Storm Water Filtration System

Abstract

The invention relates to a storm water filtration system comprising: (i) a storm water drain pit ( 12 ); (ii) a filtering well ( 1 ) for filtering storm water; (iii) a storm water collection system ( 7 ) for storing filtered storm water: wherein the filtering well comprises: an inlet ( 2 ) for storm water to enter the filtering well; wherein the inlet ( 2 ) is in fluid communication with the storm water drain pit; an outlet ( 3 ) for filtered storm water to exit the filtering well; wherein the outlet ( 3 ) is in fluid communication with the storm water collection system ( 7 ); a filter ( 4 ) comprising man-made vitreous fibres (MMVF) for removing particles from the storm water, wherein the filter ( 4 ) divides the filtering well ( 1 ) into an inlet chamber ( 5 ) and an outlet chamber ( 6 ) such that storm water enters via the inlet ( 2 ) into the inlet chamber ( 5 ), passes through the filter ( 4 ) into the outlet chamber ( 6 ) and exits via the outlet ( 3 ). The invention also relates to a method of filtering and storing storm water using a storm water filtration system as described herein and a method of installing a storm water filtration system as described herein.

1 . A storm water filtration system comprising:
 (i) a storm water drain pit;   (ii) a filtering well for filtering storm water;   (iii) a storm water collection system for storing filtered storm water; wherein the filtering well comprises;   an inlet for storm water to enter the filtering well; wherein the inlet is in fluid communication with the storm water drain pit;   an outlet for filtered storm water to exit the filtering well; wherein the outlet is in fluid communication with the storm water collection system;   a filter comprising man-made vitreous fibres (MMVF) for removing particles from the storm water, wherein the filter divides the filtering well into an inlet chamber and an outlet chamber such that storm water enters via the inlet into the inlet chamber, passes through the filter into the outlet chamber and exits via the outlet.   
     
     
         2 . The storm water filtration system according to  claim 1 , wherein the storm water collection system is an infiltration system that allows the filtered storm water to infiltrate into surrounding ground. 
     
     
         3 . The storm water filtration system according to  claim 1 , wherein the filter has a density in the range of 40 to 250 kg/m 3 . 
     
     
         4 . The storm water filtration system according to  claim 1 , wherein the man-made vitreous fibres in the filter have a geometric fibre diameter of 1.5 to 10 microns. 
     
     
         5 . The storm water filtration system according to  claim 1 , wherein the filter comprises coherent man-made vitreous fibres (MMVF) bonded with a cured binder composition. 
     
     
         6 . The storm water filtration system according to  claim 1 , wherein the filter has a contact angle with water of less than 90° and/or a hydraulic conductivity of 5 m/day to 300 m/day, preferably 50 m/day to 200 m/day. 
     
     
         7 . The storm water filtration system according to  claim 1 , wherein the filtering well further comprises an air vent in fluid communication with the storm water collection system such that air displaced from the storm water collection system passes into the filtering well via the air vent. 
     
     
         8 . The storm water filtration system according to  claim 1 , wherein the filter further comprises a frame for support. 
     
     
         9 . The storm water filtration system according to  claim 1 , wherein the filtering well further comprises a guide for holding the filter in position. 
     
     
         10 . The storm water filtration system according to  claim 1 , wherein the filtering well is in the shape of a cylinder, cube or cuboid. 
     
     
         11 . The storm water filtration system according to  claim 1 , wherein the filtering well further comprises a lid. 
     
     
         12 . The storm water filtration system according to  claim 1  positioned under a ground. 
     
     
         13 . The storm water filtration system according to  claim 1 , wherein the storm water collection system comprises one or more drain elements, wherein the drain element comprises man-made vitreous fibres bonded with a cured binder composition. 
     
     
         14 . The storm water filtration system according to  claim 1 , wherein the storm water drain pit comprises;
 an inlet for storm water to enter the storm water drain system;   a sedimentation chamber for sedimentation of debris from the storm water;   an outlet, for storm water to exit the storm water drain pit, wherein the outlet is in fluid communication with the inlet of the filtering well.   
     
     
         15 . The storm water filtration system according to  claim 14 , wherein the storm water drain pit further comprises a separation element for separating the sedimentation chamber from the outlet, and wherein the outlet is positioned above the sedimentation chamber and below the inlet. 
     
     
         16 . The storm water filtration system according to  claim 1 , wherein the storm water filtration system is a self-contained storm water filtration system. 
     
     
         17 . A method of filtering and storing storm water comprising the steps of:
 providing a storm water filtration system according to  claim 1 ;   allowing storm water to enter the storm water drain pit for coarse filtration;   allowing water to flow from the storm water drain pit into the inlet chamber of the filtering well via the inlet;   allowing the storm water to pass from the inlet chamber to the outlet chamber through the filter; and   allowing the filtered storm water to exit the filtering well via the outlet into the storm water collection system for storage.   
     
     
         18 . A method of installing a storm water filtration system, comprising the steps of;
 identifying a storm water drain pit in the ground or positioning a storm water drain pit in the ground;   positioning a filtering well in the ground, wherein the filtering well comprises;
 an inlet for storm water to enter the filtering well; wherein the inlet is in fluid communication with the storm water drain pit; 
 an outlet for filtered storm water to exit the filtering well; 
 a filter comprising man-made vitreous fibres (MMVF) for removing particles from the storm water, wherein the filter divides the filtering well into an inlet chamber and an outlet chamber such that storm water enters via the inlet into the inlet chamber, passes through the filter into the outlet chamber and exits via the outlet; and 
   positioning a storm water collection system in ground, wherein the outlet of the filtering well is in fluid communication with the storm water collection system.   
     
     
         19 . The storm water filtration system according to  claim 11 , wherein the lid comprises a water impermeable top face and at least one perforation at a side face. 
     
     
         20 . The storm water filtration assembly according to  claim 12 , which is positioned under a road or pavement.