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Treatment method for the treatment of high-sulfur wastewater from oil and gas fields by reducing injection and meeting standards

A treatment method and high-sulfur technology, which is applied in mining wastewater treatment, multi-stage water treatment, water/sewage treatment, etc., can solve the problems of reducing the amount of wastewater reinjection and excessive oil content, and achieve the reduction of wastewater reinjection, Solve the effect of huge equipment

Active Publication Date: 2020-02-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the defects existing in the prior art, the purpose of the present invention is to provide a treatment method for the treatment of high-sulfur wastewater from oil and gas fields, which uses negative pressure desulfurization + chemical reaction desulfurization + flocculation sedimentation + ceramic membrane filtration + high-pressure reverse osmosis + Ozone catalytic oxidation technology, oil and gas field high sulfur wastewater after treatment, can effectively remove sulfide, suspended solids, organic matter, chloride and oil in wastewater, and solve the sulfur content and suspended solids content in the process of oil and gas field high sulfur wastewater reinjection And the problem of high oil content, effectively reduce the amount of wastewater reinjection, and realize the standard discharge of high-sulfur wastewater from oil and gas fields

Method used

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  • Treatment method for the treatment of high-sulfur wastewater from oil and gas fields by reducing injection and meeting standards

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Experimental program
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Effect test

Embodiment 1

[0084] 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 100mg / L, total hardness (CaCO 3 Total) 1000mg / L, Na + 5000mg / L, Cl - 6000mg / L, SO 4 2- 1000mg / L, COD 800mg / L.

[0085] The processing steps are as follows:

[0086] 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;

[0087] In the second step, the negative pressure desulfurization effluent uses sulfuric acid to adjust the pH of the wastewater to 6.5 for the second time, and then enters the chemical reaction desu...

Embodiment 2

[0096]The main water quality characteristics of high-sulfur wastewater from oil and gas fields are: sulfide 5000mg / L, total dissolved solids 20000mg / L, suspended matter content 1500mg / L, oil content 150mg / L, total hardness (CaCO 3 Total) 1100mg / L, Na + 8000mg / L, Cl - 9000mg / L, SO 4 2- 1300mg / L, COD 1000mg / L.

[0097] The processing steps are as follows:

[0098] In the first step, the high-sulfur wastewater uses hydrochloric acid to adjust the pH of the wastewater to 4.8 for the first time, and then enters the negative pressure desulfurization unit for desulfurization. The operating conditions for negative pressure desulfurization are: inlet water temperature 40°C, operating negative pressure -0.05MPa, The wastewater residence time is 27min, and the reflux ratio of the circulating pump is 4:1;

[0099] In the second step, the pH of the negative pressure desulfurization water is 5.5, so there is no need to adjust the pH twice, and it directly enters the chemical reaction d...

Embodiment 3

[0108] The main water quality characteristics of high-sulfur wastewater from oil and gas fields are: sulfide 10000mg / L, total dissolved solids 30000mg / L, suspended matter content 3000mg / L, oil content 200mg / L, total hardness (CaCO 3 Total) 1200mg / L, Na + 10000mg / L, Cl - 11000mg / L, SO 4 2- 1400mg / L, COD 1200mg / L.

[0109] The processing steps are as follows:

[0110] 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;

[0111] In the second step, the pH of the negative pressure desulfurization water is 5.7, so there is no need to adjust the pH twice, and it directly enters the chemical reaction desulf...

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Abstract

The invention relates to a method for carrying out injection-reducing standard discharging treatment on high-sulfur wastewater of an oil-gas field. According to the method disclosed by the invention, technologies of negative-pressure desulfurization, chemical reaction desulfurization, flocculating settling, ceramic membrane filtering, high-pressure reverse osmosis and ozone catalytic oxidation are adopted, so that the purpose of deeply removing sulfide, suspended matters, organic matters, chloride and oil in the high-sulfur wastewater of oil-gas field can be realized, the sulfur content, the suspended matter content and the oil content in high-pressure reverse osmotic concentrated water can meet the reinjection water standard of the oil-gas field, and effluent after ozone catalytic oxidation is subjected to standard discharging.

Description

technical field [0001] The invention relates to the field of industrial waste water treatment, in particular to a method for treating high-sulfur waste water from oil and gas fields by reducing injection and meeting standards for discharge. Especially refers to the use of negative pressure desulfurization + chemical reaction desulfurization + flocculation sedimentation + ceramic membrane filtration + high-pressure reverse osmosis + ozone catalytic oxidation technology to treat high-sulfur wastewater from oil and gas fields by reducing injection and meeting standards. 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 al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/10
CPCC02F1/001C02F1/441C02F1/5245C02F1/56C02F1/78C02F9/00C02F2101/101C02F2103/10C02F2301/08
Inventor 张新妙郭智杨永强彭海珠
Owner CHINA PETROLEUM & CHEM CORP
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