Improved soil plant PFI project

Regarding the improved soil plant business that effectively utilizes the incineration ash of sewage sludge, we will expand existing facilities in order to expand effective use.
The design and construction of this facility expansion and the maintenance and operation of the entire improvement soil plant will be implemented as a project based on the "Law Concerning the Promotion of Maintenance of Public Facilities by Utilizing Private Funds" (PFI Law).
Improved soil is soil that is made by mixing about 10% of incinerated ash into soil excavated during sewerage work, etc., to use high-quality backfill material.
The incineration ash of sewage sludge contains a lot of lime that makes the soil of high quality, and also has the effect of absorbing the moisture of the soil. Focusing on the nature of this incinerated ash, we have installed an improved soil plant on the site of Hokubu No.2 Wastewater Treatment Plant to produce improved soil.
Improved soil plants play a part in extending the life of landfill sites and forming a recycling-oriented society by effectively utilizing incinerated ash that has been landfilled.

Announcement of Implementation Policy in September 2002
October 2002 Selection of Specified Business
Announcement of Application Guidelines for December 2002
January 2003 Additional Application Guidelines
Answer to questions regarding the application guidelines
March 2003 Selection of Contract Negotiators
March 2003 This Agreement
July 2003 planning, design, and construction of improved soil plants
January 2004 Delivery of facilities and commencement of operation
End of the business in March 2019 (initial extension of the business for 5 years from March 2014)