The Source of Refractory Organic Matters in Lake Biwa: Estimation by Biodegradation Assay in Generation Sources and Box Model
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- SATO Yuichi
- Lake Biwa Environmental Research Institute
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- OKAMOTO Takahiro
- Lake Biwa Environmental Research Institute
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- HAYAKAWA Kazuhide
- Lake Biwa Environmental Research Institute
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- OKUBO Takuya
- School of Environmental Sciences, the University of Shiga Prefecture
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- KOMATSU Eiji
- Graduate School of Life and Environmental Sciences, University of Tsukuba
Bibliographic Information
- Other Title
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- 琵琶湖における難分解性有機物の起源:発生源における生分解試験とボックスモデルによる推計
- ビワコ ニ オケル ナン ブンカイセイ ユウキブツ ノ キゲン : ハッセイ ゲン ニ オケル セイブンカイ シケン ト ボックスモデル ニ ヨル スイケイ
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Abstract
In Lake Biwa, the gap between biochemical oxygen demand (BOD) and chemical oxygen demand (COD) is widening, so the increase in the amount of refractory organic matter has been of concern. The objective of this study is to estimate the source and the cause of the increase in the amount of refractory organic matter. In order to investigate the material flow using the box model, the generation (or inflow) load in the watershed and internal production are calculated by monitoring COD and total organic carbon (TOC) by biodegradation assay in drainage from each pollution source and lake water. As a result, it is revealed that although the generation load of organic matter has been reduced by domestic and industrial measures, the main cause is the reduction of labile organic matter. Model results indicate that autochthonous organic matter is the dominant source of refractory organic matter in the lake but is at the same level as the allochthonous organic matter in the case of the dissolved fraction. It is most likely that the change in the amount of the autochthonous organic matter caused the increase in the amount of refractory dissolved organic matter.
Journal
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- Journal of Japan Society on Water Environment
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Journal of Japan Society on Water Environment 39 (1), 17-28, 2016
Japan Society on Water Environment
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Details 詳細情報について
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- CRID
- 1390001205082226432
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- NII Article ID
- 130005118940
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- NII Book ID
- AN10372439
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- ISSN
- 18813690
- 09168958
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- NDL BIB ID
- 027791412
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed