Text Box: Environment & We 
An International Journal of Science & Technology
 ISSN: 0975-7112 (Print) 				ISSN: 0975-7120 (Online)

Volume 14, Number 2

July-December  2019

Environ. We Int. J. Sci. Tech. 14 (2019) 159-168                            Full Paper

Effect of some Organic co-pollutants on Decolorization of Reactive Violet 1 dye by an Indigenous Microbial Strain from Textile Wastewater

 

Yogita Prabhakar#, Anshu Gupta$, Anubha Kaushik*

University School of Environment Management,

Guru Gobind Singh Indraprastha University, New Delhi-110078, India.

#Email Id: 1yogita18dec@gmail.com, $anshurcy@yahoo.in

*Email: akaushik@ipu.ac.in  Phone No.: + 91-9654947305 Fax: 91-11-25302111

 

Abstract

 

 Textile wastewaters contain substantial concentration of dyes, salts, organic chemicals and solvents. The dyes not only deteriorate water quality due to color, but also adversely affect aquatic food chain and human beings due to their toxicity. Bioremediation of dyes using suitable microbes is an environment friendly approach. However, bioremediation potential is sometimes affected due to the presence of other pollutants in the wastewater. The present study reports the effect of some common solvents of textile industry (toluene, formaldehyde and acetic acid) on decolorization of toxic and recalcitrant Reactive violet 1 dye. Indigenous bacterium isolated from textile wastewater Nesterenkonia lacusekhoensis was used in the study. The effect of each of the solvents (1% conc.) was studied on dye degradation (100 mg/l dye concentration) under static condition by studying bacterial growth and dye decolorization. The results showed variable effects of solvents on the growth of the bacterium. While no growth was observed in the reaction mixture containing formaldehyde, the microbe was able to grow and remediate the dye in the presence of toluene and acetic acid. Bacterial growth was however, better in the presence of the dye when other solvents are absent. Decolorization was 96.8% when dye alone was used, while it was somewhat reduced in the presence of toluene (70.6%) and acetic acid (82.3%). The study shows that while the microbe has excellent capability to decolorize the RV 1 dye, it can also grow and degrade the dye quite efficiently in the presence of co-pollutants like toluene and acetic acid, which are present in textile wastewater.

 

Keywords: Reactive dye; Organic solvents; Textile wastewater; Dye decolorization; Bacterial growth