The mineralisation of methamidophos using ionised AN air water treatment pilot system and ultraviolet irradiation
| Autor: | Dang Quang Hung, Wolfram Thiemann, Jens Wohlers |
|---|---|
| Rok vydání: | 2002 |
| Předmět: |
Time Factors
Environmental Engineering Ultraviolet Rays Kinetics Ion chromatography chemistry.chemical_element Pilot Projects medicine.disease_cause Gas Chromatography-Mass Spectrometry Water Purification chemistry.chemical_compound Reaction rate constant medicine Animals Waste Management and Disposal Water Science and Technology Civil and Structural Engineering Air Ionization Minerals Chromatography Ecological Modeling Methamidophos Organothiophosphorus Compounds Chromatography Ion Exchange Pollution Mercury (element) Daphnia chemistry Air water Water treatment Oxidation-Reduction Ultraviolet Nuclear chemistry |
| Zdroj: | Water Research. 36:2959-2966 |
| ISSN: | 0043-1354 |
| Popis: | The degradation of methamidophos in pure bi-distilled water (with initial concentration 5 mg L(-1), pH = 7 at the beginning) was studied. For the first time, 2 ionised air water treatment pilot systems (IAPS-1, -2, no additives) were set up (Figs. 1 and 2). The degradation of methamidophos was carried out with only the IAPS-2 and with two different ultraviolet (UV) lamps: high- and low-pressure mercury lamps (HP and LP, with or without H202). The kinetics of these oxidative processes was investigated. The highest rate constant was reached by the LP, 0.2% H2O2 (k = 0.7524min(-1), t 1/2 = 0.9min), followed closely by both treatments with the HP, 0.2% H202 (k = 0.6328min(-1), t 1/2 = 1.1 min) and LP, 0% H202 (k = 0.4749min(-1), t 1/2 = 1.5 min). The lowest rate constants were achieved from the HP, 0% H202 process (k = 0.0303min(-1), t 1/2 = 22.9min) and from the IAPS-2 (k = 0.0117 min(-1), t 1/2 = 59.2min). The mineralisation of methamidophos was confirmed by the determination of the anions produced including NO3-, PO4(3-) and SO4(2-) during and at the end of each experiment. The toxicity of water samples before, during and after the experiments was tested with Daphnia test. |
| Databáze: | OpenAIRE |
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