| Title |
Treatment of Seafood - Processing Wastewater by Anoxic / Oxic Biofilm Process |
| Authors |
권순영 ; 유성환 ; 우영국 ( Soon Young Kwon ; Sung Whan Yo ; Young Gug Woo ) |
| Abstract |
The combined process of biofilm and suspended growth type for denitrification was used to treat seafood processing wastewater containing high organic and nitrogen compounds. The reactors were made by transparent prexiglass and consisted of the two sequent anoxic and oxic basins for nitrification and denitrification. Wastewater for experiment was supplied from collecting reservoir at industrial wastewater treatment plant twice a week. Concentration of wastewater was ranged in the TCOD of 4,000∼5,500㎎/l, TSS of 3,000∼5,000㎎/l, TKN of 500∼600㎎/l, T-P of 197∼275㎎/l and Temperature of 14℃∼29℃. In order to get stable efficiency, the experiment was operated for 180 days. During experiment the efficiency was shown stably in treating organic and nitrogen compounds. The results were as follows: 1) Most of organic materials were removed at the first anoxic reactor, but nitrogen compounds were removed at the second oxic reactor. 2) The efficiency for organic and nitrogen treatment were 93% and 86%, respectively at the organic volumetric loading rate of 0.75KgTCOD/㎥·d and nitrogen volumetric loading rate of 0.1KgTKN/㎥·d. 3) At predenitrification process, the nitrogen was removed above 90% at the loading rate of 0.3∼1.2KgN/㎥· d, but removed in the range of 20∼60% at 0.15∼0.6KgN/㎥·d at the post-denitrification process. 4) The removal efficiency in the organic volumetric loading rate of 0.75KgTCOD/㎥·d was higher than that of 0.50KgTCOD/㎥·d on the temperature of 26℃∼29℃. Consequently, the denitrification process of this study will get the satisfied effluent below the effluent limit of BOD 30㎎/l if the reactor be designed at the loading rate of 0.6KgBOD/㎥·d and HRT=3days without addition of extra-Carbon source. |