Comparative Analysis of Persistent Organics Removal Based On the Aeration Source Supplied To Biological Treatment of Textile Industry Wastewater

摘要

This paper presents a study on the removal of persistent organics from the textile industry effluents. The higher quantities of water and wider spectrum of dyes and auxiliary chemicals used impart a complex nature to combined effluent from textile manufacturing units. Standards for color, organics and dissolved solids are becoming stringent with time and regulators are in demand of zero liquid discharge units. The study suggests innovative solution to said issues by upgradation of the existing secondary treatment systems without need of additional area footprint. Present study investigates the use of pure oxygen to supply aeration instead of convention air diffusion system. The proposed aeration system is aimed at reducing required operation time to achieve the target organic removal percentage. A COD removal of 68 % and 73 % was observed for the treatment units supplied by conventional air and pure oxygen respectively. The present focus of the study on secondary treatment improvement can also contribute to reduced chemical use in primary treatment and reduced energy use in following tertiary treatment operations. The study attempts at reducing cost of recycled water for textile industry units and provide economically viable treatment options for these major polluting industry units.