Ultrasonic anti algae

1   Theory principle

When high frequency vibration of power ultrasonic isapplied to water, it will produce the following effects:

Mechanicaleffect: Propagation process causes alternate expansion and contraction of themedium point, resulting in positive and negative                    pressure changes, resultingin mechanical effect.

      Thermal effect: High frequency vibration willcause the water temperature of the propagation wave to rise, resulting in thethermal effect of sound energy absorption characteristics.

         Cavitationeffect: When the negative pressure of the wave in water reaches and exceeds thehydrogen bonding force between the water molecules, it will tear the watermolecules to produce vacuum micronucleus bubbles and subsequent water vapormicronucleus bubbles. When the subsequent sound wave expands, closes andoscillates to a certain energy value, the bubble collapses rapidly andcontinuously produces up to 1000. An atmospheric pressure shock wave and amicrofluidic jet.

        Pyrolysis and free radical effect: vapor producedby vacuum micronucleus bubbles splits and reacts in chains at high temperaturesand pressures to produce OH, which, when the bubble collapses, causes OH toenter the whole water. OH is a super oxidant for organic compounds in theultrasonic field, including vital macromolecules such as proteins andmolecules. Nucleic acids, etc., can react rapidly with cavitation, and theirmechanisms include pyrolysis and oxidation of free radicals. Generallyspeaking, hydrophobic and volatile organic compounds can be pyrolyzed incavitating bubbles; hydrophilic and non-volatile organic compounds can oxidizewith ~ OH at the gas-liquid interface of cavitating bubbles or in aqueoussolution.

Studies have shown that ultrasonic can clear away soundfield area of aquatic organisms, destroy aquatic organisms eggs andlarvae.under certain conditions,

    Frequency range:  20-30 kHz and 0.3 0.5 W/cm2 to aquaticorganisms, especially for sea creatures chasing and killing effect is obvious.

Workingtime:    as long as 10 seconds to 30 seconds or so

Temperature:   specific water temperature (30 ℃ - 45 ℃) effect is best.

Studies have shown that ultrasonic can obviously resist the growth ofalgae these effects under certain conditions

   Frequency range: When theultrasonic frequency is 580 kHz, the free radical concentration peak, theremoval rate of Microcystis is the highest, indicating that oxidation removalof Microcystis may be more effective.

The cyanobacteria which are mostharmful to water body by low-frequency and low-energy ultrasonic wave havestronger control ability, and have better inhibition to green algae and diatom.Ultrasound parameters of 20-40 kHz and 0.2-0.5 W/cm 2 were better than greenalgae and diatom in the removal of cyanobacteria, and better than Microcystisin the removal of Anabaena.