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Two-phase anaerobic digestion of waste activated sludge: effect of an extreme thermophilic (70oC) pre-fermentation step

Two-phase anaerobic digestion of waste activated sludge: effect of an extreme thermophilic (70oC) pre-fermentation step
Two-phase anaerobic digestion of waste activated sludge: effect of an extreme thermophilic (70oC) pre-fermentation step
This paper deals with the application of a two-phase anaerobic digestion process where the first phase operates at extreme thermophilic conditions (70 °C). The first reactor was fed with waste activated sludge and operated continuously at a hydraulic retention time of 1, 2, 3, and 5 days. Pretreated sludge was characterized by high concentrations of soluble COD (30?40% of the influent particulate COD) and VFA contents. Acetate, propionate, and isovalerate were the main compounds detected. The kinetic constant for the hydrolysis process was determined in 0.17 day-1. Batch tests for the following anaerobic digestion and biogas production showed how the pretreated sludge determined better performances in terms of biogas production. The gas production showed increases in the range 30?50% for pretreatments of 2?3 days compared to the mesophilic and thermophilic single-stage tests. A calculation for a 100000 people equivalent wastewater treatment plant showed that the increased biogas production allowed maintenance of the thermophilic conditions in both the first and second stages of a two-phase process and recovery of the investment costs in some 3?4 years.
0888-5885
6650-6655
Bolzonella, D
554b33d4-ce6f-4d05-93ac-fcc5d49187f3
Zanette, M
4e798c81-4fca-43d3-90c5-544aa6d333c2
Pavan, P
751d1ae9-f461-4af4-9781-66c9df174a3d
Cecchi, F
97cd0131-4631-48fe-8242-c9b9fb04b0ad
Bolzonella, D
554b33d4-ce6f-4d05-93ac-fcc5d49187f3
Zanette, M
4e798c81-4fca-43d3-90c5-544aa6d333c2
Pavan, P
751d1ae9-f461-4af4-9781-66c9df174a3d
Cecchi, F
97cd0131-4631-48fe-8242-c9b9fb04b0ad

Bolzonella, D, Zanette, M, Pavan, P and Cecchi, F (2007) Two-phase anaerobic digestion of waste activated sludge: effect of an extreme thermophilic (70oC) pre-fermentation step. Industrial & Engineering Chemistry Research, 46 (21), 6650-6655. (doi:10.1021/ie061627e).

Record type: Article

Abstract

This paper deals with the application of a two-phase anaerobic digestion process where the first phase operates at extreme thermophilic conditions (70 °C). The first reactor was fed with waste activated sludge and operated continuously at a hydraulic retention time of 1, 2, 3, and 5 days. Pretreated sludge was characterized by high concentrations of soluble COD (30?40% of the influent particulate COD) and VFA contents. Acetate, propionate, and isovalerate were the main compounds detected. The kinetic constant for the hydrolysis process was determined in 0.17 day-1. Batch tests for the following anaerobic digestion and biogas production showed how the pretreated sludge determined better performances in terms of biogas production. The gas production showed increases in the range 30?50% for pretreatments of 2?3 days compared to the mesophilic and thermophilic single-stage tests. A calculation for a 100000 people equivalent wastewater treatment plant showed that the increased biogas production allowed maintenance of the thermophilic conditions in both the first and second stages of a two-phase process and recovery of the investment costs in some 3?4 years.

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Published date: 2007

Identifiers

Local EPrints ID: 189057
URI: https://eprints.soton.ac.uk/id/eprint/189057
ISSN: 0888-5885
PURE UUID: 9726def4-9720-4a30-ad60-26ca3eefe7fa

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Date deposited: 01 Jun 2011 10:38
Last modified: 18 Jul 2017 11:41

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