Explanation of 47-Year BOD Alternation in a Japanese River Basin by BOD Generation and Discharge

Tsuzuki, Yoshiaki (2013) Explanation of 47-Year BOD Alternation in a Japanese River Basin by BOD Generation and Discharge. Water Air and Soil Pollution, 224 5: . doi:10.1007/s11270-013-1517-1


Author Tsuzuki, Yoshiaki
Title Explanation of 47-Year BOD Alternation in a Japanese River Basin by BOD Generation and Discharge
Journal name Water Air and Soil Pollution   Check publisher's open access policy
ISSN 0049-6979
1573-2932
Publication date 2013-04
Year available 2013
Sub-type Article (original research)
DOI 10.1007/s11270-013-1517-1
Volume 224
Issue 5
Total pages 13
Place of publication Dordrecht, Netherlands
Publisher Springer Netherlands
Collection year 2014
Language eng
Formatted abstract
Abstract Average and 75 % biochemical oxygen demand (BOD) in the Yamato-gawa River, Japan, in 1963 were smaller than the criteria determined in 1970 (5 mgl−1); however, they were deteriorated up to 22–32 mgl−1 in 1970. The deterioration was caused by the population increase and economic and urban development.The national-level regulations on ambient water quality and pollutant discharge have been established in 1970. Municipal wastewater is the major contributor in
pollutant discharges in the river basin. Estimated BOD discharge (PD(BOD)) in the river basin reduced to the level of 1963 in 2000; however, average and 75% BOD were more than the criteria. Analysis on the relationship between BOD and PD(BOD) resulted in the five phases in 1963–2009. The equilibrium conditions changed from phase I to II because of the perturbation caused by the excess BOD discharge, self-correcting mechanisms were found in phase III, and equilibrium conditions changed from phase III to IV and V. The comparison of estimated BOD based on pollutant generation (PG) without measures and monitored BOD represented the following situations in 47 years: (1) It took several years before the effects of centralised WWTPs were observed, (2) PD(BOD) was less than 35 t-BOD day−1 for the linear relationship of PD(BOD) and BOD, and (3) combined effects of wastewater treatment, river water purification facilities and soft measures
were estimated to be about 10 mg-BOD l−1 in 2010.
Keyword Alternative stable state
BOD discharge
Dynamic equilibrium
Municipal wastewater pollutant discharge
Perturbation
Water quality
Waste-Water
Ecosystems
Management
Quality
Nutrients
Framework
Pollution
Excess
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Civil Engineering Publications
Official 2014 Collection
 
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