Struvite

When extracting phosphor, struvite turns into money instead of clogged pipes!

Stjernholm has been selected as manufacturer and marketing organisation for a new, epochal facility that turns a problem into a resource – and a future source of income for the purification plant.

The plant has been developed in cooperation with the organisations Aarhus Vand and Herning Vand, as well as the companies Norconsult and Grundfos, for the purpose of extracting struvite (also known as struvite stones) from waste water to prevent clogged pipes, heat exchangers, centrifuges etc.

In addition, it has turned out that the struvite, which is extracted during the process, has a chemical composition and structure that makes it well-suited for use as a phosphor fertiliser, and as we import our entire phosphor consumption (currently 11,000 tons per year), we welcome the possibility of selling the recycled phosphor – called PhosphorCare – as an attractive fertiliser product.

The plant works by sending a slip stream of waste water with a high phosphor and nitrogen concentration through a reactor and adding magnesium salt. Through correct regulation, a phosphor- and nitrogen-containing granulate is precipitated which is an excellent fertiliser with both physical and chemical features similar to mineral fertilisers.

The calculated payback time is less than 7 years – achieved only through operational savings. The income from the sale of PhosphorCare is additional.

When you cooperate with us, you know that we are focusing on delivering a solution to you that adds value to your facility.

STRUVIT – PHOSPHOR RECYCLING

ECONOMY

  • Minimisation of costs related to cleaning and exchange of pipes and exchangers
  • Lower man-hour costs
  • Every savings – prevent performance reductions in pipes and pumps
  • Payback time 4-7 years – depending on the price of pure phosphor
  • 10% sludge reduction

ENVIRONMENT

  • Environmental improvements – recycling of phosphor which is a scarce resource
  • Lower CO2 emissions – any plant 0.05 tons CO2/year

CSR

  • The staff is not required to struggle with struvite removal in pipes and other installations.
  • Work-friendly

Struvite – extraction of phosphor

TURNS A PROBLEM INTO A RESOURCE
LEADS TO LESS NEED FOR PHOSPHOR IMPORT
EXTRACTS 30% PHOSPHOR FROM THE WASTE WATER
ELIMINATES DEPOSIT PROBLEMS IN PIPES, HEAT EXCHANGERS ETC.
PAYBACK TIME OF 7 YEARS ONLY THROUGH OPERATIONAL SAVINGS
POTENTIAL OF A LARGE INCOME FROM THE SALE OF FERTILISER

 Contact us

UlrikUlrik

Ulrik Folkmann

Mobile phone: +45 92 15 22 15
uf@stjernholm.dk

Birkmosevej 1
6950 Ringkøbing
Denmark

Stjernholm@stjernholm.dk
+45 70 20 25 05

CVR: 28 88 49 66

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