Wastewater

Johnstone, David; Nowicki, Saskia; Narayan, Abishek Sankara; Sinha, Ranu

doi:10.1002/9781119520627.ch16

Cited by 1 publication

(1 citation statement)

References 11 publications

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“…In many cities, such as London, there is also an old infrastructure system with misconnected sewers and urban sources of pollution from dense housing, road runoff and atmospheric deposition of pollutants (Bell & Paskins 2013). In urban areas served by sewerage consisting of separate 'clean' surface rainwater and 'dirty' sewer pipe systems, it is not uncommon for misconnections to be made either accidentally or deliberately, whereby the sewerage effluent discharge is connected to the 'clean' water drainage (Ellis & Butler 2015;Johnstone et al 2019) and discharged into local streams. Other potential illicit wastewater sources to the surface water network include septic tanks, spillages, vehicle wash water and contaminated groundwater (Ellis & Butler 2015).…”

Section: Introductionmentioning

confidence: 99%

Green infrastructure and climate change impacts on the flows and water quality of urban catchments: Salmons Brook and Pymmes Brook in north-east London

Bussi

Whitehead

Nelson³

et al. 2022

Hydrology Research

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Poor water quality is a widespread issue in urban rivers and streams in London. Localised pollution can have impacts on local communities, from health issues, environmental degradation and restricted recreational use of water. The Salmons and Pymmes Brooks, located in the London Borough of Enfield, flow into the River Lee, and in this paper, the impacts of misconnected sewers, urban runoff and atmospheric pollution have been evaluated. The first step towards finding a sustainable and effective solution to these issues is to identify sources and paths of pollutants and to understand their cycle through catchments and rivers. The INCA water quality model has been applied to the Salmons and Pymmes urban catchments in north-east London, with the aim of providing local communities and community action groups such as Thames21 with a tool they can use to assess the water quality issue. INCA is a process-based, dynamic flow and quality model, and so it can account for daily changes in temperature, flow, water velocity and residence time that all affect reaction kinetics and hence chemical flux. As INCA is process-based, a set of mitigation strategies have been evaluated including constructed wetland across the catchment to assess pollution control. The constructed wetlands can make a significant difference reducing sediment transport and improving nutrient control for nitrogen and phosphorus. The results of this paper show that a substantial reduction in nitrate, ammonium and phosphorus concentrations can be achieved if a proper catchment-scale wetland implementation strategy is put in place. Furthermore, the paper shows how the nutrient reduction efficiency of the wetlands should not be affected by climate change.

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