Tripathi, Pranav K and Rao, N N and Chauhan, Chauhan and Pophali, G R and Kashyap, S M and Lokhande, S K and Gan, Lihua (2013) Treatment of refractory nano-filtration reject from a tannery using Pd – catalysed wet air oxidation. Journal of Hazardous Materials, 261. pp. 63-71. ISSN 0304-3894, ESSN: 1873-3336

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tWe attempted catalytic wet air oxidation (CWAO) of nanofiltration (NF)-reject using Pd based catalyst viz.,Pd/activated charcoal (AC) and PdCl2with the objective of degradation of refractory organic pollutants.Refractory organic pollutants in NF-reject before and after WAO and CWAO were confirmed by GC–MSanalysis. Experiments were conducted to investigate the effects of temperature, catalyst dosage andair partial pressure on the rate of removal of total organic carbon (TOC). The reaction kinetics can beconveniently described by considering two-stage first order kinetics. The use of Pd/AC afforded 85% TOCremoval, the corresponding rate constant (k) was 2.90 ± 0.075 × 10−3min−1(Pd/AC, 100 mg/L; T, 473.15 K;Pair, 0.69 MPa). On the other hand, 75% TOC was removed with k = 2.31 ± 0.075 × 10−3min−1using Pd2+catalyst (Pd2+, 16.66 mg/L; T, 473.15 K; Pair, 0.69 MPa). The observed rate of mineralization under Pd-catalyzed conditions was significantly higher than that of the uncatalyzed oxidation (41%) under thesimilar experimental conditions. Catalyst stability experiments were performed and TEM, SEM, XRD,Raman and XPS characterization data collected. Despite some morphological transformation of support,Pd catalyst was stable under CWAO conditions.

Item Type: Article
Uncontrolled Keywords: Catalytic Wet Air Oxidation; Palladium Catalysts; Nanofiltration-reject; Refractory Organic Pollutants; Tannery Effluen
Subjects: Industrial wastewater Characteristics
Industrial Wastewater Treatment & Disposal
Date Deposited: 03 May 2017 07:28
Last Modified: 03 May 2017 07:28

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