Effects of photolytic ozonation on biodegradability and toxicity of industrial wastewater
In: Journal of environmental science and health. Part A, Environmental science and engineering, Jg. 34 (1999), Heft 4, S. 919-933
academicJournal
- print, 14 ref
Zugriff:
Two industrial wastewaters containing pesticide, dye-auxiliary organics, respectively from BASF Co., Taiwan were used as the model wastewater and treated by photolytic ozonation to investigate the potentiality of photolytic ozonation as a pretreatment step by measuring biodegradability (BOD5/COD), toxicity (EC50), and mineralization efficiency. It was found that as treatment of industrial wastewaters by UV/O3 process for one hour, COD just reduced 6.2%, 18%, TOC also merely decreased 2.4%, 9.5% for pesticide and dye-auxiliary wastewater, respectively, resulting in the value of BOD5/COD enlarged significantly to be an easily biodegradable level, and toxicity declined obviously. At this time, ozone consumption for one gram COD removed was merely 1.375 g, 1.552 g for pesticide and dye-auxiliary wastewater, respectively, indicating extremely efficient with UV/O3 process. On the basis of the results, a photolytic ozonation unit with conditions of UV light intensity 3.0 mW/cm2, ozone supply rate 400 g/m3/hr, and 1 m3 reactor volume is appreciable for allowing wastewaters to have one hour reaction time and then be oxidized to be more biodegradable (BOD5/COD>0.4), less toxic (EC50 reduction>50%), and the most part of mineralization work of wastewater is intended to be done by a following biological unit rather than photolytic ozonation. The combination of photolytic ozonation and biological processes enables process designer to have a good approach to industrial wastewater containing xenobiotic organics.
Titel: |
Effects of photolytic ozonation on biodegradability and toxicity of industrial wastewater
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Autor/in / Beteiligte Person: | KUO, W. S |
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Zeitschrift: | Journal of environmental science and health. Part A, Environmental science and engineering, Jg. 34 (1999), Heft 4, S. 919-933 |
Veröffentlichung: | New York, NY: Dekker, 1999 |
Medientyp: | academicJournal |
Umfang: | print, 14 ref |
ISSN: | 0360-1226 (print) |
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