Overview of the Kawai Purification Plant Facility

Kawai Purification Plant was built 10 years after the establishment of modern waterworks, during the first expansion work (Meiji 30-34) following the development of Yokohama. Currently, it is the first water purification plant among the three water purification plants in Yokohama City.
At that time, the water purification capacity was 1,000 cubic meters a day. Since then, several facilities have been expanded and expanded, and eventually reached a standard water purification capacity of 106,400 cubic meters per day (1/3 cups of Yokohama Stadium), and water has been supplied for about 50 years.
However, since the facilities are aging and there is a problem with earthquake resistance, full renovation is required, and in 2009, the PFI method (private companies from financing to facility design and construction, operation and maintenance) ), And in April 2014, filtration using ceramic membranes to produce the latest 172,800 cubic meters of tap water per day.
Water made in Kawai Purification Plant is supplied mainly to the western part of Yokohama.

The Sagamiko-based water pipes have two pipes with a diameter of 1.5m, each with a water wheel and generator.
The expected annual power generation generated by this generator will be 1.15 million kilowatt hours, equivalent to about 335 ordinary households' annual usage.

Two Sagamiko water pipes (raw water) join in this pond and are sent to Nishiya water purification plant via Tsurugamine junction well.

Homes, schools, factories, etc., located higher than the reservoir, apply pressure with a pump so that stable water can be supplied according to fluctuations in usage, adjust the amount of water and send water.

In a warehouse that stores tap water, water is temporarily stored here, the amount of water is adjusted according to the amount of water used, and distributed to homes, schools, factories, etc.
In addition, in the event of a disaster such as an earthquake, we will secure drinking water.

Kawai Purification Plant Cerarocca began operation in April 2014 as one of the largest membrane filtration facilities in Japan using ceramic membrane modules derived from its name.
There is a facility that treats wastewater after washing the filtration device and a No. 5 Reservoir (30,000m3) that temporarily stores the completed tap water.
About the structure of membrane filtration
Kawai Purification Plant Redevelopment Project