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Technology of Osaka City

Cutting edge of waterworks

Ensure purer and safer tap water

In December 2008, the Osaka City Waterworks Bureau became the world's first public water service provider to gain ISO 22000, an international standard for food safety management.
ISO 22000 uses a safety management approach called HACCP (Hazard Analysis and Critical Control Point). By controlling critical control points under the ISO management system and making continual improvements, food safety can be managed.

Ensure purer and safer tap water

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Advanced Water Treatment System

The Advanced Water Treatment System is applied in Osaka city. Conventional water treatment system uses coagulo-sedimentation basins as well as rapid sand filters. In order to improve drinking water quality, ozone contact basins and granular activated carbon filters are used for further treatment. It removes musty odors and reduces trihalomethanes.

Advanced Water Treatment System

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Water distribution management

In order to realize more efficient water distribution on a daily basis as well as prompt distribution operation in emergency situations, Osaka City has promoted centralized management of purification plants and pumping stations in the city through a distribution control room located in Kunijima purification plant general administration building. In addition, the city has established the distribution information center that enables monitoring of water distribution in the whole area through the distribution information system along with distribution telemeters that are installed in the distribution pipes in the whole city. The city operates these facilities in a coordinated manner, managing city-wide water control.
The centralized management system remotely controls distribution pumping facilities at total of 10 sites for water supply and industrial water service including four distribution pump sites in Kunijima purification plant and six purification plants/water distribution plants/pumping stations in the city for 24 hours a day.

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Water distribution management

Cutting edge of sewerage system

Recycling of sewage sludge

Recently, Osaka city has started a new project that utilizes sewage sludge as an energy resource. Figure 1 shows effective energy recovery in a sewage treatment plant. First, electric power is generated using the digestion gas from the sewage treatment process and the generated power is used for sewage treatment.
Furthermore, the heat from the power generation process is used to promote digestion gas generation. Therefore, effective use of the sewage sludge leads to an effective treatment system which reduces the sewage treatment cost and CO2 emission at the same time.

Recycle of sewage sludge
Figure 1. Effective energy recovery in a sewage treatment plant

Combined sewer overflow control

The first sewerage system in Osaka city, was a combined sewer system, which flows stormwater and wastewater in the same pipe. This system was applied in order to reduce both the cost and term of construction so that it could become operational rapidly and widely. However, a combined sewer system has problems that occur especially in wet weather in which wastewater exceeding the treatment capacity is discharged directly and pollutes rivers. Therefore, we have been developing a sewage treatment method that has countermeasures against heavy rain and does not pollute rivers. Figure 2 shows the method for treating wastewater in wet weather to prevent direct discharge to rivers.

Combined Sewer Overflow Control
Figure 2. Method for treating wastewater in wet weather

Cutting edge of solid waste management

Waste incineration plant employing cutting-edge environmental technology

environmental technology 01

Osaka City's waste product power generation system

environmental technology 02

Technology of Kansai Region

The following links contain information about water/environmental related issues published by both the public and private sectors mainly in the Kansai region.


Joint research