Hydrogen Sulphide Filters
Hydrogen sulphide (H2S) is a gas which if dissolved in water smells like rotten eggs. The easiest way to remove the smell of small amounts is to aerate the water or pass it through carbon. In conventional carbon filters the carbon gets saturated and regularly needs replacing. In this novel system the H2S is sprayed through a layer of air held in the top of the vessel oxidising the gas vastly improving the capacity of the carbon reducing the need and cost of replacement carbon.
The idea of the system is to oxidize the income water for sulphur removal, 5 ppm max (carbon). This is accomplished by creating a head of air in a tank which the water passes through which oxidizes the contaminate.
As the water flows into the tank (through a top basket) it will pass through a boundary layer of water, down through the media to the outlet.
Regeneration of unit is every 2 or 3 days. As the sulphur or iron is oxidized, reduction of the air head occurs. The more frequent regeneration keeps our air head in the tank.
Position 1: Backwash
Backwash flow control sized as a normal filter 8-10 GPM/Sq. Ft. Area. Backwash 8-12 Minutes
Position 2: Brine Draw as we normally know it. This will now be Air Draw. Allow unit to enter brine draw position. This will evacuate the tank of water.
Return to service.
Note: Upon returning to service, the inlet water will enter the tank and compress the air within it. The water entering the tank compresses the air and will stop flowing into the unit once the pressure equalizes. Once the pressure equalizes, usually the water level in the tank is around 14 from the top of the tank, creating a 14 dome of air.
An inlet check valve is required to hold the air in the tank not allowing it to escape out the inlet.
A screen (to keep bugs out) the injector clean and check valve is required on the brine connection so as the controller passes by the brine refill port on the way to service we do not shoot water out the air screen assembly.
Assembly note: Because of the air head and boundary layer of water, we use less media to give extra freeboard in the tank.
Installation Note: Drain must be secure, when unit first goes into backwash air is discharged down the drain. This can cause drain line to jump around if not secure.
Upon initial start up of equipment, it is best to soak the media in water (for 24 hrs.) before applying a full backwash to unit.