الفهرس 
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Abstract
Leathering tanning wastewater contains high levels of organics and other pollutants. the current study was dole out to analyze the biodegradation process of Leathering tanning process effluents using biological treatment such as activated sludge. A different aeration cycles were applied such as 6, 8 and 12 hours. In addition, some locally isolated bacteria from the collected wastewater samples.
Five different Leathering tanning effluent samples were collected from Leathering tanning factory at Elfostat city, Egypt. Two bacterial species (Bacillus and Staphylococcus) were separated from the raw industrial wastewater samples, identified and used for biodegradation process. Bacterial isolation process was
prepared in the laboratory of national research center. Two-stage (aeration and sedimentation) laboratory scale model were designed. Results indicated the great ability of Bacillus bacteria for improving of the physicochemical parameters. The removal percentage of COD, BOD, TSS, NH3-N, TN and TP are 97.57, 96, 91.35, 96.15, 98.59 and 62.79 respectively. Biodegradation of leather tanning wastewater counting on local microorganisms is an efficient, cheap and eco-friendly technology. Key words | bacteria, biodegradation, leather tanning effluent, tanning process.