Rhinoflux and Swing start sewage sludge-to-power trial in Japan

Rhinoflux and Swing Corporation have begun a proof-of-concept trial in Japan to test Hydro Chemical Looping on sewage sludge from treatment plants. The project aims to generate power and capture more than 99.9% pure CO2 without combustion, potentially lowering sludge disposal costs and opening new revenue streams for wastewater operators.

Why it matters: - Japan generates about 2.34 million dry solids tons of sewage sludge a year, creating a persistent disposal and emissions challenge for municipalities and water utilities. - The trial targets a non-combustion route to turn sludge into electricity and high-purity CO2, which could reduce treatment costs, lower transport and disposal burdens, and improve energy resilience at sewage plants. - The captured biomass CO2 could potentially be sold as liquefied CO2 or used to generate carbon dioxide removal credits.

What happened: - Rhinoflux Inc. and Swing Corporation launched a proof-of-concept trial in Japan to test Hydro Chemical Looping on sewage sludge produced at sewage treatment facilities. - The demonstration began in July 2026 and follows a feasibility study that found HCL potentially applicable and commercially viable for sewage sludge. - Rhinoflux is a Kyoto University spinout developing distributed biomass power generation and CO2 capture technology. - Swing is a Japanese water treatment company with engineering, construction, operation and maintenance services across water and sewage infrastructure.

The details: - The trial will combine Swing’s sludge and water treatment expertise with Rhinoflux’s HCL system to collect data for future deployment in sewage treatment facilities. - HCL generates electricity through chemical reactions in an aqueous solution instead of combustion. - The process simultaneously separates and captures CO2 with a purity of over 99.9%. - Rhinoflux says the technology could deliver about two to four times higher power generation efficiency than conventional biomass systems. - The aqueous process is designed for high-moisture biomass, including sewage sludge, which has been difficult to use economically. - Japan’s current sludge management methods include landfilling, incineration, solid fuel production, anaerobic digestion for biogas and use in construction materials such as cement. - Those methods still face environmental and cost challenges, especially where combustion is required for power generation from solid fuels or methane gas.

Between the lines: - The pilot is as much about proving operational fit as it is about technical performance. - If HCL works at sewage plants, the model could shift sludge from a disposal problem into a local energy and carbon feedstock. - The project also points to a broader market for technologies that can handle wet biomass streams that are usually uneconomic to burn or process.

What's next: - Rhinoflux and Swing will gather practical data during the trial to assess requirements for broader sewage sludge resource utilization. - The companies are evaluating how the system could be deployed in sewage treatment infrastructure after the PoC. - Rhinoflux says it aims to commercialize distributed power generation and CO2 capture for other hard-to-use biomass sources, including food residues and woody biomass.

The bottom line: - The PoC is a test of whether sewage sludge can become a cleaner, higher-value local power source without combustion.