Combining Coagulation and Electrocoagulation with UVA-LED Photo-Fenton to Improve the Efficiency and Reduce the Cost of Mature Landfill Leachate Treatment

This study focused on the reduction of the treatment cost of mature landfill leachate (LL) by enhancing the coagulation pre-treatment before a UVA-LED photo-Fenton process. A more efficient advanced coagulation pretreatment was designed by combining conventional coagulation (CC) and electro-coagulat...

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Autores principales:	Javier Tejera, Daphne Hermosilla, Antonio Gascó, Carlos Negro, Ángeles Blanco
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	wastewater treatment recalcitrant compounds sustainable technologies electrocoagulation landfill leachate bio-degradability enhancement Organic chemistry QD241-441
Acceso en línea:	https://doaj.org/article/297c37b7c7774e2388ef815e39ba4022
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spelling	oai:doaj.org-article:297c37b7c7774e2388ef815e39ba40222021-11-11T18:26:35ZCombining Coagulation and Electrocoagulation with UVA-LED Photo-Fenton to Improve the Efficiency and Reduce the Cost of Mature Landfill Leachate Treatment10.3390/molecules262164251420-3049https://doaj.org/article/297c37b7c7774e2388ef815e39ba40222021-10-01T00:00:00Zhttps://www.mdpi.com/1420-3049/26/21/6425https://doaj.org/toc/1420-3049This study focused on the reduction of the treatment cost of mature landfill leachate (LL) by enhancing the coagulation pre-treatment before a UVA-LED photo-Fenton process. A more efficient advanced coagulation pretreatment was designed by combining conventional coagulation (CC) and electro-coagulation (EC). Regardless of the order in which the two coagulations were applied, the combination achieved more than 73% color removal, 80% COD removal, and 27% SUVA removal. However, the coagulation order had a great influence on both final pH and total dissolved iron, which were key parameters for the UVA-LED photo-Fenton post-treatment. CC (pH = 5; 2 g L<sup>−1</sup> of FeCl<sub>3</sub>6H<sub>2</sub>O) followed by EC (pH = 5; 10 mA cm<sup>−2</sup>) resulted in a pH of 6.4 and 100 mg L<sup>−1</sup> of dissolved iron, whereas EC (pH = 4; 10 mA cm<sup>−2</sup>) followed by CC (pH = 6; 1 g L<sup>−1</sup> FeCl<sub>3</sub>6H<sub>2</sub>O) led to a final pH of 3.4 and 210 mg L<sup>−1</sup> dissolved iron. This last combination was therefore considered better for the posterior photo-Fenton treatment. Results at the best cost-efficient [H<sub>2</sub>O<sub>2</sub>]:COD ratio of 1.063 showed a high treatment efficiency, namely the removal of 99% of the color, 89% of the COD, and 60% of the SUVA. Conductivity was reduced by 17%, and biodegradability increased to BOD<sub>5</sub>:COD = 0.40. With this proposed treatment, a final COD of only 453 mg O<sub>2</sub> L<sup>−1</sup> was obtained at a treatment cost of EUR 3.42 kg COD<sup>−1</sup>.Javier TejeraDaphne HermosillaAntonio GascóCarlos NegroÁngeles BlancoMDPI AGarticlewastewater treatmentrecalcitrant compoundssustainable technologieselectrocoagulationlandfill leachatebio-degradability enhancementOrganic chemistryQD241-441ENMolecules, Vol 26, Iss 6425, p 6425 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	wastewater treatment recalcitrant compounds sustainable technologies electrocoagulation landfill leachate bio-degradability enhancement Organic chemistry QD241-441
spellingShingle	wastewater treatment recalcitrant compounds sustainable technologies electrocoagulation landfill leachate bio-degradability enhancement Organic chemistry QD241-441 Javier Tejera Daphne Hermosilla Antonio Gascó Carlos Negro Ángeles Blanco Combining Coagulation and Electrocoagulation with UVA-LED Photo-Fenton to Improve the Efficiency and Reduce the Cost of Mature Landfill Leachate Treatment
description	This study focused on the reduction of the treatment cost of mature landfill leachate (LL) by enhancing the coagulation pre-treatment before a UVA-LED photo-Fenton process. A more efficient advanced coagulation pretreatment was designed by combining conventional coagulation (CC) and electro-coagulation (EC). Regardless of the order in which the two coagulations were applied, the combination achieved more than 73% color removal, 80% COD removal, and 27% SUVA removal. However, the coagulation order had a great influence on both final pH and total dissolved iron, which were key parameters for the UVA-LED photo-Fenton post-treatment. CC (pH = 5; 2 g L<sup>−1</sup> of FeCl<sub>3</sub>6H<sub>2</sub>O) followed by EC (pH = 5; 10 mA cm<sup>−2</sup>) resulted in a pH of 6.4 and 100 mg L<sup>−1</sup> of dissolved iron, whereas EC (pH = 4; 10 mA cm<sup>−2</sup>) followed by CC (pH = 6; 1 g L<sup>−1</sup> FeCl<sub>3</sub>6H<sub>2</sub>O) led to a final pH of 3.4 and 210 mg L<sup>−1</sup> dissolved iron. This last combination was therefore considered better for the posterior photo-Fenton treatment. Results at the best cost-efficient [H<sub>2</sub>O<sub>2</sub>]:COD ratio of 1.063 showed a high treatment efficiency, namely the removal of 99% of the color, 89% of the COD, and 60% of the SUVA. Conductivity was reduced by 17%, and biodegradability increased to BOD<sub>5</sub>:COD = 0.40. With this proposed treatment, a final COD of only 453 mg O<sub>2</sub> L<sup>−1</sup> was obtained at a treatment cost of EUR 3.42 kg COD<sup>−1</sup>.
format	article
author	Javier Tejera Daphne Hermosilla Antonio Gascó Carlos Negro Ángeles Blanco
author_facet	Javier Tejera Daphne Hermosilla Antonio Gascó Carlos Negro Ángeles Blanco
author_sort	Javier Tejera
title	Combining Coagulation and Electrocoagulation with UVA-LED Photo-Fenton to Improve the Efficiency and Reduce the Cost of Mature Landfill Leachate Treatment
title_short	Combining Coagulation and Electrocoagulation with UVA-LED Photo-Fenton to Improve the Efficiency and Reduce the Cost of Mature Landfill Leachate Treatment
title_full	Combining Coagulation and Electrocoagulation with UVA-LED Photo-Fenton to Improve the Efficiency and Reduce the Cost of Mature Landfill Leachate Treatment
title_fullStr	Combining Coagulation and Electrocoagulation with UVA-LED Photo-Fenton to Improve the Efficiency and Reduce the Cost of Mature Landfill Leachate Treatment
title_full_unstemmed	Combining Coagulation and Electrocoagulation with UVA-LED Photo-Fenton to Improve the Efficiency and Reduce the Cost of Mature Landfill Leachate Treatment
title_sort	combining coagulation and electrocoagulation with uva-led photo-fenton to improve the efficiency and reduce the cost of mature landfill leachate treatment
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/297c37b7c7774e2388ef815e39ba4022
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Combining Coagulation and Electrocoagulation with UVA-LED Photo-Fenton to Improve the Efficiency and Reduce the Cost of Mature Landfill Leachate Treatment

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