Case

Phosphorus recovery

At Herning Vand, we have implemented a solution in our WWTP, which helps us reuse sludge that contains a high amount of phosphorus by precipitating struvite.

At Herning Vand, we have implemented a solution in our WWTP, which helps us reuse sludge that contains a high amount of phosphorus by precipitating struvite.

Challenge
– Pipes and valves were clogging at the WWTP

– Precipitation of phosphorus by use of ferric chloride

– Tax dependent on the amount of discharged phosphorus

Solution:
– Controlled precipitation of phosphorus as struvite (from the sludge reject)

– pH-controlling with use of lye (NaOH)

– Adding magnesium chloride (MgCl2) for creating precipitation process

– Drying 1-3 mm pellets and storing in bigbags

Result

– Reduction of internal phosphorus load at the WWTP and thereby reduction in use of ferric chloride

– Tax reduction

– Phosphorus recovery

– Sale of struvite as sustainable fertilizer (PhosphorCare®)

Phosphor Care

Phosphor Care – fertilizer

What is struvite and Phosphorus

  • Struvite consists of phosphorus (12.6%),  magnesium (10%), and nitrogen (5.6%)
  • The Danish Ministry of Environment and Food, has approved struvite as fertilizer
  • Phosphorus is a scarce resource, which is excavated in mines in China, Marrocco and Russia
  • The phosphor resource is expected to be completely depleted in 50-100 years.
  • We expect our struvite facility to produce approx. 200 tonnes of fertilizer a year.
Struvit anlæg - herning vand

Phosphor life circle

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Herning Vand
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Primary contact
Jeanette M. Andersen
99992299

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