Micro hydraulic power stations
放流きょ
outfall
sewer
From secondary
第二沈殿池よりtank
sedimentation
generator
outlet
discharging gap
The outfall for the treated water is installed several
meters higher than the sea level to protect from flood
tide. There are 3 stations that generate around
800,000kWh electricity/year using the discharging gap
(that equals to electricity consumption for 230
ordinary households). Hydropower generation is
capable to generate more stably than solar power
generation or wind power generation. Moreover, it is
the clean energy that does not emit greenhouse gas
causes global warming. Also it is transferred to a
third party through Tradable Green Certificates as
environmental valued energy.
system connection
with the commercial
electricity
●Operation started: June 2005
Solar photoelectric Generation
There are no tall buildings around the Eastern facility
of the Center, and therefore 4,480 sheets of solar cell
modules of 250 W have been installed on the shelter
coverings of the openings of reaction tanks. The
maximum power output is 1MW, and the power of
1.15 million kWh (equivalent of the power
consumption of 330 households) is obtained annually.
●Operation started: April 2016
Hydraulic power generation and solar photoelectric
generation are the sources of clean energy, which does
not emit greenhouse gases such as carbon dioxide.
These kinds of power generation reduce 950 tons of
carbon dioxide annually, contributing to the reduction
of environmental load.
Water environment cultivated by the district
Morigasaki Water Reclamation Center
Earth-kun, the mascot character
of Bureau of Sewerage
Guide map
Ohmori
station
OhmoriKaigan station
Tokai
Ryutsu ●
Center
station
Annular
line 7
Tokyo Rosai Hospital
□Keihin
Hospital
Keihinkyuko
line
Address:
Access:
Jonanjima
Bureau of Sewerage in Tokyo website
Jonan-ohashi
Heiwajuima
station
Showajuima
station
JR line
Southern Sludge
Treatment Plant
Tokyo Port
Wild Bird Park
Heiwajima
Kyowabashi
Keihin-ohashi
Jonanjima Pump facility
Keihinjima
East
series
Entrance
Morigasaki Water
Reclamation Center
West series: 5-2-25, Ohmori-minami, Ota-ku, Tokyo 143-013 (office)
East series: 2-5-1, Showajima, Ota-ku, Tokyo 143-0004
Tel : 03-3744-5981
Terminal station of Keikyu Bus (for Morigasaki) from Ohmori station or
Kamata station on JR line
No thoroughfare for vehicles between East site and West site.
Tokyo Amesh
Tokyo Amesh is the system that
shows rainfall in and around
Tokyo in real time.
The rainfall is measured by
radars and ground rain gauges.
※Tokyo Amesh is the registered
trademark of the Tokyo
Metropolitan Government.
Virtual Sewerage
Animation and video are used to allow people to experience the
sewerage system in a fun way that would not be normally possible.
Beware of crocked dealer who pretend to be related
to the Bureau of Sewerage!
The Bureau of Sewerage does not rely on businesses
to repair or clean drainage facilities in housing.
Morigasaki Water Reclamation Center is the largest water reclamation
center in Japan that is organized with two facilities in the east and west. The
treatment area includes the whole area of Ota-ward, most of Shinagawaward, Meguro-ward, Setagaya-ward, part of Shibuya-ward and Suginamiward, consequently the whole area amounts to 14,675ha. That equals to the
one-forth of the whole ward area. Also it accepts wastewater from Nogawa
treatment area in Tama-district. The treated water is discharged to Tokyo Bay.
Some wastewater is filtrated with the sand and used for washing or refrigerating
machines of the Center and for toilet water, and also supplied to Ota Waste
Incineration Plant. The generated sludge is pumped through pressure pipelines to
Southern Sludge Plant with the sludge sent from Shibaura Water Reclamation
Center.
Facility tours of water reclamation centers are available
except weekends, holidays, and the New Year's season.
Please contact us about reservations and details.
Operation started：
April 1966 (stormwater drainage)
April 1967 (water treatment)
Site area : 415,309㎡
«Contact point for arranging facility tours»
Telephone: 03 (3241) 0944
Hours: 9:00 - 17:00 (weekdays only)
Sludge treatment facilities:
3 Thickeners
4 Digesters
1 Sludge elutriation tank
Stormwater storage tank: 26,000㎥
Storage tank in wet weather: 92,000㎥
平成29年3月発行：東京都下水道局総務部広報サービス課 〒163-8001 新宿区西新宿2−8−1
03-5320-6515 FAX03-5388-1700 平成28年度規格表第4類登録第82号
Nakagawa
River
Morigasaki Water Reclamation Center
Tama River
Average quality of influent and final effluent
（As of April 2017)
Treatment capacity: 1,540,000㎥/day
Facility tours of Water Reclamation Centers
Treatment area
Water treatment facilities
Western facility:
28 grit chambers
11 primary sedimentation tanks
12 reaction tanks
24 secondary sedimentation tanks
The final effluent from the water reclamation center complies completely with
the water quality standards of the Tokyo Metropolitan Environmental Security
Ordinance and is sufficiently clean for fishes to live in.
(Units: mg/L)
Item
BOD
COD (Mn)
Eastern facility:
18 primary sedimentation tanks
11 reaction tanks
20 secondary sedimentation tanks
Influent
Final effluent
Regional water
Ormori Ohta West East quality standards,
ordinance
trunk trunk series series
120
120
3
6
72
73
7
8
35 or below
Total nitrogen
28.7
26.0
12.0
12.2
30 or below
Toｔal phosphorus
3.0
2.9
0.8
1.7
3 or below
Average values of 24-hour test conducted in FY2015
*The higher values of BOD and COD indicate the higher levels of water
contamination. BOD describes the amount of oxygen required by microorganisms
to eat organic material in water, and COD describes the amount of oxygen
required by oxidizer to decompose organic material in water. The quality levels of
discharged water are specified in terms of BOD for rivers and COD for seas. Total
nitrogen and total phosphorus are closely related to the generation of red tides.
Water reclamation center
Sewerage System Components
Grit chamber
The sewerage system is principally made up of 3 facilities.
Sewers, which collect and carry wastewater.
Pumping stations, where wastewater is pumped up so that the sewers do not get too deep.
Water reclamation centers, where wastewater is treated to be clean water.
Inspections, cleaning, and repairs are done daily in order to make sure each of these
facilities works properly.
Factory
This is the first tank that wastewater flows in. Large particulate
matter is removed and sediments
are caused to settle.
Primary
sedimentation tank
Wastewater flowed through slowly
for 2 to 3 hours and easily
submersible contamination settles.
Above-ground
park space
Home
Secondary
sedimentation tank
Reaction tank
Mud containing microorganisms
(activated sludge) is added, air
is pumped in, and the sewage is
agitated for 6 to 8 hours. The
microorganisms break down the
contaminants in the wastewater,
and fine particulates attach to the
microorganisms causing them
to form an easily submersible
mass.
Mud (activated sludge) masses
formed in the reaction tank are
precipitated for 3 to 4 hours,
resulting in the separation into
of a supernatant (treated water)
and sludge.
Advanced Wastewater
Treatment
Implementation of the following facilities is
underway in order for further clean water.
★Sand Filtration/Biological Membrane Filtration
Removes fine floc that the secondary
sedimentation tank was not able to remove
completely.
★A2O process
Effectively removes nitrogen and phospho- rus
from sewage in the reaction tank.
Sludge Treatment
Facilities
Water discharge
Manhole
Pre-treatment facility
for industrial wastewater
A facility where water
is treated for harmful
substances such as
heavy metals.
Chlorination tank
Sewers
Pumping Stations
The pipes that carry wastewater to the water reclamation center.
These pipes range in diameter from 25 cm to 8.5 m.
Sewers are installed at an angle so that the wastewater flows naturally.
When they get to a certain depth, wastewater is pumped to a position near to
the surface and the natural flow restarts.
The Role of Tokyo Sewerage System
Improvement of Living
Environment through
Wastewater Treatment
Preventing Flooding
through the Removal
of Stormwater
Wastewater discharged
from homes and factories is
treated to ensure a comfortable
living environment.
The city is protected from
flooding through the speedy
removal of stormwater on
land surface.
East
Ground map East series entrance
of the center Storage tank in wet weather
Southern Sludge
Plant Connection
Facility
Reaction tank (deep tank)
Storage tank in wet weather
Biomass
generator
micro hydraulic
generator
Legends
Stormwater
storage tank
Tokyo Bay
Sludge
treatment
industry
Metropolitan
expressway
Ohmori-minami
pump room
Side
entrance
Grit chamber
Micro hydraulic
generator
Biotope
Firefly Park
Primary sedimentation tank
West series
without sludge treatment facilities
send sludge to centers that have
sludge treatment facilities.
Discharging outlet
Chlorination tank
Sand filtration facilities
Sludge is gently precipitated and separated into
t he s u p er n a t an t an d
thickened sludge.
Thickened sludge is
warmed nearly for 2 weeks
at 51℃ and separated to
methane gas, supernatant
and digested sludge.
*There is no digester at some
water reclamation centers.
Chimney
Thickened sludge and
digested sludge are
dewatered.
Dust
collector
Incinerator
Dewatered sludge is burned to ash.
Characteristics of Morigasaki Water
Reclamation Center
Image of regular generating by biomass
Water treatment facility
Sludge generated in wastewater treatment method is warmed
in the digester, then organic substances in the sludge become
methane gas and the amount of sludge is reduced. *1
22.8 kWh of electricity annually has been generated by using
methane gas, the biomass energy *2, as fuel for generating
facilities.
Regarding installation and management of the generating
facilities, we introduced PFI *3 first domestically in sewerage
works. It leads to cost reduction of facility building or
maintenance/management.
Also it is transferred to a third party through Tradable Green
Certificates as environmental valued energy.
●Started in April 2002
* 1 : T o w a rm u p th e s lu d g e, w a rm w a ter from g en era tin g
fa cilities a n d w a is t h ea t w a rm w a ter from S ou th ern
S lu d g e trea tm en t p la n t is u s ed .
* 2 : Recycla b le en erg y g en era ted b y th e crea tu res
Exhaust gas
water heater
Digester
4 12,000㎥ tanks
Warm water
supplied
(1) deduction of electric bill
Treated water supplied
Incinerator
waste heat
Warm water supplied
Main
entrance
※Water reclamation centers
Dehydrator
Digester
Thickener
Digested gas
太陽光発電設備（建設中
Solar Power Plant
）
Sludge thickening
tank
Digester
We treat wastewater and
discharge cleaned water, to
carefully protect the water
quality of rivers and the
sea. We also r ec y cle tr eat
ed w a t er and sludge, and
utilize unused energy, as
we work to build a recycling
city.
Sludge is dewatered and incinerated.
sludge
Wastewater
treatment facilities
A2 O process
Sludge treatment
facilities
Storage tank in wet
weather
Above-ground park space
(Morigasaki Park)
Protecting the Global
Environment
Smoke extraction
tower
Sludge Treatment Facilities
Gas engine
3,200kW
Heating oil
water heater
Electricity supply when blackout
No.3
Digested gas
water heater
Gas holder
Digested gas supplied
Southern
Sludge Plant
4 2,000kW
Sodium-sulfur
batteries
(2) Biomass energy applied
Gas turbine
generator
(for regular use/
emergency)
1,840kW (digested gas)
2,750kW (kerosene)
(3) Securing multiple power source
Showajima
station
.
Generating business uses methane gas
- First introduction of PFI
as domestic sewerage works -
discharging
outlet
Sodiumsulfur
battery
Generator room
Treate d wate r is chl orinated to remove E coil and
other bacteria before
being released into rivers
and the sea.
▲ Gas-engined generator
No.1
No.2
Gas turbines
generator for
emergency
3,200kW ×2
Regular generating
facilities
*3 : PFI (Private Finance Initiative)
PFI is the method that absorbs private funds, technics and management ability to
public works. Inexpensive power is secured by applying private know -how by PFI at
Morigasaki Water Reclamation Center.
Electric bill is reduced by using the power from the sodium-sulfur battery that is charged in the
nighttime with low power rate. Also we tackle with the power shortage caused by power
demand control.
▲ Sodium-sulfur battery facility