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How does the pre-treatment of landfill leachate impact the performance of O and O/UVC processes?
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Final Accepted Manuscript
Author
Gomes, Ana ISouza-Chaves, Bianca M
Park, Minkyu
Silva, Tânia F C V
Boaventura, Rui A R
Vilar, Vítor J P
Affiliation
Department of Chemical & Environmental Engineering, University of ArizonaIssue Date
2021-03-29Keywords
Biodegradabilitydissolved organic matter
Mature landfill leachate
Operating Costs
Ozonation
UVC radiation
Metadata
Show full item recordPublisher
Elsevier LtdCitation
Gomes, A. I., Souza-Chaves, B. M., Park, M., Silva, T. F., Boaventura, R. A., & Vilar, V. J. (2021). How does the pre-treatment of landfill leachate impact the performance of O3 and O3/UVC processes?. Chemosphere, 278, 130389.Journal
ChemosphereRights
Copyright © 2021 Elsevier Ltd. All rights reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
In this study, O3 and O3/UVC processes were evaluated for the treatment of landfill leachate after biological nitrification/denitrification, coagulation, or their combinations. The O3-driven stage efficiency was assessed by the removal of color, organic matter (dissolved organic carbon (DOC) and chemical oxygen demand (COD)), and biodegradability increase (Zahn-Wellens test). Also, fluorescence excitation-emission matrix (EEM) and size exclusion chromatography coupled with OC detector (SEC-OCD) analysis were carried out for each strategy. The bio-nitrified-leachate (LN) was not efficiently mineralized during the O3-driven processes since the high nitrites content consumed ozone rapidly. In turn, carbonate/bicarbonate ions impaired the oxidation of the bio-denitrified-leachate (LD), scavenging hydroxyl radicals (HO•) and inhibiting the O3 decomposition. For both bio-leachates, only O3/UVC significantly enhanced the effluent biodegradability (>70%), but COD legal compliance was not reached. EEM and SEC-OCD results revealed differences in the organic matter composition between the nitrified-coagulated-leachate (LNC) and denitrified-coagulated-leachate (LDC). Nonetheless, the amount of DOC and COD removed per gram of ozone was similar for both. Cost estimation indicates the O3-driven stage as the costliest among the treatment processes, while coagulation substantially reduced the cost of the following ozonation. Thus, the best treatment train strategy comprised LDC (with methanol addition for denitrification and coagulated with 300 mg Al3+/L, without pH adjustment), followed by O3/UVC (transferred ozone dose of 2.1 g O3/L and 12.2 kJUVC/L) and final biological oxidation, allowed legal compliance for direct discharge (for organic and nitrogen parameters) with an estimated cost of 8.9 €/m3 (O3/UVC stage counting for 6.9 €/m3).Note
24 month embargo; available online 29 March 2021ISSN
0045-6535EISSN
1879-1298PubMed ID
33845438Version
Final accepted manuscriptae974a485f413a2113503eed53cd6c53
10.1016/j.chemosphere.2021.130389