Technology for N recovery as enriched manure with in-field acidification system using sulphuric acid (ID:277)

Input material
H2SO4 – Sulphuric acid
Output product
NH4, SO4
Processing capacity
+100.000 m3/y pr. system
Technology Status
Available on the market
Keywords
acidification
emission
ammonia
sulphur
biodiversity protection
Technology description

Ammonia (gas) and ammonium (salt) are in a chemical equilibrium when dissolved in a liquid as slurry.  By lowering the pH value, the equilibrium is displaced, and a larger part of the ammonia is to be found as ammonium that cannot evaporate from the slurry.  The SyreN system automatically defines and lowers the pH of the slurry.  It uses sulphuric acid to lower the pH, as this is 100% environmentally balanced product and the most concentrated and effective acid to lower the pH.  The ammonia is thus transformed to ammonium and readily available to the plants after application, when the slurry penetrates the soil.  Ammonium is the optimal N fertilizer available to plants and has a minimal loss to the environment as it has a positive charge and binds itself to soils and does leach out.A VERA verification done by Århus University, has documented a 49 % ammonia emission reduction.  In that trail, 2.5-liter sulphuric acid was used at a pH value of 7.8 and a lowering of the pH to 6.4.  In praxis, a very large variation of acid consumption is to be expected, but on average, about 1 liter of acid is used with cow slurry and 1.5 liter with swine slurry.  This represents a very good correlation between acid consumption and Sulphur.

Basic information

Vendor:
Country:
Denmark
Technology main category:
Physic-chemical nitrogen recovery from manure, digestate and wastewaters: separation, stripping and membrane processes
Technology subcategory:
Chemical addition

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