Declines in phosphorus concentration in the upper River Thames (UK): links to sewage effluent cleanup and extended end-member mixing analysis

The Science of the Total Environment
C NealL K Armstrong

Abstract

Phosphorus concentrations in the upper River Thames Basin (southeastern England) are described and linked to sewage effluent sources. Weekly surveys between 1997 and 2007 of the Thames and two of its major tributaries, the Thame and the Kennet indicated that phosphorus was mainly in soluble reactive (SRP) form. Baseflow concentrations in the Thames reduced from 1584microg/l in 1998 to 376microg/l in 2006 and from 2655 to 715microg/l for the Thame. Flow response, flux and endmember mixing analysis indicated that these declines resulted from SRP reductions in sewage treatment works (STW) effluent following phosphorus stripping for the major STWs in the region. This was confirmed by comparing our analysis with direct measurements of SRP in the effluents based on Environment Agency data. A within-river loss under baseflow of approximately 64% (range 56-78%) of the SRP-effluent input was estimated for the Thames, with a near balance for the Thame. SRP concentrations in the Kennet were an order of magnitude lower than the Thames/Thame: non-point sources dominated and were important for all the rivers at high flows. It was concluded that removal of SRP from effluents would be insufficient SRP in the Thames and Thame to meet annual ave...Continue Reading

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Feb 11, 2014·Environmental Science. Processes & Impacts·Daniel S ReadAndrew S Whiteley
Mar 10, 2012·The Science of the Total Environment·Richard J Williams, David B Boorman
Nov 15, 2011·The Science of the Total Environment·August Andersson
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Aug 23, 2017·Environmental Monitoring and Assessment·L CrockfordP Jordan
Jun 3, 2021·International Journal of Environmental Research and Public Health·Anabela R ReisFernando A L Pacheco

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