Impacts on water quality by in situ induced ozone‑oxygen oxidation in a polluted urban reservoir.

Autor: Tabla-Hernandez J; Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo (CIIEMAD), Instituto Politécnico Nacional (IPN), Calle 30 de Junio de 1520, Barrio La Laguna Ticomán, Municipio Gustavo A. Madero, C.P. 07340 Ciudad de México, CDMX, Mexico., Hernandez-Ramirez AG; Escuela Nacional de Ciencias Biológicas (ENCB), Instituto Politécnico Nacional (IPN), Prolongación de Carpio y Plan de Ayala S/N, Miguel Hidalgo, Santo Tomas C.P. 07738, CDMX, Mexico., Martinez-Tavera E; UPAEP Universidad, 21 sur no. 1103 Barrio de Santiago, Puebla C.P.72410, Mexico. Electronic address: estefania.martinez@upaep.mx., Rodriguez-Espinosa PF; Centro Interdisciplinario de Investigaciones y Estudios sobre Medio Ambiente y Desarrollo (CIIEMAD), Instituto Politécnico Nacional (IPN), Calle 30 de Junio de 1520, Barrio La Laguna Ticomán, Municipio Gustavo A. Madero, C.P. 07340 Ciudad de México, CDMX, Mexico., Mangas-Ramírez E; Facultad de Ciencias Biológicas, Benemérita Universidad Autónoma de Puebla. Av. San Claudio y 14 sur C.U. Edificio Bio-1. Col. San Manuel, Puebla, C.P. 72560 Puebla, Mexico.
Jazyk: angličtina
Zdroj: The Science of the total environment [Sci Total Environ] 2020 Sep 15; Vol. 735, pp. 139364. Date of Electronic Publication: 2020 May 13.
DOI: 10.1016/j.scitotenv.2020.139364
Abstrakt: The results of the successful implementation of a treatment based on the injection of ozone (O 3 ) and oxygen (O 2 ) into a contaminated body of water are reported for the first time. Three decontaminating units (SCAVENGER™), which have the capacity to inject up to 120 g O 3 /h and 250 Kg O 2 /h in the form of microbubbles (90 ± 10 μm in diameter), were placed in the contaminated Valsequillo reservoir, Central Mexico. In order to evaluate the efficacy of the treatment, 20 physicochemical parameters, 18 organic compounds, 66 inorganic compounds and 11 biological indicators were measured before, during and after the treatment; all of them in several representative sites of the east side of the Valsequillo reservoir. After 5 months of operating the SCAVENGER™ units in the eastern part of the reservoir, the concentration of Dissolved Oxygen (DO) increased 68%. Likewise, the chemical reducing conditions of the reservoir reflected by the low oxidation-reduction potential (ORP; -237 ± 75 mV) became quasi-oxidant (10 ± 58 mV). The treatment was efficient in water disinfection, presenting an 80% reduction in Fecal Coliforms (FC). Some heavy metals also showed a decrease in their concentration, being as follows: Al (65%), Cr (35%), Pb (46%), Zn (60%), Mn (20%), Mo (40%), Fe (32%), As (58%) and Co (26%). Due to the selective reactivity of ozone towards aliphatic and aromatic unsaturated compounds, several organic compounds reduced in their concentration by up to two orders of magnitude. Based on the above, it is evident that the treatment with ozone and oxygen was effective in substantially improving the quality of water in the east side of the Valsequillo reservoir.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2020 Elsevier B.V. All rights reserved.)
Databáze: MEDLINE
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