Impact of Daily and Seasonal Variation of Raw Water Quality on Treatability: a Case of Gaba Complex
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Date
2016
Journal Title
Journal ISSN
Volume Title
Publisher
Global Journal of Engineering Science and Research Management
Abstract
Conventional water treatment is constrained by factors such as variation in raw water quality, inefficient
coagulation, use of inappropriate sand for filtration, and poor backwashing process among others. The objective of
this study was to find out the impact of daily and seasonal variation of raw water quality on conventional water
treatment through the jar testing process. Short filter run times as low as 12 h were experienced at Gaba complex
requiring emergency backwashing. The short filter run times were envisaged to be resulting from the inability of the
coagulation process to cope with the varying water quality. Generally, the pH of the water samples showed no
significant (p>0.05) difference in both the dry and wet period. The water turbidity and colour were significantly
(p<0.05) higher in the dry period compared to the wet period. The optimum alum dose (60 to 70 mg L-1) for each
jar test showed up to 92% turbidity removal and complete colour removal. Variation in the raw water quality both
daily and seasonally did not significantly (p>0.05) affect the amount of coagulant required for optimal water
treatment. The short filter run times therefore, could be due to other factors to be investigated.
Description
Keywords
Coagulation, Daily, Seasonal variations, Water treatment, Water quality