Cavitation is a physical phenomenon associated with three aspects: formation, growth, and collapse of vapor or gas-vapor bubbles within the body of a liquid due to variations of local static pressure.
Decreasing the pressure over a liquid and bringing it to its vapor pressure at the operating temperature generates vapor bubbles in the liquid. When the pressure is brought back to normal pressure, these vaporous bubbles collapse with a bang to generate intense pressure and temperature at the point of collapse (Fig. 1). Such intense conditions (5,000 atm and 12,000°K, intense turbulence) and resulting shock wave can bring about several physical, chemical & biological transformations, even when the bulk conditions are ambient.
EnviroTech Technology uses this technology to create and collapse precisely tailored cavitation bubbles to modulate the pressure, temperature, and turbulence conditions by means of controlled variations in the pressure of fluid.
Cavitation technology compares favourably with similar Advanced Oxidation Processes (AOP) like Fenton’s process, wet air oxidation, ozonation and hydrogen peroxide treatment and ultrasonic/ acoustic cavitation. These technologies require addition of more chemicals, which in turn add to the effluent load that need to be mineralized. Moreover, there is a requirement for higher bulk pressure and temperature as longer processing times are needed on many occasions. Advantages of cavitation technology include:
Cavitating reactors have been proven to intensify physical, chemical as well as biological processes in effluent treatment plants in energy and cost-effective manner. Cavitation delivers high amount of energy at a specific location, which increases the efficiency of the system.