Journal
WATER RESEARCH
Volume 40, Issue 20, Pages 3725-3736Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2006.08.017
Keywords
microwave; conventional heating; WAS; molecular weight distribution; biodegradability; pretreatment; solubilization; ultrafiltration
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Microwave (MW) irradiation and conventional heating (CH) at 96 degrees C was successful in disrupting the complex waste activated sludge (WAS) floc structure and releasing extra-and intra-cellular biopolymers, such as protein and sugars from activated sludge flocs into soluble phase along with solubilization of particulate chemical oxygen demand (COD). Soluble CODs of CH and MW-irradiated WAS were 361 +/- 45% and 143 +/- 34% higher and resulted in 475 +/- 3% and 211 +/- 2% higher cumulative biogas productions (CBP) relative to the control at the end of 23 days of mesophilic anaerobic digestion, respectively. Ultrafiltration (UP) was used to characterize the soluble molecular weight (Mw) distributions of control (unpretreated), CH and MW-irradiated WAS. Depending on the Mw fraction, the range of substrate volumetric utilization rate increases from anaerobic digesters was between 94% and 84% for CH and 26-113% for MW compared to the control for the first nine days of the digestion. Digesters treating high Mw (> 300 kDa) materials resulted in smaller biodegradation rate constants, k, indicating that microorganisms require a longer time to utilize high Mw fractions which are most likely cell wall fragments and exopolymers. (c) 2006 Elsevier Ltd. All rights reserved.
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