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Deep desulfurization method for high-sulfur-containing wastewater of oil and gas field

A technology for deep desulfurization, oil and gas fields, applied in mining wastewater treatment, chemical instruments and methods, water/sewage treatment, etc.

Inactive Publication Date: 2017-05-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among the three methods, the physical method is the simplest. The chemical method is not suitable for treating wastewater with high sulfur content due to the chemical reaction that occurs when the wastewater has a high sulfur content. Oxidation and removal of sulfide, due to the limitation of microbial tolerance, the efficiency of treating wastewater with high sulfur content is low, so it is not suitable for treating wastewater with high sulfur content
The patent also clearly defines that this patent is suitable for treating wastewater with a COD concentration of 2000-20000 mg / L and a sulfide content of 200-2000 mg / L

Method used

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  • Deep desulfurization method for high-sulfur-containing wastewater of oil and gas field
  • Deep desulfurization method for high-sulfur-containing wastewater of oil and gas field

Examples

Experimental program
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Effect test

Embodiment 1

[0078] The main water quality characteristics of high sulfur wastewater in oil and gas fields are: sulfide 2000mg / l, total dissolved solids 10000mg / l, suspended solids 500mg / l.

[0079] The treatment steps are as follows: First, the high-sulfur wastewater uses sulfuric acid to adjust the pH of the wastewater to 6 for the first time, and then enters the negative pressure desulfurization unit for desulfurization. MPa, the hydraulic retention time is 20min, and the reflux ratio of the circulating pump is 5:1; secondly, the negative pressure desulfurization effluent uses sulfuric acid to adjust the pH of the wastewater to 3 for the second time, and then enters the chemical catalytic oxidation unit for deep catalytic oxidation desulfurization, the oxidant is hydrogen peroxide , the dosage is 100mg / L, the catalyst is ferrous sulfate, and the dosage is 40mg / L; finally, sodium hydroxide is used to adjust the pH of the wastewater to 8 for the third time in the catalytic oxidative desulf...

Embodiment 2

[0083] The main water quality characteristics of high sulfur wastewater in oil and gas fields are: sulfide 5000mg / l, total dissolved solids 20000mg / l, suspended solids 1500mg / l.

[0084] The treatment steps are as follows: First, the high-sulfur wastewater uses hydrochloric acid to adjust the pH of the wastewater to 4.5 for the first time, and then enters the negative pressure desulfurization unit for desulfurization. MPa, the hydraulic retention time is 25min, and the reflux ratio of the circulating pump is 4:1; secondly, hydrochloric acid is used to adjust the pH of the wastewater to 3.3 for the second time in the negative pressure desulfurization effluent, and then enter the chemical catalytic oxidation unit for deep catalytic oxidation desulfurization, the oxidant is hydrogen peroxide , the dosage is 100mg / L, the catalyst is ferrous sulfate, and the dosage is 40mg / L; finally, sodium hydroxide is used to adjust the pH of the wastewater to 8.3 for the third time in the cataly...

Embodiment 3

[0088] The main water quality characteristics of high sulfur wastewater in oil and gas fields are: sulfide 10000mg / l, total dissolved solids 30000mg / l, suspended solids 3000mg / l.

[0089] The treatment steps are as follows: First, the high sulfur wastewater uses nitric acid to adjust the pH of the wastewater to 5 for the first time, and then enters the negative pressure desulfurization unit for desulfurization. The operating conditions of negative pressure desulfurization are: inlet water temperature 45°C, operating negative pressure -0.06 MPa, the hydraulic retention time is 30min, and the reflux ratio of the circulating pump is 3:1; secondly, the negative pressure desulfurization effluent uses nitric acid to adjust the pH of the wastewater to 3.5 for the second time, and then enters the chemical catalytic oxidation unit for deep catalytic oxidation desulfurization, the oxidant is hydrogen peroxide , the dosage is 200mg / L, the catalyst is ferrous sulfate, and the dosage is 80m...

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Abstract

The present invention relates to a deep desulfurization method of high-sulfur-containing wastewater of an oil and gas field, and the method comprises the following steps: according to the characteristic of a hydrogen sulfide presence form of sulfides in the high-sulfur-containing wastewater of the oil and gas field under acidic conditions, first, most of hydrogen sulfide in the wastewater is removed by a negative pressure desulfurization technology for centralized incineration; and secondly, residual hydrogen sulfide in negative pressure desulfurization unit effluent is oxidized by a chemical catalysis oxidation technology so as to finally realize the purpose of deep removal of the sulfides in the high-sulfur-containing wastewater of the oil and gas field, and the sulfur content of the effluent meets the reinjection water standard of the oil and gas field. The deep desulfurization method of the high-sulfur-containing wastewater of the oil and gas field can effectively remove the sulfides in the wastewater, solves the problem of too high sulfur content in the reinjection process of the high-sulfur-containing wastewater, and solves the disadvantages of huge equipment, complex process, low efficiency, poor environmental adaptability, high operation cost, difficulties in maintenance and the like in the prior art.

Description

technical field [0001] The invention relates to the field of industrial wastewater treatment, in particular to a deep desulfurization method for high-sulfur wastewater in oil and gas fields. In particular, it refers to a deep desulfurization method that uses negative pressure desulfurization + chemical catalytic oxidation technology to treat high-sulfur wastewater from oil and gas fields. Background technique [0002] With the development of social economy and the continuous improvement of people's living standards, the demand for energy is increasing day by day, and the extraction volume of oil and gas fields is increasing year by year. In the development of oil and gas fields, especially in the middle and late stages of gas field development, because formation water can invade gas reservoirs along faults and structural fractures, and enter the bottom of wells, the energy loss of gas reservoirs increases, wellhead pressure decreases, and water carrying capacity becomes poor...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/10
CPCC02F9/00C02F1/56C02F1/725C02F2103/10
Inventor 张新妙彭海珠万国晖
Owner CHINA PETROLEUM & CHEM CORP
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