Comparison of catalyzed and noncatalyzed oxidation of azo dye and effects on biodegradability

Article Abstract:

Biodegradability is perceived to be heavily reliant on intermediate product distribution. Any solution affected by catalytic oxidation is believed to be more accepting of aerobic biodegradation due to the smaller amounts of intermediate products created via this process. This conclusion is pertinent to the study of the biodegradability of waste streams being emitted by industrial systems, with aerobic biodegradability determined by considering the BOD, COD and TOC values per stream. Noncatalytic and catalytic oxidation results per the aerobic biodegradability of Orange II aqueous formulations are shown by the data.

Cyclic crudes and intermediates, Azoic Dyes & Components, Synthetic Organic Dye and Pigment Manufacturing, Analysis, Biodegradation, Azo dyes, Azo compounds

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Oxidation of As(III) by synthetic birnessite

Article Abstract:

The rates and mechanisms of the reactions of As(III) with synthetic birnessite particles were investigated. The results showed that the depletion of As(III) from the solution was rapid when the pH level was at 4. The release rate of the reduction product Mn(II) was slightly slower but that of As(V) was almost at the same rapid rate. The amount of dissolved oxygen did not influence the reaction rate.

Arsenic

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Catalytic supercritical water oxidation: phenol conversion and product selectivity

Article Abstract:

The role of a heterogeneous catalyst in the supercritical water oxidation of phenol, a common pollutant in wastewater stream, is analyzed. A simple kinetic model was used to describe the formation of carbon dioxide as an intermediate product during the conversion of phenol. Experimental results were analyzed according to rate constants of the reaction pathways.

Catalysts, Phenols, Phenols (Class of compounds)

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