| 英文摘要 |
The dye industry generates huge amount of wastewater and could severely jeopardize environmental quality. This study aimed to purify methylene blue from dye wastewater via progressive freeze concentration (PFC). PFC was introduced as a new approach to purify methylene blue. In this work, PFC technique studied for its effectiveness in removing methylene blue from wastewater of dye industry. In PFC, pure water is produced in the form of ice crystal block and leave behind a higher concentration solution. The effect of coolant temperature, operation time and stirring speed were investigated and evaluated by the value of effective partition constant (K) and percentage of solute reduction. The lowest K value (0.26) was obtained at -8°C with the highest solute reduction (71.55%). Meanwhile, the highest efficiency for stirring speed was determined at 350 rpm with K value and solute reduction were 0.33 and 62.69%, respectively. K value of 0.053 and solute reduction of 93.25% were obtained at the best time of 20 minutes. The results demonstrated that the moderate coolant temperature, moderate operation time and maximum stirring speed resulted in the lowest K value and highest percentage of solute reduction in ice which indicates the highest efficiency of methylene blue removal. |
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