Upflow filtration and method apparatus for stormwater treatment
View Patent ↗An upflow stormwater filter has horizontally aligned filter media to provide a high throughput for treatment of contaminated water, longer life to filter media, and without material head drop.
1. An upflow separator comprising:
(a) a chamber having top and bottom, with a lower cavity above the bottom, a filter bed above the lower cavity, and an upper cavity above the filter bed;
(b) an inlet for stormwater feeding into the lower cavity;
(c) an outlet for filtered stormwater from the upper cavity;
(d) a bleed opening connected near the bottom of the lower cavity having the size significantly smaller than the inlet.
2. The upflow filter of claim 1 wherein the top has a manway with removable cover and a ladder extending downward into the chamber.
3. The upflow filter of claim 1 wherein the filter media is suspended in a grating between the lower cavity and the upper cavity.
4. The upflow filter of claim 3 wherein the grating above the filter media may be unlocked and removed when changing the filter media.
5. The upflow filter of claim 1 wherein the filter media is selected from the group comprising vermiculite, sand, and leaf mulch.
6. The upflow filter of claim 1 wherein the filter media is treated with an anti-microbial composition.
7. The upflow filter of claim 1 wherein the filter media is treated with additives selected to remediate contaminants in the stormwater.
8. The upflow filter of claim 1 wherein baffles are mounted near the bottom to retard the resuspension of settled particulates.
9. The upflow filter of claim 8 wherein the baffles are operable between a closed or trapping position during high flow conditions and an open particulate receiving position during no flow conditions.
10. The upflow filter of claim 1 wherein stormwater is fed into an inlet connector having about the same relative height as the outlet from the upper cavity, wherein the inlet connector extends downward to the inlet for the lower cavity.
11. The upflow filter of claim 1 wherein the bleed opening has a flow rate of less than 0.1, 0.2, 0.5 or 1.0 gallons per minute.
12. An upflow separator comprising:
(a) a chamber having top and bottom, with a lower cavity above the bottom, a filter bed above the lower cavity, and an upper cavity above the filter bed;
(b) an inlet for stormwater feeding into the lower cavity;
(c) an outlet for filtered stormwater from the upper cavity;
(d) a bleed opening connected near the bottom of the lower cavity having the size significantly smaller than the inlet; and
(e) operable during a stormwater event so that at least about 5, 6, 7, 8, 9, 10, 12, 14, 16, 18 or 20 gallons per minute of stormwater are treated per square foot of filter media surface.