Whey to biogas
Manawatu Standard
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Massey University and Palmerston North City Council have found a way to increase the production of biogas to help drive the council's cogeneration engine to produce steam and electricity.
Laboratory trials at Massey have shown that previously unwanted whey, a by-product of milk processsing, can be mixed "co-digested" with sludge from the Totara Road Treatment Plan.
Now a full scale trial is under way at the wastewater plant to develop a cheap method of disposing of whey, increase gas production from the city's digesters and ultimately earn more carbon credits.
"If it proves to be successful - and indications are positive - it could become a permanent addition to the wastewater treatment process," council water and waste services manager Chris Pepper said.
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