial processes take place. Wastewater microorganisms are diverse and abundant, and they are exposed to a wide range of both inorganic and organic substrates as well as changing conditions along their transport through sewers (1). In this regard, wastewater transport through the pipes facilitates the formation of microbial biofilms that grow attached to the inner surface of sewer pipes (2). Different factors, such as large surface area, low flow velocity near pipe walls, and nutrient availability, may favor microbial colonization of pipe surfaces and biofilm growth. Formation of fully functional biofilms occurs in different steps, from surface conditioning, adhesion of microbial "colonizers," initial growth, and glycocalyx formation, followed by secondary colonization and growth (3).Anaerobic conditions in sewer pipes favor the accumulation of both sulfide (H 2 S) and methane (CH 4 ) as end products of different microbial metabolisms, i.e., anaerobic respiration of organic matter by sulfate-reducing bacteria (SRB) and methanogenic archae...

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“…The formation of CO2 and N2 can result in the formation and release of nitrous oxide gas (N2O), which significantly contributes to the greenhouse effect. [2] Ravazzini et al [3] introduced direct membrane filtration (DMF) for municipal wastewater treatment without biological treatment. In this process, raw municipal wastewater is directly applied to a membrane without any biological pre-treatment.…”

Section: Introductionmentioning

confidence: 99%