Develop a nutrient product farmers can assess and trust.
Digestate is residual material from anaerobic digestion. It can offer nutrient and agricultural value where its composition, treatment and use are appropriate. Commercial value depends on consistent quality, lawful application and the cost of delivering a useful product to farms. [[ US Environmental Protection Agency, How Does Anaerobic Digestion Work? ](https://www.epa.gov/agstar/how-does-anaerobic-digestion-work), [ Environment Protection Authority Victoria, Safe production and use of digestate guidelines ](https://www.epa.vic.gov.au/safe-production-and-use-digestate-guidelines)] Victoria’s EPA digestate guidance is a jurisdiction-specific reference, not approval for transport or land application in another state.
Define the product before the market total
Record feedstock origin, treatment, solids content, nutrient analysis and relevant contaminants. Separate liquid and solid fractions where the process requires it. Laboratory results should identify the material and batch tested rather than imply that one sample represents all future production.
Match nutrients with local conditions
Farmers need to know useful nutrient availability, application rates and suitability for their soils and crops. Assess seasonal windows, storage, spreading equipment and transport. A bulky material can have useful nutrient content but limited net value over long distances. Shelby recommends qualified agronomic advice and local trials before broad performance claims.
Compare processing options
Separation, concentration or nutrient recovery may improve product handling and marketability. Evaluate the additional equipment, energy and residual streams against the value customers will recognise. Do not assume processing always creates a premium product.
Learn from quality frameworks
England’s resource framework links qualifying digestate to conditions including eligible inputs, quality and certification. Sweden’s voluntary SPCR 120 scheme offers a separate quality-assurance precedent. These demonstrate approaches to trust and market access; they do not establish Australian approval. [[ Environment Agency / UK Government, Anaerobic digestate: resource framework ](https://www.gov.uk/guidance/anaerobic-digestate-resource-framework), [ RISE Research Institutes of Sweden, Certification of biofertilizer ](https://www.ri.se/en/agriculture/service/certification-of-biofertilizer-spcr-120)]
Put lawful use in the project plan
Confirm classification, transport and receiving-site requirements in the relevant jurisdiction. A reliable outlet can reduce disposal risk and support financing. If no qualified buyer or use is secured, include storage and disposal costs rather than assuming all output generates income.
Nutrient potential is not a second sales revenue
Digestate needs tested wet/dry composition, separate N/P/K bases, lawful product status, seasonal land capacity and a destination. Nutrient replacement value is a ceiling, not necessarily a price. Do not count the buyer's avoided fertiliser purchase as extra Shelby revenue on top of the same product sale. Separation, storage, transport, testing, application and disposal can make net value negative. The current four-tool release does not calculate nutrient closure or approved spreading acreage; obtain site-specific agronomic and regulatory evidence.
Match the digestate specification with lawful local use
Digestate is an anaerobic-digestion output, not automatically a packaged fertiliser. Its input history, moisture, nutrient content and contaminants determine handling and potential use.
| Evidence line | Practical check | Commercial consequence |
|---|---|---|
| Process / inputs | Trace incoming materials and digestion conditions | Input eligibility and contaminant risk |
| Liquid / fibre fraction | Measure moisture, separation performance and nutrients | Storage, spreading and transport requirements |
| Safety / quality | Representative pathogen, metal and relevant contaminant tests | Customer acceptance and permitted-use conditions |
| Farm demand | Agronomic fit, soil need, timing and available land | Realistic seasonal quantities; not an assumed national market |
| Storage / environment | Odour, runoff, capacity and handling plan | Compliance and ongoing operating costs |
| Legal status | Applicable waste classification and authorised reuse | No sale / spreading until the actual conditions are met |
In NSW, resource recovery orders and exemptions are material- and activity-specific: do not assume a generic compost permission covers a proposed digestate. Victoria's digestate guidance describes waste duties and conditional low-risk pathways; the exact feedstock and output must meet the applicable requirements. These are state examples, not Australia-wide authorisation.
Estimate netback after testing, separation, treatment, storage, loading and transport. A nutrient-value estimate is not a second sales revenue when the same product sale is already counted. Independent tests and accepting customers must support demand before recognising a dependable return.
Official references (publisher links and titles checked 11 October 2026): NSW Environment Protection Authority, Current resource recovery orders and exemptions; Environment Protection Authority Victoria, Digestate. Project-specific eligibility and permissions remain subject to the applicable current documents.
Frequently asked questions
Is digestate automatically an approved fertiliser?
No. Classification, quality, treatment and permitted use must be established for the relevant location.
Can digestate replace all synthetic fertiliser?
Do not assume that. Nutrient availability, crop needs and agronomic advice determine appropriate substitution.
Does certification create customer demand?
It can support trust; performance, convenience and delivered value still matter.
Sources & References
- US Environmental Protection Agency, How Does Anaerobic Digestion Work?
Publication: 2019-03-18
Observation period: United States; general technology description
Relevant page / section: Claim-level locator not yet verified
Last link / title verification: 2026-10-11
Publisher link checked; individual claims, costs and regulatory applicability still require review.
Supports process definitions. No Australian cost or project-outcome inference.
- Environment Protection Authority Victoria, Safe production and use of digestate guidelines
Publication: 2024-01-29
Observation period: Environmental framework and digestate guidance
Relevant page / section: Victorian digestate production and use guidance
Last link / title verification: 2026-10-11
Publisher link checked; individual claims, costs and regulatory applicability still require review.
High for published guidance; check current instruments and project conditions
- Environment Agency / UK Government, Anaerobic digestate: resource framework
Publication: 2025-10-20
Observation period: England; qualifying digestate
Relevant page / section: End-of-waste criteria; England only
Last link / title verification: 2026-10-11
Publisher link checked; individual claims, costs and regulatory applicability still require review.
Published 20 October 2025. Jurisdiction- and condition-specific end-of-waste framework, not a blanket digestate exemption.
- RISE Research Institutes of Sweden, Certification of biofertilizer
Publication: Date not verified
Observation period: Sweden; voluntary certification
Relevant page / section: Claim-level locator not yet verified
Last link / title verification: 2026-10-11
Publisher link checked; individual claims, costs and regulatory applicability still require review.
Page date not shown; quality assurance does not automatically establish Australian regulatory acceptance.
- Shelby Bioenergy, Shelby’s National Renewable Gas Policy consultation response
Publication: 2026-10
Observation period: October 2026
Relevant page / section: Supplied company position
Last link / title verification: Not verified
Company position / supplied material, not independent evidence.
Proposals and scenarios, not adopted policy or market offers.
- NSW Environment Protection Authority, Current resource recovery orders and exemptions
Publication: Date not verified
Observation period: Publisher page retrieved 11 October 2026
Relevant page / section: Current orders and exemptions list
Last link / title verification: 2026-10-11
Publisher link checked; individual claims, costs and regulatory applicability still require review.
Material-specific order/exemption and renewal status require checking; no generic digestate permission established.
- Environment Protection Authority Victoria, Digestate
Publication: 2025-05-28
Observation period: Publisher page retrieved 11 October 2026
Relevant page / section: Digestate and the law; duties and management requirements
Last link / title verification: 2026-10-11
Publisher link checked; individual claims, costs and regulatory applicability still require review.
Digestate is pre-classified as reportable priority waste. Conditional pathways require compliance with the actual determination.