Abstract
Waste water stabilization pond is a simple way of treating waste water but one of its limitations is that it requires large area of land to be efficient. This study employed the use of solar reflectors to improve the efficiency of waste water stabilization pond by investigating the effect of variation of solar reflectors on the physical, chemical and biological properties of the pond. To achieve this, three model ponds were constructed, arranged in parallel and were supplied waste water by an overhead tank. Different sizes of reflectors varying along its height and width were installed at the effluent side of the pond. Effluent samples were collected and tested for BOD, total coliform, temperature, pH, algal count, total suspended solids and dissolved oxygen. The findings showed that when the width of the reflector is longer than the height of the reflector, it was observed to favor increase in pH, decrease in total coliform and total suspended solids while reflectors with longer height than width were observed to favor increase in algal count, temperature, dissolved oxygen and decrease in BOD. Key words: Waste water stabilization pond, waste water, solar radiation, solar reflectors.  
Highlights
Waste water stabilization pond (WSP) is a basin dug on the earth for removal of organic and pathogenic organisms (Agunwamba, 2001)
Due to large area requirement of WSP, researchers has been working on this area of study to improve the efficiency of ponds using attached growth system (Shin and Polpraset, 1987; Saidam et al, 2000), step feeding (Shelef et al, 1987), water hyacinth (Mumtaz and Hashim 2012), hydraulic jump (Agunwamba and Ogarekpe, 2010), hydraulic jump and solar reflectors (Agunwamba et al 2013) and solar reflectors (Agunwamba and Utzev, 2012)
Waste stabilization pond is a simple way of treating waste water, but its limitation is that it requires large area of land to operate effectively
Summary
Waste water stabilization pond (WSP) is a basin dug on the earth for removal of organic and pathogenic organisms (Agunwamba, 2001). One of its limitations as stated by Agunwamba (2001) is that WSP system usually requires large area of land which is attributable to its complete dependence on natural treatment process. This research is aimed at enhancing the efficiency of WSP without increasing area requirement of the pond by incorporating solar reflectors. Due to large area requirement of WSP, researchers has been working on this area of study to improve the efficiency of ponds using attached growth system (Shin and Polpraset, 1987; Saidam et al, 2000), step feeding (Shelef et al, 1987), water hyacinth (Mumtaz and Hashim 2012), hydraulic jump (Agunwamba and Ogarekpe, 2010), hydraulic jump and solar reflectors (Agunwamba et al 2013) and solar reflectors (Agunwamba and Utzev, 2012). Due to large area requirement of WSP, researchers has been working on this area of study to improve the efficiency of ponds using attached growth system (Shin and Polpraset, 1987; Saidam et al, 2000), step feeding (Shelef et al, 1987), water hyacinth (Mumtaz and Hashim 2012), hydraulic jump (Agunwamba and Ogarekpe, 2010), hydraulic jump and solar reflectors (Agunwamba et al 2013) and solar reflectors (Agunwamba and Utzev, 2012). Agunwamba et al (2013) investigated if a solarenhanced WSP (SEWSP) can increase treatment
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