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Injection-reduction and up-to-standard emission method for high-sulfur-content wastewater of oil and gas field

A high sulfur content, oil and gas field technology, applied in the direction of chemical instruments and methods, multi-stage water treatment, water/sewage treatment, etc., can solve the problem of reducing the amount of wastewater reinjection, so as to reduce the amount of wastewater reinjection and achieve standard discharge Effect

Active Publication Date: 2017-10-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects existing in the prior art, the purpose of the present invention is to provide a method for the discharge of high-sulfur wastewater from oil and gas fields, which uses negative pressure desulfurization + chemical catalytic oxidation + flocculation and sedimentation + organic membrane filtration + ozone catalytic oxidation + High-pressure reverse osmosis technology can effectively remove sulfide, suspended matter, organic matter, chloride and oil in wastewater, solve the problems of excessive sulfur content, suspended matter content and oil content in the process of reinjection of high-sulfur wastewater from oil and gas fields, and effectively reduce The amount of wastewater reinjection, to achieve the standard discharge of high-sulfur wastewater from oil and gas fields

Method used

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  • Injection-reduction and up-to-standard emission method for high-sulfur-content wastewater of oil and gas field

Examples

Experimental program
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Effect test

Embodiment 1

[0086] The main water quality characteristics of high sulfur wastewater from oil and gas fields are: sulfide 2000mg / L, total dissolved solids 10000mg / L, suspended solids 500mg / L, oil content 0mg / L, total hardness (CaCO 3 Total) 1000mg / L, Na + 5000mg / L, Cl - 6000mg / L, SO 4 2- 1000mg / L, COD 800mg / L.

[0087] The processing steps are as follows:

[0088] In the first step, 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. The operating conditions of negative pressure desulfurization are: inlet water temperature 35°C, operating negative pressure -0.04MPa, The wastewater residence time is 20 minutes, and the reflux ratio of the circulating pump is 5:1;

[0089] In the second step, 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...

Embodiment 2

[0098] The main water quality characteristics of high sulfur wastewater from oil and gas fields are: sulfide 5000mg / L, total dissolved solids 20000mg / L, suspended solids 1500mg / L, oil content 30mg / L, total hardness (CaCO 3 Total) 1100mg / L, Na + 8000mg / L, Cl - 9000mg / L, SO 4 2- 1300mg / L, COD 1000mg / L.

[0099] The processing steps are as follows:

[0100] In the first step, 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. The operating conditions of negative pressure desulfurization are: inlet water temperature 40°C, operating negative pressure -0.05MPa, The wastewater residence time is 25min, and the reflux ratio of the circulating pump is 4:1;

[0101] In the second step, the negative pressure desulfurization effluent uses hydrochloric acid to adjust the pH of the wastewater to 3.3 for the second time, and then enters the chemical...

Embodiment 3

[0110] The main water quality characteristics of high sulfur wastewater from oil and gas fields are: sulfide 10000mg / L, total dissolved solids 30000mg / L, suspended solids 3000mg / L, oil content 50mg / L, total hardness (CaCO 3 Total) 1200mg / L, Na + 10000mg / L, Cl - 11000mg / L, SO 4 2- 1400mg / L, COD 1200mg / L.

[0111] The processing steps are as follows:

[0112] In the first step, 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 -0.06MPa, The wastewater residence time is 30min, and the reflux ratio of the circulating pump is 3:1;

[0113] In the second step, 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 ...

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Abstract

The invention relates to an injection-reduction and up-to-standard emission method for high-sulfur-content wastewater of an oil and gas field. The method adopts a technology including negative-pressure desulfurization, chemical catalytic oxidation, flocculation settlement, organic membrane filtering, ozone catalytic oxidation and high-pressure reverse osmosis and can realize the aim of deeply removing sulfide, suspension matters, organic matters, chloride and oil in the high-sulfur-content wastewater of the oil and gas field; the sulfur content, suspension matter content and oil content of finally-obtained high-pressure reverse osmosis concentrated water meet reinjection water standards of the oil and gas field; the water produced by the high-pressure reverse osmosis meets up-to-standard emission standards.

Description

technical field [0001] The invention relates to the field of industrial waste water treatment, in particular to a method for reducing injection and meeting standards for high-sulfur waste water from oil and gas fields. In particular, it refers to the method of using negative pressure desulfurization + chemical catalytic oxidation + flocculation sedimentation + organic membrane filtration + ozone catalytic oxidation + high-pressure reverse osmosis technology to treat high-sulfur wastewater from oil and gas fields and meet the standard discharge method. 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 s...

Claims

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Application Information

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IPC IPC(8): C02F9/04
CPCC02F1/44C02F1/441C02F1/56C02F1/66C02F1/725C02F1/78C02F9/00C02F2301/08
Inventor 张新妙栾金义章晨林彭海珠
Owner CHINA PETROLEUM & CHEM CORP
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