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( Nash Jett Dg. Reyes ),( Franz Kevin F. Geronimo ),( Hyeson Choi ),( Lee-hyung Kim ) 한국물환경학회(구 한국수질보전학회) 2019 한국물환경학회·대한상하수도학회 공동 춘계학술발표회 Vol.2019 No.-
The use of constructed wetlands (CW) has been recognized globally as a form of nature-based solution (NBS) for water treatment technology. Aside from water detention, CW can also trap heavily-polluted sediments from the influent. This study mainly focused on the characterization of pollutants found in the sediments of two constructed wetlands treating runoff from different types of land uses. Combined sediment and water quality analyses were also conducted to determine the interrelationship between the two components of the CW. Experimental results showed that TN, TP, and COD concentrations from livestock CW sediments are higher as compared to agricultural CW due to the contributions of animal manure. It was also noted that pollutant-rich sediments were already removed in the settling basin, thus reducing the pollutant concentration of the sediments found on the succeeding cells in the CW. Finally, the interrelationship between water and sediment quality were impacted by mechanisms such as agitation and equilibration. The findings of this study can provide significant knowledge in understanding the mechanisms that can potentially affect the treatment efficiency of a CW. Additionally, effective maintenance methods and schedules can be devised following the identification of factors governing the treatment processes within the CW.
Nash Jett DG. Reyes,Franz Kevin F. Geronimo,Hyeseon Choi,Minsu Jeon,Lee-Hyung Kim 대한환경공학회 2024 Environmental Engineering Research Vol.29 No.5
The terrestrial environment generally serves as an important carbon pool. This study mainly assessed the properties and carbon storage capabilities of soils from different urban land uses. Soil samples from roads/highways, parks, institutional areas, and constructed wetlands were collected to assess the effects of soil sealing on the characteristics and carbon content of urban soils. Soil sealing and compaction greatly influenced urban soil properties by altering the mass-balance, thereby resulting in a disproportionate amount of inflow and outflow of compounds in the soil strata. Using the Walkley-Black and loss-on-ignition (LOI) methods of soil organic carbon (SOC) analysis demonstrated that LOI-based analysis yielded up to 26 times higher SOC values than the wet-oxidation method due to the high weight losses prompted by the volatilization of hygroscopic and structural water and thermal decomposition of carbonate-containing minerals. Further analyses indicated that open soils contain 5% to 78% higher percentage of organic carbon as compared with their sealed counterparts and top soil layers tend to have higher amounts of SOC due to the continuous deposition of carbon-containing compounds from external sources. Generally, the results of this inquiry can serve as a baseline for formulating strategies to augment pedologic carbon stocks in urban environments.