A treatment method for high-sulfur wastewater from oil and gas fields

Abstract

The invention discloses a method for treating high-sulfur-content sewage of oil and gas fields. The method comprises the following steps: (1) adjusting the pH value of the sewage to 7-8, adding a 1mol / L oxidant solution, stirring to react for 10-15 minutes; and filtering; and (2) adding a 30mg / L-50mg / L imidazoline corrosion inhibitor and 30mg / L-40mg / L tetrahydroxymethyl phosphorus sulfate into the treated sewage, and uniformly stirring. The adopted oxidant solution is a sodium sulfite solution, or a sodium hydrogen sulfite solution or a mixed solution of sodium sulfite and sodium hydrogen sulfite. The method for treating the sulfur-containing sewage has the beneficial effects that the operation is simple, the cost is low, sulfur can be removed by only adding an oxidant, the sulfur removal rate is more than 98%, the generation of a byproduct, namely sulfate ions is avoided, and secondary corrosion of equipment is avoided; and furthermore, the corrosivity of water after sulfur is removed is obviously reduced, and the corrosion inhibitor and a sterilizing agent are added, so that the corrosivity of water is further reduced, and the corrosion of water can be remarkably reduced.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a treatment method for high-sulfur sewage in oil and gas fields. Background technique [0002] In the late stage of oil and gas field development, oil and gas fields containing hydrogen sulfide corrosive media appeared one after another, and the corrosion problem has attracted more and more attention. Corrosion not only causes huge economic losses to the development and production of oil fields, but also causes environmental pollution and threatens the safety of workers. At present, there are many domestic methods for removing sulfide from oilfield high-sulfur sewage, such as air stripping, oxidation (air oxidation, chemical oxidation, ozone method and photocatalytic oxidation method, aerobic biological oxidation and anaerobic biological oxidation), neutralization method , Hollow extraction method, chemical precipitation method, electrochemical desulfurization method....

AI Technical Summary

Problems solved by technology

According to the analysis of the electrode potential, these oxidants can oxidize divalent sulfur to elemental sulfur and at the same time, they can also be oxidized to sulfate. The increase of the by-product sulfate will cause secondary corrosion to the equipment

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