초록 ▼

A plate is positioned across an inlet to a catch basin and a filter strainer is inserted through an opening through the plate and into the basin. A tertiary filter completely surrounds the strainer and is suspended below the plate. Surface water flows through a primary grate that covers the catch ba

A plate is positioned across an inlet to a catch basin and a filter strainer is inserted through an opening through the plate and into the basin. A tertiary filter completely surrounds the strainer and is suspended below the plate. Surface water flows through a primary grate that covers the catch basin, through the strainer and through the tertiary filter. The tertiary filter comprising fibrous filter media retained in a non-woven mesh fabric enclosure and the filter media is selected according to the type of contaminants that are to be removed.

대표청구항 ▼

1. A surface water filtration apparatus for use with a catch basin connected to an outflow, comprising: a removable plate configured for insertion into said catch basin and for being retained therein to define a catch basin interior beneath said removable plate, said plate having first opening there

1. A surface water filtration apparatus for use with a catch basin connected to an outflow, comprising: a removable plate configured for insertion into said catch basin and for being retained therein to define a catch basin interior beneath said removable plate, said plate having first opening therethrough and a second opening therethrough with a removable cover for selectively opening a closing said second opening;a removable grate defining a primary water filter;a perforate strainer extending through said first opening through said plate and into said catch basin interior, said perforate strainer having an open upper end, mesh side walls and an imperforate closed lower end and said strainer defining a secondary water filter;a tertiary water filter extending into said catch basin interior such that said tertiary water filter surrounds said perforate strainer, said tertiary water filter comprising mesh fabric material for filtering contaminants passing through said primary and said secondary water filters between said inner and outer layers of mesh fabric material;wherein said water filtration apparatus defines a first water flow path through said primary, secondary and tertiary filters and wherein said second opening through said removable plate defines an access port to water that has flowed through said primary, secondary and tertiary filters. 2. The surface water filtration apparatus according to claim 1 wherein the opening through said plate is further defined by a downwardly and inwardly sloping shoulder that defines a first upper diameter and a second, smaller diameter at a lower edge of the shoulder, and wherein the perforate strainer comprises a cylindrical member having rigid or semi-rigid mesh material side walls and a solid bottom surface. 3. The surface water filtration apparatus according to claim 2 in which the tertiary water filter is defined by a cylindrical member having an open upper end and a closed bottom end. 4. The surface water filtration apparatus according to claim 3 wherein said tertiary water filter includes a ring extending around the upper open end and said ring defines a diameter that is greater than said second diameter and smaller than said first diameter. 5. The surface water filtration apparatus according to claim 4 in which the ring is split and has a sleeve attached to one end, the opposite end of the ring being insertable into the sleeve such that when the opposite end of the ring is inserted into the sleeve the diameter of the ring is fixed. 6. The surface water filtration apparatus according to claim 1 wherein the catch basin is defined by an in-ground vault. 7. The surface water filtration apparatus according to claim 1 including a seal strip extending around a periphery of the removable plate to form a seal between the removable plate and the catch basin. 8. The surface water filtration apparatus of claim 1 wherein said apparatus defines a second water flow path in which water in the second flow path does not pass through the secondary or tertiary water filters, said second water flow path is defined by an overflow opening in an upwardly extending portion of the removable plate such that said overflow opening is above the level of the removable plate. 9. The surface water filtration apparatus of claim 8 wherein the overflow opening defines a weir. 10. The surface water filtration apparatus according to claim 1 wherein the perforate strainer includes a handle attached thereto. 11. In a catch basin for collection of run-off water, said catch basin having a water holding vault, an inlet opening into said vault with a removable grate covering said inlet for removing relatively large objects from run-off water, and an outlet through which run-off water flowing into said vault exits into a sewer or dry well, the catch basin defining a water flow path from the water source through the grate and into the water holding vault, and through the outlet and into a sewer or dry well, the improvement comprising: a grate defining a first filter;a plate retained in the catch basin below the grate, said plate having a circular opening therethrough and said plate defining an enclosed area in the water holding vault below said plate, and an inwardly and downwardly sloping shoulder extending around said circular opening;a second filter interposed in the flow path between said grate and said outlet opening such that water flowing into said opening flows through said second filter, said second filter adapted for filtering relatively smaller particulate debris than said grate and said second filter defined by an enclosed cylindrical rigid or semi-rigid tube extending into the enclosed area below said plate and said tube having mesh side walls and an imperforate bottom wall;a third filter interposed in the flow path between said second filter and said outlet opening, said third filter adapted for filtering relatively smaller debris than said second filter and said third filter substantially surrounding the mesh material below said plate and wherein said third filter is suspended from said plate. 12. The apparatus according to claim 11 wherein the second filter is supported by and removable from said plate. 13. The apparatus according to claim 12 wherein said third filter is has a fixed-diameter cylindrical ring member at an open upper end thereof that is adapted for suspending the third filter from the inwardly and downwardly sloping shoulder. 14. The apparatus according to claim 13 wherein opening in the plate defines a first diameter and a second, smaller diameter at a lowermost edge of the inwardly and downwardly sloping shoulder, and wherein diameter of the fixed-diameter ring is between the first diameter and the second diameter. 15. A method of removing contaminants from run-off water, comprising the steps of: (a) inserting into a catch basin a plate to define an insert space beneath said plate, and said plate having a first opening therethrough and a second opening therethrough, the second opening having a removable cover for selectively opening and closing said second opening;(b) suspending from the plate and through the first opening a flexible filter comprising media selected for the ability to filter components from the run-off water as water flows through said flexible filter and such that the flexible filter is suspended in the insert space below said plate, said flexible filter defining a body having central opening at an upper end, sides and a bottom; and(c) inserting a rigid or semi-rigid strainer having a closed bottom surface into the central opening of said flexible filter, so that said flexible filter conforms to an outer surface of said strainer. 16. The method of claim 15 whereby said steps (a) through (c) define a first water flow path in which run-off water flowing into said catch basin flows, sequentially, through said grate, through said strainer, through said filter, and wherein said run-off water flows out of said catch basin through a catch basin outlet. 17. The method of claim 16 including the step of including filter media with the filter and selecting the filter media according to impurities desired to be removed from said water. 18. The method of claim 15 including the step of defining a second water flow path in which run-off water flows through said grate and through the catch basin outlet but does not flow through said strainer or said flexible filter. 19. The method of claim 18 including the step of attaching the filter to the plate with a fixed diameter ring.