| Title |
Effect of Organic Acids Fermented from the Settled Sludge and Animal Organic Wastes on the Denitrification |
| Authors |
원성연 ( Seung Yeon Weon ) ; 박승국 ( Seung Kook Park ) ; 민경국 ( Kyung Kook Min ) ; 정근욱 ( Keun Yook Chung ) ; 전병희 ( Byong Hee Jun ) ; 이상일 ( Sang Ill Lee ) |
| Keywords |
Fermentation; Total volatile acids; Primary settled sludge of domestic wastewater; External carbon source; Denitrification |
| 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 ㎎/L, respectively. The pH of organic wastes was decreased from neutral to 5.7. The ratio of TVA to NH₄^+-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 (4.2 ㎎ NO₃-N/g vss·hr) in the acclimated activated sludge. Denitrification rate was 1.5 ㎎ NO₃-N/gvss·hr in the nonacclimated sludge with the fermented acids from the primary settled sludge of domestic wastewater added. |