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Oxidation Initiated by Venturi Nozzle

A form of oxidizing agent is through the use a venturi nozzle to add air (oxygen) to water in order to precipitate and remove iron (Fe) and Manganese (Mn).


For those that prefer not to add "foreign" chemicals to their water supply in order to remove iron and manganese the venturi systems fits the bill. This method is effective for very high levels of iron (Fe) and Manganese (Mn).  

Ordinary air is added to the water by a special venturi nozzle. The mixture of air and water then pass into a detention tank where the oxygen dissolves into the water. Oxygen  is used to oxidize iron, manganese and hydrogen sulphide.  Systems will consist of 3 parts: Venturi, air release tank, and filter tank.  An air release valve allows the unused nitrogen and excess air to bleed off.  The water then enters the media filter tank filled with a media catalyst called "brim", Filter Ag, and Pyrolox.   The  media acts as a catalyst to force the completion of the chemical reaction between the dissolved oxygen and Fe/Mn so as to form Fe/Mn rust particles.  The precipitates are then physically caught by the catalyst media which is backwashed periodically to remove the precipitates  Chemical rejuvenation of the media is not required.

Considerations:

  • No chemicals are added to the water.
  • Handles a wide range of Fe/Mn levels.
  • Reduces some objectionable odor.

The pH should be over 7.0+ for iron and 8.0+ for manganese. If both Fe/Mn are substantially present, the pH should be under 8.5 so as to not produce colloidal iron.

Organic material should be less than 5 ppm. Effectiveness of the birm media will be reduced by long term exposure to chlorine.  Manufacturer's recommend that tannins and hydrogen sulphide should be low.

The precipitate of Fe/Mn tends to lower the pH and thus the alkalinity or pH adjustment may be needed.

Other manufacturer comments recommend that tannins and hydrogen sulphide should be low. These other contaminants will produce a precipitate that fouls the media. Organic material should be less than 5 ppm. Effectiveness of the birm media will be reduced by long term exposure to chlorine however, short term chlorination to kill Fe/Mn bacteria is acceptable. No appreciable phosphate should be present.  An "enriched" media is often necessary to remove manganese.

A pre-filter, often in the form of bag filtration is often used to remove iron and manganese which has already oxidized ad it came from the well. 

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Last modified: November 13, 2018