الفهرس 
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Abstract
Natural surface waters contain particulates of organic and inorganic origin. Inorganic particulate constituents, including clay, silt, and mineral oxides. Organic particulates include algae, bacteria, and fine colloidal and dissolved organic constituents such as humic acids, and fulvic acids. This study focuses on the coagulation, flocculation, and sedimentation processes ability to remove or reduce these particulates. The efficiency of these processes could be discussed through the removal of turbidity and natural organic matter (NOM) characteristics. Enhanced coagulation could achieve better removal efficiency of NOM because it depends on higher coagulant dose and adjusted pH. A spiral hydraulic flocculation system has been studied, and it gives a very smooth tapered flocculation with decreasing rate of velocity gradient. The efficiency of this system was discussed with varying parameters such as retention time of different processes. Enhanced coagulation was applied in order to achieve the best removal efficiency of NOM after several trials of jar tests using alum as a coagulant and with adjusted pH of synthetic raw water. The final results show that the system performance is compatible with some examples of water treatment plants, and moderately in accordance with the mathematical model developed by Edwards (1997) which determine the theoretical amount of dissolved organic carbon after coagulation, flocculation and sedimentation processes.