Effects of electric current on electrocoagulation for optimal harvesting of microalgae for advanced wastewater treatment
| Autor: | Hwang Sun-Jin, Shan Zhang |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
biology Electrolysis of water business.industry medicine.medical_treatment Scenedesmus dimorphus Environmental engineering biology.organism_classification Pulp and paper industry Electrocoagulation Anode chemistry.chemical_compound chemistry Electrode medicine Alternative energy Hydroxide Sewage treatment business |
| Zdroj: | Journal of Korean Society of Water and Wastewater. 28:473-478 |
| ISSN: | 1225-7672 |
| Popis: | 【Microalgae is known as one alternative energy source of the fossil fuel with the small size of $5{\sim}50{\mu}m$ and negative charge. Currently, the cost of microalgae recovery process take a large part, about 20 - 30% of total operating cost. Thus, the microalgae recovery method with low cost is needed. In this study, the optimum current for Scenedesmus dimorphus recovery process using electrocoagulation techniques was investigated. Under the electrical current, Al metal in anode electrode is oxidized to oxidation state of $Al^{3+}$ . In the cathode electrode, the water electrolysis generated $OH^-$ which combine with $Al^{3+}$ to produce $Al(OH)_3$ . This hydroxide acts as a coagulant to harvest microalgae. Before applying in 1.5 L capacity electrocoagulation reactor, Scenedesmus dimorphus was cultured in 20 L cylindrical reactor to concentration of 1 OD. The microalgae recovery efficiency of electrocoagulation reactor was evaluated under different current conditions from 0.1 ~ 0.3 A. The results show that, the fastest and highest recovery efficiency were achieved at the current or 0.3 A, which the highest energy efficiency was achieved at 0.15 A.】 |
| Databáze: | OpenAIRE |
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