Kawai Purification Plant Facility Overview

Ten years after the establishment of modern water supply, Kawai Purification Plant was built in 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 per day. After that, several facilities were expanded, expanded, expanded and expanded and expanded, and eventually the standard water purification capacity was 106,400 cubic meters per day (1/3 cups of Yokohama Stadium), and water has been supplied for about 50 years.
However, due to the aging of facilities and problems with earthquake resistance, full renovation was required.In 2009, the PFI method (private companies started financing, design, construction, operation, and maintenance), and in April 2014, it was reborn as a state-of-the-art water purification plant that produces 172,800 cubic meters of tap water per day by filtering using a ceramic membrane.
Water produced in Kawai Purification Plant is supplied mainly to the western part of Yokohama City.

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

Two Sagamiko water pipes (raw water) join in this pond and 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 changes in usage, adjust the amount of water, and feed water.

In a warehouse that stores tap water, the water is once stored here, the amount of water is adjusted according to the amount used, and distributed to homes, schools, factories, etc.
Also, 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.
It has a facility that treats wastewater after cleaning the filtration device and a No. 5 distribution reservoir (30,000m3) that temporarily stores the completed tap water.
membrane filtration's Framework
Kawai Purification Plant Redevelopment Project