Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 26, Issue 6, Pages 1325-1331Publisher
SCIENCE PRESS
DOI: 10.1016/S1001-0742(13)60607-5
Keywords
effluent organic matter; fouling; ultrafiltration; oxidation; molecular weight distribution; acidity
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Funding
- National Research Foundation of Korea (NRF) - Korean government (MEST) [2012R1A1B3002152, 2013R1A2A2A03016095]
- National Research Foundation of Korea [2012R1A1B3002152, 2013R1A2A2A03016095] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Effluent organic matter (EfOM) is the major cause of fouling in the low pressure membranes process for wastewater reuse. Coagulation and oxidation of biological wastewater treatment effluent have been applied for the fouling control of microfiltration membranes. However, the change in EfOM structure by pre-treatments has not been clearly identified. The changes of EfOM characteristics induced by coagulation and ozonation were investigated through size exclusion chromatography, UV/Vis spectrophotometry, fluorescence spectrophotometry and titrimetric analysis to identify the mechanisms in the reduction of ultrafiltration (UP) membrane fouling. The results indicated that reduction of flux decline by coagulation was due to modified characteristics of dissolved organic carbon (DOC) content. Total concentration of DOC was not reduced by ozonation. However, the mass fraction of the molecules with molecular weight larger than 5 kDa, fluorescence intensity, aromaticity, highly condensed chromophores, average molecular weight and soluble microbial byproducts decreased greatly after ozonation. These results indicated that EfOM was partially oxidized by ozonation to low molecular weight, highly charged compounds with abundant electron-withdrawing functional groups, which are favourable for alleviating UP membrane flux decline.
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