But all remove systems should keep in mind that the hydrogen sulphur concentration of the manure should not be too high. The bacteria will only tolerate smaller amounts.
Often the supply of biogas into the natural gas system needs a compression. For example, using biogas for vehicles requires a compression to 22 bars.
The biogas output from the digester is warm and humid. In order to prevent corrosions, it should be dehumidified and cooled. One method is to fill the gas into a cool subterranean storage or dry it with compression cooling.
Removing CO2 is a current method for the reduction of ammoniac. It is executed through gas washing, pressure-washing or adsorption washing. Further methods include cryogen gas separations with low temperatures or separation with membranes.