Forced Convective Drying of Wastewater Sludge with Presentation of Exergy Analysis of the Dryer

[en] The main objective is studying the fundamental aspect, by the mean of the drying kinetics, the application of forced convective drying of wastewater sludge with determination of the optimum drying conditions. The drying system is composed of two units; small samples of 2.5 g are dried in the first unit and bed of sludge weighting 250 g is dried the second unit. The experiments are performed under air temperatures varying between 80°C and 200°C. The range of the air velocity and its humidity is 1- 2 m/s and 0.005- 0.05 kgwater/kgdry air, respectively. The experiments are performed for two different sludges; activated sludge (AS) and thermalized and digested sludge (TDS). Usually, three main drying phases are observed during drying of bed of sludge. These phases are reduced to only two for small samples. Determination of the influent parameters shows that temperature of the drying air and sludge origin can profoundly influence the drying kinetic of the sludge. The exergy analysis of the two units of the drying system allows selecting 140 °C, 2 m/s, 0.05 kgwater/kgdry air as optimum drying condition with an exergy efficiency reaching 90\%.

Disciplines :

Chemical engineering

Author, co-author :

Bennamoun, Lyes; University of New Brunswick > Department of Mechanical Engineering

Fraikin, Laurent ; Université de Liège > Department of Chemical Engineering > Génie chimique - Procédés et développement durable

Li, Jie; Wuhan University of Technology > Department of Thermal Engineering

Léonard, Angélique ; Université de Liège > Department of Chemical Engineering > Génie chimique - Procédés et développement durable

Language :

English

Title :

Forced Convective Drying of Wastewater Sludge with Presentation of Exergy Analysis of the Dryer

Publication date :

2016

Journal title :

Chemical Engineering Communications

ISSN :

0098-6445

eISSN :

1563-5201

Publisher :

Taylor & Francis, United Kingdom

Volume :

203

Pages :

855–860

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

http://dx.doi.org/10.1080/00986445.2015.1114475

Funders :

F.R.S.-FNRS - Fonds de la Recherche Scientifique
FRFC - Fonds de la Recherche Fondamentale Collective

Commentary :

Postdoc in ULg

Available on ORBi :

since 27 January 2016

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