Tokyo selects Rhinoflux for sewage sludge power demo

Rhinoflux has been chosen by the Tokyo Metropolitan Government for an 18-month field demonstration of a combustion-free system that turns wet sewage sludge into electricity and high-purity CO2. The project could help utilities cut drying costs, reduce landfill use and create new revenue from waste streams that are now hard to monetize.

Why it matters: - Sewage sludge is one of the biggest untreated energy resources in municipal systems, but its high moisture content makes conventional energy recovery expensive. - The Tokyo demonstration could show whether wet sludge can be converted into power and CO2 without the drying and combustion steps that limit today’s economics. - If the technology scales, wastewater utilities could reduce disposal costs and create new value from a feedstock that is generated continuously.

What happened: - Rhinoflux Inc. was selected by the Tokyo Metropolitan Government for its Resource & Energy Resilience Program under the SusHi Tech Global initiative. - The 18-month on-site demonstration begins in November 2026 at a large-scale sewage treatment facility in Japan. - The project is being run with the municipality that operates the plant and a major Japanese water treatment equipment manufacturer. - Rhinoflux is a Kyoto University spinout developing combustion-free biomass power technology.

The details: - The company’s Hydro Chemical Looping process generates electricity through chemical reactions in an aqueous solution rather than by burning biomass. - The system accepts feedstock in wet form, so no drying stage is required. - Rhinoflux says the technology delivers generation efficiency of about two to four times conventional biomass power systems. - The process produces CO2 at 99.9%+ purity as an inherent output, without additional purification equipment. - The smaller footprint comes from eliminating the drying area normally needed for biomass systems. - Captured CO2 can be liquefied for industrial gas markets or used for BECCS carbon credits when permanent storage is involved. - The technology also applies to food and beverage processing residues, industrial wastewater sludge, agricultural residues, forest thinnings and energy crops. - In Japan, about 2.34 million dry-solid tons of sewage sludge are generated each year, according to the Ministry of Land, Infrastructure, Transport and Tourism. - Japan’s sewage sludge recycling rate is about 76%, but energy recovery is only around 10% and 23% still goes to landfill. - The sewage sector emits about 3.38 million tons of CO2 equivalent annually, making it the largest single source of greenhouse gas emissions from municipal operations in Japan. - Similar economics affect utilities in Europe, North America and Asia, where landfill regulation and disposal costs are rising.

Between the lines: - Public procurement often requires proven operating history before municipalities can specify new equipment, which makes first-of-a-kind infrastructure technologies hard to adopt. - The Tokyo-backed trial is designed to generate the performance and operating evidence municipalities need to buy the system later. - The project also tests whether the technology can move from a waste-treatment concept to a domestic energy and carbon resource. - Alex Mazawa, Rhinoflux CEO, said field proof of interface with existing equipment, safety, and long-term operation and maintenance is essential for adoption in public infrastructure. - Mazawa said sewage sludge should be redefined from a disposal problem into a domestic energy and carbon resource.

What's next: - The demonstration will run for a cumulative 2,400 hours of continuous operation. - Rhinoflux will test primary sludge, digested sludge and dewatered cake during the trial. - The program will measure power output, CO2 recovery, sludge volume reduction, operating stability, impurity management, interface conditions with existing plant processes, safety and maintenance requirements. - Rhinoflux says it is following a five-stage development roadmap from lab work to large-scale projects. - The company has already completed laboratory-scale continuous operation on multiple feedstocks with water treatment equipment manufacturers and industrial biomass producers. - Rhinoflux expects first commercial systems for municipal and industrial customers from 2028 onward. - The company expects large-scale projects serving data centers, steel, chemicals and utilities in 2032 and beyond. - Rhinoflux is finalizing a Series A financing round to fund commercial engineering, deployment and team expansion, with details due at closing. - The company was founded in April 2024 and is headquartered in Kyoto, Japan. - More information is available in the Tokyo program announcement and the company’s website.

The bottom line: - Tokyo is giving Rhinoflux a high-stakes public test of a technology that could make wet sludge a usable energy source instead of a costly waste stream.