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Spatially explicit river catchment modelling of decamethylcyclopentasiloxane

Price, Oliver R.; Williams, Richard J.; Zhang, Zhong; van Egmond, Roger. 2009 Spatially explicit river catchment modelling of decamethylcyclopentasiloxane. [Poster] In: SETAC Europe 19th Annual Meeting. Protecting ecosystem health: facing the challenge of a globally changing environment, Gothenburg, Sweden, 31 May - 4 June 2009. Brussels, Society of Environmental Toxicology and Chemistry.

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Abstract/Summary

Decamethylcyclopentasiloxane (D5) belongs to a group of chemicals known as cyclic volatile methylsiloxanes (cVMS). D5 is used in a variety of applications including personal care and household care products. EUSES has been used to estimate concentrations of D5 in effluent and river water immediately downstream of a Sewage Treatment Plant (STP), assuming a per capita chemical consumption (PCC) of 11.6 mg/cap/day and STP removal efficiency of 95.3% (based on SimpleTreat). Two surface water monitoring campaigns have been conducted on the rivers Nene and Great Ouse in the Anglian region of the UK on two different occasions. The surface water catchment model LF2000-WQX was used to estimate D5 concentrations in the river Nene and Great Ouse. LF2000 allows natural flow estimates to be derived for any river reach in the UK and for the impact of artificial influences on the flow regime to be modelled. LF2000-WQX (water quality extension version) incorporates the ‘Mode 0’ functionality of the GREAT-ER 1 simulator. The results of a sensitivity analysis indicate that the assumed environmental load and/or the removal rate of D5 in STP are incorrect and lead to modelled concentrations that significantly over-estimate the observed concentrations of D5 in surface water. Monitored concentrations were better estimated through the use of measured effluent concentrations, but additional samples (effluent and surface water) are needed to refine the assessment. Large variation in D5 exposure concentrations were observed in the river Nene, with higher concentrations associated with summer monitoring results. The effect of seasonal variations in effluent dilution will be explored in an attempt to explain the effect of temporal variation on observed concentrations in the two UK rivers.

Item Type: Publication - Conference Item (Poster)
Programmes: CEH Programmes pre-2009 publications > Water > WA03 Developing strategic data and knowledge at a catchment scale to enable the wiser management of the water environment > WA03.3 Catchment scale modelling and assessment
CEH Sections: Boorman
Additional Keywords: catchments, exposure modelling, surface water
NORA Subject Terms: Ecology and Environment
Hydrology
Related URLs:
Date made live: 07 Sep 2009 12:08
URI: http://nora.nerc.ac.uk/id/eprint/7843

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