Development of a conceptual AD facility
ORA was engaged by C.Spencer, a multi-discipline engineering contractor to develop a conceptual model of an AD facility to assist with a preliminary planning application. The study was conducted in three phases and contributed to the client being granted planning permission for their facility:
Process flow of conceptual AD facility
Phase 1 - Review of the potential technologies available
- The influence of feedstock on the performance of AD with particular reference to food waste.
- Digestate characteristics, quality standards and potential markets.
- Biogas cleaning and use, including CHP, direct injection to the gas grid and transport fuel.
- Indicative capital costs, operating costs and maintenance issues.
- Contract structure options and typical timescales.
Phase 2 - Survey of possible sources of feedstocks available in the vicinity of the proposed site
Having agreed a realistic transport radius with the client, ORA contacted nearly 200 organisations likely to be producing food waste, including:
- Local authority household source segregated organic waste.
- Commercial & Industrial (C&I) source segregated organic waste from food manufacturers, food retailers, schools, prisons, hospitals, shipping companies, hotels and restaurants.
- Farming and agriculture.
- Waste collection companies.
Estimates were then compiled of the most likely available sources of suitable feedstocks within the chosen catchment area.
Phase 3 - The preliminary development of a conceptual AD facility
The findings of phases 1 & 2 were reviewed and notional assumptions regarding feedstock qualities and quantities were agreed with the client. ORA was than able to develop the following:
- A process description
- A mass balance and process flow diagram
- A preliminary plant layout
- Heat balance
- Quality of non-biogas outputs
- Estimates of possible emissions to atmosphere
Drawings based on the conceptual design were presented in plan and elevation along with a summary report and evaluation.