<abstract xmlns="http://www.w3.org/1999/xhtml"><p>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.</p></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.

Issues related to waste sewage sludge drying under superheated steam

University of Southern Queensland, National Centre for Engineering in Agriculture, Toowoomba, QLD, Australia

Federal University of Campina Grande, Paraíba, Brazil

Polish Journal of Chemical Technology

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

{"article-title":"Issues related to waste sewage sludge drying under superheated steam"}

Sewage sludge was dried in a rotary drum dryer under superheated steam. Particle size and moisture content were shown to have significant influences on...

Issues related to waste sewage sludge drying under superheated steam

Publié en ligne: 27 nov. 2015

Pages: 5 - 14

DOI: https://doi.org/10.1515/pjct-2015-0062

Mots clés
Sewage sludge, agglomeration, sticking, liquid bridge, rotary drum dryer, superheated steam

© 2015 Ihsan Hamawand et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Issues related to waste sewage sludge drying under superheated steam

Publié en ligne: 27 nov. 2015

Pages: 5 - 14

DOI: https://doi.org/10.1515/pjct-2015-0062

Mots clésSewage sludge, agglomeration, sticking, liquid bridge, rotary drum dryer, superheated steam

© 2015 Ihsan Hamawand et al., published by De Gruyter Open

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
Sewage sludge, agglomeration, sticking, liquid bridge, rotary drum dryer, superheated steam