Carbon-negative hydrogen production in New Zealand
Te whakaputanga hauwai waro-kore i Aotearoa
Carbon-negative hydrogen production in New Zealand
Te whakaputanga hauwai waro-kore i Aotearoa
From Dairy Manure to Low-Carbon Hydrogen and Solid Carbon
CH4 Zero NZ Ltd is developing an integrated technology platform that combines biological resource recovery with advanced thermal processing to convert dairy-manure-derived renewable methane into low-carbon hydrogen and solid carbon.
The proposed process integrates proven biological conversion technologies with methane upgrading, gas conditioning and plasma methane pyrolysis within a single industrial value chain.
Rather than treating agricultural organic resources as waste, the project is designed to recover their energy potential and convert it into commercially valuable products that support the transition toward a more circular and lower-emissions economy.
The technology configuration, equipment selection and plant design will continue to be refined through feasibility studies, engineering development, technology due diligence and commercial evaluation.
Integrated Process Overview
Stage 1 — Dairy Manure & Farm Dairy Effluent Recovery
The process begins with the recovery of dairy manure and Farm Dairy Effluent (FDE) from participating dairy farms. Appropriate collection, storage and logistics systems are intended to maximise recoverable organic resources while maintaining practical farm operations and environmental performance. Feedstock quality, seasonal availability and transportation logistics will form important components of the overall project design.
Stage 2 — Anaerobic Digestion
Recovered organic material is processed within anaerobic digesters where naturally occurring microorganisms convert biodegradable organic matter into biogas. The digestion process is designed to optimise methane generation while producing a stabilised digestate suitable for appropriate downstream management. Process performance will depend on feedstock composition, operating conditions and plant design.
Stage 3 — Biogas Production
Anaerobic digestion produces biogas consisting primarily of methane and carbon dioxide together with trace compounds that require treatment before further processing. Biogas quality and composition will be continuously monitored to support reliable downstream operation.
Stage 4 — Biogas Upgrading
Raw biogas is upgraded through gas-treatment systems designed to increase methane concentration while removing carbon dioxide, moisture and other impurities. The objective is to produce renewable methane suitable for use within the plasma methane pyrolysis process. Technology selection for gas upgrading will be determined during detailed engineering and commercial evaluation.
Stage 5 — Renewable Methane Storage & Conditioning
Following upgrading, renewable methane is conditioned, compressed where appropriate and temporarily stored to provide a stable and continuous feed supply to the hydrogen production facility. Buffer storage is expected to improve operational reliability by accommodating variations in upstream biogas production and downstream hydrogen demand. Gas quality, pressure and flow control systems will be integrated within the overall plant control philosophy.
Technology Integration
The proposed project combines several complementary technologies within one integrated industrial platform.
Agricultural Resource Recovery
Recoverable dairy manure and Farm Dairy Effluent provide the biological feedstock for renewable methane production.
Agricultural Resource Recovery
Recoverable dairy manure and Farm Dairy Effluent provide the biological feedstock for renewable methane production.
Biological Conversion
Anaerobic digestion converts biodegradable organic matter into biogas.
Renewable Gas Production
Biogas upgrading produces renewable methane suitable for industrial processing.
Renewable Gas Production
Biogas upgrading produces renewable methane suitable for industrial processing.
Advanced Thermal Conversion
Plasma methane pyrolysis converts renewable methane into hydrogen and solid carbon.
Product Conditioning
Hydrogen purification and carbon processing prepare the products for future commercial applications.
Product Conditioning
Hydrogen purification and carbon processing prepare the products for future commercial applications.
Why Plasma Methane Pyrolysis?
Plasma methane pyrolysis represents a fundamentally different hydrogen production pathway from conventional methane reforming. Instead of oxidising methane to generate hydrogen, the process thermally decomposes methane into hydrogen and solid carbon.
This creates the potential for two valuable product streams from a single methane molecule. Potential advantages that continue to be evaluated through project development include:
- Dual-product value creation.
- Renewable methane utilisation.
- Solid-carbon recovery.
- Integration with renewable electricity.
- Modular industrial development potential.
Actual project performance will depend on technology selection, engineering design, operating conditions, electricity supply, feedstock quality and commercial implementation.
Hydrogen Production Pathways
The global hydrogen industry includes several production routes. Each production pathway has different technical, environmental, economic and infrastructure characteristics.
Grey Hydrogen
Natural gas is converted through steam methane reforming, producing hydrogen together with direct process-related carbon dioxide emissions.
Blue Hydrogen
Natural gas is reformed in combination with carbon capture and storage or utilisation technologies.
Green Hydrogen
Renewable electricity is used to split water into hydrogen and oxygen through electrolysis.
Turquoise Hydrogen
Methane is thermally decomposed through pyrolysis, producing hydrogen while recovering methane-derived carbon primarily as a solid material.
Selection of an appropriate technology depends upon feedstock availability, energy sources, project objectives, lifecycle assessment, regional infrastructure and commercial requirements.
Process Control & Operational Reliability
Reliable operation requires careful integration of all process units. The proposed plant design will incorporate process monitoring and control systems covering:
- Feedstock management
- Digester performance
- Biogas quality
- Gas upgrading
- Methane storage
- Reactor operation
- Hydrogen purification
- Carbon recovery
- Utilities
- Instrumentation
- Safety systems
Operational philosophy will continue to be developed during Front-End Engineering Design (FEED) and detailed engineering.
Technology Development Framework
The technology programme is progressing through a structured development process.
Technology Assessment
Process Modelling
Laboratory & Technical Evaluation
Technology Due Diligence
Engineering Integration
Pilot and Demonstration Review (where applicable)
Front-End Engineering Design
Commercial Plant Design
Construction
Commissioning
Commercial Operation
Technology Integrity
Technology descriptions published on this website distinguish between:
Verified Engineering Principles
Scientific and engineering principles that are well established.
Project Development Objectives
Design intentions and planned technical outcomes.
Engineering Assumptions
Parameters used during feasibility studies and engineering analysis.
Technology Under Evaluation
Equipment configurations and technical solutions that remain subject to engineering optimisation, supplier selection or commercial assessment.
Technology Disclaimer
The technology configuration presented on this website represents the current project development concept.
Final process design, equipment suppliers, reactor technology, operating parameters, production capacity, product specifications, energy consumption and commercial performance will be determined through detailed engineering, technology qualification, regulatory approvals and project financing.
Accordingly, information presented on this page should be interpreted within the context of an infrastructure project progressing through feasibility and engineering development rather than as a description of an operational facility.