Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 176, Issue 1-3, Pages 213-219Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2009.11.015
Keywords
4-Nitrophenol; EDTA; Zero-valent iron; Microwave; Degradation; Biodegradability
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Funding
- State Key Laboratory of Pollution Control and Resource Reuse, China
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A microwave assisted zero-valent iron oxidation process was studied in order to investigate the synergetic effects of MW irradiation on Fe/EDTA system (Fe/EDTA/MW) treated 4-nitrophenol (4-NP) from aqueous solution. The results indicated that the thermal effect of microwave improved the removal effect of 4-NP and TOC through raising the temperature of the system, as well as the non-thermal effect generated by the interaction between the microwave and the Fe resulting in an increase in the hydrophobic character of Fe surface. During the degradation of 4-NP in Fe/EDTA/MW system, the optimum value for MW power, Fe. EDTA dosage was 400 W, 2 g and 0.4 mM, respectively. The possible pathway for degrading the 4-NP was proposed based on CC/MS and HPLC analysis of the degradation intermediates. The concentration change course of the main bio-refractory by-products, the aminophenol formed in the degradation of 4-NP suggested a more efficient degradation and mineralization in Fe/EDTA/MW system. Finally, BOD5/CODCr of the solution increased from 0.237 to 0.635 after reaction for 18 min, indicating that the biodegradability of wastewater was greatly improved by Fe/EDTA/MW system and would benefit to further treatment by biochemical methods. Crown Copyright (C) 2009 Published by Elsevier B.V. All rights reserved.
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