Patent ID: 7494588
Filing Date: 2009-02-24
Classification: C02F,Y02W

Abstract:
1. A method for controlling a wastewater purification system for purifying wastewater by a batch activated sludge process, the wastewater purification system including a reaction tank containing an aeration device, a programmable sequencer for controlling said aeration device, a first sensor for detecting the dissolved oxygen concentration disposed in said reaction tank, a second sensor for detecting the oxidation-reduction potential disposed in said reaction tank, a third sensor for detecting the hydrogen ion concentration disposed in said reaction tank and a controller, the method comprising the steps of: controlling said aeration device by said programmable sequencer; acquiring, in said controller, respective data waveforms from said first sensor, said second sensor and said third sensor, and control status data of said programmable sequencer; analyzing, in said controller, said data waveform of dissolved oxygen concentration from said first sensor, said data waveform of oxidation-reduction potential from said second sensor, and said data waveform of hydrogen ion concentration from said third sensor, and performing in said controller, an alarm process when a deviation from a previously fixed normal state is discovered as a result of said analysis.