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지하수 관개 시비의 지하수 내 질산성질소 저감 효과 평가
염여훈,김영,김문수,박선화,한경진,Yuhoon Yeum,Young Kim,Moon-su Kim,Sunhwa Park,Kyungjin Han 한국지하수토양환경학회 2024 지하수토양환경 Vol.29 No.1
In this study, the pump and fertilize (PAF) was applied to reduce nitrogen infiltration into groundwater at three corn cultivation sites over a three-year period, and its effectiveness was evaluated. PAF involves pumping nitrate-contaminated groundwater and using it for irrigation, thereby replacing the need for chemical fertilizers. This method not only substitutes chemical fertilization, but also reduces nitrogen infiltration into groundwater through root zone consumption. To confirm PAF's effectiveness, an equal amount of nitrogen was applied in each cultivation plot, either through chemical fertilizer or irrigation with nitrate-contaminated groundwater. Regular monitoring of infiltrating pore water and groundwater was conducted in each cultivation plot. The linear regression slope for nitrate concentration in the pore water after repeated application of PAF ranged from -3.527 to -8.3485 mg-N/L/yr, confirming that PAF can reduce nitrate concentration in the pore water. With an increasing proportion of PAF, the infiltrating nitrate mass in pore water was reduced by 42% compared to plots fertilized with chemical fertilizer. Additionally, the linear regression slope of nitrate concentration in groundwater was calculated as -2.2999 and -9.2456 mg-N/L/yr. Therefore, continuous application of PAF in rural areas is expected to significantly contribute to reducing nitrate concentration in groundwater.
완효성 탄소원 정제 내 citric acid의 생물학적 탈질소화 영향
한경진,염여훈,김영,권수열 한국지하수토양환경학회 2022 지하수토양환경 Vol.27 No.3
This study utilized citric acid as a floating agent in biological denitrification process and assessed its role under differentcarbon supplying conditions. Several microcosm tests including citric acid active (CAA), precipitating tablet release active(PTRA) and floating tablet release active (FTRA) were conducted to evaluate nitrate denitrification efficacy. In CAAreactors, nitrate removal was accompanied by the formation of denitrification by-products such as nitrite and nitrous oxide,with the extent of nitrate removal being proportional to citric acid concentration. These results suggest that citric acidinduced heterotrophic biological denitrification. PTRA reactor that incorporated CAA and the same electron donor showeda similar denitrification efficiency to CAA reactor. FTRA reactor, which contained the same amount of fumarate as PTRA,enhanced denitrification by 7% as compared to the PTRA reactor. The overall results of this work indicate that surpluscitric acid can be efficiently utilized in heterotrophic denitrification.