Title

Removal of reactive azo dyes from water by zero-valent iron reduction followed by peroxidase-catalyzed polymerization.

Date of Award

2004

Degree Type

Thesis

Degree Name

M.A.Sc.

Department

Civil and Environmental Engineering

First Advisor

Bewtra, J. K.,

Keywords

Engineering, Civil.

Rights

CC BY-NC-ND 4.0

Abstract

Removing reactive azo dyes from textile wastewater is a significant challenge due to their color, non-biodegradability and toxicity. Although various treatment methods are available, it was hypothesized that reduction by zero-valent Fe followed by enzymatic treatment could be an environmentally friendly and cost effective approach. Zero-valent Fe cleaves the azo bond, reducing the dyes to aromatic amines, which are then oxidized and polymerized by enzymatic treatment. Finally, these polymers are removed by coagulant (PEI) aided sedimentation and filtration. The effectiveness of zero-valent Fe and Arthromyces ramosus peroxidase (ARP) treatment in the proposed process were studied on two representative reactive azo dyes, Reactive Red 2 (RR2) and Reactive Black 5 (RB5). To gain insight into ARP action on these two dyes, two model compounds, diphenylamine (DPA) and 2-amino-8-naphthol-3,6-disulfonic acid (ANDSA) were studied. A comparison with other treatment methods asserted the superior advantage of the proposed process in terms of actual pollutant and colour removal. (Abstract shortened by UMI.) Source: Masters Abstracts International, Volume: 43-03, page: 0919. Advisers: J. K. Bewtra; K. E. Taylor. Thesis (M.A.Sc.)--University of Windsor (Canada), 2004.