Reduce Ammonia Emissions

In the JHacidificationNH4 + system sulfuric acid is automatically added to slurry to adjust the pH value from about 7 to 5-6. When the pH value of the slurry is lowered ammonia NH3 is converted to ammonium NH4+. Ammonium does not evaporate but stays in the slurry as plant available-N. The treatment reduces ammonia evaporation by up to 64 % on a pig farm and that is:

  1. from the stable
    2. during slurry storage
    3. during application of slurry to fields

Sulfuric acid tank and process tank

Plant Components

A JHacidificationNH4 + system for pigs consists of an acid tank and a process tank to which slurry is automatically pumped from the stables and mixed with sulfuric acid. The system is connected by pipes to the existing stables and the slurry storage tank on the farm.

The process tank is made of concrete. The size of the process tank is adapted to the size of the individual farm. Fitting for the stirrer and the pump in the process tank is made in acid-resistant stainless steel.

Treatment Process

Manure from the stable will automatically be pumped into the process tank and mixed with sulfuric acid from the tank. The treated slurry is then pumped both in the slurry storage tank and back to the stables to also eliminate ammonia evaporation here.

The treated slurry can be distributed directly from the slurry storage tank in fields and can increase agricultural output by up to 15%, because of the increased fertilizer value.

Safety and Function

The JH NH4+ system has a verified ammonia emission reduction efficiency and operational stability according to the VERA test protocols for Livestock Housing and Management Systems.

VERA (Verification of Environmental Technologies for Agricultural Production) was established in 2008 in collaboration between the Danish, Dutch and German environmental and agricultural authorities. Read more about VERA here.


√ Reduction of ammonia evaporation up to 64 %

No limit on protein content of the feed

Increased fertilizer value of manure

Rise in agricultural output up to 15 %

No need to incorporate slurry into grass fields

Minimum manganese deficiency

Less ammonia in the stable air to benefit animal and human health

Contributes to the profit of the owner

Slurry is more homogeneous and easier to handle

The acid tank is placed on a concrete foundation and bollards are concreted to avoid collisions with the tank.

A flow meter registers the annual slurry production and the exact acid consumption per m3 slurry.

The pH value is measured by pH sensors and acid is automatically dosed and mixed into the slurry.