Fremgangsmåte for fjerning av hydrogensulfid fra oljeholdig vann, og utstyr dertil

摘要

PCT No. PCT/NO93/00158 Sec. 371 Date Aug. 4, 1995 Sec. 102(e) Date Aug. 4, 1995 PCT Filed Oct. 27, 1993 PCT Pub. No. WO94/15878 PCT Pub. Date Jul. 21, 1994The invention relates to a method for removing hydrogen sulphide (H2S) from oil-containing water and equipment therefor. Oil-containing water and nitrate is conducted through a bioreactor to remove H2S. Nitrate is added to the oil-containing water in a dose ratio (sulphide:nitrate) of 1:10 to 1:40. The retention time in the reactor tank is 10-60 minutes. After this treatment, purified water where >90% of the H2S-amount is removed are taken out of the tank. The equipment for performing the method is based on a bioreactor having a large density of denitrifying bacteria. The reactor tank 1 is filled with carrying material providing large contact area. Even distribution of oil-containing water and nitrate over the carrying material which already may be covered by septic mud, forms an active sulphide oxidizing biofilm having a large surface. This biofilm is extremely effective for removing sulphide from oil-containing water.