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Evaluation for Impacts of Nitrogen Source to Groundwater Quality in Livestock Farming Area
Gyeong-Mi Lee,Sunhwa Park,Ki-In Kim,Sang-Ho Jeon,Dahee Song,Deok-hyun Kim,Tae-Seung Kim,Seong-Taek Yun,Hyen Mi Chung,Hyun-Koo Kim 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.5
We investigated 52 livestock farming complexes in Gyeong-Gi and Incheon provinces based on low, medium, and high livestock density and groundwater quality. The objective of this study was to evaluate a relationship between nitrate N concentration in groundwater and animal factors, such as livestock density and animal species. 2,200 groundwater samples for 3 years from 2012 to 2014 at Gyeong-Gi and Incheon provinces were collected and analyzed for pH, EC, DO, ORP, temperature, major anions and cations, such as NO₃-N, HCO₃<SUP>-</SUP>, PO₄<SUP>-</SUP>, SO₄<SUP>2-</SUP>, Cl<SUP>-</SUP>, NH₄-N, K<SUP>+</SUP>, Na<SUP>+</SUP>, Ca<SUP>2+</SUP>, Mg<SUP>2+</SUP>, T-N, and TOC. Average concentration of total N for generated load density was 23,973 g day<SUP>-1</SUP> km<SUP>-2</SUP> for cattle, 51,551 g day<SUP>-1</SUP> km<SUP>-2</SUP> for pig, and 52,100 g day<SUP>-1</SUP> km<SUP>-2</SUP> for poultry. For animal feeding species, average ratio for generated load over discharge load was 16.1% for cattle, 7.8% for pig, and 7.1% for poultry. Therefore, cattle feeding region is highly vulnerable for water pollution compared to pig and poultry feeding areas. The concentrations of chloride, nitrate, and total N in the groundwater samples were higher at high animal farming regions than other regions. The average concentration of nitrate, and chloride in groundwater samples was 5.0 mg L<SUP>-1</SUP>, 16.6 mg L<SUP>-1</SUP> for low livestock density, 6.9 mg L<SUP>-1</SUP>, 17.7 mg L<SUP>-1</SUP> for medium livestock density and 7.6 mg L<SUP>-1</SUP>, 22.7 mg L<SUP>-1</SUP> for high livestock density and total nitrogen (T-N) was 7.7 mg L<SUP>-1</SUP> for low livestock density, 9.4 mg L<SUP>-1</SUP> for medium livestock density, 10.7 mg L<SUP>-1</SUP> for high livestock density. In conclusion, based on this research, for managing groundwater quality near livestock farming regions, Ca-(Cl+NO₃) group from the Piper diagram is more efficient than using 19 factors for water quality standard.
Evaluation for Impacts of Nitrogen Source to Groundwater Quality in Livestock Farming Area
Lee, Gyeong-Mi,Park, Sunhwa,Kim, Ki-In,Jeon, Sang-Ho,Song, Dahee,Kim, Deok-hyun,Kim, Tae-Seung,Yun, Seong-Taek,Chung, Hyen Mi,Kim, Hyun-Koo 한국토양비료학회 2017 한국토양비료학회지 Vol.50 No.5
We investigated 52 livestock farming complexes in Gyeong-Gi and Incheon provinces based on low, medium, and high livestock density and groundwater quality. The objective of this study was to evaluate a relationship between nitrate N concentration in groundwater and animal factors, such as livestock density and animal species. 2,200 groundwater samples for 3 years from 2012 to 2014 at Gyeong-Gi and Incheon provinces were collected and analyzed for pH, EC, DO, ORP, temperature, major anions and cations, such as $NO_3-N$, ${HCO_3}^-$, ${PO_4}^-$, ${SO_4}^{2-}$, $Cl^-$, $NH_4-N$, $K^+$, $Na^+$, $Ca^{2+}$, $Mg^{2+}$, T-N, and TOC. Average concentration of total N for generated load density was $23,973g\;day^{-1}\;km^{-2}$ for cattle, $51,551g\;day^{-1}\;km^{-2}$ for pig, and $52,100g\;day^{-1}\;km^{-2}$ for poultry. For animal feeding species, average ratio for generated load over discharge load was 16.1% for cattle, 7.8% for pig, and 7.1% for poultry. Therefore, cattle feeding region is highly vulnerable for water pollution compared to pig and poultry feeding areas. The concentrations of chloride, nitrate, and total N in the groundwater samples were higher at high animal farming regions than other regions. The average concentration of nitrate, and chloride in groundwater samples was $5.0mg\;L^{-1}$, $16.6mg\;L^{-1}$ for low livestock density, $6.9mg\;L^{-1}$, $17.7mg\;L^{-1}$ for medium livestock density and $7.6mg\;L^{-1}$, $22.7mg\;L^{-1}$ for high livestock density and total nitrogen (T-N) was $7.7mg\;L^{-1}$ for low livestock density, $9.4mg\;L^{-1}$ for medium livestock density, $10.7mg\;L^{-1}$ for high livestock density. In conclusion, based on this research, for managing groundwater quality near livestock farming regions, $Ca-(Cl+NO_3)$ group from the Piper diagram is more efficient than using 19 factors for water quality standard.
한재경 ( Jae Gyeong Han ),김태기 ( Tae Gi Kim ),박장우 ( Jang Woo Park ),김미경 ( Mi Gyeong Kim ),박지민 ( Ji Min Park ),이인욱 ( In Wook Lee ),전은정 ( Eun Jeong Jeon ),우형택 ( Hyung Taek Woo ) 대구가톨릭대학교 자연과학연구소 2013 자연과학연구논문집 Vol.11 No.1
The purpose of this study is to identify the effects of ecological experience on the university students`` environmental consciousness. Experimental group was appeared high in the post-test in environmental consciousness(p<.05). Comparative group was appeared high in the post-test in environmental consciousness but there was not any statistically significant difference in the change. The result shows that ecological experience is very helpful for university students to realize the importance of environmental pollution and conservation of nature. Consequently, the environment education in a school or a society is expected to introduce ecologically useful programs applying elements of natural environment and activating natural experience activities through those programs.
Effect of Mn Addition on Microstructural Changes and Mechanical Properties of Ti–5Al–2.5Fe Alloys
Gyeong Ryeong Bak,Dae‑Won Jeong,Yong Taek Hyun,Hyun Soon Park 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.6
The microstructures and mechanical properties were investigated in newly developed Ti–5Al–2.5Fe and Ti–5Al–2.5Fe–2Mnalloys, which were fabricated by two-step hot rolling processes. Lamellar structures were observed in the Ti–5Al–2.5Fe–2Mnalloy aged at 600 °C for 24 h, depending on the viewing directions (normal, rolling, and transverse). In the aged Ti–5Al–2.5Fe alloy, a spheroidized α matrix and TiFe precipitates in the α grain boundary were observed, with a crystallographicorientation relationship of (011)TiFe//(0110)α. It was found that Mn addition improved the mechanical properties, attributedto the increased β phase (approximately 4.3 times relative to the Ti–5Al–2.5Fe alloy) and solid solution strengthening. Interestingly, in the Ti–5Al–2.5Fe alloys, the oxygen was enriched by the TiFe phase rather than the α phase, which mayweaken the oxygen solute dragging effect.