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Polonite Nordic AB
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  5. Polonite Phosphorus Filter for Larger ...

Polonite Phosphorus Filter for Larger Applications

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The core in reactive filter beds is so called reactive filter media or reactive sorbent. It is a natural media containing calcium which quickly can react with and uptake a substance that needs to be separated or removed completely. It is usually a mineral based material or residues from the steel and concrete industry. Polonite, xylite, slags or tailings are some examples. Polonite is unbeatable for phosphorus binding and recovery but also for disinfection. The technology is a result of more than 20 years’ research at The Royal Institute of Technology in Stockholm, Sweden. The high pH-value is a special characteristic of the filter media, which is necessary to bind a several different substances, like phosphorus. The reactive filter media reacts chemically with the unwanted substance in the wastewater and binds it to the media’s grainy surface. The more fine-grained the media is and the bigger surface it has, the more will bind into it.

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The requirements on phosphorus removal are increasing and getting stricter. Polonite Nordic’s phosphorus filters, Polonite, binds up to 100% of the phosphorus and is a sustainable alternative as well as a complement to chemical precipitation, primarily in smaller wastewater treatment plants, where chemicals are not an alternative. Levels of phosphorus in incoming water vary between 5 – 20 mg/l. The filter can purify very low levels of phosphorus in the outgoing water, 0,1-0,3 mg/l. The most cost-effective solution are filters for smaller wastewater treatment plants with requirements for 0,5-5 mg/l. The same filter solution can be used for end-polishing as well as phosphorus recovery in reject water.

The solution is to place a phosphorus filter in the end of the treatment process. The installation can be stationary or mobile and where it is possible, the existing basins can be used to lower the investment costs. Polonite Nordic has also developed a container concept with an advanced flow Sequenced Batch Process (SBR) for optimum usage of the filter media. The placement of the containers is adapted to the existing infrastructure and logically optimized. Change and disposal of the used filter media could also be included in the concept, which will be taken care of by a local partner. This means that the saturated filter media with lime, silicon and phosphorus can be recycled on productive soil. (Certification may vary between countries.)

  • Complete P-removal down to 0.1 mg/l (i.e. reduction rate up to 99,9%)
  • Most effective filter based on research at The Royal Institute of Technology, Stockholm
  • Very effective disinfectant – up to 99.9% of bacterial reduction
  • No need for chemicals
  • Saturated filter makes a great fertilizer and soil conditioner
  • Reduced corrosion of existing infrastructure – low maintenance
  • No additional sludge production

Incoming levels of phosphorus may be as high as 200 – 300 mg/l. The more nutrient the higher the efficiency of the filters. Other technologies used for large scale phosphorus recovery often don’t remove enough of the nutrient. Our filters can easily be combined with these technologies and improve the removal rate.