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Comparison of Sludge Granule and UASB Performance by Adding Chitosan in Different Forms


Paper Type 
Contributed Paper
Title 
Comparison of Sludge Granule and UASB Performance by Adding Chitosan in Different Forms
Author 
Boonyarit Nuntakumjorn, Wuthichok Khumsalud, Naret Vetsavas, Thoranin Sujjaviriyasup and Chantarapor
Email 
cpk@kmitnb.ac.th, cphalak21@yahoo.com
Abstract:
This study prepared chitosan with the same properties, i.e. molecular weight and degree of deacetylation in different forms, i.e. solution, bead and powder, and compared their effectiveness in enhancing granulation and UASB performance. A natural polymer chitosan in the form of freely moving polymeric chains was found to enhance sludge granulation and the efficiency of UASB system. The UASB with chitosan addition had a 9-59% lower effluent COD, 5-7% higher COD removal, up to 25% higher biogas production rate, 21-39% lower biomass washout, 37% larger particle size and 4 day longer sludge retention time. The differences are significant (P<0.05). However, chitosan in the form of bead and powder did not help enhance granulation process and UASB performances significantly. It was concluded that the size of the particles serving as inert nuclei and the chance of contact between the inert nuclei and biomass were very important. Surprisingly, even though chitosan powders had the net positive charges, their role in reducing electrostatic interaction between negatively charged bacteria was not prominent.
Start & End Page 
95 - 102
Received Date 
2007-09-19
Revised Date 
Accepted Date 
2007-10-05
Full Text 
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Keyword 
Anaerobic Granulation, Chitosan, Granule, UASB
Volume 
Vol.35 No.1 (JANUARY 2008)
DOI 
Citation 
Nuntakumjorn B., Khumsalud W., Vetsavas N., Sujjaviriyasup T. and Chantarapor , Comparison of Sludge Granule and UASB Performance by Adding Chitosan in Different Forms, Chiang Mai J. Sci., 2008; 35(1): 95-102.
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