Abstract: Method for removal of oxygen from seawater includes leading a stream of seawater and a pressurized stripping gas to a first mixer, mixing the seawater with stripping gas, leading the combined stream to a first gas/liquid inline separator, separating the stream into a liquid rich and a gas rich phase, leading the liquid stream and a stripping gas stream to a second mixer, mixing the liquid stream with the gas stream, leading the combined stream to a second stage inline separator, separating the combined stream into a liquid- and gas-rich phases, mixing the gas stream with a fresh water stream, leading this combined stream to a first stage scrubber, removing a portion of the salt entrained in the combined stream from the scrubber, and leading the salt depleted gas stream from the first scrubber via a heat exchanger or electrical preheater together with a fuel stream to a catalytic deoxidizer.

Abstract: Present invention relates to a method for removal of oxygen from seawater comprising the following steps: lead a stream of seawater (1) to be treated and a pressurized stripping gas (2) to a first mixer (3) and mix the seawater (1) with stripping gas (2); lead the combined stream (4) of seawater (1) and stripping gas (2) to a first gas/liquid inline separator (5) and separate the stream (4) into a liquid rich (6) and a gas rich (1 1) phase; lead the liquid stream (6) and a stripping gas stream (7) containing CO2 and water to a second mixer (8) and mix the liquid stream (6) with the gas stream (7); lead the combined stream (9) from the second mixer (8) to a second stage gas/liquid inline separator (10) and separate the combined stream into a liquid rich (14) and a gas rich phase (15); mix the gas stream (1 1) from the first gas/liquid separator (5) with a fresh water stream (22) and lead this combined stream to a first stage scrubber (12) and remove a major portion of the salt entrained in the combined stream

Abstract: A method and a system for removing dispersed and dissolved hydrocarbons from produced water in connection with the extraction of oil and gas from geological formations beneath the sea bed or the ground. The produced water first undergoes mechanical or electromechanical treatment in a sub-process “A” to remove the dispersed hydrocarbons from the water and is subsequently treated in a sub-process “B” by stripping with a circulating inert gas in one or more stages (1, 2) to remove the dissolved hydrocarbons. The inert gas consists expediently of N2 containing 02 and the subsequent removal of the hydrocarbons is carried out in a catalytic converter (5) by catalytic combustion of the stripped hydrocarbons.