A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Development of algae removal method based on positively charged bubbles
Abstract Algae and red tides have become a global problem, yet a treatment method has yet to be discovered. In a situation where the algae are supposed to be precipitated or eliminated, a secondary treatment is necessary, owing to sediments and other toxic matter. For this reason, an algae removal process using the flotation method is being considered. The flotation method is a process that utilizes the buoyancy of microbubbles after they have attached to the algae and the red tide. Thus, using this method offers the advantage of not requiring secondary treatment. This study was conducted using four steps for finding a method to remove algae in natural water systems, and applies theoretical and experimental principles to prove them. First, bubbles and particles should be similar in size, and theoretical results show the highest efficiency of removal occurs when bubbles and particles have opposite charges. The second step relates to the characteristics of bubbles. In particular, we have found a way of measuring the charge on a bubble, and found that bubbles have a negative charge too. The third step is a technique to generate positively charged bubbles to remove algae that possess a negative charge, because it is easier to do this than to change the charge of algae. Finally, the fourth step was a lab-scale test using positively charged micro bubbles measuring 30–50 um. Positively charged bubbles seem to be the most effective for removing algae.
Development of algae removal method based on positively charged bubbles
Abstract Algae and red tides have become a global problem, yet a treatment method has yet to be discovered. In a situation where the algae are supposed to be precipitated or eliminated, a secondary treatment is necessary, owing to sediments and other toxic matter. For this reason, an algae removal process using the flotation method is being considered. The flotation method is a process that utilizes the buoyancy of microbubbles after they have attached to the algae and the red tide. Thus, using this method offers the advantage of not requiring secondary treatment. This study was conducted using four steps for finding a method to remove algae in natural water systems, and applies theoretical and experimental principles to prove them. First, bubbles and particles should be similar in size, and theoretical results show the highest efficiency of removal occurs when bubbles and particles have opposite charges. The second step relates to the characteristics of bubbles. In particular, we have found a way of measuring the charge on a bubble, and found that bubbles have a negative charge too. The third step is a technique to generate positively charged bubbles to remove algae that possess a negative charge, because it is easier to do this than to change the charge of algae. Finally, the fourth step was a lab-scale test using positively charged micro bubbles measuring 30–50 um. Positively charged bubbles seem to be the most effective for removing algae.
Development of algae removal method based on positively charged bubbles
Kim, Tschung-il (author) / Park, Hyunju (author) / Han, Mooyoung (author)
KSCE Journal of Civil Engineering ; 21 ; 2567-2572
2017-01-31
6 pages
Article (Journal)
Electronic Resource
English
Development of algae removal method based on positively charged bubbles
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