الفهرس 
AcknowledgementOnly 14 pages are availabe for public view
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Abstract
The major objectives of this study are to assess the various waste treatment alternatives applicable to leather tanning and finishing industry. Tanneries at . ~x Industrial Complex were chosen for the study. The program included characterization of different processing effluents; possible elimination or segregat:ion of pollution sources; evaluation of the different methods of treatment; and selection of optimum treatment techno logy. Untreated wastes from Mex tanneries are discharged into the West Harbor of Alexandria City causing remark able water and air pollution in Mex area. .... A preliminary sanitary survey was conducted for all tanneries in the complex. Six tanneries were se1ect ed according to the survey result s. Quantitative and qualitative study for the wastewter streams from different processes in these tanneries, as well as, the combined effluent originated from 80 of the tanneries in the complex was carried out. Experimental studies were performed from October lY80 to September 1981. - 165 The results of the survey showed that, 2.8-3.6 m3 of wastewater is produced per each 100 Kg of hide pro ceased. About 50 tons of hides are ’processed daily in the MIC tanneries. Beam-house operation generates about 77 of the total volume of wastewater. 15 for the tan-yard opera tions, and onfy 8 for the wet finishing operations. The study indicated that a large portion of the polluting material was contained in a relatively small fraction of the flow. The results of the tannery waste.analyses showed the. t : 1- Tannery waste is characterized by wide fluctuations due to intermittent discharges. The pH of the wastes varied from 3.8 to 12.0. The main pollution constit uents were putrefiable organic matter as measured by BOD and SRi Lime, tannins-, chromium and high concent ration of salts. No Do was found in most process effluent s . 2- The spent tan liquors were extremely high in co1or and COD and high in BOD. Its pH averaged about 4.5, and upon mixing with other process effluents, the pH of the total tannery wastes was increased to 9.0. - , , 3- The results of the analyses of the MIC tannery wastes display high concentrations of various pollutants. All examined effluents do not complay with the emiss ion limitations of the Egyptian Law No. 93/62. The levels of BaD, COD, SR, TKN, chromium and 0 & G were extremely high. 4- The mean BaD values were 5072 mg/l for the beam-house waste, 11228 mg/l for the tan-yard waste and 2109 for the wet finishing waste. 5- The mean organic loads were, 18.3 KgBOD/KKg hides for the beam-house wastes, 31.5 for the tan-yard wastes, and 11.2 for the wet finishing wastes. The overall mean load was 61 Kg/KKg of green hides processed. In this study laboratory tests were conducted to assess the efficiency and design criteria for the follow ~ treatment processes: (11 Screening; (2) Plain sedi~ntation; (3) Sedimentation with chemical addition; (4) Activated sludge process; (5) Biofiltration system; (6) Sequencing Batch Biological Reactor system (SBRs) and (7) Multi-media filtration. Gel-chromatography was applied for the evaluation of these treatment systems. I Results of treatment of tanning wastewater obtained by various treatment methods are as follows: 1- Fine screening achieved 4 reduction in BODs and 5-15 reduction in SR. 2- Experiments carried out by this study indicated that, sedimentation for 24 brs.