Dynamic behaviour of river colloidal and dissolved organic matter through cross-flow ultrafiltration system

Publisher:
ACADEMIC PRESS INC ELSEVIER SCIENCE
Publication Type:
Journal Article
Citation:
Journal of Colloid and Intrface Science, 2005, 251 (2), pp. 152 - 158
Issue Date:
2005-01
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Through cross-flow filtration (CFF) with a 1-kDa regenerated cellulose Pellicon 2 module, the ultrafiltration characteristics of river organic matter from Longford Stream, UK, were investigated. The concentration of organic carbon (OC) in the retentate in the Longford Stream samples increased substantially with the concentration factor (cf ), reaching approximately 40 mg/L at cf 15. The results of dissolved organic carbon (DOC) and colloidal organic carbon (COC) analysis, tracking the isolation of colloids from river waters, show that 2 mg/L of COC was present in those samples and good OC mass balance (77101%) was achieved. Fluorescence measurements were carried out for the investigation of retentate and permeate behaviour of coloured dissolved organic materials (CDOM). The concentrations of CDOM in both the retentate and permeate increased with increasing cf , although CDOM were significantly more concentrated in the retentate. The permeation model expressing the correlation between loglog[CDOM] in the permeate and logcflogcf was able to describe the permeation behaviour of CDOM in the river water with regression coefficients (r2r2) of 0.94 and 0.98. Dry weight analysis indicated that the levels of organic colloidal particles were from 49 to 71%, and between 29 and 51% of colloidal particles present were inorganic. COC as a percentage of DOC was found to be 1016% for Longford Stream samples.
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