Patent ID: 6706168
Filing Date: 2004-03-16
Classification: C02F

Abstract:
A wastewater treatment method adapted to subject a liquid to be treated to the coagulation, decomposition, sterilization and separation of impurities by utilizing an AC power source to apply an AC voltage of a predetermined frequency between a first electrode and a second electrode provided in the liquid, comprising the step of:using a high frequency suited to the quality of the water and in a frequency band in which metal ions, hydrogen, and oxygen are dissolved into and taken out in large quantities, occurring in the AC electrolysis of the object liquid at the frequency of the AC voltage, resulting in an electrochemical reaction, the generation of fine bubbles, and the fractionation of minute solid particles, crystals, bubbles, sludge and organisms caused by a variation in the oxidation-reduction potential and the oxidation potential, and an increase in the electric field effect (vibration effect) of the system: all promoting the removal of impurities from and sterilization of the liquid; self-cleaning the first electrode and second electrode by using a low frequency in a frequency band in which metal ions, hydrogen and oxygen are dissolved into and taken out in large quantities, occurring in the AC electrolysis of the liquid being treated, with the effect of a large variation in the oxidation-reduction potential and oxidation potential while self-cleaning the electrodes, said AC voltage of high frequency for treating the liquid and said AC voltage of low frequency for self-cleaning the electrodes being switched from one to the other in a predetermined cycle, the resultant AC voltage being applied between the first and second electrodes.