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Influence of Chitosan Characteristics and Environmental Conditions on Flocculation of Anaerobic Sludge
Author(s) -
Kaseamchochoung Chudapak,
Lertsutthiwong Pranee,
Phalakornkule Chantaraporn
Publication year - 2006
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143005x72830
Subject(s) - chitosan , flocculation , chemistry , ionic strength , cationic polymerization , chemical engineering , nuclear chemistry , polymer chemistry , organic chemistry , aqueous solution , engineering
The effects of chitosan characteristics (i.e., degree of deacetylation [DD] and molecular weight) and environmental conditions (i.e., ionic strength and pH) on the flocculation of anaerobic sludge were investigated. The results showed that chitosan enhanced the flocculation of sludge, and the flocculation efficiency depended on both the degree of deacetylation and molecular weight. Chitosan with 85%DD was more effective than that with 70%DD, as the former required a lower dose to obtain 90% flocculation at all studied pH values. In addition, low molecular weight chitosan enhanced the flocculation better than high molecular weight chitosan. The increase in ionic strength (up to 0.1 M) of the suspension helped reduce restabilization that occurred when chitosan was overdosed. In general, chitosan has potential to be used as an effective cationic bioflocculant, which is able to function either in acidic or neutral conditions, and very small amounts of chitosan (less than 4 mg/g dried sludge) are required.