Centrifugation for separating piggery slurry 1. The performance of a decanting centrifuge |
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| Affiliation: | 1. AFRC Institute of Engineering Research, Silsoe, Bedford MK45 4HS, UK;1. Bioprocess Engineering, AlgaePARC, Wageningen University, P.O. Box 16, 6700 AA Wageningen, The Netherlands;2. Wageningen UR, Food & Biobased Research, AlgaePARC, P.O. Box 17, 6700 AA Wageningen, The Netherlands;3. University of Nordland, Faculty of Biosciences and Aquaculture, N-8049 Bodø, Norway;1. Poznan University of Life Sciences, Institute of Biosystems Engineering, Wojska Polskiego 50, 60-627 Poznan, Poland;2. Institute of Technology and Life Sciences in Falenty, Poznan Branch, Biskupińska 67, 60-463 Poznan, Poland;1. Department of Mechanical Engineering, University of California, 6141 Etcheverry Hall, Berkeley, CA 94720-1740, USA;2. Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lucica 5, 10000 Zagreb, Croatia;3. Energy Technologies Area, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS 90R1121, Berkeley, CA 94720, USA |
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| Abstract: | Odour nuisance arising from piggery slurry can be prevented by aeration. The stability of aerobically treated slurry, which is free of offensive odours, increases as the dry matter of the slurry decreases. This paper investigates the performance of a decanting centrifuge as one means of achieving a lower dry matter in piggery slurry.Slurry was centrifuged to show the effects of various operating conditions; 61% of the total solids were removed from slurry of 8% dry matter content wet basis (d.m.) in the form of fibrous solids of 27% d.m. and 43% of the total solids were removed from slurry of 2% d.m. as fibrous solids of 30% d.m. When the raw slurry had 8% d.m., centrifuging reduced the volume needed for liquid storage by 17%. A particle size analysis of the solids which remained in the centrifuged liquid showed that 98% were less than 0·020 mm diameter. This agrees with the predicted maximum size of particle left in the centrifuged liquid. Centrifuged liquid from the dilute slurry contained only 4% of particles greater than the predicted maximum diameter of 0·012 mm. |
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