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Study on Treatment Technique of UV/O3/Fe3+ Applied in Printing and Dyeing Wastewater

Author: CaoYuPing
Tutor: LiuYongJian
School: Suzhou Institute of Technology
Course: Municipal Engineering
Keywords: ozone iron ions photo catalysis advanced treatment
CLC: X703
Type: Master's thesis
Year: 2010
Downloads: 22
Quote: 0
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Abstract


This study uses O3、UV、and Fe3+ technology ,which was applied in the advanced treatment to the secondary biological effluent treated by A/O process from XinDa Printing and Dyeing factory. Study examined treatment effect of Fe3+ dosage、ozone dosage、pH、reaction time and intensity of ultraviolet irradiation. And on this basis, it analyses the interaction between them and a majority of organic matter in printing and dyeing wastewater was directly degradated to CO2 and H2O. In addition, O3/UV/Fe3+ technical used to the advanced treatment the printing and dyeing wastewater treatment and reuse to production that have not been reported at home and abroad. Therefore, this study has a strong innovative and more far-reaching in economic and practical value.Through a series of experiments, the following conclusions:1. The degree of the factors impacting on the removal of COD is: [Fe3+]>[O3]> pH > HRT; The best reaction conditions is: [Fe3+] 3mg/L , [O3] 9.22mg/L, pH value10, hydraulic retention time 60min.In optimum reaction conditions , The removal rate of COD reached 90%, the chroma 2, The removal rate of TOC reached 98%.2. In the initial stage, the synergy between UV and O3 is obvious, as the reaction continues it is not obvious; the synergy between UV and Fe3+ is not as obvious as the synergy between the UV and O3, and even in acidic conditions, it did not show the synergy between them, but UV/O3/Fe3+ reaction system compared to others have a better effect for the total removal of organic matter.3. Fe3+ played a certain role in adsorption in the reaction, and with the pH value increases. However, the role of Fe3+ as flocculants is less than its own in the reaction solution as oxidation catalyst. When Fe3+ was used alone in treatment, it showed smaller as the adsorption and partial catalytic oxidation than in UV/ Fe3+、O3/ Fe3+and O3/UV/Fe3+.4. It illustrates that organic pollutants is degradated into CO2 and H2O directly by UV/O3/Fe3+ reaction system. Through the determination of TOC and UV-visible spectrophotometers spectra.

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CLC: > Environmental science, safety science > Processing and comprehensive utilization of waste > General issues > Wastewater treatment and utilization
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