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  • 저자

    최진식

  • 학위수여기관

    경상대학교 대학원

  • 학위구분

    국내박사

  • 학과

    농공학과 농업토목공학

  • 지도교수

  • 발행년도

    2014

  • 총페이지

    xiv, 167 p.

  • 키워드

    수직-수평 흐름;

  • 언어

    kor

  • 원문 URL

    http://www.riss.kr/link?id=T13534253&outLink=K  

  • 초록

    For decades since 1960s, constructed wetlands have been heavily used worldwide for the treatment of domestic and industrial wastewater (point source pollutant) and agricultural outflow (nonpoint source pollutant). The basic biogeochemical processes in wetlands, involved in removing contaminants from wastewater, are nearly the same as those experienced in natural system. Therefore constructed wetlands have been considered environmentally sound and sustainable technology. Recently the advantages of the wetland system led to increased interests on constructed wetlands in South Korea despite the extensive site area required for their construction. Constructed wetlands which are managed to optimize water quality improvement generally consist either of horizontal and vertical flow system. While many researches are being conducted on the use of wetlands as secondary and tertiary treatment facilities for various wastewater, the pollutant removal efficiency of constructed wetlands for the primary treatment of domestic wastewater and lake water was rarely been investigated. Constructed wetlands can vary in performance depending on the materials, such as filter media and vegetation, type of wastewater, and structural design of system. Thus, for effective use of constructed wetlands system, the skills of different type of wetlands with various conditions should be carefully examined prior to the applications. This study developed a functional filter media as potential material for constructed wetlands and conducted laboratory experiments to evaluate its performance compared to conventional system using general sand and gravel filter media. Additionally a pilot-scale wetland combining vertical flow and horizontal flow system was constructed and operated for 9 months to investigate the applicability of filter media for treatment of different contaminated water sources, sewage and lake water. In this study horizontal flow constructed wetland is followed by vertical flow wetland in consecutive order. The vertical flow wetland system was designed to maintain aerobic conditions using natural air draft system and each system was filled with standardized filter media, and planted with reeds and iris pseudacorus on the surface of wetlands. The result of experiments showed that functional filter media successfully removed COD, T-N, and T-P of sewage inflow by 95.6%, 75.2% and 81.2%, respectively. This results indicate greater removal efficiencies comparing to conventional system by 7.3%, 26.4% and 17.2%, respectively. Similarly removal efficiencies for lake water were improved by 50.1%, 66.1% and 54.2%, respectively. Additionally Chl-a of lake water was treated with the removal efficiency of 89.0%. In a pilot-scale experiment, the results showed that vertical flow and horizontal flow constructed wetland has significant skills in increasing DO concentration approximately by 71.4% and improving BOD, COD, SS, T-N, and T-P of sewage inflow by 97.5%, 95.6%, 98.9%, 69.0%, and 77.3%, respectively. For lake water, the system showed considerable removal efficiencies for COD, SS, T-N, and T-P by 59.4%, 63.2%, 55.0%, and 64.7%, respectively. Additionally the role of vegetation in removing nutrients by uptake was quantitatively evaluated. The results showed that reeds contribute to the removal of T-N and T-P by 5.4% and 1.6% when planted in vertical flow constructed and iris pseudacorus contribute 3.7% and 8.4%, respectively. Overall, this study demonstrated that constructed wetlands combining vertical flow and horizontal flow system employing functional filter media and appropriate vegetation have significant efficiency as the primary treatment for improving water quality of both sewage and lake water. The limitations and requirements for sustainable operation of the wetland system should be further investigated as a future work. The advantages and performance of constructed wetlands will vary according to the cases, depending on characteristics of inflow sources, structural design, and environmental conditions. Therefore, it may be important to conduct similar quantitative experiments using alternative wetland system to determine the most appropriate technique for given conditions and applications of interest.


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