Combined processes of ozonation and supercritical water oxidation for landfill leachate degradation.

Autor: Scandelai APJ; Department of Chemical Engineering, Universidade Estadual de Maringá, Avenida Colombo, 5790, Jd. Universitário, 87020-900 Maringá, Paraná, Brazil. Electronic address: paulascandelai@hotmail.com., Cardozo Filho L; Department of Chemical Engineering, Universidade Estadual de Maringá, Avenida Colombo, 5790, Jd. Universitário, 87020-900 Maringá, Paraná, Brazil. Electronic address: lcfilho@uem.br., Martins DCC; Department of Chemical Engineering, Universidade Estadual de Maringá, Avenida Colombo, 5790, Jd. Universitário, 87020-900 Maringá, Paraná, Brazil. Electronic address: daniellyccampos@gmail.com., Freitas TKFS; Department of Chemical, Universidade Estadual de Maringá, Avenida Colombo, 5790, Jd. Universitário, 87020-900 Maringá, Paraná, Brazil. Electronic address: thabata.karoliny@gmail.com., Garcia JC; Department of Chemical, Universidade Estadual de Maringá, Avenida Colombo, 5790, Jd. Universitário, 87020-900 Maringá, Paraná, Brazil. Electronic address: jcgmoraes@uem.br., Tavares CRG; Department of Chemical Engineering, Universidade Estadual de Maringá, Avenida Colombo, 5790, Jd. Universitário, 87020-900 Maringá, Paraná, Brazil. Electronic address: crgtavares@uem.br.
Jazyk: angličtina
Zdroj: Waste management (New York, N.Y.) [Waste Manag] 2018 Jul; Vol. 77, pp. 466-476. Date of Electronic Publication: 2018 Apr 25.
DOI: 10.1016/j.wasman.2018.04.031
Abstrakt: Leachate is a highly variable, heterogeneous and recalcitrant wastewater generated in landfills which may contain high concentrations of many organic and inorganic compounds, hampering the application of a single technique in its treatment. Therefore, this paper assessed leachate degradation through supercritical water oxidation (ScWO) as well as combined processes of ozonation and supercritical water oxidation (O 3 /ScWO and ScWO/O 3 ), a yet innovative combination. Ozonation was carried out at different reaction times (30-120 min). ScWO was developed at 600 °C, 23 MPa, and spatial time (τ) from 29 to 52 s. A combination of ozonation (30 min) and supercritical water oxidation process (O 3 -30'/ScWO) was the most efficient technique for the degradation of the leachate assessed. These conditions enabled to remove high values of apparent and true color (92% and 97%, respectively), biochemical oxygen demand (BOD 5,20 ) (95%), chemical oxygen demand (COD) (92%), total organic carbon (TOC) (79%), nitrite (78%), nitrate (84%), total (96%), dissolved (96%) and suspended (94%) solids. In addition, the combined process presented significant decrease in electric conductivity (EC) (68%) and less leachate turbidity removal (43%). Except for ammonia and nitrite, all parameters of the leachate treated by O 3 -30'/ScWO met the specifications of Brazilian legislation (CONAMA Resolutions No. 357/2005 and No. 430/2011) for the disposal of wastewater in water bodies. Besides, both processes are considered to be clean technologies. This shows the great possibility of applying the O 3 /ScWO combination to landfills leachates.
(Copyright © 2018 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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