Ozone-driven processes for mature urban landfill leachate treatment : Organic matter degradation, biodegradability enhancement and treatment costs for different reactors configuration
Copyright © 2020 Elsevier B.V. All rights reserved..
In this work, the application of ozone-driven processes for the treatment of mature landfill leachate was investigated by testing different system setups. As a first approach, ozonation (O3-only) was tested, using a porous ceramic diffuser combined with a bubble column (BC), and the best operational conditions were established for leachate treatment (initial pH = 9.0; inlet ozone dose = 18 mg O3/min). Then, a novel photoreactor (FluHelik) was coupled in series with the bubble column, using a diffuser or a Venturi to inject ozone into the fluid stream. The FluHelik/BC-Venturi setup led to the highest efficiency, treating 50% more leachate than BC-alone using the same ozone dose and reaction time (3 h). Following, the oxidation ability of ozone combined with H2O2 and/or UVC for leachate treatment was assessed. The highest synergistic effect was obtained for the O3/UVC process, with pseudo-first-order rate constant for DOC and COD removal, 2.0 and 1.4 times higher than for the O3-only, respectively. Ozone-driven processes considerably enhanced the leachate biodegradability from 17% to 79% (O3/H2O2), 81% (O3-only), 85% (O3/H2O2/UVC) and 91% (O3/UVC), after a 3 h reaction period. With FluHelik/BC-Venturi system, the O3/UVC process stands out as the most efficient and cost-effective (6.0 €/m3), ensuring an effluent that meets discharge legal limit for COD (150 mg/L) after further biological oxidation.
| Medienart: |
E-Artikel |
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| Erscheinungsjahr: |
2020 |
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| Erschienen: |
2020 |
| Enthalten in: |
Zur Gesamtaufnahme - volume:724 |
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| Enthalten in: |
The Science of the total environment - 724(2020) vom: 01. Juli, Seite 138083 |
| Sprache: |
Englisch |
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| Beteiligte Personen: |
Gomes, Ana I [VerfasserIn] |
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| Links: |
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| Themen: |
66H7ZZK23N |
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| Anmerkungen: |
Date Completed 10.07.2020 Date Revised 10.07.2020 published: Print-Electronic Citation Status MEDLINE |
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| doi: |
10.1016/j.scitotenv.2020.138083 |
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| funding: |
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| Förderinstitution / Projekttitel: |
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| PPN (Katalog-ID): |
NLM309912253 |
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| 245 | 1 | 0 | |a Ozone-driven processes for mature urban landfill leachate treatment |b Organic matter degradation, biodegradability enhancement and treatment costs for different reactors configuration |
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| 520 | |a Copyright © 2020 Elsevier B.V. All rights reserved. | ||
| 520 | |a In this work, the application of ozone-driven processes for the treatment of mature landfill leachate was investigated by testing different system setups. As a first approach, ozonation (O3-only) was tested, using a porous ceramic diffuser combined with a bubble column (BC), and the best operational conditions were established for leachate treatment (initial pH = 9.0; inlet ozone dose = 18 mg O3/min). Then, a novel photoreactor (FluHelik) was coupled in series with the bubble column, using a diffuser or a Venturi to inject ozone into the fluid stream. The FluHelik/BC-Venturi setup led to the highest efficiency, treating 50% more leachate than BC-alone using the same ozone dose and reaction time (3 h). Following, the oxidation ability of ozone combined with H2O2 and/or UVC for leachate treatment was assessed. The highest synergistic effect was obtained for the O3/UVC process, with pseudo-first-order rate constant for DOC and COD removal, 2.0 and 1.4 times higher than for the O3-only, respectively. Ozone-driven processes considerably enhanced the leachate biodegradability from 17% to 79% (O3/H2O2), 81% (O3-only), 85% (O3/H2O2/UVC) and 91% (O3/UVC), after a 3 h reaction period. With FluHelik/BC-Venturi system, the O3/UVC process stands out as the most efficient and cost-effective (6.0 €/m3), ensuring an effluent that meets discharge legal limit for COD (150 mg/L) after further biological oxidation | ||
| 650 | 4 | |a Journal Article | |
| 650 | 4 | |a Biodegradability | |
| 650 | 4 | |a Gas-liquid devices | |
| 650 | 4 | |a Ozonation | |
| 650 | 4 | |a Ozone-based AOPs | |
| 650 | 7 | |a Water Pollutants, Chemical |2 NLM | |
| 650 | 7 | |a Ozone |2 NLM | |
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| 650 | 7 | |a Hydrogen Peroxide |2 NLM | |
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| 700 | 1 | |a Silva, Tânia F C V |e verfasserin |4 aut | |
| 700 | 1 | |a Boaventura, Rui A R |e verfasserin |4 aut | |
| 700 | 1 | |a Vilar, Vítor J P |e verfasserin |4 aut | |
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