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Characteristics Transformation of Humic Acid During Ozonation and Biofiltration Treatment Processes

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Characteristics transformation of humic acid extracted from natural water during the ozonation and biofiltration treatment processes was investigated based on the analyses of total organic carbon, UV absorbance, infrared spectroscopy, and gel permeation chromatography. With ozone doses of 1, 4, and 7 mg/L, high-molecular-weight humic acid was cleaved into low-molecular-weight particles and accumulated at group 6 (molecular weight ≤4000 g/mole) on the Sephadex G-75 (Pharmacia Fine Chemicals, Uppsala, Sweden) fraction. Furthermore, the molecular-size distribution of organic compounds by Sephadex G-25 was shifted from groups 2 (molecular weight  =  4000 to 400 g/mole) and 3 (molecular weight  =  400 to 180 g/mole) to groups 2, 3, and 4 (molecular weight ≤180 g/mole) under ozone doses of 1 and 4 mg/L. An increased ozone dose destroyed functional groups C = C and C-O of aromatic and phenolic compounds and increased UV-insensitive biodegradable organic carbon for subsequent biofiltration.

Keywords: biofiltration; characteristics transformation; ozonation

Document Type: Research Article


Affiliations: Department of Safety, Health and Environmental Engineering, Central Taiwan University of Science and Technology, Taichung, Taiwan

Publication date: 2011-05-01

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    Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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