Municipal wastewater treatment with pond technology: Historical review and future outlook

Ho, Long; Goethals, Peter

doi:10.1016/j.ecoleng.2020.105791

Cited by 53 publications

(24 citation statements)

References 179 publications

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“…Moreover, a low amount of oxygen causes the emissions of N2O during denitrification as N2O reductase is more sensitive to be inhibited by oxygen compared to nitrite reductase and nitric oxide reductase (Kampschreur et al, 2009;Schreiber et al, 2012). Additionally, an extra pathway of N2O emissions from the metabolism of green algae, which may be affected by nitrite concentration and photosynthesis repression, are not yet fully understood (Ho and Goethals, 2020b).…”

Section: Main Important Variable On the Variation Of The Ghg Emissionsmentioning

confidence: 99%

Effects of land use and water quality on greenhouse gas emissions from an urban river system

Jerves-Cobo

Barthel

et al. 2020

Preprint

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Abstract. Rivers act as a natural source of greenhouse gases (GHGs) that can be released from the metabolisms of aquatic organisms. Anthropogenic activities can largely alter the chemical composition and microbial communities of rivers, consequently affecting their GHG emissions. To investigate these impacts, we assessed the emissions of CO2, CH4, and N2O from Cuenca urban river system (Ecuador). High variation of the emissions was found among river tributaries that mainly depended on water quality and neighboring landscapes. By using Prati and Oregon Indexes, a clear pattern was observed between water quality and GHG emissions in which the more polluted the sites were, the higher were their emissions. When river water quality deteriorated from acceptable to very heavily polluted, their global warming potential (GWP) increased by ten times. Compared to the average estimated emissions from global streams, rivers with polluted water released almost double the estimated GWP while the proportion increased to ten times for very heavily polluted rivers. Conversely, the GWP of good-water-quality rivers was half of the estimated GWP. Furthermore, surrounding land-use types, i.e. urban, roads, and agriculture, significantly affected the river emissions. The GWP of the sites close to urban areas was four time higher than the GWP of the nature sites while this proportion for the sites close to roads or agricultural areas was triple and double, respectively. Lastly, by applying random forests, we identified dissolved oxygen, ammonium, and flow characteristics as the main important factors to the emissions. Conversely, low impact of organic matter and nitrate concentration suggested a higher role of nitrification than denitrification in producing N2O. These results highlighted the impacts of land-use types on the river emissions via water contamination by sewage discharges and surface runoff. Hence, to estimate of the emissions from global streams, both their quantity and water quality should be included.

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Section: Main Important Variable On the Variation Of The Ghg Emissionsmentioning

confidence: 99%

Effects of land use and water quality on greenhouse gas emissions from an urban river system

Jerves-Cobo

Barthel

et al. 2020

Preprint

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“…In the US, more than half of wastewater treatment plants (WWTPs) are WSPs (ca. 8000 facilities) which are also the first choice for nearly all remote communities in northern Canada [14]. Similarly, in Europe, WSPs account for 20% of the total number of WWTPs in France and 33% of the WWTPs in Germany [15].…”

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confidence: 99%

Sustainability of Lakes and Reservoirs: Multiple Perspectives Based on Ecosystem Services

Goethals

2021

Water

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“…The disinfection effect may be due to pond environmental factors (temperature, DO, pH, etc. ), microbial completion and/or antagonism and solar irradiation although the underlying mechanisms remain unknown (Ho and Goethals, 2020).…”

Section: Discussionmentioning

confidence: 99%

“…This was different from 2011 where a reduced operational depth in the pond, yielding a lower OLR (kg/m 2 /day), and an unusual warm summer led to an algal bloom in the Pond Inlet WSP (Ragush et al, 2015). The lack of algae in the WSPs could affect the wastewater treatment as normal WSP treatment is based on growth of algae to supply oxygen to the aerobic decomposing bacteria, sequester phosphorous and disinfection due to the increased alkalinity of the water during algal blooms (Amengual-Morro et al, 2012;Ho and Goethals, 2020). The absence of algae growth may be related to the high OLRs and low temperatures in the ponds as demonstrated in model experiments (Ragush et al, 2017).…”

Section: Discussionmentioning

confidence: 99%

“…Decomposing microorganisms with a wide range of metabolisms are important for removal of CBOD 5 and other nutrients in WSP systems (Wagner et al, 2002;Ferrera and Sánchez, 2016;Ho and Goethals, 2020). Bacterial community changes along the treatment process (raw to pond, and season) led to reductions in alpha diversity and increases in Comamonadaceae, Geobacteraceae, and Porphyromonadaceae.…”

Municipal wastewater treatment with pond technology: Historical review and future outlook

Cited by 53 publications

References 179 publications

Effects of land use and water quality on greenhouse gas emissions from an urban river system

Effects of land use and water quality on greenhouse gas emissions from an urban river system

Sustainability of Lakes and Reservoirs: Multiple Perspectives Based on Ecosystem Services

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