Our self-breathing odor filters are used to control odors coming from sewage pumping stations, wastewater basins and the like. Inside the odor filter is a filter bag that is filled with Oxi-beads or activated carbon beads.
General application of FILTERMAT odor filters.
By placing the filter e.g. on the deck of the pumping station or basin, often on a vent, polluted air flows, due to level rises, are routed through the filter.
The Filtermat odor filter was developed in part to combat nuisances caused by small or large amounts of H2S.
THE ACTION OF THE OXIDE GRANULES
Our Oxikorrels are a unique combination of activated alumina (Al2O3) impregnated with potassium permanganate (KMnO4 – the purple substance in the Oxikorrels) and a small amount of free water (H2O). It is produced in the form of light purple colored spheres with a diameter of approx. 5 mm.
A two-stage process takes place on the surface of the grains. First, the contaminated molecules are absorbed on the microporous surfaces of the beads. Then the odor-causing and corrosive gases (H2S) penetrate through the microporous surface into the pellet, after which a chemical oxidation process takes place by the reagents present in the pellets, without producing vapors.
The unsaturated hydrocarbons and organic compounds oxidize to CO2 and H2O. Hydrogen sulfide (H2S ) is bound in the form of potassium or manganese sulfate or remains in the pellet as elemental sulfur. The spent pellets are harmless and can be disposed of with household, garden and kitchen waste.
When using Oxik granules on buffer cellar vents, one will generally not proceed to replace the granules until the filter begins to let through odors to a noticeable degree. How often this should be done per year depends entirely on the amount of air passing through the filter and the concentration of gases to be oxidized in it. The maintenance of a filter system equipped with Oxikorrels is limited to taking a sample of grains at regular intervals, after which it can be checked in a very simple visual way whether the grains are still active: at the moment that no purple color is visible anymore, the grains are finished; a number of grains should be crushed so that especially the inside of the grain can be checked for color indication. Occasionally shaking up the pellets gives better yields. In our new granules, the life span has been extended by increasing the amount of active ingredient in the granules and surface area enlargement.
- Color gradient : purple, yellowish, light brown, dark brown, black, gray and finally white
- Whole purple : 100% operation
- Brown in color : 80% active effect still present
- All white : 0% operationPlacement
The odor filters should be mounted on a horizontal surface (e.g., a concrete deck or sealing hatch) and can be mounted over the existing vent if necessary.
DESIGNS AND TYPES
The standard version is made of very sturdy PVC. If necessary, the building owner can install a stainless steel or concrete enclosure with a door and air holes over the odor filter.
Different models are available:
- TPFDSK07PVC-DN100 Max. recommended flow rate 200 l/h air – D = 250 mm – H = 495 mm
- TPFDSK11PVC-DN150 Max. recommended flow rate 500 l/h air – D = 400 mm – H = 500 mm
- TPFDSK15HDPE Max. recommended flow rate 1200 l/h air – D = 800 mm – H = 700 mm
- TPFDSK16HDPE Max. recommended flow rate 1500 l/h air – D = 800 mm – H = 1000 mm
The odor filters are fitted with a filter bag containing Oxi-beads or activated carbon pellets or a special mixture.
Other flow rates and special designs on request.
The larger type odor filters are made of highly robust, impact-resistant High Density Poly Ethylene. According to our findings, this construction made of HDPE is much better than one made of stainless steel or aluminum. Experience has taught us that the complex chemical gases present in wastewater can also corrode stainless steel !
Among other things, our special purple Oxikorrels will bring H2S concentration below 0.1 ppm. The chemiesorption reaction gives a discoloration from purple to brown to black and white so that the replacement time can be easily determined. They also remove sulfur dioxide, mercaptans, amines, aldehydes, etc., making them excellent for treating gases in wastewater treatment plants. It is, of course, important to have sufficient contact time and product to achieve the desired result and acceptable tool life.
Max. recommended flow rate 30,000 l/h air – D = 270 mm – H = +/- 538 mm
Max. recommended flow rate 150,000 l/h air – D = 420 mm – H = 645 mm