Title

Sequential anaerobic-aerobic treatment of azo dyes: Decolourisation and amine degradability

Document Type

Journal Article

Faculty

Faculty of Computing, Health and Science

School

School of Natural Sciences / Centre for Ecosystem Management

RAS ID

12795

Comments

This article was originally published as: Jonstrup, M., Radhakrishnan, N. K., Murto, M., & Mattiasson, B. (2011). Sequential anaerobic-aerobic treatment of azo dyes: Decolourisation and amine degradability. Desalination, 280(1-3), 339-346. Original article available here

Abstract

The feasibility of sequential anaerobic–aerobic treatment for complete dye degradation was evaluated using three azo dyes, namely Remazol Red RR, Remazol Blue RR and Remazol Yellow RR. The robustness of the anaerobic treatment was investigated in biofilm reactors and the influences of carrier type, hydraulic retention time, dye concentration and dye type were studied. A decolourisation of 98% was obtained in the anaerobic reactors with Poraver carriers whilst decolourisation was slightly lower in the reactors with Kaldnes carriers, which could be attributed to differences in biofilm structure. Almost complete decolourisation could be achieved at dye concentrations between 100 and 2000 mg l− 1 even when the reactors were not adapted to the specific dye. The fate of the metabolites during aerobic treatment was followed; however, only partial degradation of the aromatic amines could be achieved. The metabolites from Remazol Yellow RR auto-oxidised upon exposure to aerobic conditions forming a product, which resisted further degradation. Additional batch tests were conducted using aerobic sludge from a textile and a chemical industry but neither of these inocula was able to completely degrade the recalcitrant amines. This shows the need of a post-treatment to be able to ensure complete amine degradation.

 

Link to publisher version (DOI)

10.1016/j.desal.2011.07.022