Abstract
An attempt was made to study the toxic nature of dye degraded product(s) which was degraded by previously isolated two potential strains namely Lysinibacillus sphaericus RSV-1 and stenotrophomonas maltophilia RSV-2. The phytotoxicity and cytotoxicity of degraded product(s) were tested on Triticum aestivum (co w) and human embryonic kidney cell line (HEK 293) respectively. Results revealed that the degraded product(s) was nontoxic in nature with respect to phytotoxicity as well as cytotoxicity study. Further the strains were utilized for the treatment of real textile dyewaste effluent and the result found that there was considerable reduction in Biological Oxygen Demand (BOD), Chemical Oxygen Demand (COD) and Total Organic Carbon (TOC) of real textile effluent. Therefore the strains could be effectively utilized for the treatment of real textile dye effluent having high concentration of reactive dyes.
Highlights
With the increased demand for textile products, the textile industry and its wastewater have been increasing proportionally, making it one of the main sources of severe pollution problems worldwide
Two potential strains namely Lysinibacillus sphaericus RSV1 and stenotrophomonas maltophilia RSV-2 were isolated from textile dyewaste effluent capable of decolorizing four different mixed reactive dyes namely Blue RR, Black B, Red RR and Yellow RR up to 2700mgl and 2100mg-l respectively with 50-60 percent decolorization within 48-70 h of incubation [16]
The strains were identified as Lysinibacillus sphaericus RSV1 and Stenotrophomonas maltophilia RSV-2 1 based on morphology, physiochemical properties, and the results of 16S ribosomal RNA gene sequence analysis [16]
Summary
With the increased demand for textile products, the textile industry and its wastewater have been increasing proportionally, making it one of the main sources of severe pollution problems worldwide. Two potential strains namely Lysinibacillus sphaericus RSV1 and stenotrophomonas maltophilia RSV-2 were isolated from textile dyewaste effluent capable of decolorizing four different mixed reactive dyes namely Blue RR, Black B, Red RR and Yellow RR up to 2700mgl and 2100mg-l respectively with 50-60 percent decolorization within 48-70 h of incubation [16]. A bacterial strain AAP56, isolated from a polluted soil (from Kelibia city) and identified as Stentrophomonas maltophilia, was interesting for its ability to decolorize recalcitrant dyes of an industrial effluent SITEX Black [19]. This strain can decolorize some synthetic dyes such as Methylene Blue, Toluidine Blue, Methyl Green, IndigoBlue, Neutral Red, Congo red, Methyl Orange and Reactive Pink [20]. It is essential to evolve regulations designated to improve the health and safety and the human and natural environment [27]
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