期刊
BIODEGRADATION
卷 26, 期 2, 页码 151-160出版社
SPRINGER
DOI: 10.1007/s10532-015-9723-8
关键词
Anaerobic treatment; Electric potential; Azo dye; Direct Black 22; Aromatic amines; Toxicity; Electrolysis; eAD
资金
- Brazilian agency CNPq [202290/2012-3]
- National Science Foundation through CAREER Grant [0939882]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [0939882] Funding Source: National Science Foundation
Azo dyes are the most widely used coloring agents in the textile industry, but are difficult to treat. When textile effluents are discharged into waterways, azo dyes and their degradation products are known to be environmentally toxic. An electrochemical system consisting of a graphite-plate anode and a stainless-steel mesh cathode was placed into a lab-scale anaerobic bioreactor to evaluate the removal of an azo dye (Direct Black 22) from synthetic textile wastewater. At applied potentials of 2.5 and 3.0 V when water electrolysis occurs, no improvement in azo dye removal efficiency was observed compared to the control reactor (an integrated system with electrodes but without an applied potential). However, applying such electric potentials produces oxygen via electrolysis and promoted the aerobic degradation of aromatic amines, which are toxic, intermediate products of anaerobic azo dye degradation. The removal of these amines indicates a decrease in overall toxicity of the effluent from a single-stage anaerobic bioreactor, which warrants further optimization in anaerobic digestion.
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