C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
C02F 3/00 (2006.01) C02F 1/72 (2006.01) C02F 3/10 (2006.01) C02F 3/28 (2006.01) C02F 3/34 (2006.01)
Patent
CA 2152797
The invention relates to a method for removing hydrogen sulphide (H2S) from oil-containing water and equipement 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 for 10-60 minutes. After this treatment, purified water where >90 % of the H2S-amount is removed are bt out of the tank. The equipment for performing the above mentioned method, is based on a bioreactor having 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 large surface. This biofilm makes an extremely effective equipment for removing sulphide from oil-containing water.
Eskilt Jan Petter
Hovland Jon
Hoyvik Henrik
Fetherstonhaugh & Co.
Norsk Hydro A.s.
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