The TOC Concentration in the River Waters Does not Return to the Early 1960s

The concentrations of Biochemical oxygen demand (BOD) and ammonium nitrogen in river waters is returning to the early 1960s, but potassium permanganate consumption and total organic carbon (TOC) concentrations does not return. It is thought that their cause comes from the not decreasing of the refra...

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Bibliographic Details
Published inJournal of Environmental Chemistry Vol. 22; no. 2; pp. 73 - 75
Main Authors TAKAHASHI, Yasuo, ONODERA, Sukeo
Format Journal Article
LanguageJapanese
Published Japan Society for Environmental Chemistry 2012
Subjects
potassium permanganate consumption
refractory dissolved organic matter
river water
total organic carbon
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ISSN0917-2408
1882-5818
DOI10.5985/jec.22.73

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Summary:The concentrations of Biochemical oxygen demand (BOD) and ammonium nitrogen in river waters is returning to the early 1960s, but potassium permanganate consumption and total organic carbon (TOC) concentrations does not return. It is thought that their cause comes from the not decreasing of the refractory dissolved organic matter. It seems that refractory dissolved organic matter in raw water is originated from treated water of wastewater treatment plant. These organic compositions of hydrophobic organic matter and hydrophilic organic matter in refractory dissolved organic matter are not elucidated.
ISSN:0917-2408
1882-5818
DOI:10.5985/jec.22.73