Transforming Wastewater into Clean Hydrogen Energy
Unlock Clean Energy & Circular Economy Value.
Download our industry whitepapers to explore how ammonia recovery and electrolysis are turning wastewater into a low-carbon hydrogen fuel source.
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Ammonia pollution in wastewater is no longer a challenge—it’s an opportunity. Discover how Organics’ OTAR® technology captures and converts ammonia into clean hydrogen, all while reducing treatment costs, avoiding emissions, and generating new revenue.
What is OTAR® and How Does It Work?
OTAR® (Organics Thermal Ammonia Recovery) is a patented technology that captures ammonia from wastewater using thermal energy—often sourced from low-grade or waste heat in nearby operations—without chemical additives or pH adjustment.
The recovered ammonia is absorbed into water to produce ammonium hydroxide (NH₄OH), which is then fed into a low-voltage electrolysis system. Here, ammonia is oxidized at the anode to produce nitrogen, while hydrogen is produced at the cathode. This process consumes up to 27% less electricity than conventional water electrolysis in commercial settings—and up to 90% less in theory—with no NOx emissions and only nitrogen and hydrogen as byproducts.
Unlike traditional wastewater treatment that relies on energy-intensive biological nitrification (often producing nitrous oxide, a GHG 300× more potent than CO₂), OTAR® offers a chemical and electrochemical route. This approach recovers rather than removes ammonia, aligning with circular economy principles.
Key Advantages:
Up to 98.5% ammonia recovery in a single thermal pass
Energy savings by eliminating aeration, carbon source dosing, and sludge production
No chemical dosing, except optional anti-foam
Modular, containerised systems for decentralized or large-scale deployment
Seamless integration with anaerobic digesters and existing waste heat sources
Hydrogen generated from recovered ammonia can be:
Used on-site as clean fuel or energy storage
Sold as green hydrogen or chemical feedstock
Integrated into off-grid or decentralized energy systems
If not electrolyzed, ammonium hydroxide can be sold as fertilizer or industrial input, opening another revenue stream.
In carbon-regulated markets, avoided nitrous oxide emissions and low-carbon hydrogen production can qualify for carbon credits, further boosting project ROI.
OTAR® is more than a treatment innovation—it’s a resource recovery and climate solution that:
Cuts emissions from wastewater operations
Supports green hydrogen infrastructure
Enables containerized, decentralized deployments
Is resilient to temperature, pH, and microbial fluctuations
A 2,000 m³/day plant with 3,000 mg/L ammonia influent could recover ~1,900 kg of ammonia daily, producing clean hydrogen at a cost 60–80% lower than biological methods and over 50% lower than pH-adjusted thermal stripping.
Challenges to Adoption
Like many emerging technologies, OTAR® adoption may face hurdles such as:
- Initial CAPEX for new installations (though OPEX is low and predictable)
- Integration complexities in facilities without existing heat sources or high ammonia concentrations
With tightening nitrogen discharge limits, rising carbon costs, and increasing demand for green hydrogen, the case for wastewater-derived hydrogen is stronger than ever. To scale its adoption, regulatory support, pilot funding, and awareness within the water-energy-waste nexus are essential.
Conclusion
OTAR® transforms wastewater ammonia from an environmental liability into a clean energy asset. By unlocking the hydrogen potential in waste, it supports sustainability goals, reduces treatment costs and emissions, and opens new economic pathways for utilities, industries, and climate-forward municipalities.
Estimate Your ROI with Ammonia-to-Hydrogen Ballpark Calculator
Curious about the financial benefits of recovering ammonia for clean hydrogen production?
Use our free ballpark calculator to get a quick estimate of your Return on Investment (ROI), payback period, and potential revenue from hydrogen and carbon credits.
