Improved compaction of dried tannery wastewater sludge

Waste Management
M Della ZassaP Canu

Abstract

We quantitatively studied the advantages of improving the compaction of a powder waste by several techniques, including its pelletization. The goal is increasing the mass storage capacity in a given storage volume, and reducing the permeability of air and moisture, that may trigger exothermic spontaneous reactions in organic waste, particularly as powders. The study is based on dried sludges from a wastewater treatment, mainly from tanneries, but the indications are valid and useful for any waste in the form of powder, suitable to pelletization. Measurements of bulk density have been carried out at the industrial and laboratory scale, using different packing procedures, amenable to industrial processes. Waste as powder, pellets and their mixtures have been considered. The bulk density of waste as powder increases from 0.64t/m(3) (simply poured) to 0.74t/m(3) (tapped) and finally to 0.82t/m(3) by a suitable, yet simple, packing procedure that we called dispersion filling, with a net gain of 28% in the compaction by simply modifying the collection procedure. Pelletization increases compaction by definition, but the packing of pellets is relatively coarse. Some increase in bulk density of pellets can be achieved by tapping; vibrat...Continue Reading

References

May 1, 1995·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·J B KnightS R Nagel
Sep 1, 1996·Physical Review. E, Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics·S J Linz
Aug 26, 2003·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·M A NaylorP J King
Jul 5, 2011·Water Research·Anwar Khursheed, A A Kazmi
Oct 11, 2012·Waste Management·M ZerlottinP Canu

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