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도시하천에서 하수처리수의 유지용수 이용에 따른 영향 평가 연구
방천희,박재로,권혁,Bang Cheon-Hee,Park Jae-Roh,Kwon hyok 한국농공학회 2005 한국농공학회논문집 Vol.47 No.5
Recently since urbanization has brought about a dried stream and a worse water quality, Anyang city discharged the third treated sewage into the upper stream of Anyancheon and Hakuicheon. As the result, Hakuicheon had the water level and velocity enough for a living thing in the water to live in but water quality was worse than it had been. Therefore in case of meeting the water level and velocity of the second grade water-quality which living things in the water can live in, the discharge and water quality to secure in-stream flow must be at least 0.350 $m^3/s$ and $BOD_5\;3.2 mg/{\iota}$ respectively. In Anyancheon the water level was increased a little higher than it had been but the velocity was almost unchanged in comparison with it before. On the other hand the water quality was a little better than it had been. Therefore in case of meeting the water level and velocity of the third grade water-quality that people can do water-friendly activity, the discharge and water quality to secure in-stream flow must be at least 0.688 $m^3/s$ and $BOD_5\;4.8 mg/{\iota}$ respectively. The water-quality prediction on the suggested eight scenarios was simulated in all satisfying the third grade water-quality.
수리부하량 변화에 따른 바이오필터의 처리효율에 관한 연구
방천희 ( Bang Cheon Hee ),김철성 ( Kim Chul Sung ),권순국 ( Kwun Soon Kuk ) 한국농공학회 1999 한국농공학회 학술대회초록집 Vol.1999 No.-
The perionnance of a small on-site waste water treatment system consisting of an anaerobic septic tank and upgraded absorbent biofilter was investigted. The anaerobic septic tank was used as a pre-treatment of the absorbent Biofitler instead of the primary clarifier. The treatment capacity of the system was examined by changing the hydraulic loadings to the Absorbent Biofilter as 2.5 m<sup>3</sup>/day, 4.5m<sup>3</sup>/day, 6.0 m<sup>3</sup>/day, respective. The effluent from the septic tank was fed into the Absorbent Biofilter. Based on the experimental results, the Quality of treated wastewater satisfied the regulation and the BOD and SS was removed down to approximately 5mg/ ℓ and Img/ ℓ, respectively.
소규모 오수처리시스템에서의 제올라이트에 의한 암모니아성 질소 제거
방천희 ( Bang Cheon Hee ),권순국 ( Kwun Soon Kuk ) 한국농공학회 2000 한국농공학회 학술대회초록집 Vol.2000 No.-
The purpose of this study is to remove the ammonia by using the ion exchange effect of natural zeolite (clinoptilolite in this system) and artificial zeolite and remove the organic material by using the Absorbent Biofilter. On the removal of ammonia, natural zeolite is the more effective than artificial zeolite But on the simultaneous removal of ammonia and phosphorus, artificial zeolite is the more effective than natural zeolite.
소규모 오수처리 시스템에서의 제올라이트에 의한 질소 제거
방천희 ( Bang Cheon Hee ),권순국 ( Kwun Soon Kuk ) 한국농공학회 2002 韓國農工學會誌 : 전원과 자원 Vol.44 No.2
Recently, absorbent biofilters, which are inexpensive and easy to manacle, have been supplied to the rural areas, but have limitations in removing the nutrients effectively. Accordingly, as an alternative plan. natural zeolites were arranged in front or at the rear of the absorbent biofilters, and their removal efficiency for nitrogen and, ultimately, their applicability to the on-site wastewater treatment system were studied. Furthermore, the same experiments were carried out on artificial zeolites, made from coal ashes at National Honam Agricultural Experiment Station, to compare natural zeolites with artificial ones. Treated wastewater through the Absorbent Biofilter showed 22.6% nitrogen removal efficiency, while 64.6% was attained when natural Zeolites were placed in front of the absorbent biofilters (Zeolite-Aerobic process). As an addition, phosphorus was also efficiently removed. On the other hand, Aerobic-Zeolite process, which arranged natural zeolites at the rear of the biofilters, did not have significantly higher nitrogen removal as compared to the treatment using only the absorbent biofilters. Furthermore, upon regeneration of the natural zeolite, the ion exchange rate was fecund to increase over 10% as compared to before regeneration. Our results show that natural zeolites, applied to the on-site wastewater treatment system through the Zeolite-Aerobic process, not only increase the removal efficiency of nutrients, but, by choosing the appropriate regeneration time, can also be cast-effective. Artificial zeolites, on the other hand, though more efficient in removing nutrients, cannot be regenerated and, therefore, are not cost-effective.