Intermediate Treatment of Industrial Waste

Toward 100% Resource Recycling

At Ishizaka Inc., we perform intermediate treatment of industrial waste to regenerate it as valuable resources. By combining our patented equipment designs with meticulous manual sorting performed by our skilled staff, we achieve highly precise separation and classification — even for waste streams traditionally deemed difficult to recycle. Through continuous research and development, we have achieved an industry-leading volume reduction and resource recovery rate of 98%.

No matter the waste, we are committed to transforming it back into valuable resources. We will never stop challenging ourselves on the path toward 100% resource recycling.

Solutions Provided by Ishizaka Inc.

Intermediate Treatment of Industrial Waste

Acceptable Waste Types Include:
We accept seven categories of industrial waste, including mixed construction debris that contains rubble, wood waste, metal scraps, and more. Ishizaka Inc. holds permits from numerous local governments for the collection and transportation of industrial waste, and we handle everything from collection and transport to transfer, storage, and treatment.

Paper waste

Wood waste

Glass, concrete, and ceramic waste
Asbestos-Containing Industrial Waste (Transfer and Storage)

Rubble
Asbestos-Containing Industrial Waste (Transfer and Storage)

Metal scraps

Plastic waste
Asbestos-Containing Industrial Waste (Transfer and Storage)

Textile waste (limited to tatami mats)

End-of-Life Solar Panel Recycling

We have newly established a dedicated recycling plant for end-of-life solar panels (“Solar Panel Resource Recovery Facility”), which began accepting panels on June 2, 2025. As renewable energy adoption accelerates globally, we are advancing the recycling of solar panels that reach the end of their lifecycle after 20–30 years, creating new value and advancing technical capabilities.

Ishizaka Inc. opens new “Photovoltaic Recycling Plant” in Iruma City, Saitama Prefecture

Environmental Analysis

We operate research facilities in partnership with affiliated companies to conduct asbestos and soil analyses. These environmental and safety checks are part of our comprehensive approach prior to resource recovery, including investigations of excavation soil, underground objects, and asbestos content.

Technology and Process for High Resource Recovery Rates

Key Treatment Steps

Our multi-stage treatment process combines careful manual sorting with original equipment that utilizes wind, density differences, and more to achieve precise classification. By honing our technology and maintaining high quality standards, we have achieved a 98% rate of volume reduction and recycling.

Sorting

Waste transported by truck is unloaded and roughly sorted to identify materials suitable for separation and resource recovery. This process is carried out using heavy machinery and manual work by staff.

Crushing

Composite construction materials are decomposed and adjusted to the appropriate particle size using a crusher for subsequent sorting.

Disassembly and Separation

Using magnetic heavy machinery and manual work by staff, ferrous and non-ferrous materials are finely separated. In addition, unitized housing construction materials are dismantled to separate them by material type.

Screening

Waste is classified by particle size using screening equipment, similar to a sieve. Depending on the type of waste, materials pass through the screening process multiple times to achieve higher sorting accuracy.

Manual Sorting

Mixed waste is manually sorted by material type. Even the smallest pieces are carefully sorted so they can be recovered as resources.

Magnetic Separation

Magnets are used to remove ferrous scrap from waste as it moves along the conveyor belt. The separated metal waste is sent to the Valuable Materials Plant, where it is recycled.

Air Separation

Air flow is used to classify waste by weight. By making particle size uniform, materials can then be separated by type.

All-Weather Plant Facilities

All business plants are consolidated into an independent, all-weather integrated plant, enabling a fully consistent process from waste treatment to resource recycling.
Each plant is designed as a fully indoor facility, allowing equipment and heavy machinery to operate stably at all times.
In a safe working environment unaffected by weather conditions, every employee is able to demonstrate a high level of technical expertise.

Waste Concrete Recycling Plant

Waste Plastic Plant / Volume Reduction Plant

Sorting and Grading Plant

Chipping Plant

Valuable Materials Plant

Use of Renewable Energy

Along with the introduction of cutting-edge energy-saving technologies, we are promoting a shift to renewable energy and working to build an energy circulation system centered on the satoyama landscape. In 2021, we achieved 100% renewable electricity usage for all power consumed at our headquarters and plants.

Ishizaka Inc. fully adopts renewable energy electricity and achieves 100% renewable energy

For more details on our use of renewable energy, click here.

Collaboration

Introduction of Smart Plant Technologies

To circulate all types of waste as resources, we work hand in hand with a wide range of companies to introduce cutting-edge technologies and take on the challenge of realizing smart plants.

Three-Company Collaboration Toward Realizing Smart Plants / NEC Corporation / Intel Corporation

The collaboration began in July 2020.By utilizing network technologies such as AI and local 5G, the initiative promotes solutions to labor shortages within the plant and the creation of a safe and secure working environment. To date, the collaboration has taken on the challenge of developing technologies such as the automatic measurement of waste volume delivered by trucks using laser sensors.

Joint Development of a Waste Sorting Robot / Tokyu Construction Co., Ltd.

Based on waste sorting technologies researched and developed by Tokyu Construction, we jointly developed a “waste sorting robot” that automatically sorts construction waste using deep-learning–based image analysis technology. In April 2021, the robot was introduced into the manual sorting line. We will continue to advance these efforts with the aim of further technological enhancement.

Effective Use of Energy

To make effective use of the various forms of energy generated through waste treatment, we are working in collaboration with related organizations and advancing research and development initiatives.

Development of an IoT-Based Vibration and Noise Waveform Measurement Device and Monitoring System / Gunma Industrial Technology Center

We jointly developed an IoT device that measures the frequency of noise and vibration generated by crushers and screening equipment installed within the plant, along with a monitoring system that determines whether waveform patterns are normal or abnormal.Through this collaborative research, we are working to prevent plant-related issues before they occur. The system has currently been implemented, and its effectiveness is being verified, with the goal of future practical application and commercialization.