公开(公告)号：US3846301A

公开(公告)日：1974-11-05

申请号：US27825172

申请日：1972-08-07

Applicant: SANITAS CO LTD

Inventor： STOKES J ,  COUSINS A

IPC: C02F1/50 ,  B03B9/06 ,  C02F1/467 ,  C02F1/66 ,  C02F1/72 ,  C02F9/00 ,  C02B1/36

CPC classification number: B03B9/06 ,  C02F1/4674 ,  C02F1/66 ,  C02F2103/005 ,  C02F2201/001 ,  Y10S210/916

Abstract: 1. A METHOD OF TREATING SEWAGE COMPRISING THE STEPS OF: (A) FLUSHING SEWAGE FROM A PLURALITY OF RECEIVERS BY MEANS OF FLUSHING LIQUID, THUS FORMING A MIXTURE OF (B) SEPARATING THE MIXTURE INTO A FIRST PART WHICH HAS (B) SEPARATING THE MIXTURE INTO A FIRST PART WHICH HAS A HIGH CONTENT OF SOLID MATTER AND A LOW CONTENT OF LIQUID AND INTO A SECOND PART WHICH HAS A HIGH CONTENT OF LIQUID, (C) AFTER STEP (B) SEPARATING, AT A SUPERATION ZONE, SAID SECOND PART INTO A SOLID MATTER PORTION AND A LIQUID PORTION, (D) MAINTAINING A CAUSTIC ALKALI CHEMICAL COMPOSITION IN SAID LIQUID PORTION AT A CONCENTRATION NOT EXCEEDING ONE PERCENT SUCH THAT SAID LIQUID PORTION IS DISINFECTANT AND DEODORANT, (E) MAINTAINING A BLEACHING ACTION IN SAID LIQUID PORTION SO AS TO HAVE A DECOLORISING EFFECT, (F) USING SAID LIQUID PORTION AS SAID FLUSHING LIQUID FOR REPETITION OF STEP (A), (G) AFTER STEP (B) CONVEYING THE FIRST PART AWAY FROM SAID SEPARATION ZONE TO A COMMINUTION ZONE REMOTE FROM SAID SEPARATION ZONE AND SUBJECTING SAID FIRST PART TO MECHANICAL REDUCTION OF THE SIZE OF THE PIECES OF THE SOLID MATTER THEREOF, (H) PROVIDING A STORAGE ZONE REMOTE FROM SAID SEPARATION ZONE FOR STORAGE OF THE SOLID MATTER; (I) AFTER STEP (G), CONVEYING THE FIRST PART HIGH IN SOLID CONTENT FROM SAID COMMINUTING ZONE TO SAID STORAGE ZONE WHEREBY SUBSTANTIALLY ALL OF THE SOLID MATTER OF SAID FIRST PART IS SUBJECTED TO THE CHEMICAL CONTENT OF THE LIQUID CONTENT THEREOF AND IS THEREBY BROKEN DOWN, DISPERSED, STERILISED AND DEODORISED; AND (J) TRANSFERRING SAID SOLID MATTER PORTION SEPARATED FROM SAID SECOND PART TO SAID STORAGE ZONE.