Abstract: An apparatus and method for treating wastewater is described. The apparatus includes an entry mixing chamber equipped with a wastewater inlet port and a gas inlet port configured for receiving the wastewater and pressurized gas, respectively. The apparatus further includes a housing attached to an open top of the entry mixing chamber, a first electrode and a second electrode arranged within the housing, and a collecting chamber mounted on an open housing top. The collecting chamber has a wastewater outlet port for discharge of the treated wastewater. A conductive particulate material is placed between the first and second electrodes to fill a space between the electrodes. The apparatus also includes an electrically powered mixer comprising an axle equipped with one or more whirling blades. The axle passes through the housing such that the whirling blades are located within the conductive particulate material.