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A treatment method for oil and gas field wastewater

A treatment method and oil and gas field technology, applied in the direction of mining wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of increasing solid-liquid separation load, affecting resource utilization, and high processing costs, and achieve resource improvement. The effect of high utilization rate, easy automatic control, and low solid phase moisture content

Inactive Publication Date: 2020-01-17
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment has the following disadvantages: a large amount of process chemical treatment agent is added, and high-priced metal ions are introduced, causing secondary pollution and affecting resource utilization; the treatment process is complicated, the amount of flocs after treatment is large, and the load of solid-liquid separation is increased; .The treatment cost is high; the treatment is difficult to reach the standard;

Method used

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  • A treatment method for oil and gas field wastewater
  • A treatment method for oil and gas field wastewater
  • A treatment method for oil and gas field wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Comparison of treatment effect between electrocatalytic oxidation and conventional treatment technology

[0041] Experimental conditions for the control group: Take 500mL of drilling wastewater, add gel-breaking coagulant PAC (polyaluminum chloride) 6000mg / L, stir and coagulate for 15min, use sodium hydroxide to adjust the pH to 9-10, add PAM (polyacrylamide) 30mg / L, using a pulse power supply to stir slowly for 2-3 minutes, and then centrifuged to separate the aqueous phase COD, pH, SS, chroma, oil content, floc moisture content, floc moisture content, and dry floc weight.

[0042] Experimental conditions of the present invention: Take 500mL of drilling wastewater, control the electrocatalytic oxidation time for 30 minutes, add surface organically modified permanent magnet powder as a magnetic flocculant, the dosage is 6g / L drilling wastewater, stir flocculation and sedimentation for 10 minutes, and use a disk for solid-liquid separation , after the separation, the mag...

Embodiment 2

[0046] Comparative Study of Electrode Plates

[0047] Take 500mL of drilling wastewater, use aluminum electrode, iron electrode, and titanium-plated electrode as anode respectively, use graphite as cathode, use pulse power supply, control the electrocatalytic oxidation time for 30min, and use powdered titanium dioxide (particle size: 200 mesh) as the catalyst, and the amount of titanium dioxide used is 10wt% of the waste water, adding surface organically modified permanent magnet powder as a magnetic flocculant, the dosage is 6g / L drilling wastewater, stirring flocculation and sedimentation for 10min, using a disk for solid-liquid separation, and the separated solid phase is oscillated to recover the magnetic flocculant , fine filtration of the water phase after separation, test and analysis of COD after fine filtration cr, pH, SS, chroma, oil content, floc water content, floc sedimentation velocity and filtration speed, the results are shown in Table 2.

[0048] Table 2 Effe...

Embodiment 3

[0052] Effect of power supply type on processing effect

[0053] Aluminum electrodes and titanium-plated electrodes are used as anodes, and graphite is used as cathodes. DC power supply and pulse power supply are used to treat drilling wastewater respectively. The catalyst uses powdered titanium dioxide (particle size: 200 mesh), and the amount of titanium dioxide used is 10wt% of the wastewater. Keep the same conditions, add surface organically modified permanent magnet powder as a magnetic flocculant, the dosage is 6g / L drilling wastewater, stir and flocculate for 10 minutes, use a disk for solid-liquid separation, the separated solid phase oscillates to recover the magnetic flocculant, separate After fine filtration of the water phase, test and analyze COD after fine filtration cr , pH, SS, chroma, oil content, the results are shown in Table 3.

[0054] Table 3 Effects of different plates and different power types on drilling wastewater treatment

[0055]

[0056] It c...

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Abstract

The invention discloses a treatment method for wastewater of oil and gas fields. The treatment method comprises the following steps: carrying out electrocatalytic oxidation treatment on wastewater under the pulsed power supply condition, then adding a magnetic flocculant for carrying out flocculation precipitation reaction, and carrying out magnetic separation and solid-liquid separation, so as to obtain treated oil and gas field wastewater. The treatment method disclosed by the invention has good treatment effect on the wastewater of the oil and gas fields, recycling utilization rate of the treated wastewater is high, the technology is simple and automated control can be easily realized.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a treatment method for oil and gas field wastewater Background technique [0002] With the intensification of oil and gas exploration, the number of production and transportation wells is gradually increasing, and the amount of waste water is also increasing year by year. Oil and gas field waste water includes harmful components that cause environmental pollution, such as oil, salt, fungicides, certain Chemical additives, heavy metals (such as mercury, copper, chromium, cadmium, zinc, lead, etc.), low-molecular organic compounds and alkaline substances produced by the biodegradation of high-molecular organic compounds, causing chromaticity, COD, SS, petroleum, etc. A large number of pollution indicators exceed the standard and are highly contagious. If they are discharged directly without treatment, they will seriously damage the ecological environment and affect the sustainab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/12C02F103/10
CPCC02F1/4672C02F1/481C02F1/5236C02F1/725C02F9/00C02F2001/46133C02F2103/10
Inventor 张太亮
Owner SOUTHWEST PETROLEUM UNIV
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