Process for improving the combined mechanical and biological clarification of town sewage

Claim 1

PROCESS FOR THE CONTINUOUS COMBINED MECHANICAL AND BIOLOGICAL PURIFICATION OF SEWAGE CONTAINING COARSE AND FINE SOLID IMPURITIES AND SUPPLIED AT A NON-UNIFORM RATE, COMPRISING THE FOLLOWING STEPS: MECHANICALLY SEPARATING THE SEWAGE IN A FIRST STAGE INTO WASTER WATER, FREE OF COARSE SOLID IMPURITIES, AND COARSE SLUDGE COMPRISING COARSE SOLID IMPURITIES, PASSING THE COARSE SLUDGE INTO A DIGESTION STAGE, TREATING SAID WASTE WATER FREE OF COARSE SOLID IMPURITIES IN AN ADDITIONAL MECHANICAL SEPARATION STAGE WHEREBY CONTAINED FINE IMPURITIES ARE SEPARATED OUT AS FINE SLUDGE, PASSING THE FINE SLUDGE INTO THE AFOREMENTIONED DIGESTION STAGE AND PASSING THE WASTE WATER FREE OF FINE IMPURITIES INTO A STORAGE ZONE, REMOVING WASTE WATER FREE OF FINE IMPURITIES FROM SAID STORAGE ZONE AT A UNIFORM HOURLY RATE DURING THE ENTIRE TWENTYFOUR HOURS OF EACH DAY, INTRODUCING A PORTION OF THE WASTE WATER SO REMOVED INTO A BIOLOGICAL PURIFICATION ZONE HAVING A SHORT DETENTION PERIOD, AND MTHE REMAINING PORTION INTO A SEPARATE BIOLOGICAL PURIFICATION ZONE HAVING A LONG DETENTION PERIOD, AND THEREBY FORMING ACTIVATED SLUDGE IN SAID LAST MENTIONED ZONE, REMOVING WASTE WATER FROM SAID SHORT DETENTION ZONE AND USING THE SAME TO DILUTE THE ABOVE MENTIONED WASTE WATER FREE OF COARSE SOLID IMPURITIES, PASSING FROM SAID LONG DETENTION ZONE WASTE WATER CONTAINING ACTIVATED SLUDGE INTO A CLARIFYING STAGE WHEREIN THE ACTIVATED SLUDGE IS SEGREGATED FROM THE CLARIFIED WASTE WATER, AND RECYCLING ACTIVATED SLUDGE SO SEGREGATED AND CLARIFIED WASTE WATER INTO THE AFOREMENTIONED WASTE WATER FREE OF COARSE SOLID IMPURITIES TO FURTHER DILUTE THE SAME, AND THEREBY CONTROL THE CONDITIONS IN THE BIOLOGICAL PURIFICATION ZONE TO FORM A SLUDGE THAT CAN BE EASILY FLUSHED OFF.