Kasai Water Reclamation Center
Kasai Water Reclamation Center, which is located at the mouth of Arakawa River,consists of facilities in the southern and northern areas that sandwich the Metropolitan Expressway Bayshore Route. Its treatment area is 4,893 ha, including most of Edogawa Ward surrounded by Arakawa River and Edogawa River and a part of Katsushika Ward.
Treated wastewater is discharged into Tokyo Bay (Arakawa River), while some of it is sand-filtered and used for washing/cooling machines and flushing toilets in the Center.
Generated sludge incinerated within the Center together with sludge pumped from Nakagawa Water Reclamaiton Center and Kosuge Water Reclamation Center.
The treatment area has 8 pumping stations, 4 of which are operated remotely from Kasai Water Reclamation Center.
|Operation started||September 1981|
|Wet weather Storage tank||87,300m3|
|Stormwater storage tank||69,000m3|
|Wastewater treatment facilities||Grit chamber||18|
|Primary sedimentation tank||10|
|Secondary sedimentation tank||10|
|Slude treatment facilities||Thickener||4|
Average quality of influent and final effluent
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.
|Item||Influent||Final effluent||Regional water quality standards|
|COD（Mn）||76||10||35 or bellow|
|Total nitrogen||27.1||10.6||30 or bellow|
|Total phosphorus||3.1||0.9||3 or bellow|
※ 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.
The sewerage system is principally made up of 3 facilities.
Sewers, which collect and carry sewage.
Pumping stations, where sewage is pumped up so that the sewers do not get too deep.
Water reclamation centers, where sewage is treated to be clean water.
Inspections, cleaning, and repairs are done daily in order to make sure each of these facilities works properly.
The Role of Tokyo Sewerage
Improvement of Living Environment through Wastewater Treatment
Wastewater discharged from homes and factories is treated to ensure a comfortable living environment.
Preventing Flooding through the Removal of Stormwater
The city is protected from flooding through the speedy drainage of stormwater which falls on land surface.
Protecting the Global Environment
We treat sewage and release cleaned water, to carefully protect the water quality of rivers and the sea. We also recycle treated water and sludge, and utilize unused energy, as we work to build a recycling city.
Features of Kasai Water Reclamation Center
Photovoltaic (Solar) Power Generation
To help prevent global warming, a photovoltaic power generation system, which does not emit CO2 at the time of power generation, was installed and the generated power is consumed by the Center as part of its total power consumption.
The total power generation capacity is 490kW, 290kW of which is generated by single-axis tracking type generators.The annual power production is equivalent to the power consumed by 160 ordinary households.
Nas (sodium-sulfur) Battery
We reduce the electricity bill by using power in the daytime that was saved in the sodium-sulffur battery in the nighttime with low power rate.
Also we trckle with the power shortage caused by power demand control.
Small-scale Hydroelectric Power Generator
The outfall for the treated water is installed several meters higher than the sea level to protect it against high tides. Hydraulic power is generated by utilizing this effluent drop.
The output of the generator is 27kW, and the annual power generation is equivalent to the power consumed by over 20 ordinary households. As power is generated without emitting CO2, hydroelectric power genration mitigates global warming.
Seafront Ballpark on top of the Treatment Facilities
The Edogawa Ward seafront ballpark, which has been built on the space above the treatment facilities, is used by many people to play soccer, baseball, etc. The ballpark can be turned into an evacuation area in case of an earthquake disaster.
Application for use: Edogawa Ward Seafront Ballpark
We are promoting multi-purpose use of sewerage facilities: the square is used as a square for events and visiting kids.
Turbocharged Fluidized Bed Incinerator
We introduce efficient incinerator such as high-temperature energy-saving type incinerator and reduce energy consumption and N₂O gas emission.
To commemorate the 20th anniversary of the Center, local elementary school students were asked to create designs for the smoke stack. The old smoke stack, which was painted red and white, was reborn in 2001 with a fresh blue gradation.
1-1-1, Rinkai-cho, Edogawa Ward, Tokyo 134-0086 MAP
|Access||Get off Nishi Kasai Station on the Tokyo Metro subway, take a metropolitan bus bound for "Rinkai-cho 2-chome Housing Complex," get off at "Tokyo Rinkai-Hospit" or "Rinkai-cho-1-chome," and walk for 10 minutes to the Reclamation Center.
Get off at Kasai Rinkai Park Station on the JR keiyo Line and walk for 20 minutes to the Reclamation Center.
Tokyo Sewerage Museum "Rainbow"
There is a facility to enjoy the experience of learning about the sewerage system, its roles, and the importance of water environment.
- Hours nine half o'clock to sixteen half
- Entry Fee Free
- Closed Mondays（open on holiday Mondays, closed the next day）and the New Year's season
Open daily throughout the summer（July 16 - August 31）
Open on Sewerage Day（September 10）and Tokyo Citizens Day（October 1）
- Address 2-3-5 Ariake, Koto-ku Ariake Water Reclamation Center Management office（A-tower）5th floor
- Telephone 03-5564-2458
- Website Tokyo Sewerage Museum "Rainbow"
Bureau of Sewerage in Tokyo website
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.
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 croocked 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.
Facility tours of Water Reclamation Centers
Facility tours of water reclamation centers are available except weekends, holidays, and the New Year's season.
Please contact us about reservations and details.
Hours 9AM～5PM（weekdays only）