Overview of the Kawai Purification Plant Redevelopment Project

Last Updated July 27, 2020

Present Kawai Purification Plant
Kawai Purification Plant Redevelopment Schedule

Kawai Purification Plant Redevelopment Project

Kawai Purification Plant was founded in 1901 and built a major facility in operation in 1963. However, due to problems with aging and earthquake resistance, we decided to renew it.
When renewing, it is necessary to operate while operating an existing facility, so it can save space compared to the rapid sand filtration method, and effectively use the position energy due to the height difference from the water source Doshi River. We decided to adopt a membrane filtration method that can do it.
In addition, since the membrane filtration method is a new technology, PFI, which utilizes private technology and know-how. ※By adopting one method and making a business that integrates design, construction, and maintenance, the total cost can be reduced, so we decided to promote redevelopment using PFI.

※１ＰＦＩ： This is a business method that utilizes private funds and management and technical skills (know-how) to construct, maintain, and operate public facilities.

Table 1 Overview of Business
Items	Contents
Business name	Kawai Purification Plant Redevelopment Project
The other party of the contract	Water Next Yokohama Co., Ltd.
Contract amount	27,679,173,328 yen (including tax)
Business Period (total)	From April 1, 2009 to March 31, 2016
Facility maintenance period [Phase 1]	From April 1, 2009 to March 31, 2004
Facility maintenance period [Part 2]	From April 1, 2014 to March 31, 2015
Operation and maintenance period [20 years]	From April 1, 2014 to March 31, 2014
Water treatment capacity	Water production volume: 171,070m3/day or more
Water treatment method	Film filtration method (ceramic membrane)
Reservoir	Valid capacity: 30,000m3
Wastewater treatment facilities	Wastewater and dehydration treatment facilities

Business schedule

Reference Progress up to PFI operator decision
Period	Items
December 14, 2007	Announcement of Implementation Policy
March 3, 2008	Selection of specific business and publication of business requirements standard (draft)
June 3, 2008	Announcement of tender manuals, etc.
September 24, 2008	Acceptance of bids and proposals
December 4, 2008	Determination of the winning bidder
December 26, 2008	Conclusion of Basic Agreement
February 27, 2009	Conclusion of business contracts
April 1, 2009	Start of business

Water Next Yokohama Co., Ltd.
Location:	2-8-4, Kitasaiwai, Nishi-ku
Representative Director	Toru Kawakami
Date of establishment	January 22, 2009
Shareholders' equity	100 million yen
Shareholders	Metawater Co., Ltd. (person responsible for the manufacture of membrane filtration equipment, part of machinery and electrical work, part of maintenance and management) Metawater Service Co., Ltd. (third-party trustee, part of maintenance and management) Mitsubishi UFJ Lease Co., Ltd. (Financial Management) Tsukishima Machinery Co., Ltd. (Management of Effective Use of Sludge) Toden Kogyo Co., Ltd. (part of machinery and electrical work, part of maintenance and management) TEPCO Environmental Engineering Co., Ltd. (part of maintenance and management) Tokyo Electric Power Company (Energy Supply (Electricity))

Major partner companies: Kashima Construction Co., Ltd. (civil engineering and construction work), Tokyo Design Office Co., Ltd. (design and construction supervision)