Journal
WASTE MANAGEMENT
Volume 77, Issue -, Pages 466-476Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.wasman.2018.04.031
Keywords
Organic matter; Organic compounds; Supercritical oxidation; Ozone; AOP; ScWO
Categories
Funding
- Araucaria Foundation of Supports Scientific and Technological Development in the State of Parana (FAPPR)
- Coordination for the Improvement of Higher Education Personnel (CAPES)
- Funding Authority for Studies and Project (FINEP)
Ask authors/readers for more resources
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 degrees C, 23 MPa, and spatial time (tau) from 29 to 52 s. A combination of ozonation (30 min) and supercritical water oxidation process (03-30'/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 (BOD5.20) (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. (C) 2018 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available