Abstract
The flocculation of kaolinite colloidal particles was carried out at pH = 6 in suspension of initial turbidity varying between 24 NTU and 102 NTU by a casein extracted from Cocos nucifera cream. During Jar-test essays, 90% to 99% of colloids were eliminated in the sediments. The optimal doses of casein used depend on the initial colloids concentrations of the suspension and were found to be 60 mg/L and 100 mg/L respectively for suspensions having turbidity of 24 NTU and 102 NTU. The corresponding residual turbidity are respectively 2.80 NTU and 10.22 NTU for clarified water. The structural analysis of the freeze-dried sediments by FTIR shows sharp adsorption bands at 1558 cm–1 and 1653 cm–1, indicating the presence of casein in the sediment. The flocculation process between the particles of kaolinite and the coconut casein is adsorption and bridging.
Highlights
The removal of colloidal matter from water requires the use of inorganic coagulants, synthetic organic polymers or natural macromolecules
The flocculation of kaolinite colloidal particles was carried out at pH = 6 in suspension of initial turbidity varying between 24 NTU and 102 NTU by a casein extracted from Cocos nucifera cream
The aim of the present study is to suggest a technology of water treatment for the destabilization and the flocculation of kaolinite suspensions using coconut cream casein
Summary
The removal of colloidal matter from water requires the use of inorganic coagulants, synthetic organic polymers or natural macromolecules. Alum is the most widely used coagulant for water treatment because of its proven performance, its effectiveness and its easy handling. Sludges produced during the water treatment with mineral salt are very abundant and not biodegradable. The presence of this mud is a risk for the environment [1]. Synthetic organic coagulants have the disadvantages of high price and toxicity, so their use in the production process of drinking water is limited [4]
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