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延動錫,李元鎬 충주대 산업과학기술연구소 2001 産業科學論文集 Vol.9 No.-
Suspended and dissolved substance were included in water. Suspended substances can be relatively easily removed by sand filter, whereas, complete removal of dissolved substances in water was not possible at present. It is due to repulsion between negative charge of dissolved substances and sand filter previously used. Potential application of sand filters coated with Al and Fe in removing humid substances was evaluated in this experiment to improve removal efficiency of the dissolved substances in the water. In the adsorption experiment, the removal efficiency of humic substances was higher in the coated sand filter than In the uncoated one. More specifically, the higher removal efficiency of the humic substances in the Al-coating sand filter was obtained over the pH range randomly determined(4.2, 5.1, 7.6, and 10.0). Especially, the removal efficiency of the humic substance at the pH 10 was relatively constantly maintained at a level of about 95% during the maximum 8 hours. After then, it was sharply decreased. In the leaching experiment, the concentration of leachate in both coated and uncoated sand filters was all the highest at pH 9.95. It was relatively higher over the pH range of 7 to 10 than other pH range. Finally, the removal efficiency of the humic substances obtained in the readsorption experiment was rapidly declined, compared to that obtained in the adsorption experiment. Experiment results acquired in this research may be used to develop a promising technology for the removal of bacteria, algae, and colorful colloids, and a variety of dissolved substances in water.
양돈폐수 처리시 질소 부하량에 다른 반응조내에서 질소와 인의 거동
李元鎬,延動錫 충주대학교 산업대학원 1999 大學院論文輯 Vol.1 No.-
Removal of nitrogen and phosphate is wastewater is concerned to be important for the prevention of eutrophication in receiving water and lakes. Conventional activated sludge system designed for organics removal can be retrofitted only by modification of aeration basin to maintain anaerobic and aerobic state. Biological nutrient removal(BNR) process such as Bardenpho, A^2/O were generally used for the treatment of wastewater. In this research,intermittently aerated activated sludge system has been investigated for the removal of nutrients in swine wastewater taken from swine farm in Chungju area. Intermittently aerated two and four-stage activated sludge systems were operated. The effect of step loading rates of nitrogen on carbon and nutrient removal efficiencies were evaluated in intermittently aerated activated sludge system. At normal operational condition,removal efficiencies of CODcr,TN and TP were 93.3, 90.9 and 97%, respectively. Corresponding TN loading rate was 0.22 Kg/㎥-day. As nitrogen loading rate was increased to 0.47 Kg/㎥-day, corresponding removal efficiencies were changed to 91.2, 68.1 and 10%, respectively. Eventhough removed total amount of organic and nitrogen was not remarkably changed, phosphorus removal mechanism was abruptly destroyed as increase of nitrogen loading rate. Also,phosphorus removal efficiency was net recovered during whole experimental periods as nitrogen loading rates was gradually decreased to normal operational condition.