Effect of Digested Sludge Properties on Mechanical Dewatering Efficiency: An Experimental Approach

To optimize the anaerobic digestion process of residual sludge, co-substrates addition and pre-treatments are increasingly being employed. Nevertheless, if these processes allow the optimization of biogas production, they can significantly impact the efficiency of mechanical dewatering processes for...

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Bibliographic Details
Published in:Drying technology 2015-01, Vol.33 (11), p.1295-1301
Main Authors: Girault, R, Bridoux, G, Nauleau, F, Mégnien, J.-C, Béline, F, Dieudé-Fauvel, E
Format: Article
Language:English
Subjects:
Anaerobic digestion
Biogas
Dewatering
Digestates
Digested sludge
Environmental Sciences
Experiments
Heat treating
Limit dryness
mechanical properties
Optimization
pretreatment
Sludge
Substrates
variance
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Summary:To optimize the anaerobic digestion process of residual sludge, co-substrates addition and pre-treatments are increasingly being employed. Nevertheless, if these processes allow the optimization of biogas production, they can significantly impact the efficiency of mechanical dewatering processes for digested sludge. In this article, the impact of co-substrate addition (oily sludge) and thermal pre-treatment on the efficiency of mechanical dewatering of digested sludge was investigated. To this purpose, mechanical dewatering experiments were conducted at lab-scale by using a filtration-compression cell to determine the limit dryness of various digestates. In addition, control factors of the mechanical dewatering efficiency of digested sludge were investigated. Results highlight that 67% of the variance of the limit dryness of digestates is due to the variable “volatile solid/total solid ratio.”
ISSN:1532-2300
0737-3937
1532-2300
DOI:10.1080/07373937.2015.1026978