فارسیAbstract
The textile industry is one of the largest water user’s in a world which has sewage with high color, high chemical and biological oxygen demand. The wastewater utilization which containing synthetic dye is done in a variety of ways. These methods include chemical oxidation, coagulation and flocculation, electrochemical methods, ion exchange, adsorption process, membrane processes, chemical reduction and biological treatment. Among the textile wastewater treatment methods, the coagulation process is widely used because of its simple and effective management also relatively low investment cost. In this research besides using the chemistry of coagulation and flocculation, the purpose is reuse of refined wastewater in textile processes by using economical and economically feasible methods in industrial scale. For this purpose, new super-cationic polymeric materials were used in comparison with common materials in the market including iron sulfate, alum and poly aluminum chloride, and the material which had the best laboratory results was tested on an industrial scale too. In order to optimize the process, the coagulant concentration, coagulation time and coagulation velocity in color removal, sludge production volume, BOD and COD were investigated. The results of the study showed that super-cationic polymer material has the highest sedimentation rate, the lowest amount of sludge production, the highest reduction in BOD (98%), and the most reduction in COD (92%) also in terms of price variables it is economical on an industrial scale
