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Agri - Industrial Wastes
What Waste?
The agricultural industry has long been a pioneer in resource recovery. Animal manure? an organic fertiliser! Crop residues from cereal harvesting? animal bedding! Brewer's grains? A high energy animal feed.
So what can be done to improve?
Dairy & Piggery Industry
Slurries & Manures
Slurries and manures when spread directly to land whilst an amazing fertiliser can release fugitive methane emissions that are 28x the global warming potential of CO2! Using anaerobic digestion to produce renewable gas reduces this global warming potential and increases the availability of nutrients especially Nitrogen in the fertiliser.
Dilute Slurries & Liquid Wastes
If the animal slurry has a low total solids content then the water could also be recovered. Other liquid wastes such as whey from cheese processing, spoilt milk products and cleaning wastewater can all undergo wastewater treatment to recover valuable energy and water.
Other Solid Wastes
Other wastes include spoilt solid products from dairy processing and spoilt animal feed or residues of can be used to recover energy through anaerobic digestion.
Crops & Residues
Crop Residues
Crop residues if collected wet during the grain harvesting process have a lot of energy potential that can be easily utilised through anaerobic digestion. If it is left to dry in the field, the residue becomes more lignocellulosic which can reduce the effectiveness of AD without further treatment.
Vegetable Processing Wastewater
Wastewater from vegetable washing and peeling especially potatoes can be very high in solube organics mainly starch that are energy-rich and in to dilute concentration for recovery to be viable. However, energy production as part of wastewater treatment to recover the water for reuse or irrigation is a suitable option.
Crops
Whilst growing crops for anaerobic digestion undermines the ethicalness and renewable nature of the technology there are some unfortunate times when due to unprecedented weather that they are unfit for human consumption or simply rejected. Whilst not typically viable by itself this can always be added for co-digestion with other feedstocks.
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