Method and apparatus for treatment of organic matter-containing wastewater

A method for treatment of wastewater containing organic contaminant materials which comprises the steps of:

• (A) passing the wastewater through the wastewater treatment conduit which conduit comprises:
• (a) a straightly tubular part having a rectangular or circular cross section and
• (b) a radical generating part consisting of
• (b1) a first truncated pyramidal or conical tubular member having a coating layer of a water-insoluble metal oxide coming into contact with the wastewater to serve as a positive electrode and connected at the broader end to the upstream end of the straightly tubular part, the narrower end being open, and
• (b2) a rod member having a surface of a corrosion-resistant metal to serve as a negative electrode and inserted into the truncated pyramidal or conical tubular member along the axial line thereof from the upstream end toward the downstream end thereof, and
• (B) applying a direct current voltage between the positive and negative electrodes to give a voltage gradient in the range from 0.2 to 6 kilovolts/cm producing a pulsed electric current density of 5 μÅ/cm2 to 50 mÅ/cm2 having a rectangular wave form at a frequency in the range from 10 kHz to 150 kHz.

A method for treatment of wastewater containing organic contaminant materials which comprises the steps of:

• (A) passing the wastewater through the wastewater treatment conduit which conduit comprises:
• (a) a straightly tubular part having a rectangular or circular cross section;
• (b) a radical generating part consisting of
• (b1) a first truncated pyramidal or conical tubular member having a coating layer of a water-insoluble metal oxide coming into contact with the wastewater to serve as a positive electrode and connected at the broader end to the upstream end of the straightly tubular part, the narrower end being open, and
• (b2) a rod member having a surface of a corrosion-resistant metal to serve as a negative electrode and inserted into the truncated pyramidal or conical tubular member along the axial line thereof, and
• (c) an ultrasonic part consisting of
• (c1) a second truncated pyramidal or conical tubular member connected at the broader end to the downstream end of straightly tubular part, the narrower end being open, and
• (c2) an ultrasonic vibrator mounted on the second truncated pyramidal or conical tubular member (c1), from the upstream end toward the downstream end thereof;
• (B) applying a direct current voltage between the positive and negative electrodes to give a voltage gradient in the range from 0.2 to 6 kilovolts/cm producing a pulsed electric current density of 5 μÅ/cm2 to 50 mÅ/cm2 having a rectangular wave form at a frequency in the range from 10 kHz to 150 kHz;
• and
• (C) driving the ultrasonic vibrator to emit pulsed ultrasonic waves, the emission periods of the ultrasonic waves being limited to coincide with the intermission periods of the pulsed electric current.