This paper presents an experimental study which compared different geotextiles for sewage sludge filtration. Five types of geotextiles were tested. Sewage sludge with 3 different moisture contents were used with each geotextile. The experiment lasted 2 months. Great differences were observed between the different geotextiles, some of them being hardly affected and the others being strongly cloggd. The permittivities of the geotextiles were measured before the experiment, after a 2-month exposure to the sewage sludge, and after bacterial release. Reductions of permitttivities gave the global clogging rate. The respective parts of biological clogging and mineral clogging in the overall clogging could thus be determined. The experiment provided incentive results concerning possible utilisation of the enzymatic method as a remediation technique for clogged geotextiles.
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