Taking on the Challenges of Achieving a Circular Economy through Business

In addition to promoting waste reduction and recycling, the Sanki Engineering Group strives to contribute to achieving a zero-waste society through our business activities. Since fiscal 2023, we have participated in the Circular Partners program led by Japan's Ministry of Economy, Trade and Industry and are applying the Group's unique technological capabilities to further bolster our efforts.
In terms of sewerage, we are conducting research and development on the effective use of sewage sludge as a recyclable biomass resource, including the conversion of incinerated ash from sewage sludge into fertilizer^*1 and the conversion of sewage sludge into fertilizer and feed^*2 using insects, each of which has been adopted as a project by Japan's Ministry of Land, Infrastructure, Transport and Tourism (MLIT). Regarding the conversion of incinerated ash from sewage sludge into fertilizer, we aim to register such fertilizer and implement it in society in fiscal 2025 through the project. Through these efforts, we will contribute to the effective use of waste and the promotion of resource recycling.

*1

Research project on low-cost technology for converting incineration ash from sewage sludge into fertilizer was selected for a feasibility study for the FY2022 Breakthrough by Dynamic Approach in Sewage High Technology Project by MLIT.

*2

Research project on the conversion of sewage sludge into feed and fertilizer using insects was selected for the FY2023 Applied Research on Sewage Project by the MLIT.

Current State of Industrial Waste

With respect to industrial waste discharged at our construction sites, we seek to understand the current status by compiling data on waste discharged at sites where Sanki Engineering Group is the prime contractor.
We have maintained the recycling rate for industrial waste, excluding waste disposed at final landfill sites, at 86.3% (non-consolidated) and 86.9% (consolidated) in fiscal 2023. We will continue to promote proper disposal by monitoring and analyzing the discharge of industrial waste. In fiscal 2023, our waste disposal cost was 387,186,000 yen (non-consolidated) and 420,529,000 yen (consolidated). Furthermore, we have been properly disposing waste CFC and halons, the cost of which was 21,934,000 yen (nonconsolidated) and 31,110,000 yen (consolidated) in fiscal 2023.
With the aim of ensuring the proper disposal of industrial waste, we have made digital manifests available to all departments for waste management. The rate of introduction of digital manifests was 98.9% on a non-consolidated basis and 98.1% on a consolidated basis in fiscal 2023.
We work to reduce emissions of waste plastics and promote the recycling of plastics in accordance with the Plastic Resource Circulation Act.

Changes in the Amount of Industrial Waste Discharged

Scope:
Industrial waste discharged at sites where Sanki Engineering is the prime contractor and at domestic Group companies
Recycling rate: Sanki Engineering Co., Ltd.

*

Industrial waste emissions increased in fiscal 2022 due to the impact of large construction projects that involved demolition.

Proper Disposal of Hazardous Substances

We properly dispose of hazardous substances in accordance with the laws and regulations while informing our employees about proper methods of managing these substances. We have created and distributed posters to inform them of the revisions in storage and disposal procedures for mercury-laced waste in accordance with the revision of the Waste Management and Public Cleansing Act. Regarding asbestos, we prepared a flow chart that is being used by site staff to ensure proper disposal of asbestos at construction sites for renovation work. Also, in accordance with the Air Pollution Control Law, we will properly report the presence or absence of asbestos-containing building materials at construction sites during demolition and renovation work.

Limiting Water Use

At facilities owned by the Sanki Engineering Group, we regularly monitor water use and continuously consider ways to improve the efficient use of our water resources to reduce usage, which also includes making capital investments with due consideration for water conservation. Most of the water used is potable and for offices and training accommodations. The Sanki Techno Center and Yamato Product Center are making efforts to use less tap water by combining it with well water.

Water Use

(m³)

Scope:
Eight sites including the Sanki Techno Center, Sanki Yamato Building, Yamato Product Center, Nasu Techno Station, and field offices

Water use has been recalculated to include the usage of tenants in owned facilities for which we provide overall management.