Removal of dye from textile wastewater using zero valent iron nanoparticle

Abstract

Water is a precious commodity which is indispensable and is absolutely necessary for sustenance for life. Although 71% of the earth surface is covered with water which consists of nearly 97.5% salty water and 2.5 % of the freshwater and out of which only 0,007 % is available for drinking. The industrial wastes are a major source of the water pollution which contains various kinds of dyes and other pollutants. Among industries, textile dyeing industries have a wide range of color dyes and bright hues. Over 70,000 tons of approximately 10,000 types of dyes and pigments are annually worldwide disposed of which 20 to 30% industrial effluents are those which are released during the textile curing and finishing process. Dyes have been extremely used in textile, leather tanning, cosmetics, pigments and many other industries. The presence of these dyes in the hydrosphere possesses a significant source of pollution because of their visibility at very low concentration and their nature of recalcitrance which can be lead to undesirable danger to the visibility of aquatic life such as sunlight penetration and resisting photochemical reaction. This waste water generated during the dyeing process increases chemical oxygen demand (COD), and Biology oxygen demand (BOD) levels of aquatic source. The discharge of wastewater without any treatment has an impact on the receiving water bodies crying out for an effluent treatment process. The objective of this project was to identify a nanoparticle that is capable of removing color / dye from textile wastewater.