| Pretreatment of biodiesel waste water by chemical coagulation method |
| Paper ID : 1099-NICAME1402 |
| Authors: |
|
Ali Zenouzi *1, Aryan Alikhani2, Ali Reza Golamzadeh2 1Mechanics of biosystem - Iranian research organization for science and technology- Tehran- Iran 2Department of Agricultural Machinery Engineering, University of Tehran, Karaj, Iran |
| Abstract: |
| Biodiesel waste water treatment is one of the important challenges of biodiesel producers in industrial scale. In this study, the effects of pH, dose and mixing rate of chemical coagulation using alum were investigated. First, the effect of pH on coagulation performance was evaluated. The results showed that the pH of the solution can have a significant effect on coagulation performance. According to the results, the appropriate pH for coagulation with alum as a coagulant is 7. The effect of alum amount on coagulation was also investigated. The results showed that as the amount of alum increases, coagulation improves. With increasing dose, the number of coagulant particles increases and the color and turbidity of the water decrease. However, with excessive dose of alum, there is a high probability of forming too much coagulant which can lead to technical and economic issues. Therefore, an amount of 3 mg/L was selected as the desirable coagulant dosage. Finally, the effect of mixing rate on coagulation process was investigated. The results showed that mixing rate also has a direct effect on coagulation performance which its high amount leads to formation of finer and relatively less clotted particles while its low amount leads to formation of coarser particles but in less amount. Therefore, a mixing rate of 200 rpm was obtained as desirable. |
| Keywords: |
| biodiesel wastewater treatment, chemical coagulation, alum coagulant, flocculation |
| Status : Paper Accepted (Oral Presentation) |
