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Effect of Organic Acids Fermented from the Settled Sludge and Animal Organic Wastes on the Denitrification  

Weon, Seung-Yeon (Board of Audit and Inspection)
Park, Seung-Kook (Hanwha Eco Institute, Hanwha E&C Corp.)
Min, Kyung-Kook (Environmental Management Corp.)
Chung, Keun-Yook (Department of Agricultural Chemistry, Chungbuk National University)
Jun, Byong-Hee (Department of Environmental Engineering, Chungbuk National University)
Lee, Sang-Ill (Department of Environmental Engineering, Chungbuk National University)
Publication Information
Journal of Korean Society on Water Environment / v.21, no.2, 2005 , pp. 147-152 More about this Journal
Abstract
Fermentation efficiencies of organic wastes from the variety of sources were evaluated based on the production of total volatile acids(TVA) in batch reactor. Mixing and pH were not significant factors in producing TVA from the organic wastes. After a 10-day fermentation, final TVA concentrations in piggery, cattle, poultry, and primary settled sludge of domestic wastewater were 8,900, 2,900, 7,370 and 1,630 mg/L, respectively. The pH of organic wastes was decreased from neutral to 5.7. The ratio of TVA to $NH_4{^+}-N$ produced from the animal waste ranged from 11.5 to 30.1, whereas, that in the primary settled sludge of domestic wastewater, was 5.4. Possibility of fermented organic wastes as the electron donors for denitrification in the activated sludge was investigated. In both acclimated and nonacclimated activated sludge, higher denitrification rates were obtained with fermented piggery sludge added than with either methanol or acetate added. The fermented organic acids derived from the primary settled sludge gave the higher denitrification rate ($4.2mg\;NO_3-N/g\;vss{\cdot}hr$) in the acclimated activated sludge. Denitrification rate was $1.5mg\;NO_3-N/g\;vss{\cdot}hr$ in the nonacclimated sludge with the fermented acids from the primary settled sludge of domestic wastewater added.
Keywords
Fermentation; Total volatile acids; Primary settled sludge of domestic wastewater; External carbon source; Denitrification;
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