Blockchain-Based End-to-End Documentation of Sludge Traceability in the Circular Economy
Sector: Tertiary sector · Industry: Waste management and recycling · Organisation: Suez · Maturity level: Production
Water and waste management group Suez uses its proprietary blockchain platform CircularChain to digitally and immutably record every stage of sludge transfer from wastewater treatment to agricultural land. This end-to-end documentation across the entire organic matter value chain increases transparency in the recycling process and ensures compliance with regulatory requirements. CircularChain was launched in September 2020 and is in operational use.
Documentation status
- Project status: Production
- Evidence: Evidence medium
- Editorial review: Ufuk Avci, 12 July 2026
Description
Sewage sludge generated during wastewater treatment contains valuable nutrients and can be used as fertiliser in agriculture – this route from the point of origin to soil application is called the sludge pathway. Suez has developed its own blockchain platform, CircularChain, which digitally and immutably documents every step of this pathway, allowing traceability at any time of where the material came from and where it has gone. The solution was officially launched in September 2020 and is in operational use. Blockchain technology ensures all recorded data is tamper-proof, facilitating both internal quality assurance and compliance with regulatory proof obligations.
The disposal and recycling of sewage sludge is strictly regulated in many countries, as the material contains valuable organic substances but may also contain pollutants. Suez, one of the world’s leading companies in water and waste management, has developed CircularChain, a blockchain-based traceability platform specifically designed to track organic residual materials and fertilisers along the entire value chain. The platform provides reporting on all transactions of wastewater treatment plants and covers the entire journey from production of organic residuals to their return to the soil. By using secure information storage and transmission technology, traceability of fertiliser materials is improved and all processes are recorded immutably. CircularChain was launched by Suez on 22 September 2020 and positions the solution as a contribution to the agricultural transition and promotion of sustainable food production within the circular economy. Concrete figures on cost savings, time savings, or quantifiable ROI have not been published in available sources.
Perspectives
B2B — organisations perspective
For companies in waste management, water management, and agriculture, CircularChain offers a transparent, audit-proof record of the entire journey of organic residual materials, simplifying collaboration with authorities and business partners. Automated documentation based on blockchain reduces administrative effort in reporting and creates a shared, trustworthy data basis for all actors involved along the value chain.
Employees perspective
Employees in wastewater treatment plants and waste management benefit from a digitised documentation infrastructure that replaces manual recording processes and simplifies proof obligations towards authorities. At the same time, working with a blockchain-based platform requires new digital skills and adjustments to operational procedures.
Benefits
General
- Seamless and tamper-proof documentation of the entire journey of sewage sludge from the treatment plant to agricultural soil application
- Improved traceability of fertiliser materials along the entire organic value chain
- Simplified proof of compliance with regulatory requirements through automated, audit-proof reporting
- Strengthening trust between waste management companies, agriculture, and authorities through transparent data
B2B — organisations
- Reduction of administrative effort in documentation and regulatory reporting
- Competitive advantage through demonstrable compliance and transparency towards clients and regulators
- Support for strategic positioning as a sustainable company in the circular economy
Employees
- Digitisation and automation of manual documentation processes in wastewater treatment plants
- Clearer process responsibilities through immutable digital records
Challenges
General
- Complete data quality depends on consistent and correct input by all actors involved along the sludge pathway.
- Technical integration of a blockchain platform into existing operational systems of wastewater treatment plants requires adaptation effort.
- Specific challenges in the Suez project have not been publicly disclosed in available sources.
B2B — organisations
- Involving all relevant partners and service providers along the value chain in the platform may require organisational effort.
- Lack of standardisation in the industry can hinder interoperability with other systems.
Employees
- Employees require training and new digital skills to work with the blockchain platform.
Technology foundation
Suez uses a proprietary blockchain platform called CircularChain, designed as a dedicated traceability solution for organic residual materials and fertilisers along the entire value chain. The platform uses secure data storage and transmission to document all transactions from wastewater treatment plants in a tamper-resistant manner. The specific blockchain technology stack used is not specified in the available sources. The characteristics of blockchain – immutability, transparency, and decentralized verification – make the technology particularly suitable for seamless proof of regulatory-relevant material flows such as sewage sludge.
Implementation examples
CircularChain – blockchain traceability for organic residual materials
Sewage sludge from wastewater treatment must be documented seamlessly on its way to agricultural application to meet regulatory requirements and prove safe utilisation as fertiliser. Traditional paper-based documentation processes are prone to errors and difficult to transparently demonstrate to authorities and business partners.
In September 2020, Suez introduced its own blockchain platform CircularChain, which documents all transactions of wastewater treatment plants along the entire organic value chain – from the generation of sewage sludge to application on agricultural soils – in a tamper-proof manner. The solution is operational and aims to improve traceability of fertiliser materials and support the agricultural transition.
Suez, one of the world's leading companies in water and waste management, launched CircularChain on 22 September 2020 as a dedicated traceability platform for organic residual materials and fertilisers. The platform provides comprehensive reporting on all transactions of wastewater treatment plants and covers the entire path of organic materials from production to return to the soil. CircularChain uses secure information storage and transmission technology to ensure fully secured and improved traceability of fertiliser materials. Suez positions the solution as a contribution to the circular economy and to promoting sustainable food production within the framework of the agricultural transition. The specific blockchain technology stack underlying the platform and the number of plants or regions where the solution has been rolled out are not specified in the available sources.
CircularChain addresses the problem of lack of tamper-proofing and gaps in the documentation of organic material flows by storing all transactions immutably on the blockchain and making them traceable at any time. This facilitates compliance with regulatory requirements and strengthens the trust of all parties involved in the integrity of the data.
Tags
Circular Economy, Traceability, Sewage Sludge, Compliance, Supply Chain, Sustainability, Digitisation