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Improvement of Organics and Nitrogen Removal by HRT and Recycling Rate in Air Lift Reactors  

Kim, Jin-Ki (Department of Environmental Engineering, Graduate School, Kwangdong University)
Yu, Sung-Whan (Department of Environmental Engineering, Graduate School, Kwangdong University)
Lim, Bong-Su (Department of Environmental Engineering, Graduate School, Daejeon University)
Publication Information
Journal of Korean Society on Water Environment / v.22, no.1, 2006 , pp. 45-50 More about this Journal
Abstract
This study was performed to evaluate the air lift reactors (ALR) by variations of HRT and recycling rate. Air lift reactor was composed of bioreactor and clarifier above it. To remove organic matters and nitrogen through the formation of microbic film and filtration, bio-filter reactors were filled with clay, glass, bead, waste plastic, respectively. Influent wastewater was fed to biofilter reactor, and effluent wastewater from bio-filter reactor was injected ALR again, instead of adding external carbon source. Effluent BOD concentration was satisfied with lower than 10 mg/L in recycling rate 100% regardless of the variation of HRT and the kinds of media materials. In HRT 4 hr, recycling rate 100%, BOD removal efficiency rate was from about 85 to 90%, COD removal efficiency rate was higher than 90%. Effluent TN concentration was satisfied with less than 20 mg/L, if HRT was maintained by over than 6 hr regardless of recycling rate and media materials. Over than HRT was 4 hr, microbes concentration in air lift reactor was maintained over than 2,500 mg/L constantly, not sensitive to environmental condition, and organic removal was effective as it was higher.
Keywords
Air lift reactor; Bio-filter; Hydraulic retention time (HRT); Recycling rate;
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