Resourceful treatment method for wastewater with high sulfur content of oil and gas field

Abstract

The invention relates to a resourceful treatment method for wastewater with high sulfur content of the oil and gas field. The resourceful treatment method adopts negative-pressure desulfuration, chemical catalytic oxidation, flocculation settlement, organic membrane filtration, ozone catalytic oxidization, active carbon adsorption, novel electrodialyzer electrolyte separation and concentration andcrystallization to treat wastewater with high sulfur content of the oil and gas field. The resourceful treatment method realizes electrolyte separation and crystallization of salts in wastewater on the basis of effectively removing sulfides, suspended solids, organic substances and oil in wastewater, solves the difficult treatment problem of the wastewater with high sulfur content of the oil andgas field, and realizes recycling of the wastewater with high sulfur content of the oil and gas field on the basis of up-to-standard discharge.

Description

technical field

[0001] The invention relates to the field of industrial wastewater treatment, in particular to a resource treatment method for high-sulfur wastewater from oil and gas fields. Especially the use of negative pressure desulfurization + chemical catalytic oxidation + flocculation sedimentation + organic membrane filtration + ozone catalytic oxidation + activated carbon adsorption + new electrodialyzer separation and concentration + crystallization technology to treat high-sulfur wastewater from oil and gas fields, so that it can meet the discharge standards and realize resource utilization processing method. Background technique

[0002] With the increasing demand for energy, oil and gas field (oil and gas fields) extraction volume is increasing year by year. In the exploitation of oil and gas fields, especially in the middle and late stages of gas field exploitation, since formation water can invade the gas reservoir along faults and structural fissures, and en...

Examples

Embodiment 1

[0148] 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, COD800mg / L.

[0149] The processing steps are as follows:

[0150] In the first step, sulfuric acid is used to adjust the pH of the wastewater to 6 for the first time, and then enter 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 20min, and the reflux ratio of the circulating pump is 5:1;

[0151] In the second step, the effluent of the negative pressure desulfurization unit uses sulfuric acid to adjust the pH of the wastewater to 3 for the second time, and then enters the chemical catalytic oxidation unit fo...

Embodiment 2

[0167] 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, COD1000mg / L.

[0168] The processing steps are as follows:

[0169] In the first step, the high-sulfur wastewater from oil and gas fields 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 for 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;

[0170] In the second step, the effluent of the negative pressure desulfurization unit uses hydrochloric acid to adjust the pH of the wastewater to 3.3 for the seco...

Embodiment 3

[0186] 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, COD1200mg / L.

[0187] The processing steps are as follows:

[0188] In the first step, the high-sulfur wastewater from the oil and gas field 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 wastewater residence time is 30min, and the reflux ratio of the circulating pump is 3:1;

[0189] In the second step, the effluent of the negative pressure desulfurization unit 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, ...

technical field

[0001] The invention relates to the field of industrial wastewater treatment, in particular to a resource treatment method for high-sulfur wastewater from oil and gas fields. Especially the use of negative pressure desulfurization + chemical catalytic oxidation + flocculation sedimentation + organic membrane filtration + ozone catalytic oxidation + activated carbon adsorption + new electrodialyzer separation and concentration + crystallization technology to treat high-sulfur wastewater from oil and gas fields, so that it can meet the discharge standards and realize resource utilization processing method. Background technique

[0002] With the increasing demand for energy, oil and gas field (oil and gas fields) extraction volume is increasing year by year. In the exploitation of oil and gas fields, especially in the middle and late stages of gas field exploitation, since formation water can invade the gas reservoir along faults and structural fissures, and en...

Examples

Embodiment 1

[0148] 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, COD800mg / L.

[0149] The processing steps are as follows:

[0150] In the first step, sulfuric acid is used to adjust the pH of the wastewater to 6 for the first time, and then enter 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 20min, and the reflux ratio of the circulating pump is 5:1;

[0151] In the second step, the effluent of the negative pressure desulfurization unit uses sulfuric acid to adjust the pH of the wastewater to 3 for the second time, and then enters the chemical catalytic oxidation unit fo...

Embodiment 2

[0167] 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, COD1000mg / L.

[0168] The processing steps are as follows:

[0169] In the first step, the high-sulfur wastewater from oil and gas fields 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 for 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;

[0170] In the second step, the effluent of the negative pressure desulfurization unit uses hydrochloric acid to adjust the pH of the wastewater to 3.3 for the seco...

Embodiment 3

[0186] 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, COD1200mg / L.

[0187] The processing steps are as follows:

[0188] In the first step, the high-sulfur wastewater from the oil and gas field 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 wastewater residence time is 30min, and the reflux ratio of the circulating pump is 3:1;

[0189] In the second step, the effluent of the negative pressure desulfurization unit 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, ...

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