Restoration of Urban River Water Quality -- Introduction of Secondary Treated Domestic Wastewater Into the Nobidome Channel,
TOKYO UNIV OF AGRICULTURE AND TECHNOLOGY (JAPAN)
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Comprehensive surveys for water quality and benthic invertebrates were carried out in the Nobidome Channel in which filtered secondary wastewater was, introduced to restore, the waterfront. The suspended solids concentration increased downstream as a result of erosion of the bank and the bottom. Self-purification was not significant for biological oxygen demand BOD. The dominant species of periphyton and benthic invertebrates were typical of polluted streams and coincide with the poor water quality. Standing crops, however, were less than expected based on nutrient concentrations, with the major controlling factors being the lighting conditions affected by the fall of leaves from the deciduous broad-leaved trees around the channel and the stability of sediments. Distribution of Chironomidae was strictly controlled by the repeated dosage of growth-inhibition chemicals.
- Water Pollution and Control