Method and apparatus for treating sewage

Claim 1

A METHOD OF REMOVING GRIT OF A PARTICULAR PARTICLE SIZE FROM LIQUID SEWAGE IN A TANK, SAID SEWAGE CONTAINING RELATIVELY LIGHT ORGANIC MATTER, HEAVIER BUT RELATIVELY LIGHT PARTICLES OF GRIT, AND RELATIVELY HEAVY PARTICLES OF GRIT, SAID METHOD COMPRISING THE STEPS OF POSITIONING A BAFFLE IN SAID TANK PARALLEL TO ONE WALL OF SAID TANK TO DIVIDE IT INTO A FIRST SECTION HAVING AN INLET AND A SECOND SECTION HAVING AN OUTLET, WHEREBY SEWAGE ENTERING SAID FIRST SECTION MUST FLOW UNDER SAID BAFFLE AND UPWARDLY IN SAID SECOND SECTION TO REACH SAID OUTLET, FORCING AIR INTO THE SEWAGE IN SAID FIRST SECTION AT A PLURALITY OF POINTS ALONG A LINE NORMAL TO SAID BAFFLE TO MOVE SAID SEWAGE IN A CIRCULATORY PATH WITHIN SAID FIRST SECTION ABOUT A HORIZONTAL AXIS NORMAL TO SAID BAFFLE AND TO CAUSE SAID HEAVY GRIT TO SETTLE OUT OF SAID SEWAGE TO THE FLOOR OF SAID FIRST SECTION, MOVING SAID HEAVY GRIT ALONG THE FLOOR OF SAID FIRST SECTION TO A DISPOSAL TROUGH, FLOWING SEWAGE, FROM WHICH SAID HEAVY GRIT HAS SETTLED, FROM SAID FIRST SECTION UNDER SAID BAFFLE AND THEN UPWARDLY IN SAID SECOND SECTION AND CONTROLLING THE UPFLOW VELOCITY OF SAID SEWAGE IN SAID SECOND SECTION BY REGULATING THE SPACING OF SAID BAFFLE FROM THE PARALLEL WALL OF SAID TANK TO KEEP THE UPFLOW VELOCITY OF SEWAGE IN SAID SECOND SECTION FROM EXCEEDING THE SUBSIDENCE VELOCITY IN SAID SECOND SECTION OF GRIT OF THE PARTICULAR PARTICLE SIZE.

Claim 2

A METHOD OF REMOVING GRIT OF A PARTICULAR PARTICLE SIZE FROM LIQUID SEWAGE IN A TANK, SAID SEWAGE CONTAINING RELATIVELY LIGHT ORGANIC MATTER, HEAVIER BUT RELATIVELY LIGHT PARTICLES OF GRIT, AND RELATIVELY HEAVY PARTICLES OF GRIT, SAID METHOD COMPRISING THE STEPS OF POSITIONING A BAFFLE IN SAID TANK PARALLEL TO ONE WALL OF SAID TANK TO DIVIDE IT INTO A FIRST SECTION HAVING AN INLET AND A SECOND SECTION HAVING AN OUTLET, WHEREBY SEWAGE ENTERING SAID FIRST SECTION MUST FLOW UNDER SAID BAFFLE AND UPWARDLY IN SAID SECOND SECTION TO REACH SAID OUTLET, FORCING AIR INTO THE SEWAGE IN SAID FIRST SECTION AT A PLURALITY OF POINTS ALONG A LINE NORMAL TO SAID BAFFLE TO MOVE SAID SEWAGE IN A CIRCULATORY PATH WITHIN SAID FIRST SECTION ABOUT A HORIZONTAL AXIS NORMAL TO SAID BAFFLE AND TO CAUSE SAID HEAVY GRIT TO SETTLE OUT OF SAID SEWAGE TO THE FLOOR OF SAID FIRST SECTION, MOVING SAID HEAVY GRIT ALONG THE FLOOR OF SAID FIRST SECTION TO A DISPOSAL TROUGH, FLOWING SEWAGE, FROM WHICH SAID HEAVY GRIT HAS SETTLED, FROM SAID FIRST SECTION UNDER SAID BAFFLE AND THEN UPWARDLY IN SAID SECOND SECTION AND CONTROLLING THE UPFLOW VELOCITY OF SAID SEWAGE IN SAID SECOND SECTION BY REGULATING THE SPACING OF SAID BAFFLE FROM THE PARALLEL WALL OF SAID TANK TO KEEP THE UPFLOW VELOCITY OF SEWAGE IN SAID SECOND SECTION FROM EXCEEDING THE SUBSIDENCE VELOCITY IN SAID SECOND SECTION OF GRIT OF THE PARTICULAR PARTICLE SIZE.