Comparison Between Different Types of Organic And Inorganic Coagulants Used in Water Purification

An experimental study was conducted with the aim of comparing different types of coagulants and choosing the most suitable type in (Geziret Al-Dahab) water treat-ment plant. Seven types of coagulants were applied, the first one was ferrous sulfate FeSO4 the second was ferric sulfate Fe2 (SO4)3, the third was ammonium chloride, the fourth one was ferrous chloride Fe Cl2 the five was aluminium sulfate (alum) Al2 (SO4)3, the sixth one was chitosan and the last one was alum with chitosan. the maximum removal efficiency of turbidity was realized by using alum with chitosan. The maximum removal efficiency was 82% at dose = 5 / 15 mg/l of initial concentration 1%. Furthermore, the minimum removal efficiency of turbidity was obtained when using chitosan as a coagulant. was 56% at dose = 8 mg/l. There was no important effect on the values of entire dissolved salts when using the above coagu-lants . There was an important effect on the conductivity of raw water when using chitosan.