Optimization of process conditions in water treatment through coagulation diagrams, using Moringa oleifera Lam and aluminium sulphate

The construction of coagulation diagrams is provided to obtain colour, turbidity and compounds with absorption at UV254nm removal by associating the coagulants Moringa oleifera Lam and aluminium sulphate to define the optimal conditions of the process in water treatment. Experiments were performed in jar test with several coagulant dosages and coagulation pH. Optimal conditions for raw water with high colour/turbidity were obtained at pH values ranging from 7.5 to 8. After filtration, three dosages of association aluminium sulphateM. oleifera, 25ppm/300ppm; 20ppm/350ppm and 15ppm/400ppm, performed efficient removal of evaluated parameters, namely 97.7% plus for colour and turbidity and 68.2% for compounds with absorption at UV254nm. Results showed that the use of coagulation diagram is useful since it provides development of tests in optimal conditions, depending on water initial characteristics. The association of coagulants aluminium sulphateM. oleifera may be considered an alternative technique for conventional water treatment.