keywords: Turbidity, seeds, extracts, storage, clay, pot, polythene bag
The study examined the effects of shelf life and efficiency of the extracts of Moringa oleifera, Hibiscus sabdariffa and Hibiscus esculentus seeds on removal of water turbidity. Two different methods of seeds storage were investigated. One part of each seed was placed in a clay pot and covered which was labelled as “N” while the other part was placed in polythene bags of 700 gauges and placed in a clay pot and covered which was labelled as “P”. The seeds were subjected to ethanol extraction each month for six consecutive months based on soxhlet method using soxhlet solvent extractor. The coagulation activities of the seeds extracts were conducted using the jar test experiment. The extracts of the stored seeds at varying dosages of 30, 40, 50, 60, 70 and 80 mg/l were used on pond water having turbidity strengths ranging from 343-385 NTU. The results revealed that the efficiencies of turbidity removal of all the seeds extracts decreased as storage time increased. Higher values of turbidity removal were associated with storage method “P”. The shelf life of the turbidity removal was insignificant for Moringa oleifera seeds extract and significant for Hibiscus sabdariffa and Hibiscus esculentus seeds extracts. The use of polythene bag and clay pot for seeds storage among rural dwellers especially when the seeds are being considered for water treatment and storage duration of up to six months should be encouraged.
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