Gravitational drainage of compressible organic materials
Journal article, 2010

A model was developed to simulate drainage of compressible particle suspensions, and study how cake compression and volumetric load influence the process. The input parameters were settling velocity, cake resistance and compressibility. These parameters were found using a new experimental method. Dextran-MnO2 particle suspensions were drained as these resemble organic waste slurries with respect to settling and compressibility. It was demonstrated that cake compressibility must be taken into account to obtain adequate simulations. This implies that pressurized filtration resistances cannot be used for drainage simulations. In the filtration step, a distinct increase of dry matter from top to bottom of the cake was observed. During the subsequent consolidation, the cake compressed and a uniform dry matter profile was found. The final dry matter content of the cake increased with feed concentration and volumetric load. The drainage time increased proportionally with feed concentration and, more importantly, proportionally with squared volumetric load.

specific cake resistance






Morten Lykkegaard Christensen

Aalborg University

Dominik Marek Dominiak

Aalborg University

Per Halkjær Nielsen

Aalborg University

Kristian Keiding

Aalborg University

Maria Sedin

Chalmers, Chemical and Biological Engineering, Forest Products and Chemical Engineering

AICHE Journal

0001-1541 (ISSN) 1547-5905 (eISSN)

Vol. 56 12 3099-3108

Subject Categories

Other Engineering and Technologies not elsewhere specified

Areas of Advance




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