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Autohydrolysis pretreatment of secondary sludge for anaerobic digestion

Paper ID Volume ID Publish Year Pages File Format Full-Text
3303 163 2013 11 PDF Available
Title
Autohydrolysis pretreatment of secondary sludge for anaerobic digestion
Abstract

•Secondary sludge pretreatment at 55 °C and a limited amount of oxygen.•Effect of initial sludge concentration and presence of air during the pretreatment.•The methane productivity was increased by 23%.•Microbial activity was detected by the consumption of carbohydrates and oxygen.•The increase in energy production covered the extra energy required for the pretreatment.

The increase in the number of wastewater treatment plants and the quality required for the residue produced makes it necessary to improve the efficiency of anaerobic digestion of sludge. Pretreatments of secondary sludge have shown important advantages in the elimination of volatile solids and pathogenic microorganisms from the sludge, and they have also had a positive effect on biogas production. However, such methods are associated with high operating costs. This paper shows the behavior of a autohydrolysis pretreatment, which consists of subjecting the secondary sludge to a temperature of 55 °C for 12–24 h with a limited amount of oxygen under batch operation. The pretreatment results in a high solubilization of organic matter, increasing the fluidity of the sludge and improving the biogas production. This study focuses on the evaluation of the influence of oxygen and the initial sludge concentration on the pretreatment behavior. The main results obtained showed that when autohydrolysis pretreatment was carried out for 12 h, with a high solid concentration and microaerobic conditions, the solubilization of organic matter was increased by 40%, the methane productivity was improved by 23%, and there was an overall improvement in sludge fluidity. Moreover, the energy assessment of the autohydrolysis pretreatment and anaerobic digestion system showed the energetic feasibility of this treatment method, since the increase in energy production compensates for the extra energy required to carry out the pretreatment.

Keywords
Anaerobic processes; Biogas; Enzymes; Improvement; Rheology; Sludge pretreatment
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 75, 15 June 2013, Pages 21–31
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us