Journal of Food, Agriculture and Environment

A strain decolourizing Reactive Red X-3B and its performance study

Author(s):

Wenwei Tang ¹*, Jiemin Gong ¹, Min Zhang  ², Chang Li ², Xinping Zeng ²

Recieved Date: 2013-07-08, Accepted Date: 2013-10-10

Abstract:

Among all increasing production of synthetic dyes, azo dye is one kind of synthetic dyes that have the highest yield. In the process of production and application of dyes, a large amount of dye wastewater will be generated and cause serious contamination to the environment. Biological treatment of dye wastewater is low-cost and environment-friendly. However, the processing efficiency of traditional biological treatment is always low. New biological technology such as bacteria immobilising, genetically engineered bacteria technology, etc. show very high research value and application potential. However, they are all based on the study of high efficient decolourisation bacteria screening, which becomes the focus of research. In this paper, the acclimation, culturing, screening and identification of a strain efficiently decolourising Reactive Red X-3B were carried out from activated sludge in a dye plant, then impacts of the environment (carbon source, nitrogen source, pH, temperature, etc.) on its decolourising performance were discussed. R1 was identified as Pseudomonas aeruginosa by 16SrDNA. Its decolourisation rate of Reactive Red X-3B, Reactive Black K-N and Reactive Orange X was 80.53%, 70.20% and 76.58%, respectively. Interestingly, it seemed that the strain could utilise the dye as sole carbon source for growth and reproduction, supported by another result that extra glucose suppressed the decolourisation process. The cultural conditions have been optimised at pH 7.5, 37°C, 10 g/L (NH₄)₂SO₄ addtion and 5% inoculum where the decolourisation rate increased by 9.1% and reached 89.6%. In the logarithmic phase, the decolourisation rate was proportional to reaction time and the remaining dye concentration in the medium existed the following relationships with reaction time: ln(C₀/C) = 0.1141t − 1.2168 (R² = 0.9295).

Keywords:

Dye wastewater, azo-dye, bacteria decolourisation, Pseudomonas aeruginosa, carbon source, nitrogen source, pH, temperature, inoculum

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Journal: Journal of Food, Agriculture and Environment
Year: 2013
Volume: 11
Issue: 3&4
Category: Environment
Pages: 1592-1595

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