Abstract
Physical and chemical effects of aquatic environment that occur in an ultrasonic field change the sedimentation rate of coagulated suspension. This might only happen in case of cavitation of ultrasonic filed that causes a change of potentials of the medium. Research of the influence of ultrasonic vibrations on coagulation of suspended solids within water purification allows expanding their scope of implementation. The objective of the research is to estimate the effect of ultrasound on the sedimentation of the suspended solids, to determine of the efficiency of the process in relation to the dose of the coagulant, and to calculate the numerical values of the constants in the theoretical equation. The experiment condition was held in the water with the clay substances before the introduction of the coagulant. The method of magnetostriction ultrasonic generator was applied to receive ultrasonic vibration. Estimate of concentration of clay particles in water was performed using photometry. As a result of the research, the obtained data allow determining the increase in efficiency of suspended particles sedimentation related to the dose of coagulant, depending on time of ultrasonic treatment. The experiments confirmed the connection between the effect of sedimentation in the coagulation process, the coagulant dose and the time of scoring. Studies have shown that the increase in the duration of ultrasonic treatment causes a decrease of administered doses of coagulant.
Highlights
Various physical and chemical effects occur in the ultrasonic field, may be associated with the transformation of energy of elastic vibrations
To verify the theoretical equation (2) the decrease in the concentration of clay particles suspended in water was determined, as the difference between initial and final concentration
1) Experimental studies have confirmed the assumptions about the changing potentials of the suspended particles in the water, because of the action of ultrasonic field
Summary
Various physical and chemical effects occur in the ultrasonic field, may be associated with the transformation of energy of elastic vibrations. Napiers and Nolting put forward the theory of high temperatures occurrence by adiabatic compression of a cavitation bubble [4] According to their calculations, within continuous increase the velocity of the motion of bubble – liquid boundary temperature in the collapsing bubble can reach 10000оК, and the pressure in the shock wave up to 104 bar. The this cavity can serve as a source of products with a high reactivity and launch physical and chemical actions in the ultrasonic field
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