NOVELTY - A system (204) for removing redox active contaminant from waste stream (202) including water component, comprises: two closely spaced coated electrodes to be submersed in the waste stream, and defining an interaction zone; power supply for applying a pulsed electrical signal to the electrodes to generate oxyhydrogen-rich gas (214) from the water component which will form bubbles in interaction zone that rise to a surface of the stream; reaction vessel to contain bubbles as they rise; gas containment lid to trap mixture of gas and contaminant; and device for transporting the mixture.    USE - As a system for removing a redox active contaminant from a waste stream including a water component, such as an unclarified waste stream (Claimed), particularly industrial waste water, and municipal waste water. Also for removing pharmaceuticals, personal care products and petrochemical products from the waste water.    ADVANTAGE - The present system is an improved system for flocculation, incineration, dewatering, energy efficiency, stabilization, effluent disinfection, chemical removal and production of high quality process water in a wastewater treatment plant and for treating other kinds of waste streams, particularly by using treatment with oxyhydrogen-rich gas. The gas produced in the present system is an oxyhydrogen-rich gas that can be combusted with minimal greenhouse gases as by-products. The gas does not require extensive cleaning and the quantity of gas produced can be adjusted to match the demand for power. The production of power within the treatment plant utilizing the produced gas will result in long-term lower electrical costs and provide a secure supply of electricity that is independent of external market conditions.    DETAILED DESCRIPTION - A system (204) for removing a redox active contaminant from a waste stream (202) including a water component, comprises: two closely spaced coated electrodes to be submersed in the waste stream, and defining an interaction zone extending between them; a power supply for applying a pulsed electrical signal to the coated electrodes to generate from the water component oxyhydrogen-rich gas (214) which will form bubbles in the interaction zone that rise to a surface of the waste stream; a reaction vessel to contain the bubbles as they rise; a gas containment lid to trap above the waste stream a mixture of the oxyhydrogen-rich gas and the redox active contaminant of the waste stream, where the mixture formed by those of the bubbles that contact a portion of the redox active contaminant that transport the portion to the surface of the waste stream; and device for transporting the mixture to device for further treatment. The coated electrodes comprise a coating; and a metal doped mixed metal oxide. The two closely spaced coated electrodes comprise coated titanium electrodes and the system further comprises: two closely spaced aluminum electrodes to be submersed in the waste stream downstream of the coated titanium electrodes, the electrodes defining a second interaction zone, where the power supply applies a pulsed electrical signal to the aluminum electrodes to generate from the water component oxyhydrogen-rich gas which will form bubbles in the second interaction zone that rise to a surface of the waste stream.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of treatment of a waste stream via a waste treatment system.    Waste stream (202)    Simplified waste treatment system (204)    Oxyhydrogen gas generator (207)    Inlet (210)    Outlet (212)    Oxyhydrogen-rich gas (214)