식생체류지는 도시 강우유출수 관리를 위한 저영향개발 및 그린인프라 기술이며, 개발이전의 상태를 최대한 유지하는 강우유출수 관리기술로 자연을 모방하면서 생태계의 다양성을 향상시키는 기술이다. 본 연구는 식생체류지의 물순환 능력과 비점오염물질의 저감효율에 영향을 끼치는 인자를 도출하기 위하여 4개의 식생체류지 시스템에 대하여 연구를 수행하였다. 2개의 식생체류지, 즉 Type A-C와 Type A-FC에는 국화와 매발톱꽃이 식재되었으며, Type B-A와 Type B-JM식생체류지에는 진달래 및 조팝나무와 같은 관목식물이 식재되었다. 연구결과 식생체류지의 유출저감, 저류량 및 오염물질 저감에 영향을 끼치는 인자로는 TV, 침투기작, 여과재의 두께와 식생 종류로 나타났다. Type B-A와 Type B-JM식생체류지 설계시에는 유출저감, 지하수 충진, 긴 체류시간과 첨두유출량 저감과 비점오염물질 저감을 고려하여 설계가 필요한 것으로 나타났다. 반면에 Type A-C와 Type A-FC 식생체류지 설계시에는 지하수 오염 저감을 중요하게 고려하여야 하는 것으로 나타났다.
식생체류지는 도시 강우유출수 관리를 위한 저영향개발 및 그린인프라 기술이며, 개발이전의 상태를 최대한 유지하는 강우유출수 관리기술로 자연을 모방하면서 생태계의 다양성을 향상시키는 기술이다. 본 연구는 식생체류지의 물순환 능력과 비점오염물질의 저감효율에 영향을 끼치는 인자를 도출하기 위하여 4개의 식생체류지 시스템에 대하여 연구를 수행하였다. 2개의 식생체류지, 즉 Type A-C와 Type A-FC에는 국화와 매발톱꽃이 식재되었으며, Type B-A와 Type B-JM식생체류지에는 진달래 및 조팝나무와 같은 관목식물이 식재되었다. 연구결과 식생체류지의 유출저감, 저류량 및 오염물질 저감에 영향을 끼치는 인자로는 TV, 침투기작, 여과재의 두께와 식생 종류로 나타났다. Type B-A와 Type B-JM식생체류지 설계시에는 유출저감, 지하수 충진, 긴 체류시간과 첨두유출량 저감과 비점오염물질 저감을 고려하여 설계가 필요한 것으로 나타났다. 반면에 Type A-C와 Type A-FC 식생체류지 설계시에는 지하수 오염 저감을 중요하게 고려하여야 하는 것으로 나타났다.
Bioretention systems, an advance low impact development and green infrastructure approach were currently utilized in different parts of the world because it promotes biodiversity thereby mimicking and preserving the pre-developed state of an area. This study investigated and compared the capability ...
Bioretention systems, an advance low impact development and green infrastructure approach were currently utilized in different parts of the world because it promotes biodiversity thereby mimicking and preserving the pre-developed state of an area. This study investigated and compared the capability of four bioretention systems to identify factors affecting the hydraulic capabilities and pollutant removal efficiencies of each system. The two bioretention type A referred as Type A-C and Type A-FC were planted with perennials such as Chrysanthemum and Fan columbine, respectively. On the other hand, the two type B bioretention systems referred as Type B-A and Type B-JM were planted with shrub plant species such as Azalea and Japanese Meadowsweet, respectively. Based on the results, TV, infiltration mechanism, filter media depth and plant species were identified as the factors affecting the difference in flow attenuation, retained volume and pollutant removal efficiency of Type A-C, Type A-FC, Type B-A and Type B-JM bioretention systems. The design of bioretention Type B-A and Type B-JM were advantageous considering greater volume retention, groundwater recharge, longer HRT and peak flow attenuation and greater pollutant removal efficiency. On the other hand, the design of bioretention Type A-C and Type A-FC was more appropriate for design considering reduced groundwater contamination.
Bioretention systems, an advance low impact development and green infrastructure approach were currently utilized in different parts of the world because it promotes biodiversity thereby mimicking and preserving the pre-developed state of an area. This study investigated and compared the capability of four bioretention systems to identify factors affecting the hydraulic capabilities and pollutant removal efficiencies of each system. The two bioretention type A referred as Type A-C and Type A-FC were planted with perennials such as Chrysanthemum and Fan columbine, respectively. On the other hand, the two type B bioretention systems referred as Type B-A and Type B-JM were planted with shrub plant species such as Azalea and Japanese Meadowsweet, respectively. Based on the results, TV, infiltration mechanism, filter media depth and plant species were identified as the factors affecting the difference in flow attenuation, retained volume and pollutant removal efficiency of Type A-C, Type A-FC, Type B-A and Type B-JM bioretention systems. The design of bioretention Type B-A and Type B-JM were advantageous considering greater volume retention, groundwater recharge, longer HRT and peak flow attenuation and greater pollutant removal efficiency. On the other hand, the design of bioretention Type A-C and Type A-FC was more appropriate for design considering reduced groundwater contamination.
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제안 방법
The four bioretention systems were subjected to five inflow rates of 2, 3, 4, 5 and 6 L/min representing 55%, 60%, 65%, 70% and 75%, respectively of rainfall depth occurring in Cheonan city, South Korea. Experimental scenarios were demonstrated in Fig. 2 wherein chemical properties of water and plants were tested in accordance with the standard methods for examination of water and waste water and handbook of reference methods for plant analysis, respectively (APHA, AWWA, and WEF, 1992; Kalra, 1998).
Four bioretention systems were developed and investigated in this study. Type A and Type B bioretention systems were identical in media configuration but has different dimensions as demonstrated in Fig.
Bioretention systems, an innovative example of green infrastructure were currently utilized in different parts of the world due to its capability to promote biodiversity thereby mimicking and preserving the pre-developed state of an area. Four laboratory scale bioretention systems were investigated and compared to identify factors affecting the hydraulic capabilities and pollutant removal efficiencies in each system and be used to design similar bioretention system. Based on the results of this study, the followings conclusions were summarized as follows:
Although bioretention systems were widely utilized in different countries, its application in South Korea still required further evaluation. In this research, two laboratory scale system was developed for Type A and Type B bioretention systems. Specifically, this study identified design factors affecting the performance of four bioretention systems in reducing stormwater peak flow, runoff volume and pollutants.
In this research, two laboratory scale system was developed for Type A and Type B bioretention systems. Specifically, this study identified design factors affecting the performance of four bioretention systems in reducing stormwater peak flow, runoff volume and pollutants.
대상 데이터
Each experimental run was conducted during 120 min. The four bioretention systems were subjected to five inflow rates of 2, 3, 4, 5 and 6 L/min representing 55%, 60%, 65%, 70% and 75%, respectively of rainfall depth occurring in Cheonan city, South Korea. Experimental scenarios were demonstrated in Fig.
데이터처리
Lastly, pollutant mass reduction of the system was calculated by dividing the difference of the summation of influent and summation of effluent loading with the summation of influent loading, also known as summation of loads method. Results were statistically analyzed using SYSTAT 12 and Origin Pro 8 package software including analysis of variance (one-way ANOVA). Significant differences between parameters were accepted at 95% confidence level, signifying that probability (p) value was less than 0.
성능/효과
1) Greater total facility volume of Type B bioretention systems and infiltration mechanism employed in bioretention Type B yielded to increased volume retained, longer HRT and longer peak flow attenuation compared to Type A.
2) The four bioretention systems significantly reduced TSS, TN and TP concentrations (p<0.05) signifying that the bioretention systems developed were effective in particulate and nutrient reduction.
3) Total facility volume, infiltration mechanism, filter media depth, longer HRT and plant species were identified as the factors affecting the difference in pollutant removal efficiency between Type A and Type B bioretention systems.
The design of bioretention Type B-A and Type B-JM were advantageous considering greater volume retention, groundwater recharge, longer HRT and peak flow attenuation and greater pollutant removal efficiency. On the other hand, the design of bioretention Type A-C and Type A-FC was more appropriate for design considering reduced groundwater contamination.
08). These results signified that 94%, 93%, 94% and 92% TSS load reduction were attained by Type A-C, Type A-FC, Type B-A and Type B-JM, respectively. The results also showed that Type A and Type B bioretention systems exhibited good nutrient reduction evident through the load ratios of TN and TP.
후속연구
On the other hand, the design of bioretention Type A-C and Type A-FC was more appropriate for design considering reduced groundwater contamination. The findings and design factors identified in this study may be significantly used to design and improve the performance of similar bioretention system in the future.
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