1. Kyosuke Fukuhara City of Yokohama
A Renovation Project for a Centralized Sewage Sludge Treatment Plant Including Transfer of Existing Facility O&M, Using a PFI Scheme
Kyosuke Fukuhara
City of Yokohama

2. Contents Outline of Yokohama and its wastewater treatment system
Renovation of the incineration facilities at the Hokubu Sludge Treatment Plant
Description of the PFI project
Issues for the future

3. City of Yokohama City Information Land Area 435 km2 Population
Tokyo
30 km
Yokohama
Tokyo
Bay
City Information
Land Area
435 km2
Population
3.7 million

4. The State of Wastewater Treatment in Yokohama
Wastewater Treatment Plant
Sludge Treatment Center
Pumping Station
Item
Value
Sewerage Service Rate
99.9%
Treated Wastewater
1.6mil.m3/day
Treatment zones
9 zones
Wastewater Treatment Plant
11 places
Sludge Treatment Center
2 places
Pumping Station
26 places
Total Sewer Length
11,800 km
Tokyo
Bay

5. Sludge Treatment Plants
Hokubu II WTP
Sakae II WTP
Tsuzuki WTP
Kohoku WTP
Kanagawa WTP
Kanazawa WTP
Nambu STC
Chubu WTP
Nanbu WTP
Seibu WTP
Sakae I WTP
Pumping Station
Tokyo
Bay
Item
Value
Average wastewater inflow
1.6 million m3/day
Residuals intake at sludge treatment plants
15,000 m3/day
Hokubu Ⅰ WTP
Hokubu STC
　　Sludge Pipeline
　　Wastewater Treatment Plant
Sludge Treatment Center

6. Process of Sludge Treatment
Digestion Gas
Digestion
Incineration
Dewatering
Thickening

7. Incineration Facilities at the Hokubu Sludge Treatment Plant (existing)
No.3 incinerator
No.4 incinerator
＊PFI
　Private
　Finance
　Initiative
No.5 incinerator

8. Incineration Facilities at the Hokubu Sludge Treatment Plant (after renovation)

9. Data on Incineration Capacity
After renovation based on the PFI project
Existing
Incineration volume
Start of operation
Operating status
No. 1
100 t/day
1981
Application filed for decommissioning
No. 2
1985
No. 3
150 t/day
1987
In operation
No. 4
1989
No. 5
200 t/day
2007
Treatment volume
Start of operation
Operating status
Bio-charcoal production facilities
200 t/day
2019
In operation
New No. 1
2020
No. 4
150 t/day
1989
Out of operation
No. 5
2007

10. Outline of the PFI Project
Name
Project for sewage sludge treatment and effective use
at the City of Yokohama Hokubu Sludge Treatment Plant
Method
Build, transfer, and operate (BTO) method / hybrid type
Period
August 2016 – March 2039
Design & construction period: 5 years & 8 months
Operation & maintenance period: 22 years
　　　　(beginning with the existing facilities in April 2017)
Operator
Yokohama Bay Link Corporation
Cost
41,864,793,000 yen VFM: 6.1%

11. PFI Project Schedule FY Facility name 2016 2017 2018 2019 2020 2021
･･･
2038
Existing
Nos. 1 and 2 incinerators
Removal
New
Bio-charcoal production facilities
Construction
Maintenance
No. 3 incinerator
New No. 1 incinerator
No. 4 incinerator
Shutdown
No. 5 incinerator
Soil improvement plant
Separate management
New soil improvement plant

12. Outline of the Bio-Charcoal Production Facilities
Combustion exhaust gas
Dewatered residuals
Drier exhaust gas
Steam
Residuals measurement hopper
Wet electrostatic precipitator
Dry scrubber
Smoke treatment tower
Fuel
Recombustion furnace
Waste heat boiler
Pyrolysis gas
Residuals feed pump
Carbonizing furnace
Stabilization hopper
Residuals drier
Carbide humidifier
Bio-charcoal hopper
Hot-blast furnace for carbonization
Bio-charcoal

13. Conceptual Image of Bio-Charcoal Production Facilities When Completed

14. Outline of the New No. 1 Incinerator
Primary air
preheater
Waste heat
boiler
Atmosphere
Treated wastewater
Primary air
blower
Ceramic filter
Exhaust pipe
Residuals
Cyclone
Fixed quantity feeder
Induced draft fan
Drier
Cake transportation pump
Ash hopper
Secondary air preheater
Secondary air blower
Auxiliary burner
Incinerator
Improved soil
Auxiliary fuel
Wastewater

15. Conceptual Image of the New No. 1 Incinerator When Completed

16. Outline of the Soil Improvement Plant
Unslaked lime hopper
Incineration ash hopper
Residual soil from construction sites
Picking conveyor (with magnetic sorter)
Hopper for residual soil
Secondary
mixer
Primary
mixer
Residual soil
conveyor
Sorter for
residual soil
Primary classifier
Secondary classifier
Unsuitable items:
Asphalt debris
Concrete debris
Natural stone, etc.
Unsuitable items:
Metal Plastic, etc.
Unsuitable items
Particle diameter of 40 mm or more
Improved soil (granule diameter of
20 – 0 mm)
Improved soil
(granule diameter
of 40 – 0 mm)

17. Conceptual Image of the Soil Improvement Plant When Completed

18. Project Scheme Yokohama Bay Link Corporation Project contract
(PFI operator)
Project contract
City of Yokohama
Facility use agreement
Project monitoring
Procurement of funds
Facility design, construction, and operation
Fuel production facilities
Dewatering
unit
Incineration facilities
Digestion tank
Residuals cake
Digested
sludge
Payment of fee
for service purchase
Incineration ash
Fuel produced
(bio-charcoal)
Storage hopper
Soil improvement plant
Sewage sludge
Fuel produced
(sale to businesses)
Payment of fee
for sale
Payment of fee for sale
Improved soil
Wastewater treatment centers
Improved soil user
Facilities making effective use of the fuel

19. Issues for the Future
Simultaneous and parallel work – facility dismantling, construction, and management
Related laws and ordinances
Transfer of work to successors

20. Nocturnal View of Yokohama Harbor