Onnu CarboFlow Pyrolysis Unit

Onnu Ltd is a UK-registered company (company number 13656501 in its footer) that designs affordable pyrolysis plants for biochar carbon removal. It sells standard, proven equipment packages aimed at maximizing return on investment for biomass owners and project developers.

Its CarboFlow unit processes 850 kg per hour of feedstock, thermally decomposing it into biochar and syngas, with the syngas burned to power the process and drying. The site states payback of about 3 years and about 4 months from purchase to production, and compatibility with the Isometric and Puro.earth registries. Installs listed include Biocarbon Technology Asia in Malaysia, Green Hub UK and a Norway forestry-waste site.

• CarboFlow pyrolysis unit: 850 kg per hour capacity for biomass feedstock.
• Syngas energy recovery: syngas burned to power the process and feedstock drying.
• Fast delivery: about 4 months from purchase to production.
• Registry compatibility: works with Isometric and Puro.earth registries.
• CAPEX calculator: online form to estimate investment.

Rice mills and agricultural processors in Vietnam can convert rice husk and straw into biochar and carbon credits. Palm, rubber and wood processors can treat plantation residues on site. Developers of biochar projects can buy standard units instead of custom plants.

Plant owners get a standard package with stated payback of about 3 years and about 4 months from order to production. AgNavigator reports it is about two-thirds the cost of traditional systems. Syngas powers the process, and carbon credits can be verified under Puro.earth or Isometric. A CAPEX calculator is provided.

Biochar carbon removal is expanding in tropical plantation regions where agricultural waste is abundant. Onnu plans a rollout across Malaysia, Thailand and Indonesia targeting 360,000 tonnes of CO2e a year, showing demand for modular pyrolysis equipment in Southeast Asia including Vietnam.

UK company number 13656501. First Southeast Asian deployment in Sabah, East Malaysia with Agrotech Bioenergy: two CarboFlow units processing 41,820 tonnes of wet biomass a year for 1,924 tonnes of biochar (AgNavigator, December 2025). CEO named as Giles Welch.