الفهرس 
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Abstract
The present work is undertaken with the view of evaluating the impacts
of selective effluent-treatment methods on the extent of minimizing and controlling the pollution created by the effluents from Dakahlia Spinning and Weaving (DETEX) Company in Dakahlia Governorate. Thus, it was necessarily to treat textile wastewater effluents before their discharg into the drainage canals to prevent and I or minimize the environmental hazardous impacts of these effluents as well as to meet the local environmental legislation requirements. Textile industry consumes a huge cubic meters of municipal and ground water. It also produces many cubic meters of wastewater that negatively impact on the environment causing many environmental problems. Therefore it was necessary to treat these effluents before their discharg into {he drainage or canals. The concept of pollution prevention was carried out through the chemical substitution of sodium thiosulfate used in the bleach clean-up using Terminox Ultra 50 L as a hydrogen peroxide killer and Bioprep3000 L enzyme instead of sodium hydroxide. Terminox Ultra 50 L is a stabilized liquid catalase that breaks down hydrogen peroxide into nonactive oxygen molecule and two water molecules. The Terminox Ultra SOL bleach clean up process offers several advantages such as low water consumption, short process time about 10 - 20 minutes and no negative effects on the reactive dyestuffs or textile materials compared to the conventional methods. Moreover, the turbidity and the total dissolved salts were minimized with Tenninox Ultra 50 L compared to the traditional bleaching cleanup process with sodium thiosulfate . The main disadvantages of biobleaching clean up with Tenninox Ultra SO L was the increase of the values of both BOD and COD and this was may be due to the high protein content of the Tenninox Ultra 50 L. Bioprep 3000 L enzyme is an alkaline pectinase enzyme that able to scour the cellulosic fibers instead of sodium hydroxide. The optimum pH value for Bioprep 3000 L enzyme was 8. The pH value of textile effluents produced from the scouring I bleaching process was reduced from 10 to 8. The turbidity and the total dissolved salts were also minimized with Bioprep 3000 L enzyme.