Abstract: Provides a self-cleaning conic reaction chamber having specific multiple conduit connections, sealable closure, internal mixer, external vibrators and dependent sludge accumulator which chamber can be flow connected to readily available handling units to form a stepwise acid/iron/alkali assembly for treating contaminated liquid such as sewage or other waste water so as to obtain uncontaminated liquid and sterile sludge. Stepwise flow can be automated by adding stepping timer and electronic controller responsive to pH probes and pressure-, liquid level- and turbidity-sensors plus remote controlled valves, pumps, blowers and metering devices.

Abstract: Apparatus for step-wise purification treatment of contaminated polar liquid, such as water, by the procedure of U.S. Pat. No. 4,224,148, comprising successive flow-connected container units, electrically insulated from the ground, the sequential units providing: (a) macerating/distributing means for producing suspension of selected small-particle-size contaminant which will accept a galvanic charge, (b) means for maintaining acidic pH of 2 to 2.5 in presence of gaseous oxidizing agent, (c) source of soluble metal ions adapted to impart a galvanic charge on the small particles, plus subsequent aeration means, (d) means for introducing alkaline reagent while air blowing to restrain precipitation, (e) means for alkaline flocculation of separable particles, including pH control means and switch means for electrically grounding the liquid medium.