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Analysis of decomposition process of organic component in the Yamato River Masanobu TANIGUCHI Wakayama University, Japan Japanese water pollution problems Human uses and drinks water . The used water of 30% flows into river directly. The river contaminated by nitrogen, that origin organic components. The Sewage System 12th International Riversymposium Diffusion rate 70% Locate of Yamato River Basin The river length is 68km and the river contributory area is 1070 km2. 2,000,000 people live in the Yamato River Basin. The sewage systems covered about 55% of housing sites in 2000. Osak a Huku oka To kyo Japan Tatsuta River A1 A2 A3 Yamato River B1 ⑤ kamenose B2 Nara City Kasaoki Mountain Osaka Bay Fujii Basin Observer Sewage disposal facility sewage plant A1~B2 Sample Points Osaka Prefecture Nara Prefecture Ishikawa River 12th International Riversymposium Hatsuse River (Yayato River) River ) 0 1 0km Environment of the river through which sewage flows. Summer Winter Upper Stream A1 Deep Depth(over 50cm) lasher Plants lasher A3 No Plants Shallow Depth (less than 50cm) B2 Lower Stream 12th International Riversymposium Sewage Water What is occur in the river? Human uses and drinks water . The used water of 30% flows into river directly, the treatment water includes 7mg/l of total nitrogen at average, includes 12mg/l of total nitrogen at maximum. The nitrogen changes from organic components to inorganic components by biological process. Biological activity is high in summer and low in winter. (Organic matter decomposition, nitrification, photosynthesis etc…) 12th International Riversymposium CONCLUSION Organic compound NH4+ NO3- 1.0-0.7 1.0-0.7 Flow into river 0.8-1.0 0.7-0.9 Flow into river 0.1-0.9 0.3-0.8 Season Reaction occurred until photosynthesis Slow reaction Summer Winter Alluvial deposit Depth Concrete Infiltration Deep 12th International Riversymposium Concrete or rock Shallow