| Name: | Description: | Size: | Format: | |
|---|---|---|---|---|
| 1.69 MB | Adobe PDF |
Advisor(s)
Abstract(s)
Matured compost, derived from a mechanical and biological treatment (MBT) plant, was
used as a precursor to produce catalysts through hydrothermal and thermal carbonization, HC and
PC, respectively. HC and PC displayed suitable properties to act as catalysts in the catalytic wet
peroxide oxidation (CWPO) treatment of the highly polluted leachate waters generated in the same
MBT plant (TOC0 = 27 g L-1; COD0 = 60 g L-1; BOD5,0 = 23 g L-1). The influence of catalyst loading
and pH were studied, considering multiple additions of H2O2. The best experimental conditions
found were T = 80º C, pH0 = 3.0, 7.2 g L-1 of HC catalyst, 85.7 g L-1 of H2O2, added in five batches
in one-hour intervals between each addition. Under these experimental conditions, removals of 43%,
52%, 93%, 82%, 35%, 95% and 93% for the COD, TOC, BOD5, aromaticity, chlorides, turbidity and
color number (CN) were, respectively, observed. Ion exchange resins and coagulation–flocculation
were studied as pretreatment options to reduce the complexity of the leachate waters and enhance
the CWPO results. Both strategies resulted in higher mineralization and enhanced the consumption
efficiency of H2O2 (H2O2 ). The sequential treatment using coagulation–flocculation and CWPO with
PC catalyst showed the best results, achieving abatement of 94%, 70%, 98%, 93%, 31%, 96% and 95%
for COD, TOC, BOD5, aromaticity, chlorides, turbidity and CN, respectively.
Description
Keywords
Citation
Batista, Gabriel de Freitas; Roman, Fernanda F.; Diaz de Tuesta, Jose L.; Mambrini, Raquel Vieira; Praça, Paulo; Gomes, Helder (2022). Assessment of pretreatments for highly concentrated leachate waters to enhance the performance of catalytic wet peroxide oxidation with sustainable low-cost catalysts. Catalysts. ISSN 2073-4344. 12:2, p. 1-17