Mark’s municipality cleans the water with ozone

The iron and manganese levels were well below limit values

In Mark’s municipality, citizens receive their water from several small water sources, all with good quality of raw water. The water is purified at the municipality’s waterworks before it is pumped out into the mains to the inhabitants as drinking water.

All wastewater from the residents is taken to the municipal wastewater treatment plant where it is purified in order to be released back into nature again. Manganese is a metal found naturally in groundwater, often together with iron. Groundwater from drilled wells often contains dissolved iron and manganese. The raw water in the groundwater well in Mark’s municipality has levels of iron and manganese that exceed the Swedish Food Agency’s recommendations and are therefore purified before it is distributed to the households.


  • Name:

    Öxabäck waterworks

  • Location:

    Marks municipality, Sweden

  • Industry:

    Municipal water treatment

  • Purpose:

    Iron and manganese reduction

  • Flow:

    260 m3/h


  • Ozonetech RENA high-performance ozone system

  • Dimensions (HxWxD):

    400 x 400 x 200 mm

  • Input power:

    1 kW

  • Noise level:

    49 dB


Waste water treatment plant in Mark's municipality

Wastewater treatment plant in Marks municipality.

The problem

In early 2013, the media reported that Öxabäck’s waterworks had suffered a breakdown which meant that the water could not be purified from manganese. The manganese content was too high, which discolored the water, which, however, was not dangerous for adults to drink. Children and infants, on the other hand, must not drink the water or mix it with formula.

Mellifiq proved to be highly competent in the field of ozone-based purification of water. After a short period of consultation, a new facility could be sized and delivered. Early assumptions about sizing were revised and it was found that a smaller RENA ozone system than initially thought would provide sufficient purification. With Mellifiq’s help, the plant now works well. We ended up well below the manganese limit value.

The solution

Mark’s Municipality contacted us for information on how ozone can be used to purify drinking water. In a short time, a smaller ozone system was installed which, at the very moment it was put into operation, began to purify the water. In connection with commissioning, we made recommendations for optimization of the total system. The plant was optimized, among other things, with regard to the amount of ozone added and the dissolving of ozone into the water.


Ozone works great for purifying manganese from drinking water. The plant was delivered and optimized in a very short time, as the need to clean the drinking water was urgent. Resulting in a cost-efficient and more reliable water treatment system for the municipality.