Pollution Research Paper

Vol.31, Issue 3, 2012; Page No.(465-469)

APPLICATION OF ADVANCED OXIDATION PROCESS FOR ACID BLACK DYE DEGRADATION

R. PRIYADHARSINI, P. RAJESH PRASANNA AND MS. CHITRA KALYANARAMAN

Abstract

Wastewater generated from tanneries is generally very complex in nature consisting of many organic and inorganic chemicals, and most of the organic chemicals are synthetic in nature and are difficult to biodegrade in existing conventional biological treatment systems. The synthetic organic chemicals like dyes, syntans and synthetic fat liquors etc. that are found in tannery wastewater are resistant to biodegradation. They tend to escape from the primary chemical treatment and cause problems in secondary biological treatment by reducing the degradation efficiencies of the microbes. Hence pre-treatment steps like Advanced oxidation processes (AOPs) are required to improve the biodegradability of wastewater in tanneries before biological treatment. Hydrogen peroxide oxidation and Fenton’s oxidation are applied here as pre-treatment steps for specific complex chemicals like acid black dye used in the tanneries to improve the biodegradability of the acid black dye under various operating conditions like pH, contact time, dose etc. Biodegradability of the dye was arrived at based on the COD and BOD obtained for the dye at the specific operating conditions. The results of the study indicated that the BOD/COD ratio of the dye increased from 0.215 to 0.288 at pH 3 with addition of 6mM H2O2 per litre and further the ratio increased to 0.4 with addition of 6mM H2O2 with 6 mg Fe per litre. Once the biodegradability is increased, it can be effectively removed in the biological treatment unit.

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