Nishiya Water Purification Plant Redevelopment Project

At the Nishiya Water Purification Plant, a basic plan was formulated in FY2015 with the business scope of renewal of filtration ponds and the establishment of a granular activated carbon treatment facility.
However, the basic plan was reviewed in order to realize the treatment of all water rights water rights in the Sagamiko system at an early stage and to expand the water supply area of the Nishiya Water Purification Plant, which is a natural flow system. In this review, we considered headrace, water purification treatment, and wastewater treatment as a series of systems, proceeded with studies from an optimum perspective, and formulated a basic plan that expanded the scope of business to water treatment facilities and wastewater treatment facilities.

Nishiya Water Purification Plant Redevelopment Project Basic Plan Review [Summary Version] (PDF: 23,502KB)

The Nishiya Water Purification Plant has been promoting the earthquake resistance of facilities in order to date, but there are currently issues with aging and earthquake resistance in filtration ponds. For this reason, we will promote the earthquake resistance of these facilities in the future and carry out redevelopment, including the introduction of a water purification treatment method suitable for raw water quality.
This time, in addition to the water purification treatment facility, we have compiled an overview of the basic plan for redevelopment, including related facilities such as the basic concept development of the adjacent Yokohama Water Supply Memorial Hall.
Nishiya Water Purification Plant Redevelopment Project Basic Plan [Summary Version] (PDF: 1,392KB)

At Nishiya Water Purification Plant, some facilities have issues with aging and earthquake resistance, so we are considering redevelopment. On the other hand, in water purification treatment, powdered activated carbon is injected as a measure against odors caused by the growth of algae in Sagamiko, a water source, but it is difficult to treat it stably especially when the water quality changes rapidly. Is in a difficult situation.
Based on this situation, we are studying the introduction of an appropriate water purification treatment method according to the water quality of the water source. As one of them, joint research with private companies on granular activated carbon treatment in FY2011. We have been conducting demonstration experiments for introduction.
Furthermore, in December 2012, we set up the “Nishiya Water Purification Plant Water Purification Plant Water Treatment Method Study Group” consisting of outside experts, and have been examining while seeking opinions from specialized knowledge.
This time, we have compiled a report on the optimal water purification treatment method to be introduced at the Nishiya Water Purification Plant as a report.
Examination result report of water purification treatment method in Nishiya water purification plant [summary version] (PDF: 717KB)
Examination result report of water purification treatment method in Nishiya water purification plant (PDF: 1,853KB)