Good to know about Active NS for biogas plants

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Reception pits

Add 20 g of Active NS per m3 of slurry in the reception pit and agitate vigorously before pumping into the storage tank. If Active NS is used all the time, regularly add 20g of Active NS per m3 of slurry added since the previous treatment. Agitate before pumping the slurry into the storage tank.

Storage tanks

Use 20 g of Active NS per m3 of slurry in the storage tank. Add Active NS before or at the same time as agitating the storage tank. If there is a floating crust on the storage tank, puncture it with the agitator. Pour the Active NS directly down by the agitator to make sure the Active NS mixes thoroughly with the slurry right away. This produces the best effect.


Lagoons can be a challenge as it is usually pumped around the lagoon. Add Active NS with 20 g per. m3 slurry in the lagoon. Thereafter, the pump is pumped vigorously so that the precipitate is processed and Active NS is mixed.
Since the precipitate is often very solid, it is supposed to drain the lagoon 3 times before it is completely empty. Active NS must be applied to all new slurries that have not been treated to get the maximum effect.

For how long does Active NS remain effective?

After being added to the reception pit and the slurry tank, Active NS stays active for more than a year, but more Active NS should be added whenever new, untreated slurry is introduced. Use 20 g per m3 of slurry added.  You should always thorough agitation the tank before starting to offload the slurry.

Here are a few guidelines that must always be adhered to at the outset, as the bacteria that develop the gas are highly sensitive to change. Furthermore, the amount of sediment in the tank is not known. For this reason, do not simply start by adding 20 g of Active NS per m3 in the reception pit, as this could harm the bacteria and risk bringing all the sediment up and immediately mixing it back into the biomass. In the worst case scenario, this could reduce gas production and block the pipe systems in the plant.

Correct start for a biogas plant

Start by identifying how much biomass (slurry + industrial waste) is added each day. Then add 20 g of Active NS per m3 of biomass added. As most biogas plants have a reception pit with capacity for one week’s use, it may be sufficient to add Active NS once a week; if this is not the case, however, add Active NS daily.

What to expect

After a very short agitation process, the biomass will mix better; mixing will become easier, and the biomass will become more homogenous; the amount of sediment in the reception pit will be reduced week by week. Once all the biomass in the tank has been treated with Active NS, gas production will start to increase.
It is reasonable to expect gas production to increase by approximately one extra month of gas per year.