Refine search
Results 1-8 of 8
Evaluation on organic pollution in river water using synthetic water quality index
2002
Yoshida, F. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Uchida, H. | Seki, H.
Runoff pesticides from golf links
2000
Sasaki, K. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Terasawa, J. | Yoshida, H.
Investigation on release of nitrogen and phosphorus from the sediments of different depth in Lake Suwa [Japan]
1987
Kono, Y. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Terasawa, J. | Harada, T. | Nasu, Y. | Kugimoto, M.
For the purpose of determining the effect of dredging on nutrients releasing from the sediment at the bottom of Lake Suwa after some of its sediment has been dredged, an experiment was performed to find out how much ammonium and phosphate would release from different depths of the sediment. Lake Suwa's sediment contains a lot of nitrogen and phoshorus down to its lower layers. The results of the experiment were as follows: The speed at which ammonium released from was faster as the depth of sediment increased. The speed at which ammonium was generated in the sediment showed the highest of 2.58N micro g/g dry sediment d in a 0-10cm layer. However, ammonium showed a generation speed of 1.3-1.4N micro g/g dry sediment-d at the depth of 10cm and more, indicating that ammonium easy to release from is generated even in lower layers. The speed at which phosphorus released from was 1.3-1.7Pmg/square m d in a 0-20cm deep layer, and 0.14-0.31Pmg/square m d at the depth of 20cm and more. The speed of Phosphorus releasing from lower layers of the sediment decreased to 1/4-1/10 of that in upper layers, and it was indicated that very little phosphorus flows out of the sediment at the depth of 20cm and more.
Show more [+] Less [-]Behavior in water quality of leachate discharged from a municipal waste landfill after filling-up closing
2002
Oguchi, F. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Hosoi, Y. | Kawamata, S. | Kohno, Y. | Suzuki, T. | Itoh, S. | Hayashi, H. | Ishikawa, T.
Specific loadings from nonpoint sources in the basin of Lake Suwa [Japan]
1994
Miyajima, I. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Kouno, Y. | Kawamura, M. | Matsuzawa, K. | Terasawa, J. | Kakegawa, H.
Runoff of pesticides from paddy fields after aerial spray
1997
Sasaki, K. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Terasawa, J.
Water quality characterization of Hizawa River [Japan]
1991
Kohno, Y. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Harada, T. | Muramatsu, K. | Higuchi, S. | Kondoh, K. | Kuwabara, H.
Transition of water pollution load in Lake Suwa [Japan]
1987
Terasawa, J. (Nagano-ken. Research Inst. for Health and Pollution (Japan)) | Kawamura, M. | Higuchi, S. | Nakazawa, Y.
