Abstract: A method and apparatus for regulating the temperature of the cavitation medium for a cavitation chamber is provided. A heat exchange fluid is pumped through a heat exchange conduit that passes through a portion of the cavitation chamber. An external heat exchanger, couples either directly or indirectly to the heat exchange conduit, regulates the temperature of the heat exchanger fluid which, in turn, regulates the temperature of cavitation medium within the cavitation chamber. The heat exchanger can be used to lower the temperature of the cavitation medium to a temperature less than the ambient temperature; to withdraw excess heat from the cavitation medium; or to heat the cavitation medium to the desired operating temperature. The heat exchanger can utilize heated heat exchange fluid, cooled heat exchange fluid, thermoelectric coolers, heat sinks, refrigeration systems or heaters.

Abstract: An apparatus and method for treating a liquid by acoustic cavitation. In a first stage, in a cavitation chamber under positive static pressure. In a second stage by hydrodynamic cavitation. The energy and pressure expended in the first stage is recovered in the second stage to make an efficient processing system for cavitating liquids. The process and system may be used for disinfecting water.