Environmentally-Friendly Products

Environmentally-Friendly Product Development

Priority Development Themes

These are the underlying themes of the METAWATER Group's research and development. We have identified these as priority issues, and aim to contribute to the world.

Click here for our environmental technology adoption track record

Waterworks Technology

Renewal, operation and management of entire water treatment plant (Kawai Purification Plant, Yokohama)
Creating water that is kind to the environment using the power of nature

Solar power generation facility

We installed solar panels on the roof of a service reservoir. By harnessing nature’s energy, power consumption has been reduced by 40% over the previous facility.

Powerless filtration using difference of elevation

Water from the source of the Doshigawa River is treated with a membrane filtration system and fed to the service reservoir without the use of a pump. This system uses the difference in elevation between the water source and the purification plant to achieve powerless filtration.

Ozone/promoted oxidation treatment technology
High-efficiency removal of musty odorous substance caused by algae

Musty odors caused by algae are a problem at water treatment plants that use lakes and marshes near cities as their water sources. To solve this problem, METAWATER developed ozone/promoted oxidation treatment technology.
It removes musty odors more efficiently than traditional ozone treatment, and extends plant life by reducing the burden on activated carbon.

Principle behind ozone/promoted oxidation treatment

The addition of hydrogen peroxide to ozone promotes the formation of hydroxyl radicals (・ OH), which have greater oxidizability than ozone, and increase the decomposition efficiency of difficult-to-decompose substances such as musty odorous substances. Hydrogen peroxide also suppresses the formation of bromate ions, a by-product of ozonation.

Ultraviolet treatment system for water treatment plants using ultraviolet LED (UV-LED)
World's largest treatment capacity and approx. 45,000 hours of extended life achieved

In collaboration with Nikkiso Co., Ltd., Nikkiso Giken Co., Ltd., and SENKO RIKEN CORPORATION, METAWATER developed the world's first ultraviolet treatment system for water treatment plants using world top-class, high-output UV-LEDs for the light source.
In the water treatment process, inactivation with ultraviolet rays is one of the measures against chlorine-resistant pathogenic microorganisms such as Cryptosporidium. As regulations on mercury have tightened around the world, there has been growing interest in ultraviolet treatment systems using highly safe UV-LEDs.
By controlling the output of the UV-LEDs and optimizing irradiation, this system offers a lifespan around three times longer than ultraviolet mercury lamps, and is mercury-free, highly safe, and contributes to reducing environmental impact.

Wastewater System Technology

Fluidized turbine incineration system (simple provision type joint research with Tokyo Bureau of Sewerage)
Ecological incineration using turbines driven by waste heat

When sewage sludge is incinerated, blowers that feed air into the furnace consume a significant amount of electricity. METAWATER has developed an incineration system that uses a turbine driven by waste heat instead of a blower, without using power. This system consumes approximately 40% less power than conventional systems.

Sludge fuel conversion project (Kosai Purification Center, Shiga Pref.)
Recycling sewage sludge as carbide

Sewage sludge is incinerated, and the remaining incinerated ash is treated as industrial waste, but by carbonizing sewage sludge, biomass fuel is produced, and this is used as an energy resource in power plants and steel plants.
Compared with conventional incineration and melting facilities, this has reduced CO2 emissions by approximately 11,651 tons per year (equivalent to approx. 3,800 households).

Construction and operation of sludge treatment facilities (Toyokawa Purification Center, Aichi Pref.)
Power generation using sewage sludge

Electricity is generated using biogas (methane) produced as a by-product of the sewage sludge treatment process. By utilizing the FIT (Feed-in Tariff) system, METAWATER aims to reduce sludge treatment costs and reduce greenhouse gas emissions.

Low water content sludge dehydrator
Low dehydrated sludge moisture content realized

With conventional 1-liquid and 2-liquid sludge dewatering, there were issues with moisture content and treatment cost. The post-injection 2-liquid belt press dehydrator developed by the METAWATER Group retains the advantages of the conventional 2-liquid type, while also making it possible to reduce moisture content with less chemical injection.

Recycling Technology

Waste sorting machine
Reduced operation and running costs with high-precision garbage sorting

In order to reduce environmental impact and recycle incombustible garbage, we select recyclable materials such as plastics and PET bottles. The sorting of garbage is generally carried out by human hand, but the METAWATER Group's waste sorting machine is not only capable of highly precise sorting, but also saves on labor and reduces costs.

Reduced operation and running costs life cycle costs

METAWATER’s waste sorting machine is capable of sorting incombustible garbage into "heavy" incombustible garbage, "lightweight" combustible garbage, and fine "fine grain substance" garbage. This reduces the workload involved in manual sorting and saves labor, thereby reducing operating costs.
● 10% to 30% number of workers performing manual sorting

Outstanding benefits for sorting of plastic containers and packaging

Rejects and foreign material such as metal are not permitted when plastic containers and packaging are recycled. Since metals and other materials are automatically separated into heavy materials by the waste sorting machine, they can be easily detected and reliably removed during manual sorting.

Enabling highly precise sorting

A waste sorting machine is installed before the manual waste sorting process to remove filmy and sheet-like combustible materials that hinder manual sorting. This prevents specific materials being overlooked during manual sorting, enabling precise and reliable selection.

Sorting mechanism