| Abstract |
| Heat treatment method was examined to enhance the phosphorus adsorption by alum residual produced from water purification plant. The heat treatment changes in the complex reaction between alum residual and 0H ion in solution, resulting in decrease of PH. This change was related to extraction of TOC, sulfate and chloride from alum residual. Also, the amount of TOC, sulfate and chloride from alum residual extraction dissolution was maximum at 400tm As increase the temperature from 25t (air dry) to 600t, the adsorption capacity of T-P(total phosphorus) increase from 5.15 mg T-P/g sludge to 7.12 mg T-P/g sludge. However, the maximum T-P adsorption was obtained at 400t. And, with more extraction of anions as sulfate and chloride, there is increased adsorption of T-P. It is supposed that heat treatment changes the physicochemical properties of alum residual. Futhermore, the results indicated that too higher temperature is not desirable for improving adsorption of T-P. |
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| Key Words |
| Alum residual, heat treatment, total phosphorus, sulfate, chloride |
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