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Kobe is the 7th-largest city in Japan with a population of approximately 1.52 million people as of 2019.
In Kobe city, domestic wastewater is treated through the public sewerage system and six WWTPs, which serve 98.7% of the population [over 1.52 million residents as of end of fiscal year (FY) 2019].
Following the establishment of the Act on Construction of Kobe as an International Port City in 1950, the construction of Kobe's first sewerage project began in 1951. During the period of high economic growth in 1960s, Japan experienced some serious environmental pollution problems. To preserve water environments and implement fundamental solutions to exacerbating water pollution, the Water Pollution Control Law was enacted, and the Sewerage Law was revised in 1970.
In Kobe, we focused on investing in sewerage construction in 1970s, aiming for 100% installation rate of flush toilets.
|1951||Modern sewerage projects began
Constructed separate sewerage system (in which sanitary sewage and stormwater are collected in separated sewers)
|1958||The first modern sewerage treatment plant in Kobe begins operation （CHUBU STP）|
|1970||Focused investment for sewerage construction|
|1990||Water reuse projects began|
|1995||Great Hanshin-Awaji Earthquake (Higashinada STP was closed)|
|2001||Reclaimed wastewater supply began|
|2008||Automobile fuel project using KOBE Biogas began|
|2010||Kobe Biogas injected into city gas mains
International contribution project began
|2011||Sewerage network system began operation|
|2012||KOBE designated as "Water environment solution Hub"|
|2013||Digestive sludge phosphorus recovery verification project began|
Kobe's sewerage has used a "separate sewer system" which use different pipes for rainwater runoff and sanitary sewage, since its beginning, aiming for the effective utilization of resources and the improvement of water environment. Sanitary sewage is sent to water reclamation centers and stormwater is discharged directly to rivers and into the sea.
Generally, all treatment plants and pumping stations are built on sites near the coasts.
|Sewers||Sewers transport sewage to waste water treatment centers. They are also referred to as "Sewer pipes".|
|Pumping Stations||Pumping stations are used in bringing sewage to the waste water treatment plant.|
|6 Wastewater Treatment Plants (WWTP)||Waste water treatment plants have two major functions, treatment of sewage and sludge generated as a result of the treatment of sewage.|
Various usages of Resources obtained from sewage
Treated water, sludge and heat energy are produced by sewage treatment plants.
Our promotion of effective utilization of these resources helps to control the production of greenhouse gas, and contributes to an environmentally friendly city that effectively utilize waste products.
25 Years after the Great Hanshin-Awaji Earthquake
|Vehicle fuel||City gas pipe injection|
Filling volume:2,700 m3 per day
Number of units:7,115 units
|City gas production facility
Injection quantity: 1,070,000 m3 per year (Equivalent to 2,000 households)
|Co-power-generation||Use of local biomass for sludge treatment
efficiency improvement and biogas increase
|Power generation by digestion gas
Power generation volume: 10,000 m3 per day
|Facility accepting biomass|
In Kobe, reusing of treated wastewater for water trucks, landscaping, car washing or flushing toilets is widely used. Water reuse can be an option for making a contribution to Low Carbon Society.
Use of Recycled Water
|Car Washing||Flushing toilets|
Water works and sewage facilities have been affected heavily by the earthquake. In particular, the largest wastewater treatment plant 'Higashinada WWTP' completely hadn’t woked for 100 days.
>>read more（Challenges after Disaster）
Based on lessons from the Great Hanshin-Awaji Earthquake, the city connected 4 treatment plants via deep underground large-diameter shielded pipes (total length: approx. 33 km). This forms a sewerage network system that will continue to operate even during a disaster.
>>read more（Sewerage Network System）