• Title, Summary, Keyword: constructed wetland

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Effects of Plant on Pollutant Removal Rate n Surface-flow Constructed Wetlands (자유수면형 인공습지에서 식물식재 유무가 처리효율에 미치는 영향)

  • Ham, Jong-Hwa;Kim, Hyung-Joong;Kim, Dong-Hwan;Hong, Dae-Byuk
    • Journal of The Korean Society of Agricultural Engineers
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    • v.53 no.6
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    • pp.85-91
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    • 2011
  • Three different types of wetlands (unplanted wetland, reed planted wetland, cattail planted wetland) were constructed at the mouth of Seokmoon reservoir with 910 $m^2$ each to examine the effects of wetland plant on pollutant removal rate in constructed wetland, and operated for 9 years (2002~2010). Water depth of the wetland was maintained at 0.3~0.5 m, flow rate was about 40~200 $m^3$/day, and retention time was managed at about 1~5 days. There was no difference in removal rate of SS, TN, and TP between reed wetland and cattail wetland. Removal rate of SS and TN in planted wetland with reed and cattail were higher than unplanted wetland, whereas removal rate of TP in unplanted wetland was higher then planted wetland. The monthly variation of removal rate in planted wetlands was high compared with unplanted wetland. From the long term monitoring results, SS and TN removal rates of period3 (2008~2010) were higher than period1 (2002~2004) in planted wetland, whereas TP removal rate was decreased as time goes on. Overall, pollutant removal rate in constructed wetland was more influenced by existence of plants than by plant species. Although constructed wetland is operated long term period, SS, TN, and TP removal rate (SS 90 %, TN 60 %, TP 40 %) can be maintained high values.

A Study on Constructed Wetland Ecological Park Design with Multiple-cell FWS Layout -focus on Structural Design of Sustainable Structured wetland Biotope(SSB) Park- (자유수면형 인공습지 환경·생태공원 설계 -생태적 수질정화비오톱 공원의 구조설계를 중심으로-)

  • Byeon, Wooil
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.9 no.5
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    • pp.1-9
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    • 2006
  • The purpose of this study is to make a design guideline in designing constructed wetland which can treat water quality both of point and nonpoint source water pollution. It focuses on structural aspects of two case studies of constructed wetland applying SSB(Sustainable Structured wetland Biotope) system in Korea. The constructed wetland of Lake Ju-am which was constructed in 2002 by Environmental Management Corporation, was designed by applying SSB system. It shows higher removal efficiency than expected - 56% of BOD removal efficiency, 60% of T-N removal, and 76% of T-P removal efficiency. In two cases, total wetland areal extents were calculated referred to treatment efficiency. The system is consist of micro-cell structures : inflow channel, forebay, multiple wetland cells and micro-pool. When designing constructed wetland appropriate in local area, the total organic system of vertical and horizontal structure : geology, hydrology, land use, and ecological surroundings of the sites should be considered totally.

Change of Wetland Microbial Activities after Creation of Constructed Wetlands (인공습지 조성 후 습지미생물활성도 변화에 관한 연구)

  • Lee, Ja-Yeon;Kim, Bo-Ra;Park, So-Young;Sung, Ki-June
    • Journal of Environmental Science International
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    • v.19 no.1
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    • pp.17-26
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    • 2010
  • To understand the initial changes in the microbial activities of wetland soil after construction, dehydrogenase activity (DHA) and denitrification potential (DNP) of soil from 1 natural wetland and 2 newly constructed wetlands were monitored. Soil samples were collected from the Daepyung marsh as a natural wetland, a treatment wetland in the West Nakdong River, and an experimental wetland in the Pukyong National University, Busan. The results showed that the DHA of the natural wetland soil was 6.1 times higher than that of the experimental wetland and similar to that of the treatment wetland 6 months after wetland construction (fall). Few differences were observed in the DNP between the soil samples from the natural wetland and 2 constructed wetlands four months after wetland construction (summer). However, 6 months after the construction (fall), the DNP of the soil samples from the natural wetland was 12.9 times and 1.8 times higher than that of the experimental wetland and the treatment wetland, respectively. These results suggested that the presence of organic matter as a carbon source in the wetland soil affects the DHA of wetland soil. Seasonal variation of wetland environment, acclimation time under anaerobic or anoxic wetland conditions, and the presence of carbon source also affect the DNP of the wetland soil. The results imply that the newly constructed wetland requires some period of time for having the better contaminant removal performance through biogeochemical processes. Therefore, those microbial activities and related indicators could be considered for wetland management such as operation and performance monitoring of wetlands.

The Development of An Environmentally Friendly Constructed Wetland System (친환경형 식물 정화조 시스템 개발)

  • Lee, Eun-Heui;Rhee, In-Sook;Jung, Dong-Sun
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.7 no.4
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    • pp.61-68
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    • 2004
  • The purpose of this study was to develop environmentally friendly constructed wetland system in order to improve the environment. This system was constructed with two constructed wetlands andone pond. The size of the first and second wetland was 2.5m in length, 2.5m in width and 0.7m in depth for the first wetland and 0.6m in depth for the second wetland. Those were filled with pebbles with about 16~32mm in diameter from bottom to 20cm depth and onto the pebbles with about 0.5 mm in diameter sand in depth 40cm. The first constructed Wetland was planted with pragmites communis. The second was planted with Iris pseudoacorus and Acorus calamus var. aneustatus.A vertical flow system was used in the first constructed wetland and a horizontal flow system in the second. The water of outflow from the second wetland flowed into the pond. This system was installed in Yangpyeong, Kyunggi Province. The Quality of inflow and outflow were analyzed at the first time from May 20 to May 30, 2002 and at second time from June 10 to July 18, 2002. At the second period wetland was implanted with microbes in order to improve the efficiency of constructed wetlands. Following standard methods for wastewater, BOD, COD, SS, T-N and T-P were analyzed. This system was effective in reducing COD, BOD, SS, T-N and T-P level. The result shows that wastewater was purified through constructed wetland system with plants and highly purified with microbes especially in T-P. The Average total phosphorous concentration of influent and effluent in constructed wetland with microbes was 2.8mg/${\ell}$ L and 0.21mg/${\ell}$ respectively. This system can be used in rural community because this is not only effective on purification of sewage but also is harmonized with the surrounding nature.

The Effect of Physical Design Parameters on the Constructed Wetland Performance (물리적 설계인자가 인공습지의 처리효율에 미치는 영향)

  • Ham Jong-Hwa;Yoon Chun G.;Koo Won-Seok;Kim Hyung-Chul;Shin Hyum-Bhum
    • Journal of The Korean Society of Agricultural Engineers
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    • v.47 no.5
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    • pp.87-97
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    • 2005
  • The field scale experiment was performed to examine the effect of physical design parameters on the constructed wetland performance and recommend the feasible design of constructed wetland in Korean polder areas. Four sets (each set of 0.85 ha) of wetland (0.8 ha) and pond (0.08 ha) systems were used. Two different wetland systems, a wetland-pond system and a pond-wetland system, were studied to examine the effect of wetland and pond configuration. And two different length-to-width ratios were used, 2: 1 and 0.8: 1, to examine the effect of aspect ratio. A pond-wetland system was more preferable than a wetland-pond system, and also requires a smaller area than a wetland-pond system or a wetland system to reduce T-P. There was no difference in effluent concentration between the 2:1 system and the 0.8:1 system. Although the linear velocity of the 2:1 aspect was higher than the 0.8:1 aspect, resuspension was not a factor in this study due to a very low linear velocity. From this study and other literature review, it was found that design method of paddy rice field could be applied and expanded to the design of constructed wetland in Korea. Further investigation for the detailed design parameters of constructed wetland needs be continued for design method of paddy rice to be applied in full scale.

Development of Up- and Down-flow Constructed Wetland for Advanced Wastewater Treatment in Rural Communities (소규모 오수발생지역의 고도처리시설을 위한 상.하 흐름형 인공습지 개발)

  • Kim, Hyung-Joong;Yoon, Chun-G.;Kwun, Tae-Young;Jung, Kwang-Wook
    • Journal of The Korean Society of Agricultural Engineers
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    • v.48 no.6
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    • pp.113-124
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    • 2006
  • The feasibility of the up- and down-flow constructed wetland was examined fur rural wastewater treatment in Korea. Many constructed wetland process was suffered from substrate clogging and high plant stresses because of long term operation. The up- and down-flow constructed wetland process used porous granule materials (charcoal pumice : SSR=10:20:70) for promoting intake rate of nutrient to plant, and especially flow type was designed continuously repeating from up-flow to down-flow. $BOD_5$ and SS was removed effectively by the process with the average removal rate being about 75% respectively. The wetland process was effective in treating nutrient as well as organic pollutant. Removal of TN and TP were more effective than other wetland system and mean effluent concentrations were approximately 7.5 and $0.4mg\;L^{-1}$ which satisfied the water quality standard for WWTPs. The treatment system did not experience any clogging or accumulations of pollutants and reduction of treatment efficiency during winter period because constructed polycarbonate glass structure prevented temperature drop. Considering stable performance and effective removal of pollutant in wastewater, low maintenance, and cost-effectiveness, the up- and down-flow constructed wetland was thought to be an effective and feasible alternative in rural area.

Assessment of Free Water Surface Constructed Wetland Design Parameters for the Reduction of Agricultural Nonpoint Source Pollution (농업유역 비점원오염 저감을 위한 자유수면형 인공습지 설계인자 평가)

  • Jang, Jeong-Ryeol;Kwun, Soon-Kuk;Choi, Sun-Hwa
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • pp.637-642
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    • 2005
  • The objective of this study is to evaluate design parameters of free water surface constructed wetland for the reduction of agricultural nonpoint source pollution. From literature review, the key design parameters were selected as influent concentration, influent water volume, hydraulic retention time and wetland system arrangement. The design value for each parameter was established after pilot study. Full-scale constructed wetland on the basis of the designed values was constructed to evaluate those reasonableness. The results of this study showed that the designed values for free water surface constructed wetland were appropriate for the reduction of agricultural nonpoint source pollution.

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Pond-Wetland System for the Water Resources Conservation of Estuary Lake (담수호 수자원보전을 위한 유역처리 연못-습지 시스템(지역환경 \circled2))

  • 양홍모;최수명;윤광식
    • Proceedings of the Korean Society of Agricultural Engineers Conference
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    • pp.557-562
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    • 2000
  • Estuary lakes constructed for agricultural water resources development projects have encountered eutrophication problems. Natural water purification function of wetland is considered for nutrient removal from inflowing stream. A constructed wetland was designed and installed for pollutant loading abatement in estuary lake Koheung. Combined pond-wetland system was adopted. In this system primary and secondary ponds and six wetland cells were interconnected. Reed and cattail were selected for wetland vegetation and planted in the wetland cells. In this paper, design criteria of the pond-wetland system in temperate weather zone is presented.

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A Case of Analysis of Constructed Wetland Using Geographic Information System (GIS를 활용한 천변저류지 적지분석에 관한 연구)

  • Ha, Sung Ryong;Lee, Jae Yil
    • Journal of Wetlands Research
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    • v.8 no.1
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    • pp.107-112
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    • 2006
  • This study aim is to establish the suitability analysis of a constructed wetland using Geographic Information System. A constructed wetland is a flood control reservoir that is able to control flows and conserve a preserving integrity of nature maximum. It has been did that DB construction of flood area, socioeconomic analysis, and space analysis using GIS. Achieved reiteration arithmetic function from results of several elements, it has been did analysis for possibility space of constructed wetland. Through the analysis of flood area and a constructed wetland capacity, it has been established the estimation where is possible to build wetland. This study is applied suitability analysis method where has been choose the basin of To-Phyeong river in Kyongsang-namdo with methodology presentation about suitability analysis.

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Observations of Variations in Soil Organic Carbon and Carbon Dioxide in the Constructed Wetland at Goheung Bay (고흥만 인공습지의 토양유기탄소와 이산화탄소 변동 관측)

  • Kang, Dong-Hwan;Kim, Sung-Soo;Kwon, Byung-Hyuk;Kim, Il-Kyu
    • Journal of Fisheries and Marine Sciences Education
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    • v.20 no.1
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    • pp.58-67
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    • 2008
  • Seasonal variations in carbon dioxide in the air and soil organic carbon in the sediments were monitored at the constructed wetland formed by reclamation work at Goheung Bay. Sediment sampling in the constructed wetland and carbon dioxide measurement in the air were conducted on June 16 and August 23, 2007. Sediments in the constructed wetland were sampled at 11 different points (June 16) and 14 points (August 23), while carbon dioxide in the air was measured at 13 points (June 16) and 15 points (August 23). Water content and organic carbon in the sampled sediments were analyzed in the laboratory. Water content of the sediments was higher than that of general soil, and the variation between June and August was not evident. The amounts of organic carbons in the sediments sampled on August 23 were higher than those sampled on June 16. Also, there was more organic carbon in the sediments sampled at the field of reeds than in the pure wetland area. Daily maximum variation in carbon dioxide in the air was higher on June 16, but the amount of carbon dioxide in the air was greater on August 23. The results of the study suggest that organic carbon in the sediments and carbon dioxide in the air were greater in summer (August 23) than in spring season (June 16) in the constructed wetland at Goheung Bay.