Light attenuation parameters for waste stabilisation ponds
Heaven, S., Banks, C.J. and Zotova, E.A. (2005) Light attenuation parameters for waste stabilisation ponds. Water Science and Technology, 51, (12), 143-152.
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.
|Keywords:||extinction coefficient, light attenuation, waste stabilisation ponds|
|Subjects:||T Technology > TA Engineering (General). Civil engineering (General)
Q Science > QH Natural history > QH301 Biology
|Divisions:||University Structure - Pre August 2011 > School of Civil Engineering and the Environment
|Date Deposited:||28 Jun 2006|
|Last Modified:||28 Jun 2012 10:28|
|Contributors:||Heaven, S. (Author)
Banks, C.J. (Author)
Zotova, E.A. (Author)
|Contact Email Address:||email@example.com|
|RDF:||RDF+N-Triples, RDF+N3, RDF+XML, Browse.|
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