Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
323 words
A SEWAGE TREATMENT INSTALLATION COMPRISING AN OPENTOPPED ACTIVATED SLUDGE SEWAGE AERATION TREATMENT CHANNEL HAVING A BOTTOM AND SIDES FROMING AN ENDLESS CLOSED LOOP PATH WHICH PROVIDES A VARIABLE VOLUME ACTIVATED SOLUDGE TREATMENT RESERVOIR FOR CONTAINING AND TREATING A MIXED LIQUOR OF SEWAGE AND ACTIVATED SLUDGE INCLUDING MICROORGANISM AND SUSPENDED SOLIDS, A DELIVERY DEVICE FOR DELIVERING SWAGE, WHICH IS AT MOST PARTIALLY TREATED, INTO THE ACTIVATED SOLUDGE TREATMENT CHANNEL AT ONE LOCATION ALONG THE PATH AT VARIABLE VOLUME RATES WHICH CAN CHANGE FROM MOMENT TO MOMENT DURING A PREDETERMINED DAILY TIME PERIOD AND WHICH GENERALLY CORRESPOND TO THE NORMAL VARIATIONS IN VOLUME RATES AT WHICH SUCH SEWAGE IS RECEIVED FROM A SOURCE OF SEWAGE TO BE TREATED, SUCH AS A RAW SEWAGE COLLECTION SYSTEM, A DEVICE FOR CONTINUOUSLY CIRCULATING THE SEWAGE WITH ACTIVTED SOLUDGE AS MIXED LIQUOR IN ONE DIRECTION AROUND THE CLOSED LOOP PATH IN THE ACTIVTED SLUDGE TREATMENT CHANNEL AT A LINEAR RATE OF FLOW PREVENTING UNDESIRED SETTLING OUT OF SUSPENDED SOLIDS IN THE CHANNEL, AT LEAST ONE SLUDEGE SETTLING TANK FOR RECEIVING MIXED LIQUOR AND SEPARATING IT INTO SLUDGE AND REMAINING CLEAR LIQUID EFFLUENT, AND A SUBSTANTIALLY CONSTANT RATE FEEDING DEVICE FOR FEEDING MIXED LIQUOR FROM A SECOND LOCATION ALONG THE PATH IN THE ACTIVATED SLUDGE TREATMENT CHANNEL TO SUCH SLUDGE SETTLING TANK DURING SUCH PREDETERMINED DAILY TIME PERIOD AT A SUBSTANTIALLY CONSTANT VOLUME RATE AT LEAST EQUAL TO THE AVERAGE OF THE VARIABLE COLUME RATES AT WHICH THE SEWAGE IS INITIALLY DELIVERED BY THE DELIVERY DEVICE TO THE ACTIVATED SLUDGE TREATMENT RESERVOIR DURING SUCH PERIOD, SAID INSTALLATION INCLUDING MEANS FOR AERATING THE MIXED LIQUOR IN THE AERATION TREATMENT CHANNEL AND OVERFLOW MEANS FOR FEEDING MIXED LIQUOR FROM THE TREATMENT CHANNEL TO THE SLUDGE SETTLING TANK AT A HIGHER RATE THAN SAID SUBSTANTIALLY CONSTANT VOLUME RATE WHENEVER THE DEPTH OF THE LIQUOR IN SAID CHANNEL EXCEEDS A PREDETERMIND MAXIMUM LEVEL TO PREVENT THE CHANNEL FROM OVERFLOWING INTO ANY ADJACENT LAND AREA.
Claim 2
Dependent Claim
323 words
A SEWAGE TREATMENT INSTALLATION COMPRISING AN OPENTOPPED ACTIVATED SLUDGE SEWAGE AERATION TREATMENT CHANNEL HAVING A BOTTOM AND SIDES FROMING AN ENDLESS CLOSED LOOP PATH WHICH PROVIDES A VARIABLE VOLUME ACTIVATED SOLUDGE TREATMENT RESERVOIR FOR CONTAINING AND TREATING A MIXED LIQUOR OF SEWAGE AND ACTIVATED SLUDGE INCLUDING MICROORGANISM AND SUSPENDED SOLIDS, A DELIVERY DEVICE FOR DELIVERING SWAGE, WHICH IS AT MOST PARTIALLY TREATED, INTO THE ACTIVATED SOLUDGE TREATMENT CHANNEL AT ONE LOCATION ALONG THE PATH AT VARIABLE VOLUME RATES WHICH CAN CHANGE FROM MOMENT TO MOMENT DURING A PREDETERMINED DAILY TIME PERIOD AND WHICH GENERALLY CORRESPOND TO THE NORMAL VARIATIONS IN VOLUME RATES AT WHICH SUCH SEWAGE IS RECEIVED FROM A SOURCE OF SEWAGE TO BE TREATED, SUCH AS A RAW SEWAGE COLLECTION SYSTEM, A DEVICE FOR CONTINUOUSLY CIRCULATING THE SEWAGE WITH ACTIVTED SOLUDGE AS MIXED LIQUOR IN ONE DIRECTION AROUND THE CLOSED LOOP PATH IN THE ACTIVTED SLUDGE TREATMENT CHANNEL AT A LINEAR RATE OF FLOW PREVENTING UNDESIRED SETTLING OUT OF SUSPENDED SOLIDS IN THE CHANNEL, AT LEAST ONE SLUDEGE SETTLING TANK FOR RECEIVING MIXED LIQUOR AND SEPARATING IT INTO SLUDGE AND REMAINING CLEAR LIQUID EFFLUENT, AND A SUBSTANTIALLY CONSTANT RATE FEEDING DEVICE FOR FEEDING MIXED LIQUOR FROM A SECOND LOCATION ALONG THE PATH IN THE ACTIVATED SLUDGE TREATMENT CHANNEL TO SUCH SLUDGE SETTLING TANK DURING SUCH PREDETERMINED DAILY TIME PERIOD AT A SUBSTANTIALLY CONSTANT VOLUME RATE AT LEAST EQUAL TO THE AVERAGE OF THE VARIABLE COLUME RATES AT WHICH THE SEWAGE IS INITIALLY DELIVERED BY THE DELIVERY DEVICE TO THE ACTIVATED SLUDGE TREATMENT RESERVOIR DURING SUCH PERIOD, SAID INSTALLATION INCLUDING MEANS FOR AERATING THE MIXED LIQUOR IN THE AERATION TREATMENT CHANNEL AND OVERFLOW MEANS FOR FEEDING MIXED LIQUOR FROM THE TREATMENT CHANNEL TO THE SLUDGE SETTLING TANK AT A HIGHER RATE THAN SAID SUBSTANTIALLY CONSTANT VOLUME RATE WHENEVER THE DEPTH OF THE LIQUOR IN SAID CHANNEL EXCEEDS A PREDETERMIND MAXIMUM LEVEL TO PREVENT THE CHANNEL FROM OVERFLOWING INTO ANY ADJACENT LAND AREA.
Claim 3
Dependent Claim
80 words
A sewage treatment installation according to claim 1 in which the device for circulating the sewage includes at least one device located at the surface of liquid in the channel and having a construction causing the relative movement of the mixed liquor in said one direction and also constituting at least part of the means for aerating the mixed liquor, said one circulating device being located along said path downstream from said delivery device and upstream from said feeding device.
Claim 4
Dependent Claim
41 words
A sewage treatment installation according to claim 2 including means normally preventing the constant rate feeding device from feeding mixed liquor out of the channel whenever the depth of the liquor in said channel is lower than a predetermined minimum level.
Claim 5
Dependent Claim
28 words
A sewage treatment installation according to claim 1 in which the overflow means comprises a high volume rate overflow conduit which effective bypasses the constant rate feeding device.
Claim 6
Dependent Claim
53 words
A sewage treatment installation according to claim 1 in which the channel side walls have a cross-sectional shape providing a greater volume increase in the channel for a given increase in liquid depth near the top of the channel than for a corresponding increase in liquid depth near the bottom of the channel.
Claim 7
Dependent Claim
70 words
A sewage treatment installation according to claim 1 wherein said at least one sludge settling tank comprises a first sludge settling tank for receiving mixed liquor from said channel and separating it into sludge and relatively clear liquid effluent and a second sludge settling tank for receiving said relatively clear liquid effluent from said first sludge settling tank and further separating it into sludge and said remaining clear liquid effluent.