Experimental and theoretical research on agitated contact drying of sewage sludge in a continuous paddle dryer. Issue 16 (9th December 2016)

• Record Type: Journal Article
• Authors: Chen, Shaoqing; Wang, Fei; Milhé, Mathieu; Arlabosse, Patricia; Liang, Fenglin; Chi, Yong; Nzihou, Ange; Yan, Jianhua
• Is Part Of: Drying technology. Volume 34:Issue 16(2016)
• Page Start: 1979
• Page End: 1990
• Publication Date: 2016-12-09
• Subjects: Continuous paddle dryer -- drying kinetics -- Markov chain -- penetration model -- sewage sludge; Drying -- Periodicals; Desiccation; 660.28426
• DOI: 10.1080/07373937.2016.1147457
• Languages: English
• ISSNs: 0737-3937

Abstract

ABSTRACT: Sludge drying is an important intermediate process for sewage sludge treatment, usage, and disposal. A series of drying experiments were conducted in a continuous paddle dryer in order to have a better understanding of the sludge drying mechanism. The couple model of penetration model and Markov chain was used to simulate the drying kinetics in a continuous paddle dryer. The drying process has been compared in experimental and theoretical results, which show good agreement. The sewage sludge drying process in a continuous paddle dryer can be divided into three stages: the pasty phase, the sticky phase, and the complete-granular phase. The influences of the drying parameters on the sludge drying kinetics in a continuous paddle dryer were investigated. The sludge flow rate, dryer wall temperature, and dryer slope have remarkable influence on sludge drying in the examined range, but the stirrer speed and steam temperature have little influence on the drying kinetics.