COMBINATION COAGULATION AND ADSORPTION PROCESSES FOR TREATING TEXTILE WASTEWATER IN HOUSEHOLD INDUSTRY

Abstract

Textile wastewater is a considerable source of environmental contamination due to its strong color, high pH and chemical oxygen demand (COD), and low biodegradability. The discharge of textile wastewater not only has diverse aesthetic effects, but such discharge can be carcinogenic, mutagenic and generally detrimental to our environment. Thus, textile wastewater should be removed completely before they are discharged into received water. Many methods have been reported for treating textile wastewater, among which coagulation and adsorption are widely used processes due to their relatively simple operation and low costand suitable for household industry. The aim of this study was using the combination coagulation and adsorption processes to treat textile wastewater in household-scale industry. Coagulation performance and removal efficiencies in COD and color from four varies sources of textile wastewaters were investigated. The effluent from coagulation was treated with adsorption. The adsorption isotherm and removal efficiencies were investigated. The results showed the combination processes had the overall COD were in the range of 72.9-93.8% and color removal efficiencies were in the range of 70.6-98.5%. The results of coagulation study were found that in some cases of wastewater were effective in color removal but failed in COD removal, in another case, had failed in color but were effective in COD removal efficiencies. The results showed varies of pH had much affected on color removal efficiencies more than COD removal efficiencies. The further experiments should be carried out to improve the combination removal efficiencies for application as suitable for textile household industry.