Light attenuation parameters for waste stabilisation ponds
Light attenuation parameters for waste stabilisation ponds
Effective modelling of. shallow water ecosystems, including waste stabilisation ponds, is strongly dependent on the availability of good estimates of the light attenuation coefficient k (m(-1)). Experimental data is presented on its determination using purpose-built laboratory apparatus with a near-parallel halogen light source and an array of photodiodes allowing measurements of irradiance at different depths. The equipment was used to compare k values from different pure cultures, and mixed cultures of algae taken from a pilot-scale WSP.
Laboratory values were compared with in situ measurements in the pond. At concentrations above 50 mg 1(-1) the relationship between k and suspended solids is non-linear; k also varied with depth. This could be modelled by a single equation, suggesting similarity of response in different cultures. At shallow depths and low suspended solids concentrations k values are variable and hard to measure reliably. The results highlight the need to standardise on a method for the measurement and reporting of k values if these are to be widely applicable in the development of pond models.
extinction coefficient, light attenuation, waste stabilisation ponds
143-152
Heaven, S.
f25f74b6-97bd-4a18-b33b-a63084718571
Banks, C.J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Zotova, E.A.
00e9bede-a9f7-4390-9b3a-ec1a0b702145
1 June 2005
Heaven, S.
f25f74b6-97bd-4a18-b33b-a63084718571
Banks, C.J.
5c6c8c4b-5b25-4e37-9058-50fa8d2e926f
Zotova, E.A.
00e9bede-a9f7-4390-9b3a-ec1a0b702145
Heaven, S., Banks, C.J. and Zotova, E.A.
(2005)
Light attenuation parameters for waste stabilisation ponds.
Water Science & Technology, 51 (12), .
Abstract
Effective modelling of. shallow water ecosystems, including waste stabilisation ponds, is strongly dependent on the availability of good estimates of the light attenuation coefficient k (m(-1)). Experimental data is presented on its determination using purpose-built laboratory apparatus with a near-parallel halogen light source and an array of photodiodes allowing measurements of irradiance at different depths. The equipment was used to compare k values from different pure cultures, and mixed cultures of algae taken from a pilot-scale WSP.
Laboratory values were compared with in situ measurements in the pond. At concentrations above 50 mg 1(-1) the relationship between k and suspended solids is non-linear; k also varied with depth. This could be modelled by a single equation, suggesting similarity of response in different cultures. At shallow depths and low suspended solids concentrations k values are variable and hard to measure reliably. The results highlight the need to standardise on a method for the measurement and reporting of k values if these are to be widely applicable in the development of pond models.
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Published date: 1 June 2005
Venue - Dates:
6th IWA International Conference on Waste Stabilisation Ponds, Avignon, France, 2004-09-28 - 2004-10-01
Keywords:
extinction coefficient, light attenuation, waste stabilisation ponds
Identifiers
Local EPrints ID: 39454
URI: http://eprints.soton.ac.uk/id/eprint/39454
ISSN: 0273-1223
PURE UUID: e64b8266-0ccd-4d88-b8b7-d6e8e30ede12
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Date deposited: 28 Jun 2006
Last modified: 16 Mar 2024 02:52
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Author:
E.A. Zotova
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