Abstract
Modern sewerage system construction in the City of Yokohama dates from 1950. During the ensuing years, the City actively promoted such construction. The first sewage-treatment plant was commissioned in 1962, and the City's percentage of sewered population (including treatment services) reached 85% in March 1990. This paper describes the outstanding development and record of the wastewater disposal system in Yokohama (which must be ranked ahead of other Japanese cities in this area), as well as the organization, technology, administrative and financing efforts that made this development possible. It also explains the notable features of these works, which include Japan's first fully-fledged centralized sludge treatment, improvement of combined sewerage systems, industrial effluent control, effective use of sewage effluent and sludge, and sewer user charges. In addition, it presents comments on the future tasks for the 21st century, including advanced wastewater treatment and the integrated information system on water environment.
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