Download Analysis of decomposition process of organic component in the

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
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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
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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
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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…)
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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
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Concrete or rock
Shallow