Livestock

Affluent effluent possible for piggeries

Alan Skerman Shao Dong Yap Rob Wilson Stephan Tait_0165
Alan Skerman, Shao Dong Yap, Rob Wilson and Stephan Tait all tackled how to turn piggery waste into potentially profitable bioenergy under the Pork CRC’s successful Bioenergy Support Program. Image courtesy of Pork CRC

About 16 per cent of the manure effluent of the Australian pig herd is now directed to biogas systems, equating to 29 per cent of the herd housed in conventional sheds at piggeries larger than 500 sow farrow-to-finish, which is the cut-off for feasibility of these systems.

Before Pork CRC’s Bioenergy Support Program (BSP) commenced in 2012, manure from only about two per cent of the national herd was directed to biogas systems.

According to Alan Skerman, Queensland Department of Agriculture and Fisheries and Dr Stephen Tait, University of Queensland (now at University of Southern Queensland), the BSP’s positive impact on biogas adoption has been substantial.

Pork producers with biogas systems now benefit from reduced odour, save on energy costs, sell excess biogas-derived electricity to the supply grid and sell Australian Carbon Credit Units (ACCUs) and renewable energy certificates. Capital expenditure payback periods of less than three years have been realised.

Since 2012/13, when the Emissions Reduction Fund started, 372,143 ACCUs have been issued to piggery biogas projects, which is 372 kt CO2-e of emissions abatement and an estimated $4 million of carbon credit sale value to participating producers.

Covered anaerobic pond at a 20,000 standard pig unit grow-out piggery in New South Wales. Image courtesy of Pork CRC

Covered anaerobic pond at a 20,000 standard pig unit grow-out piggery in New South Wales. Image courtesy of Pork CRC

A Pork CRC supported life cycle assessment by Stephen Wiedemann of Integrity Ag Services has predicted that greenhouse gas emissions of Australia’s pork production could fall from 3.6 kg (in 2010) to near 1.3kg of CO2 equivalents per kilogram of pork produced by 2020/21.

Pork CRC consultant and former CEO, Dr Roger Campbell, believed this was due to the uptake of biogas capture and use from effluent and increasing productivity by the herds and businesses which will represent the industry in 2020/21.

Pork CRC’s Bioenergy Support Program has been a producer-steered technical support program to enable biogas adoption across the Australian and New Zealand pork sectors.

The BSP conducted industry-tailored research to provide technical know-how for producers, industry service providers, consultants and regulators to assist in the planning, design, construction, commissioning and operation of piggery biogas systems.

The research and technical support of the BSP drew heavily on contributions by Pork CRC biogas demonstration piggeries, established as part of the BSP initiative.

A recent national piggery biogas survey provided useful data on current and future biogas adoption interest and statistics, which indicated considerable ongoing interest in biogas benefits, including from smaller piggeries.

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