Purification of putrescible unstable wastes

Claim 1

IN A METHOD OF PURIFYING WASTE MATERIAL CONTAINING PUTRESCIBLE MATTER WHICH COMPRISES SUBJECTING SAID MATERIAL IN A CLARIFYING ZONE TO CONDITIONS TO CAUSE FLOCCULATION, SEPARTING THE FLUOCCULATED COMPONENTS FROM THE SUSPENDING LIQUID, TREATING THE EFFLUENT THEREFROM IN AN AEROBIC TREATING ZONE WHEREIN A SLUDGE COMPONENT IS SEPARATED OUT FROM AN EFFUENT, REMOVING THE LAST EFUENT TO WASTE, THE IMPROVEMENT WHICH COMPRISES TREATING THE SEPARATED SLUDGE WITH A CHEMICAL OXIDANT WHEREBY OXIDIZATION OF THE PUTRESCIBLE MATTER THEREIN IS EFFECTED AS A RESULT OF UNIMPEDED AND RAPID CIRCULATION OF THE SLUDGE WHILE MAINTAINING ALL OF THE PARTICLES OF SAID SLUDGE IN SUSPENSION AND FURTHER MAINTAINING SAID CHEMICAL OXIDANT IN INTIMATE CONTACT WITH THE SAID SLUDGE BEING PROCESSED FOR A TIME SUFFICIENT TO COMPLETE THE CHEMICAL OXIDATION REACTION, THEREAFTER FORMING AN EFFLUENT, SAID EFFLUENT HAVING A PH VALUE OF FROM 2.5 TO 6.5, AND INTRODUCING SAID LAST EFFLUENT INTO THE INITIAL WASTE MATERIAL IN ADVANCE OF SAID CLARIFYING ZONE FOR EXPECTING THE FLOCCULATION THEREIN.