مجلة الدراسات العليا
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Item Evaluation of Treatment and Recycling of Afrotan Tannery General Waste Water:(مجلة الدرسات العليا, 2016) ALfatih A.Yassen1; A.Alsalam A.Almaged2; Gurashi A.Allah Gasmelseed3Afrotan tannery was established in 1983, in Albageer Area- Algazeera State - Sudan. It generates high amount of waste water from soaking, deliming, bating, fleshing and cleaning processes. The tannery collects, mixes and treats this waste water in unit called general waste water treatment unit. The aim of this study is to evaluate the efficiency of the method of treatment applied in general waste water treatment unit. The results showed that, the treatment unit receives 1000 m3/day of general waste water. 300 m3/day of this quantity is precipitated as sludge in sedimentation tanks. 700 m3/day of quantity is the amount of treated and clear water. 280 m3/day of this clear water is reused in production line and the remained (420 m3/day) of it is evaporated in land. Also the results showed the removal rates of ammonia, nitrates, sulphates and chlorides are very low and the concentrations of these effluents before and after treatment were (from 704 to 501, from 911 to 850, from 4203 to 3995, and from 10205 to 9601 mg/l) respectively. High concentration of chlorides are very good for reusing this treated water in soaking process but ammonia, nitrates and sulphates (delimng process effluents) are not required when reusing this treated water in soaking process. The removal of ammonia, nitrates and sulphates acts in biological oxidation tank by bacteria and this process increases the treatment cost. The study recommended that it is important to separate waste water of deliming and bating processes from general waste water and recycle it directly.