Apparatus, systems, and processes employing wet/dry suction filter with chicaned suction head
Water or wastewater filtration systems and processes have a filter tank having a floor and sidewall defining a filtration zone, an influent conduit, and an effluent conduit. One or more filtration members in the tank having filter media, and one or more cleaning apparatus adjacent at least some portions of the filter media. Generating an effluent stream by generating a pressure differential across submerged portions of the filtration media, causing water in the influent to flow from outside to inside the submerged portions of the filter media. A prime mover rotates the filtration members. A blower and chamber for creating a reduced pressure condition in each cleaning apparatus when they are non-submerged, the chamber receiving wet solids removed from non-submerged, wet solids-laden portions of the filter media by the non-submerged cleaning apparatus subsequent to submerged, fouled portions of the filter media being rotated out of the filtration zone. The non-submerged filter media from which wet solids have been removed is further cleansed of collected solids and entrapped water employing air drawn from inside of the one or more drum filters by the blower.
1. An apparatus comprising:
a) a substantially hollow conduit having a length L and a width W, the conduit defining an interior space, the conduit having a suction source opening and at least one suction opening, the at least one suction opening having a length Ls, where 0<Ls<L;
b) a plurality of obstacles threadedly removably attached to the conduit and positioned as a first row of two or more obstacles positioned on a first side of the at least one suction slot opening and a second row of two or more obstacles positioned on a second side of the at least one suction slot opening; and
c) the obstacles in the first row are offset from the obstacles in the second row.
2. The apparatus of claim 1 wherein the substantially hollow conduit comprises a hollow rectangular box having a bottom face in which the at least one suction opening is a slot positioned and dividing the bottom face into a leading surface and a trailing surface.
3. The apparatus of claim 1 wherein each of the plurality of obstacles are round, substantially flat disc shaped with radiused edges.
4. The apparatus of claim 3 wherein all of the plurality of obstacles have same dimensions, and the first row and the second row each have the obstacles evenly spaced.
5. The apparatus of claim 1 further comprising an adjustable blade attached to the conduit that may be heightened or shortened against a profile of the plurality of obstacles to modify open clearance available for tangential cleaning fluid flow, the blade having an edge shape selected from straight-edged, toothed, and arcuate.
6. The apparatus of claim 1 further comprising, in combination, a spray bar and pump to continuously apply an incompressible fluid to block or partially block void spaces between the plurality of obstacles to influence velocities of cleaning fluid(s).
7. A water or wastewater filtration system comprising:
a) a filter tank having a floor and sidewall defining a filtration zone, an influent conduit and an effluent conduit;
b) a filter drum having a filter drum length and radius, the filter drum positioned in the filter tank, the filter drum and the filter tank comprising a filter unit, the filter drum comprising a filter media;
c) one or more apparatus of claim 1 positioned adjacent, or positionable adjacent, at least some portions of the filter media;
d) the filter unit configured to produce, either by gravity-driven hydraulic head, one or more pumps, or both, an effluent stream by generating sufficient pressure differential across submerged portions of the filter media to force water from an influent water or wastewater composition to flow from outside to inside the submerged portions of the filter media and into the effluent conduit;
e) a prime mover for rotating the one or more filtration members; and
f) a blower and chamber for creating a reduced pressure condition in each of the one or more apparatus of claim 1 when adjacent non-submerged portions of the filter media, the chamber configured to receive wet solids removed from non-submerged, wet solids-laden portions of the filter media by the one or more apparatus of claim 1 subsequent to submerged, fouled portions of the filter media being rotated out of the filtration zone, and wherein the non-submerged filter media from which wet solids have been removed is further cleansed of collected solids and entrapped water employing air drawn from inside of the one or more drum filters by the blower.
8. The system of claim 7 wherein the length of the filter drum and the length of the filter tank are related by a ratio ranging from about 1:2 to about 9:10.
9. The system of claim 7 wherein the one or more apparatus of claim 1 is a single apparatus, the length (L) of the apparatus of claim 1 corresponding substantially with the filter drum length.
10. The system of claim 7 wherein the filter media is a pile cloth filter media.
11. A process for treating water or wastewater using the system of claim 7 , comprising:
a) flowing an influent water composition comprising water and solids into the filter tank;
b) producing an effluent stream by generating a pressure differential across submerged portions of the filter media of the filter drum, causing water in the influent water composition to flow from outside to inside the submerged portions of the filter media;
c) rotating the filter drum so that wet, solids-laden submerged portions of the filter media become non-submerged, wet, solids-laden filter media portions; and
d) removing wet solids from the non-submerged, wet, solids-laden filter media portions by reducing pressure in the one or more apparatus of claim 1 , and wherein the non-submerged filter media from which wet solids have been removed is further cleansed of collected solids and entrapped water employing air drawn from inside of the one or more drum filters by the blower.