Mixture for reducing the formation of magnesium ammonium phosphate (struvite) in clarification plants
AssigneeTechnische Universität Darmstadt
InventorsPeter Cornel, Sebastian Petzet
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Abstract
The invention describes a method to prevent the formation of struvite in wastewater treatment plants. For that purpose, calcium silicate hydrate (CSH) is metered out into the excess sludge.
Claims9
Method for the production of a mixture to reduce the formation of magnesium ammonium phosphate (MAP) in wastewater treatment plants, wherein the following steps occur:
- Addition of calcium silicate hydrate (CSH) to stationary or flowing sludge using a dosage of calcium silicate hydrate (CSH) within a range from 0.001 g to 1 g per dry amount of sludge, so that the pH value in the sludge increases by a maximum of 0.8,
- Mixing the CSH with the sludge.
A substance mixture to reduce the formation of magnesium ammonium phosphate (MAP) in wastewater treatment plants, wherein the mixture comprises sludge from one waste treatment plant and calcium silicate hydrate (CSH) in a ratio 100:1 to 0.5:1, wherein the ratio is referred to the dry amount of sludge.
Dependencies are inferred from the claim text.