Method and apparatus for adjusting the amount of play of different gases in a liquid

The invention relates to a method and an apparatus for adjusting the amount of play of a first and a second gas in a liquid, wherein the liquid is passed first along the first side of a gas permeable first membrane and then along the first side a gas-permeable second membrane, a first process gas is passed along the second side of the first membrane and a second process gas along said second side of the second diaphragm, and wherein the partial pressure of at least one of the two gases in the first process gas having a different value than in the second process gas, the flow rate of the first process gas a has another value than the flow rate of the second process gas, and / or the gas permeability of the first membrane has a different value than the gas permeability of the second membrane.