Abstract
A study was conducted to investigate coagulation efficiency of the plant Dicerocaryum eriocarpum (DE) in the removal of turbidity from raw water. Widespread poor land use practices contribute to high turbidity in river water, making turbidity management or removal critical, particularly before the water is used for drinking or subjected to chemical treatment. In this study, mucilage from DE was extracted with deionized water and different chloride solutions. A coagulation efficiency of 99% using modified mucilage coagulant was achieved. The modified mucilage of potassium crude extract and sodium crude extract displayed higher coagulation efficiencies than unmodified mucilage of deionized water crude extract. An increase in coagulant dosage and initial turbidity influenced the coagulation efficiency of DE coagulant. A large reduction in turbidity levels of the treated water samples resulted in an improvement in water quality. Keywords : coagulation, Dicerocaryum eriocarpum plant, mucilage, optimise, turbidity
Highlights
The coagulation process is independently capable of removing soluble organic and inorganic constituents or colloidal phase impurities, including microorganisms; coagulation is of great importance in water treatment
SCE and PCE coagulants showed the best performance in terms of turbidity removal (Fig. 1)
This study confirms that sedimentation alone without coagulation can only remove large coarse suspended solids, as previously reported by Ndabigengesere et al (1995)
Summary
The coagulation process is independently capable of removing soluble organic and inorganic constituents or colloidal phase impurities, including microorganisms; coagulation is of great importance in water treatment. Natural plant coagulants are promising materials for drinking water and wastewater treatment because they offer similar functions to inorganic coagulants and are able to satisfy the guidelines for drinking water standards (Yin, 2010). Turbidity removal reported for a number of identified natural plant coagulants has been impressive in purification of both raw and prepared turbid water. In each of the above studies, natural plant coagulants showed high performance efficiency in turbidity removal. Pritchard et al (2010) and Abaliwailo et al (2008) demonstrated the potential of natural plant coagulants to reduce the number of microorganisms (coliforms) in water via their anti-microbial properties. The potential of a natural plant to act as a coagulant seems to be associated with their polyelectrolytes and biochemical properties (Yin, 2010)
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