Abstract
The aim of presented research was to optimize the treatment process of the Prut River water. In order to realize the proposed goal, there were studied the following factors which can improve the process of coagulation: (i) the infl uence of stirring speed during coagulation and (ii) the infl uence of the concentration of the coagulant solution added in the process of coagulation. The optimal conditions of coagulation were established using the Jar-test method. Application of the recommended procedure contribute to the reduction of the coagulant dose, the contact time, the aluminum concentration in water and the expenses for water treatment.
Highlights
Natural water is a heterogeneous medium due to the presence of particulate materials and micro-bubbles of gas.The particulate materials of natural waters are distinguished by their size
This paper presents a study regarding the water treatment with aluminum sulphate, aiming to obtain drinking water with turbidity values lees than 5 nephelometric turbidity units (NTU), according the existing criteria
The main stages applied in the potabilization technologies of natural waters
Summary
Natural water is a heterogeneous medium due to the presence of particulate materials and micro-bubbles of gas. The particulate materials of natural waters are distinguished by their size. The particles with sizes of less than 10μ have a sedimentation velocity less than 0.01 cm/s, and are evenly distributed throughout the water horizon [1]. With decreasing of particle size, the time required for settling has increased. Due to very small dimensions, the only way to separate the particles is their agglomeration into bigger ones that settles easier. Rejecting electrostatic forces prevent the particles to reach each other, and the suspension is stable [2]
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