Abstract Elimination of heavy solids such as grit from sewage streams prior to introduction into treatment tanks is necessary because such solids interfere with normal operations. Substantially all of the heavy solids, irrespective of particle size are removed by a process and apparatus wherein raw sewage is introduced into a tank, the preferred form of which has a bottom sloping downwardly from the far side to a trough adjacent a first side wall, with even distribution along said first side wall, a predetermined small range of liquid level variation is maintained by flowing effluent sewage over a weir extending above the full length of the top of the side wall opposite said first side wall, air is introduced with even distribution adjacent to said trough and along said first side wall to induce circulatory flow of liquid and light weight solids upwardly and then in the direction of said opposite side wall, turning the circulatory flow direction downwardly toward the tank floor by a baffle spaced from said opposite side wall and positioned transverse to the direction of liquid flow through said tank, to effect separation of light weight solids and flowing the sewage suspension under said baffle and upwardly for removal by flow over said weir.
Inventors
👤 H Brociner
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-03 02:21
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/24
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
37 words
A method according to claim 1 wherein said uniform distribution of sewage in the tank is attained through ports spaced along said first side wall and communicating with the channel extending the length of said inlet wall.
Claim 2
Dependent Claim
51 words
A method according to claim 1 wherein scum accumulating at the surface of liquid in said tank and moving in response to the circulatory flow of liquid is directed to the outlet channel by flow through ports adjacent the top of said baffle, said ports being provided with adjustable closure means.
Claim 3
Independent Claim
253 words
An apparatus for removing grit and other particulate solids of relatively high specific gravity from a liquid containing same in suspension comprising a tank having a sloping bottom and a plurality of end and side walls, inlet means spanning the full length of one of said side walls for uniform distribution of influent suspension, a trough in said bottom extending completely along Said tank adjacent said side inlet wall, an overflow weir for maintaining a desired level of liquid in said tank extending the full length of and positioned at the top of the side wall opposite said inlet wall, and an outlet for the liquid communicating therewith, means for introducing air into the body of liquid from a region above said trough extending the full length of and adjacent said inlet wall to circulate the liquid in a generally vertical plane in the direction of said overflow weir, and to wash heavy solids which settle out of said liquid along said tank bottom sloping from said outlet wall to said trough, conveying means for removing solids from said trough, a baffle extending completely along said tank parallel to said wall topped by said overflow weir having its upper edge extending above the maximum liquid level and its lower edge spaced adjacent said floor to provide an exit for liquid flow upwardly behind said baffle to said outlet, and a fillet with surface extending downwardly from said side wall topped by said weir to a point below the lower edge of said baffle.
Claim 4
Dependent Claim
47 words
Apparatus according to claim 4 wherein ports are provided adjacent the top of said baffle, said ports having a height adapted for passage of liquid whatever the limited liquid level variation in said tank and gates associated with said ports for control of flow of scum therethrough.