Sewage treatment process and apparatus

Claim 1

THE METHOD OF TREATING SEWAGE WHICH COMPRISES ESTABLISHING AERATION, SETTLING, SLUDGE RE-AERATION AND EFFLUENT STORAGE ZONES, SAID AERATION AND SETTLING ZONES BEING CONTIGUOUS AND COMMUNICATING AT A POINT BELOW THE NORMAL LIQUID LEVEL OF SAID ZONES, SAID SETTLING AND SLUDGE RE-AERATION ZONES BEING CONTIGUOUS AND COMMUNICATING IN THE LOWER PORTIONS OF SAID ZONES, ESTABLISHING A MIXTURE OF SEWAGE AND SLUDGE IN SAID AERATION ZONE, PASSING AIR INTO SAID MIXTURE IN SAID AERATION ZONE IN QUANTITIES TO SATISFY A MAJOR PROPORTION OF THE BOD, FLOWING AERATED MIXTURE FROM SAID AERATION ZONE TO SAID SETTLING ZONE IN LIQUID LEVEL MAINTAINING RESPONSE TO LIQUID LEVEL DIFFERENTIAL BETWEEN SAID ZONES, FLOWING SETTLED SLUDGE FROM SAID SETTLING ZONE TO SAID RE-AERATION ZONE AS A CONSEQUENCE OF LIQUID LEVEL MAINTAINING RESPONSE TO DISCHARGE OF SLUDGE FROM SAID RE-AERATION ZONE, PASSING AIR INTO SAID SLUDGE IN SAID RE-AERATION ZONE, DISCHARGING AERATED SLUDGE FROM SAID RE-AERATION ZONE TO SAID AERATON ZONE FOR INTRODUCTION OF SLUDGE IN THE ESTABLISHING OF SAID MIXTURE IN SAID AERATION ZONE, DISCHARGING CLARIFIED LIQUOR FROM SAID SETTLING ZONE TO SAID EFFLUENT STORAGE ZONE AND THEREAFTER DISCHARGING STORED LIQUOR TO A RECEIVING BODY.