There is significant interest within the vegetable industry in maximising efficiency and productivity across the production process, including maximising value from waste streams.
Biogas is methane and carbon dioxide produced from the bacterial degradation of organic waste. Using anaerobic digestion, the process produces electricity, heat and a residual organic product that can be used on-farm as an organic fertiliser.
This study was commissioned to explore in more detail the feasibility of biogas on Australian vegetable farms. Extensive consultation with industry was undertaken, including the development of a number of case studies. The key findings from this analysis were:
The feasibility of biogas on-farm will depend upon the specific context of each operation. However, the following key factors will influence biogas feasibility on-farm:
 Testing typically costs around $2,000-$3,000 per waste type, and the biogas efficiency of different waste types is often commercial in confidence information.
 However, lettuce may be combined with other waste types to produce a high-methane mix.
This paper was presented at the Bioenergy Australia Conference 2014 proceedings, Adelaide (2014).