USING OF DRINKING AND INDUSTRIAL WATER SLUDGE IN THE TREATMENT OF INDUSTRIAL LIQUID WASTES PRODUCED FROM POWER PLANTS"

Abstract

The aim of this thesis is to study the probability of using drinking and industrial water sludge in the treatment of industrial liquid wastes produced from power plants. Collection of four different types of sludge from different water treatment plants in power station. Complete analysis, TGA and X-ray investigation were performed for the different types of sludge. The method of recovery of aluminium and iron from different types of sludge was carried out by acid digestion using sulphoric , nitric and hydrochloric acids. The evaluation of the recovered aluminium and iron in the clarification of industrial waste water was carried out by Jar test method which the most way to simulate clarification and permits, the comparison of various chemical program in the clarification of water. The obtained results showed that the optimum condition for maximum recovery was (pH =1 for 2 hours at 80oC ) for aluminium and iron recovery. At these conditions, the percentage of aluminium and iron recovery reached to 99 and 98 % respectively. The experiments confirm the significant effect of coagulant dosage (recovered aluminium and iron) on coagulation process. Under optimal conditions of process parameters, a coagulant dose about 20 to 30 mg/l at pH = 8 gives acceptable results better than that when using 35 to 45 mg/l of commercial alum and ferric chloride. The specification of the produced water after treatment by recovered aluminium and iron is compatible with Egyptian standard to drain to surface water or to use as industrial water. Keywords: Industrial water, sludge, recovered aluminium and iron, TGA , X-ray analysis.