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Effect of Air-flow on Enhanced Nutrient Removal and Simultaneous Nitrification/Denitrification in DMR Biofilm Process  

Kim, Il-Kyu (Department of Civil & Environ. Engineering, Kongju National University)
Lee, Sang-Min (Department of Environ. Engineering, Kongju National University)
Lim, Kyeong-Ho (Department of Civil & Environ. Engineering, Kongju National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.30, no.10, 2008 , pp. 992-998 More about this Journal
Abstract
Recently, a new concept for nitrogen removal that is simultaneous nitrification and denitrification(SND) has been studied for wastewater treatment process. The DMR(Daiho Microbic Revolution) process that used in this study consists of two suspended anoxic, anaerobic reactors and an aerobic biofilm reactor. The function of aerobic environment and the intensity of air flow rate(2.0, 1.0, 0.5, 0.4, 0.2 L/min) were studied in the biofilm reactor; also SND and nutrient removal efficiencies were investigated. Experimental results indicated that the change in air flow did not affect COD$_{Cr}$ removal significantly. Thus sustained at 93%. The lower the air flow rate, the higher T-N removal efficiency was attained(i.e.80% at 0.2 L/min). SND efficiency was 62, 65, 72 and 78% corresponding to each air flow rate. T-P removal was sensitive to aeration intensity and removal enhanced from 75% to 96% when the air flow rate was changed from 2.0 to 0.5 L/m; however second release occured in the clarifier at 0.2 L/min. Phosphorus content of activated sludge was 5.0%, as P releases and acetate uptake a ratio of 0.75 mg P/ mg HAc.
Keywords
Air-flow; Biofilm Process; DO; SND; Poly-P Content;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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