Abstract
Discharge of textile wastewater containing toxic dyes can adversely affect aquatic organisms and human health. The objective of the study was to investigate the potential of immobilized marine microalgae (Chlorella marina, Isochrysis galbana, Tetraselmis sp. Dunaliella salina and Nannochloropsis sp.) and freshwater microalga (Chlorella sp.) in removing dye from textile wastewater (TW). The present study incorporated the use of 2% sodium alginate matrixes for decoloration. Among the algal species tested, the highest colour removal was noticed in Isochrysis galbana (55%) followed by freshwater Chlorella sp. (43%). The present method is easy to use, cost effective and devoid of technical problems. Key words: Marine microalga, immobilization, textile wastewater, Chlorella marina, Isochrysis galbana, Dunaliella salina, biosorption, bioremediation.
Highlights
Biosorption is one of the most innovative technologies to remove contaminants from the aqueous solution and wastewaters
The results show that the decolorization of dyes was increased with time up to 120 min
The rate of dye decolorization was quite slow after 120 min which may be probably due to products inhibition
Summary
Biosorption is one of the most innovative technologies to remove contaminants from the aqueous solution and wastewaters. Textile industrial wastewaters are characterized with high amount of biochemical oxygen demand (BOD), total suspended solid (TSS), chemical oxygen demand (COD), alkalinity and total dissolved solids (Kaushik and Malik, 2009). Degradation of wastes from these industrial discharges becomes difficult (Fewson, 1998). These dyes cause problems to human health, because they have toxic, carcinogenic and even mutagenic compounds that pose a serious hazard to aquatic organisms (Ozer et al, 2005). The chromophores in anionic and nonionic dyes mostly consist of azo groups or anthraquinone types
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