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http://dx.doi.org/10.13087/kosert.2018.21.5.17

A Study on Pilot Scale Cyclonic-DAF Reactor for Cyanobacteria Removal  

Oh, Hong-Sok (Department of Environmental Engineering, Kwangwoon University)
Kang, Seon-Hong (Department of Environmental Engineering, Kwangwoon University)
Nam, Sook-Hyun (Korea Institute of Civil Engineering and Building Technology)
Kim, Eu-Ju (Korea Institute of Civil Engineering and Building Technology)
Koo, Jae-Wuk (Korea Institute of Civil Engineering and Building Technology)
Hwang, Tae-Mun (Korea Institute of Civil Engineering and Building Technology)
Publication Information
Journal of the Korean Society of Environmental Restoration Technology / v.21, no.5, 2018 , pp. 17-28 More about this Journal
Abstract
Cyclonic-dissolved air flotation(Cyclonic-DAF), an advanced form of pressure flotation, applies a structure that enables the forming of twirling flows. This in turn allows for suspended matter to adhere to microbubbles and float to the surface of a treatment tank during the process of intake water flowing through a float separation tank. This study conducted a lab-scale test and pursued geometrical modeling using computational fluid dynamics(CFD) to establish a pilot scale design. Based on the design parameters found through the above process, a pilot cyclonic-DAF system($10m^3/hr$) for removing algae was created. Upon developing the pilot-scale cyclonic-DAF system, a type of algae coagulant(R-119) was applied as the coagulant to the system for field testing through which the removal rates of chlorophyll-a and cyanobacteria were evaluated. The chlorophyll-a and harmful cyanobacteria of the raw water at region B, the field-test site, were found to be $177.9mg/m^3$ and 652,500cells/mL respectively. Treated waters applied with 60mg/L and 100mg/L of algae coagulant presented removal efficiencies of approximately 95% and 97%, respectively. The cyanobacteria cell number of the treated waters applied with 60mg/L and 100mg/L of algae coagulant both that were equal to or less than 1,000cells/mL and were below attention level criteria for the issuance of algae boundary.
Keywords
Algae; Algae removal; Cyclonic-DAF; Cyanobacteria; Coagulant;
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