| Author: | Zhou, Ruiqi |
| Title: | Photodegradation of sulfadiazine in the peroxymonosulfate/UV system in water solution and real effluent and affecting factors |
| Advisors: | Chu, Wei (CEE) |
| Degree: | M.Sc. |
| Year: | 2017 |
| Subject: | Hong Kong Polytechnic University -- Dissertations Photodegradation Biotechnology -- Environmental aspects |
| Department: | Faculty of Construction and Environment |
| Pages: | vi, 54 pages : illustrations |
| Language: | English |
| Abstract: | Mechanism of photodegradation of sulfonamide antimicrobial compounds using various UV/oxidant methods has been studied. However, research records on the degradation performance of sulfadiazine in the peroxymonosulfate-UV system are rarely to be found. In this study, photodegradation behavior of sulfadiazine using peroxymonosulfate as oxidant under 254nm UV lights in aqueous solution was investigated. Effects of various factors including pH, SDZ concentration, ratio of PMS:SDZ, different concentrations of common anions exist in effluent, humic acid concentration and real effluent were examined. The degradation reaction was found to follow well the first-order kinetics model, so results of experiments were mainly presented through three types of figures: C/C0-time, ln(C/C0) and k(reaction rate coefficient)-time. Degradation speed of SDZ in UV/PMS system was significantly accelerated compared to single factor reaction with UV or PMS only. Under condition of pH 9.5, 0.03 mM SDZ, ratio of PMS:SDZ=12.5:1, could provide fast reaction speed, suitable observation and sampling time, so it is chosen as the optimal condition and used as basic condition in following experiments. Chloride had dual effects to the reaction: inhibitory effect from 5 to 6000ppm; accelerating effect over 6000ppm. Nitrate (NO₃ˉ), sulfate (SO₄²ˉ) and phosphate (PO₄³ˉ) performed similar slight inhibitory effects to the degradation reaction. Due to the formation of bromine radical species (BRS) bromide had slight stimulative effect at low concentrations and significantly accelerating effect at high concentrations to the reaction system. Carbonate ions had little effect to the system within the designed concentrations. Nitrite (NO₂ˉ) and humic acid acted as strong quenchers to the oxidation system compared to the effects of other ions. Reactions happened in effluent were also slowed down by complex constituents (mainly high concentration of chloride ions and organic compounds) in the effluent. TOC results indicated that although UV/PMS system could effectively degrade SDZ, the removal efficiencies of TOC were much lower than that of SDZ. |
| Rights: | All rights reserved |
| Access: | restricted access |
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| File | Description | Size | Format | |
|---|---|---|---|---|
| 991022142755503411.pdf | For All Users (off-campus access for PolyU Staff & Students only) | 1.69 MB | Adobe PDF | View/Open |
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