An integrated biodegradation and nano-oxidation used for the remediation of naphthalene from aqueous solution. (December 2015)

• Record Type: Journal Article
• Authors: Yu, Bing; Jin, Xiaoying; Kuang, Ye; Megharaj, Mallavarapu; Naidu, Ravendra; Chen, Zuliang
• Is Part Of: Chemosphere. Volume 141(2015)
• Page Start: 205
• Page End: 211
• Publication Date: 2015-12
• Subjects: Biodegradation -- Naphthalene -- Fenton-like oxidation -- Hydroxyl radical -- nZVI; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2015.07.050
• Languages: English
• ISSNs: 0045-6535

Abstract

Highlights: Naphthalene remediation integrates biodegradation and Fenton-like oxidation. Removal of COD increased from 36.4% to 91.6% by Fe nanoparticles. Naphthalene transformation products were completely mineralized. This method has great potential for naphthalene remediation. Abstract: The remediation of toxic persistent organic contaminants in the environment has raised a need for effective cleanup methods. In this study, an integrated remediation technique based on biodegradation of naphthalene using Bacillus fusiformis and Fenton oxidation of their degraded metabolites using nanoscale zero-valent iron (nZVI). A 99.0% naphthalene was biodegraded by B . fusiformis in 96 h, while only 59.4% chemical oxygen demand (COD) was removed, indicating that the degraded metabolites existed in solution. To further degrade the metabolites, nanoscale zero-valent iron (nZVI) was used as heterogeneous catalyst for Fenton-like oxidation of the metabolites after biodegradation lasting 40 h. Results showed that the total the removal COD increased from 36.4% to 91.6% at pH 3.0, 1.0 g L −1 nZVI, 10.0 mM L −1 H2 O2 and temperature of 35 °C. Scanning electron microscopy (SEM) showed the aggregation and corrosion of nZVI. X-ray diffraction (XRD) confirmed the existence of Fe 0 and the presence of iron oxide (Fe(II)) and iron oxohydroxide (Fe(III)). A possible degradation pathway was proposed since two naphthalene metabolites (1-Naphthalenol and 1, 4-Naphthalenedione) were detected by GC–MS.