• 한국수자원학회논문집
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• 제47권12호
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• pp.1135-1143
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• 2014

본 연구에서는 사상성 조류로 구성된 수질정화시설의 수질정화효율을 평가하고자 충남 서산시 음암면에 소재한 성암저수지 유입하천 홍수부지에 test-bed를 설치하고 유입하천수를 대상으로 현장적용실험을 실시하였다. 수질항목별로 정화효율을 평가한 결과, SS 80.9%, COD 74.6%, T-N 76.8%, T-P 84.4%, DTN 93.8%, DTP 98.3%의 제거효율을 보였다. 수온에 따른 정화효율은 수온이 약 $20^{\circ}C$로 유지되어 수질정화효율에 미치는 영향은 없는 것으로 나타났다. 수리학적 체류시간(HRT)은 SS 및 TP 처리효율과 유의한 상관성이 있는 것으로 나타났고, 체류시간을 5일로 했을 때 SS, TP 처리효율이 좋은 것으로 나타났다. 유입수의 COD/TN에 따른 처리효율은 TN, TP 모두 C/N비가 낮을수록 증가하였고, 유입수의 COD/TP에 따른 처리효율도 C/P비가 낮을수록 TN, TP 모두 처리효율이 증가하는 것으로 나타났다.

• 한국양식학회지
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• 제15권1호
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• pp.49-60
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• 2002

Research on practices for improving water quality in channel catfish Ictalurus punctatus ponds was conducted at the Auburn University Fisheries Research Station, Auburn, Alabama, in 1998 and 1999. The objective of this two-year study was to determine better management practices to enhance water quality and improve production efficiency. In the first year, oxidation of bottom soil by drying, tilling, and applying sodium nitrate was performed (dry-till and dry-till with sodium nitrate treatments). The second year, based on the results obtained during the first year, precipitation of phosphorus (P) from water by applying gypsum was compared to the dry-till treatment (dry-till and dry-till with gypsum treatments). Control ponds were not subjected to bottom drying, tilling, sodium nitrate, or gypsum treatment. Channel catfish fingerings were stocked at 15,000/ha. In the first year, water in ponds from dry-till and dry-till with sodium nitrate treatments had lower concentrations (P < 0.01) of soluble reactive P, nitrate ($NO_{3} ^{-}) and nitrite ($NO_{2} ^{-}) nitrogen (N), total ammonia ($NH_3$) nitrogen, total suspended solids and turbidity, and higher values of pH, Secchi disk visibility, total alkalinity, total hardness, and calcium ($Ca^{2+}) hardness than water in control ponds. Ponds of the dry-till treatment also had lower concentrations (P < 0.01) of total P and total N than control ponds. Total fish production and survival rate did not differ among the treatments (P > 0.05). The findings suggested that drying and tiling pond bosoms between crops could achieve water quality improvement. Applying sodium nitrate to dry, tilled pond bosoms did not provide water quality improvement. In the second year, the treatment with the best results from the first year, dry-till, was compared with a dry-till with gypsum treatment. Enough gypsum was applied to give a total hardness of about 200 mg/L, and gypsum was reapplied as needed to maintain the hardness. Compared to the control, dry-till and dry-till with gypsum treatments had lower concentrations (P < 0.01) of total and soluble reactive P, total N, and total $NH_3$-N, and higher concentrations (P < 0.01) of dissolved oxygen. Ponds of the duty-till with gypsum treatment also had lower concentrations (P < 0.01) of chlorophyll $\alpha$, chemical oxygen demand, and total alkalinity than the control. Total fish production and survival rate did not differ (P > 0.05) among the treatments. These findings suggest that drying and tilling pond bosoms between crops and treating low hardness waters with gypsum could achieve water Quality improvement.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2003년도 Proceedings of the international symposium on the fusion technology
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• pp.504-510
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• 2003

This study has been carried out to evaluate the passive treatment systems for acid mine drainage in Korea and to suggest, if possible, the method for the improvement. 35 passive treatment systems in 27 mines have been constructed since 1996. SAPS, being the main process, was combined with more than one of processes such as anaerobic wetland, aerobic wetland, and oxidation pond for the construction of passive treatment system. Problems observed during the operation include the poor sulfate removal ratio, overflow, leakage, unusabless of the whole system, and inefficiency. The reasons of the poor sulfate removal ratio are believed that the low temperature during the winter prohibits the SRB activity and HRT for bacterial sulfate reduction is insufficient. An alternative method In Adit Sulfate Reducing System which enables to keep the temperature constant at about $15^{\circ}C$ was suggested. IASRS is the methods of placing the SAPS inside the adit, which enables the temperature around the system constant can be maintained. The experiments using the laboratory scaled model systems made up of four sections showed high efficiencies in pH control and metal removal ratios, but showed still low sulfate removal ratio of about $23\%$ also with high COD at the beginning of the operation.

• 상하수도학회지
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• 제21권6호
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• pp.727-735
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• 2007

The use of water by cities is increasing owing to industrialization, the concentration of population, and the enhancement of the standard of living. Accordingly, the amount of waste water is also increasing, and the degree of pollution of the water system is rising. In order to solve this problem, it is necessary to remove organisms and suspended particles as well as the products of eutrophication such as nitrates and phosphates. This study developed a high-end treatment engineering solution with maximum efficiency and lower costs by researching and developing a advanced treatment engineering solution with the use of Biosorption. As a result, the study conducted a test with a $50m^3/day$ Pilot Scale Plant by developing treatment engineering so that only the secondary treatment satisfies the standard of water quality and which provided optimal treatment efficiency along with convenient maintenance and management. The removal of organisms, which has to be pursued first for realizing nitrification during the test period, was made in such a way that there would be no oxidation by microorganisms in the reactor while preparing oxygen as an inhibitor for the growth of microorganism in the course of moving toward the primary settling pond. The study introduced microorganisms in the endogeneous respiration stage to perform adhesion, absorption, and filtering by bringing them into contact with the inflowing water with the use of a sludge returning from the secondary settling pond. Also a test was conducted to determine how effective the microorganisms are as an inner source of carbon. The HRT(Hydraulic Retention Time) in the nitrification tank (aerobic tank) could be reduced to two hours or below, and the stable treatment efficiency of the process using the organisms absorbed in the NAR reactor as a source of carbon could be proven. Also, given that the anaerobic condition of the pre-treatment tank becomes basic in the area of phosphate discharge, it was found that there was excellent efficiency for the removal of phosphate when the pre-treatment tank induced the discharge of phosphate and the polishing reactor induced the uptake of phosphate. The removal efficiency was shown to be about 94.4% for $BOD_5$. 90.7% for $COD_{Cr}$ 84.3% for $COD_{Mn}$, 96.0% for SS, 77.3% for TN, and 96.0% for TP.

• 자원환경지질
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• 제37권1호
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• pp.107-111
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• 2004

본 고에서는 우리나라 폐 석탄광 광산배수의 자연정화처리시설현황과 향후 광산배수 수질개선을 위한 기술수요를 전망하였다. 우리나라 폐 석탄광에서는 현재 약 8만톤의 갱내수가 유출되고 있으며 약 50톤/일 이상 갱내수에 대해서 자연정화시설을 설치하여 갱내수 수질개선사업을 추진하고 있다. 13개 광산에 설치된 자연정화시설의 현장수질분석 및 설계내용을 검토한 결과 SAPS 공정이 Fe의 재용출 현상이 없고 성능면에서 편차가 적어 광산배수의 중화 및 금속 정화에 핵심 공정으로 파악되었다. SAPS 의 정화성능 및 수명에 미치는 물리적 영향은 슬러지 누적에 의한 투수 계수 감소와 체류시간 등이었다. 향후 자연정화시설의 성능을 지속시킬 수 있는 기술개발과 오염부하가 큰 갱내수 처리기술과 채굴적 현장 수질개선 연구가 필요할 것으로 판단된다.