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http://dx.doi.org/10.5322/JES.2009.18.3.289

The Removal of Algae by Pre-oxidation  

Son, Hee-Jong (Water Quality Institute, Waterauthority)
Jung, Chul-Woo (Ulsan Regional Innovation Agency, Uisan Industry Promotion Techno Park)
Bae, Sang-Dae (Department of Environmental Engineering, Silla University)
Choi, Young-Ik (Department of Environmental Engineering, Silla University)
Kang, Lim-Seok (Department of Environmental Engineering, Pukyung National University)
Publication Information
Journal of Environmental Science International / v.18, no.3, 2009 , pp. 289-298 More about this Journal
Abstract
The blue-green algae which caused odor problem in the tap water are difficult to precipitate in sedimentation basin and clogged the filter void rapidly. The studies of this paper were not only oxidation, coagulation and sedimentation processes for effectively removing blue-green algae but yellow clay and polyamine for verification as coagulants aids. The results of this research are summarized as follows: Higher ozone dose(C) and longer contact time(T) were needed for a high degree of removing blue-green algae efficiency. the removal rate of blue-green algae was proportional to the $C\times T$ value. The removal percent of chlorophyll-a by sedimentation and filter without pre-ozonation was about 75% but 1 mg/L pre-ozonation could increase the removal percent of chlorophyll-a to 99% and more pre-ozonation could remove completely. Though the removal efficiency of turbidity could increased by high dose of chlorination, the dissolved organic carbon was increased. More chlorine dose from 4 to 10 mg/L dissolved organic carbon was decreased. Using yellow clay as coagulant aids increased density of floc so the settling velocity of floc become rising but polyamine could not increase settling velocity of floc though it could formated large floc.
Keywords
Algae removal; Microcystis sp.; Pre-oxidation; Microcystin; Coagulation; Filtration;
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