Cambi will improve solids treatment in Hawaii

Asker, Norway, 28 January 2024, 10:01 CET

Cambi has signed a major contract to supply a thermal hydrolysis process (THP) system to the City and County of Honolulu’s Department of Environmental Services at the Honouliuli wastewater treatment plant.

Honouliuli is Oahu’s second-largest wastewater treatment plant, with a design capacity to process 51 million gallons or 193,000 m3 of wastewater per day. The plant has been modernised with a secondary treatment step before deep ocean outfall and is now investing in modern thermal hydrolysis solids treatment before anaerobic digestion.

Thermal hydrolysis from Cambi will increase the solids processing capacity for the existing digesters and accommodate the increasing solids volumes arising from the introduction of secondary treatment without the need to build two new digesters. The THP will also significantly increase biogas production and produce dryer biosolids, providing volume reduction.

“Cambi is proud to be entrusted with this important project to improve the economics and environmental footprint of solids treatment in Oahu. We look forward to a fruitful cooperation with main contractor Hensel Phelps and the Department of Environmental Services in the coming years to bring thermal hydrolysis to Hawaii on time and budget,” said Cambi acting CEO Lars-Petter Traa.

The project is Cambi’s 12th in the US. The THP system will be delivered to the site in 2026, with operations scheduled to start in 2027.


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Note on contract value






NOK million

15-50 50-100 100-200 >200

Contract value


About Cambi:

Cambi is a global biogas technology and solutions supplier for wastewater treatment plants and anaerobic digestion facilities. Since 1992, Cambi has retained market leadership through continuous innovation and a robust portfolio of proven and patented technologies. With strong project delivery and customer support capabilities, the company has delivered many well-performing installations in 27 countries on six continents.

Cambi’s thermal hydrolysis process increases renewable energy output, reduces operational costs, and minimises greenhouse gas emissions. It is suitable for all biosolids outlets, including land application and thermal processes such as drying, pyrolysis, and incineration. Thermal hydrolysis is compatible with all sludge and waste treatment regulations and easy to integrate at new and existing anaerobic digestion sites.

Cambi is listed on Euronext Growth Oslo, a multilateral trading facility in Euronext, Europe’s largest stock exchange platform. Find out more at



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