Patent ID: 6866757

Claim:
In an electrocoagulation reaction chamber for the electrolytic treatment of a stream of process liquid, having a supporting frame providing a pair of laterally spaced, longitudinally extending, dielectric rails for supporting an electrode stack; first and second spaced apart end plates that are carried by said supporting frame; an electrode stack that is located between said end plates and that defines a flow path therethrough for process liquid, formed of at least: a dielectric spacer that is supported on said rails and which defines a central spacer opening that forms a portion of the flow path; first and second electrode plates that are supported on the rails, wherein said first electrode plate is positioned between the first end plate and said spacer, and said second electrode plate is positioned between the second end plate and the spacer; and wherein one of said electrode plates defines a central electrode aperture that is positioned centrally relative to the central spacer opening and forms a portion of the flow path; and the other of the electrode plates defines a plurality of spaced apart peripheral electrode apertures that are positioned peripherally relative to the central spacer opening and form a portion of a flow path; a compression means for selectively applying or releasing a compressive force on the end plates for selectively applying compression to said electrode stack or releasing compression from the electrode stack; an inlet means for supplying process liquid into a first end of the flow path; and an outlet means for discharging process liquid from a second end of the flow path, the improvement comprising: said central spacer opening of said dielectric spacer is formed of a plurality of trough portions and crest portions, wherein a trough portion is juxtaposed to each of a plurality of said peripheral electrode apertures, and trough portions at neighboring peripheral electrode apertures are separated by a crest portion.