Use of Environment-Friendly Starch as Flocculent in Raw Water Turbidity Removal

Rashid Hameed, Mohammed Ali
May 2014
Australian Journal of Basic & Applied Sciences;May2014, Vol. 8 Issue 7, p113
Academic Journal
Background: In this study, the benefit of using the starch manufactured in Iraq and derived from corn corps as flocculent agent in the treatment of raw water for turbidity removal was investigated in jar test procedure, which was carried out on raw waters with different turbidity levels (100, 500, 1000, and 2000 NTU) and different dosages of starch (0, 0.5, 1, 1.5, 2mg/L), through three purification operations; coagulation, flocculation, and finally sedimentation. The alum available naturally in Iraq was the coagulant in this test added in different dosages (5, 10, 15, 20, 20 mg/L), four flatpaddles stirrer was driven for constant velocity gradient of (700 S-1) in coagulation process and one minute detention time in the jar containers, while different velocity gradients (20, 40 S -1) were used in flocculation process for detention time of 30 min. at temperature of 15 °C. Objective: to get final conclusions help the water treatment plant operators to select the suitable dosages of chemicals according to raw water turbidity to get the most effective solids removal at low cost and fulfill the needs of the community of drinking water supplies. Results: Samples were taken through the jar tests and the achieved results of turbidity removals were recorded and studied, which show that, starch is efficient as flocculation aid through its known as bridging effect and can play important role in reducing the dosages of coagulant used in treatment especially in high turbidity raw waters, consequently reducing Aluminum ion in water which is responsible for causing Alzheimer disease in human, in addition to cost, and decreasing generated sludge. Furthermore, the remarkable turbidity removal efficiency gained when starch used as flocculent in comparison to with the case when not used is of interest.


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