Paques I.p.b.v.

Stora Enso Oyj

Erik Van Zessen

Hendrik Dijkman

Sjoerd Hubertus Jozef Vellinga

Sjoerd Hubertus Josef Vellinga

Antonius Johannes Jorna

René Alexander Rozendal

Ari Kotilainen

Jacco Huisman

Maria Björk

Olli Timonen

Petrus Cornelis Van Der Heijden

Jan Willem Albertus Bruins

Rickard Wadsborn

Michel Paulus Maria Noordink

A process for removing sulphide from an aqueous solution comprising sulphide is disclosed, in which the aqueous solution is subjected to sulphide-oxidizing bacteria in the presence of oxygen in a reactor to oxidize sulphide to elemental sulphur. According to the process, a molecular-oxygen containing gas is supplied to a reactor containing the sulphide-oxidizing bacteria in an aqueous medium, such that one or more aerated zones and one or more non-aerated zones are created in the aqueous medium with upward liquid flow in the aerated zones and downward liquid flow in the non-aerated zones; and a feed stream of the aqueous solution comprising sulphide is injected into the reactor in the one or more non-aerated zones, wherein the one or more aerated zone(s) are not separated from the one or more non-aerated zone(s) by means of vertically extending reactor internal.

Process for removing sulphide from an aqueous solution

Hydrogen sulfide can be removed from a liquid effluent of an anaerobic reactor, by subsequently: &#x2014;contacting the effluent liquid in counter current with a treated product gas of the anaerobic reactor to absorb hydrogen sulfide in the gas, &#x2014;collecting the desulfurized effluent liquid after said contacting, &#x2014;discharging at least part of the collected desulfurized effluent recirculation liquid as a treated effluent. To a remaining part of the desulfurized effluent waste water can be added and mixed, and the mixed water can be fed to the anaerobic reactor. Spent gas of the contacting step can be combined with sulfide-containing product gas of the anaerobic reactor and treated by desulfurization.

Hydrogen sulfide removal from anaerobic treatment

Alkaline solutions resulting from extracting sulfide from hydrocarbon fluids can be treated in a combination of one or more electrodialysis cells and a bioreactor. The electrodialysis cell () includes an anode (), a cathode (), an electric power supply () and a first () and a second () compartment separated from each other by an anion exchange membrane (). The alkaline solution is fed into the first compartment at the cathode side and the diluate (sulfide-depleted stream) leaving the first compartment has a lowered sulfide content and can be reused as the alkaline extractant solution. The concentrate (sulfide-enriched stream) leaving the second compartment is treated in the bioreactor () for removing sulfide and is then returned.

Process for removing sulfide from alkaline washing liquids

Growing community of inventors

Heerenveen, Netherlands

Erik Van Zessen