Issues related to waste sewage sludge drying under superheated steam

Hamawand, Ihsan and da Silva, Wilton Pereira and Eberhard, Friederike and Antille, Diogenes L. (2015) Issues related to waste sewage sludge drying under superheated steam. Polish Journal of Chemical Technology, 17 (4). pp. 5-14. ISSN 1899-4741

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Abstract

Sewage sludge was dried in a rotary drum dryer under superheated steam. Particle size and moisture content were shown to have significant influences on sticking and agglomeration of the materials. Pouring partially dried sludge (70–80% moisture content, wet basis) directly into the screw feeder of the drum dryer resulted in a significant sticking to the surface of the drum and the final particle size of the product was greater than 100 mm in diameter. The moisture content of this product was slightly less than its initial value. To overcome this issue, the sludge was mixed with lignite at variety ratios and then chopped before being introduced to the feeding screw. It was found that mixing the sludge with lignite and then sieving the chopped materials through a four millimetre mesh sieve was the key to solve this issue. This technique significantly reduced both stickiness and agglomeration of the material. Also, this enabled for a significant reduction in moisture content of the final product.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Open access journal.
Faculty / Department / School: Current - USQ Other
Date Deposited: 04 Oct 2016 00:28
Last Modified: 06 Oct 2016 02:38
Uncontrolled Keywords: sewage sludge; agglomeration; sticking; liquid bridge; rotary drum dryer; superheated steam
Fields of Research : 09 Engineering > 0904 Chemical Engineering > 090409 Wastewater Treatment Processes
Socio-Economic Objective: D Environment > 96 Environment > 9611 Physical and Chemical Conditions of Water > 961101 Physical and Chemical Conditions of Water for Urban and Industrial Use
Identification Number or DOI: 10.1515/pjct-2015-0062
URI: http://eprints.usq.edu.au/id/eprint/29796

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