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Fate of aniline and sulfanilic acid in UASB bioreactors under denitrifying cond...

Two upflow anaerobic sludge blanket (UASB) reactors were operated to investigate the fate of aromatic amines under denitrifying conditions. The feed consisted of synthetic wastewater containing aniline and/or sulfanilic acid and a mixture of volatile fatty acids (VFA) as the primary electron donors. Reactor 1 (R1) contained a stoichiometric concentration of nitrate and Reactor 2 (R2) a stoichiometric nitrate an...

Thermal modification of activated carbon surface chemistry improves its capacit...

The surface chemistry of a commercial AC (AC0) was selectively modified, without changing significantly its textural properties, by chemical oxidation with HNO3 (ACHNO3 ) and O2 (ACO2 ), and thermal treatments under H2 (ACH2) or N2 (ACN2 ) flow. The effect of modified AC on anaerobic chemical dye reduction was assayed with sulphide at different pH values 5, 7 and 9. Four dyes were tested: Acid Orange 7, Reactiv...

Impact and application of electron shuttles on the redox (bio)transformation of...

During the last two decades, extensive research has explored the catalytic effects of different organic molecules with redox mediating properties on the anaerobic (bio)transformation of a wide variety of organic and inorganic compounds. The accumulated evidence points at a major role of electron shuttles in the redox conversion of several distinct contaminants, both by chemical and biological mechanisms. Many m...

Activated carbon as a redox mediator on azo dye reduction : influence of surfac...

Control of sulphide during anaerobic treatment of S-containing wastewaters by a...

Sulphide generated during anaerobic treatment of S-containing wastewaters represents an environmental problem. Adding limited amounts of oxygen or nitrate (or nitrite) to biologically (or chemically) oxidise sulphide forms a simple process level strategy to control this problem. This short review evaluates the feasibility and limitations of this strategy on the basis of the results of bioreactor studies. ; Sul...

Photocatalytic and combined anaerobic–photocatalytic treatment of textile dyes

Photocatalytic process based on immobilized titanium dioxide was used to treat crude solutions of azo, anthraquinone and phthalocyanine textile dyes. In addition, the process was applied to the treat autoxidized chemically reduced azo dyes, i.e. representatives of recalcitrant dye residues after biological sequential anaerobic–aerobic treatment. Photocatalysis was able to remove more than 90% color from crude a...

Fate of aniline and sulfanilic acid under denitrifying conditions

Bioreactor treatment of aromatic amines under denitrifying conditions

Biodegradability of reduced azo dyes : exploring the second stage of sequential...

Sequential anaerobic-aerobic treatment is the most logical biological strategy for the removal of azo dyes from wastewater. In the anaerobic stage, azo dyes, which generally resist aerobic biodegradation, are fortuitously reduced under anaerobic conditions, yielding colorless aromatic amines. In the aerobic stage, aromatic amines, which generally do not undergo further transformation under anaerobic conditions,...

Biodegradability of reduced azo dyes : exploring the second stage of sequential...

Sequential anaerobic-aerobic treatment is the most logical biological strategy for the removal of azo dyes from wastewater. In the anaerobic stage, azo dyes, which generally resist aerobic biodegradation, are fortuitously reduced under anaerobic conditions, yielding colorless aromatic amines. In the aerobic stage, aromatic amines, which generally do not undergo further transformation under anaerobic conditions,...