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Tunisian waste is rich in organic and hence fairly wet. This causes technical Problems and adverse environmental effects when landfilled. But next to the formation of leachate and landfill gas also operation problems were observed especially at pit landfills because of unsufficient drainage of the leachate which resulted in situations that the whole waste is soaked with leachate and hence the mechanical stability is reduced. The main objective of the pilot test was to prove that the PMB is a feasible solution for the conditions in Tunisia and an adequate option to overcome some of the Problems mentioned above.
To test MBT for Tunisian a windrow composting system with forced aeration was installed. Composting trials have been conducted over the course of one year to determine seasonal impacts. To protect the windrows from sun and rain membranes were used to cover the windrows. In a first step the total waste was biologically dried, then RDF was separated by a simple screening steps. The fines were then further matured with the composting system to achieve a stable product. The windrows were turned once a week and irrigated as required. The composting process was Computer controlledand samples were taken and analysed during the whole process to monitor the drying and stabilization process. The results from these trials encouraged the Tunisian National Agency for Waste Management (ANGed) to establish MBT as part of their waste treatment strategy.
Aziz Belherazem, Romain Revol, Patrick Winckel, Elyes Guesmi; Hamza Jbili, Mehrez Chakchouk;Ridha Brahi6, Habib Omrane
|Copyright:||© Wasteconsult international|
|Source:||Waste-to-Resources 2015 (May 2015)|
Dr.-Ing. Abdallah Nassour
Dr.-Ing. Wolfgang Pfaff-Simoneit
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