Method of removing hydrogen-sulfide from water

A method for removing hydrogen sulfide from a liquid stream comprising produced water from an underground oil or gas producing operation, the method comprising:

• contacting a first side of a porous, gas-liquid separation membrane with a liquid stream comprising a first amount of hydrogen sulfide;
• and
• contacting a second, opposite side of the separation membrane with a receiving fluid having a lower concentration of hydrogen sulfide than the liquid stream, wherein the hydrogen sulfide moves through the pores of the membrane from the first side to the second side, to provide a reduced-sulfide liquid stream having a second amount of hydrogen sulfide that is less than the first amount of hydrogen sulfide in the liquid stream, wherein the receiving fluid comprises water and an organic amine reactive with hydrogen sulfide.