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Membrane Water Treatment Volume 9, Number 6, November 2018 , pages 447-454 DOI: https://doi.org/10.12989/mwt.2018.9.6.447 |
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Flotation of cyanobacterial particles without chemical coagulant under auto-flocculation |
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Dong-Heui Kwak, Tae-Geum Kim and Mi-Sug Kim
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| Abstract | ||
| Although flotation techniques are often used for the removal of algal particles, the practicality of algae-harvesting technologies is limited owing to the complex and expensive facilities and equipment required for chemical coagulation. Here, we examined the feasibility of an approach to separating algal particles from water bodies without the need for chemical coagulants, depending on the condition of the algae, and to determine the optimal conditions. Using Anabaena sp., a cyanobacterium causes algal blooms in lakes, we stimulated auto-flocculation in algal particles without coagulants and conducted solid-liquid separation experiments of algal particles under various conditions. The six cultivation columns included in our analysis comprised four factors: Water temperature, light intensity, nutrients, and carbon source; auto-flocculation was induced under all treatments, with the exception of the treatment involving no limits to all factors, and algal particles were wellsettled under all conditions for which auto-flocculation occurred. Meanwhile, flotation removal of auto-flocculated algal particles was attained only when nutrients were blocked after algae were grown in an optimal medium. However, no significant differences were detected between the functional groups of the extracellular polymeric substances (EPSs) of floated and settled algal particles in the FT-IR peak, which can cause attachment by collision with micro-bubbles. | ||
| Key Words | ||
| algal bloom; auto-flocculation; bubble; coagulation; cyanobacteria; flotation | ||
| Address | ||
| Dong-Heui Kwak, Tae-Geum Kim: Jeongeup Industry-Academic Cooperation Support Center, Chonbuk National University, 9 Cheomdan Rd, Jeongeup, Jeonbuk 56212, Republic of Korea Mi-Sug Kim: Dept. of Env. Eng. of Mokpo National University, 61 dorim-ri, 1666 Youngsan-ro, Cheonggye-myeon, Muan-gun, jeonnam, 58554, Republic of Korea | ||
