Hardness Removal from Water by Modified Starch

Patcharin Racho; Kusuma Namseethan

doi:10.4028/www.scientific.net/MSF.890.159

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HomeMaterials Science ForumMaterials Science Forum Vol. 890Hardness Removal from Water by Modified Starch

Hardness Removal from Water by Modified Starch

Abstract:

This is a preliminary study for hardness removal via modified starch combined with an ultrafiltration process that provides on high effluence quality and low cost, footprint and environmental impact treatment. This studied on potential of chemisorption process using modified starch as absorbents for hardness removal. Four modified tapioca starches were selected for evaluation that includes of oxidize starch, di-starch phosphate, hydroxyphophyl starch and phosphate monoester as well as non-modified tapioca starch too. Phosphate monoester starch achieved the highest efficiency about 98.2% of hardness removal within the adsorption capacity about 18 mg-hardness removed/g-starch. The modified starch had capable to reduced total hardness from 350.5 mg/L as CaCO₃ to 6.3 mg/L as CaCO₃ from water. However, the modified starch is an organic matter its can be contaminates in water. Then, a coagulation-flocculation processes were applied for starch colloidal destabilization and flocs by aluminum chloride (PAC) and cationic polymer for starch separation. After that process, turbidity was less than 1 NTU in the effluents. However, the total dissolved solids were increased that may be cause of some starch was solutes. These should be having a future treatment for particulate removal and cutoff the soluble starch in water likes an ultrafiltration process.

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Periodical:

Materials Science Forum (Volume 890)

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159-162

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.890.159

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Online since:

March 2017

Authors:

Patcharin Racho*, Kusuma Namseethan

Keywords:

Chemisorption, Hardness Removal, Modified Starch, Phosphate Monoester

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