Systems and Methods for Removing Volatile Compounds from Water-Storage Tanks
A system for reducing an amount of volatile organic compounds which includes: a water-storage tank having a tank containing water, a roof positioned over the tank, and a headspace region formed between the roof and a surface of the water contained in the tank; an air exchange system positioned at least partially in the headspace region that is configured to exchange air exterior to the tank with air inside the tank; and a water conveyance device located at least partially in the water of the water-storage tank and which is configured to convey water in a manner that produces a surface flow velocity. A method reducing an amount of volatile organic compounds is also included.
1 . A system for reducing an amount of volatile organic compounds comprising:
a water-storage tank comprising a tank containing water, a roof positioned over the tank, and a headspace region formed between the roof and a surface of the water contained in the tank;
an air exchange system positioned at least partially in the headspace region that is configured to exchange air exterior to the tank with air inside the tank; and
a water conveyance device located at least partially in the water of the water-storage tank and which is configured to convey water in a manner that produces a surface flow velocity,
wherein the air exchange system comprises an active air ventilation device configured to facilitate the movement of air exterior of the water-storage tank directly into the headspace region above the surface of the water, and
wherein the active air ventilation device comprises a deflector that deflects the air exterior of the water-storage tank entering the headspace region in a direction that is non-perpendicular to the water surface.
2 . The system of claim 1 , wherein the water conveyance device is configured to convey water to the water surface.
3 . The system of claim 1 , wherein the tank has a floor and the water conveyance device is configured to exchange water at or toward the floor of the tank with water at or toward the water surface.
4 . The system of claim 3 , wherein the water conveyance device circulates water around the tank.
5 . The system of claim 1 , wherein the water conveyance device is completely submerged in the water when the tank is in use.
6 . The system of claim 5 , wherein the water conveyance device is attached to or sits upon the floor of the tank.
7 . The system of claim 1 , wherein the air exchange system comprises a port that enables air to flow out of the water-storage tank.
8 . The system of claim 1 , wherein the active air ventilation device is configured to facilitate the movement of air exterior of the water-storage tank into the headspace region substantially across the water surface.
9 . The system of claim 1 , wherein the active air ventilation device comprises air vents that fluidly connect the air exterior of the water-storage tank to the headspace region.
10 . The system of claim 9 , wherein the active air ventilation device comprises at least one screen that is positioned over at least one of the air vents.
11 . The system of claim 1 , wherein the active air ventilation device comprises an air moving device.
12 . The system of claim 11 , wherein the air moving device is a fan.
13 . The system of claim 1 , wherein the water conveyance device comprises a mixer having blades.
14 . The system of claim 11 , wherein the deflector is in fluid communication with the air moving device.