Oil and gas field produced water heavy metal sludge conditioning and quantity reduction electro-catalytic oxidation reactor

Abstract

The utility model discloses an oil and gas field produced water heavy metal sludge conditioning reduction amount electrocatalytic oxidation reactor, including support, being equipped with reation kettle in the support, reation kettle lateral wall is equipped with feed inlet, is equipped with exhaust port at the top, is equipped with the sludge outlet at the bottom, is equipped with the stirrer in the reation kettle, and the lateral wall sets up electrode assembly. The utility model utilizes electrocatalytic oxidation technology to the oil and gas field produced water heavy metal sludge and carries out conditioning reduction amount and stabilization treatment.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection equipment technology, and in particular to an electrocatalytic oxidation reactor for conditioning and reducing the amount of heavy metal sludge in produced water from oil and gas fields. Background Technology

[0002] The sludge produced during the treatment of produced water from oil and gas fields contains heavy metals such as Cr, Pb, and Hg, as well as oily organic matter. Traditional treatment methods generally employ chemical stabilization and plate and frame filtration, but these methods suffer from problems such as low dewatering efficiency (sludge moisture content > 85%) and high risk of secondary heavy metal pollution. Summary of the Invention

[0003] This invention proposes an electrocatalytic oxidation reactor for conditioning and reducing the amount of heavy metal sludge in produced water from oil and gas fields. The reactor utilizes electrocatalytic oxidation technology to condition, reduce, and stabilize the heavy metal sludge in produced water from oil and gas fields.

[0004] The specific technical solution is as follows: An electrocatalytic oxidation reactor for conditioning and reducing the amount of heavy metal sludge in produced water from oil and gas fields, including a support frame, a reaction vessel inside the support frame, a feed inlet on the side wall of the reaction vessel, an exhaust port at the top, and a sludge discharge port at the bottom; a stirrer is installed inside the reaction vessel, and an electrode assembly is installed on the side wall.

[0005] The electrode assembly consists of a BDD anode and a titanium-based coated cathode.

[0006] The electrode assembly consists of four groups, which are evenly distributed in the middle of the side wall of the reactor.

[0007] An online conductivity monitor is installed at the top of the reactor.

[0008] A temperature detector is installed on the top of the reactor.

[0009] This invention utilizes an electrode assembly evenly distributed on the sidewall of a reactor, employing a combination of a BDD anode and a titanium-based cathode. Through high-potential electrolysis of water, it generates strong oxidizing substances such as hydroxyl radicals (OH) and O3, which oxidize heavy metal ions to a stable high valence state and decompose sludge organic colloids. Combined with a stirrer to create turbulence, it can improve mass transfer efficiency and efficiently utilize electrocatalytic oxidation technology to condition, reduce, and stabilize heavy metal sludge in oil and gas field produced water. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the structure of this utility model. Detailed Implementation

[0011] like Figure 1As shown, an electrocatalytic oxidation reactor for conditioning and reducing the amount of heavy metal sludge in produced water from oil and gas fields includes a support frame 1, a reaction vessel 2 inside the support frame 1, a feed inlet 3 on the side wall of the reaction vessel 2, an exhaust port 4 at the top, and a sludge discharge port 5 at the bottom; a stirrer 6 inside the reaction vessel, four sets of electrode assemblies 7 evenly arranged in the middle of the side wall, and an online conductivity monitoring instrument 8 and a temperature detector 9 at the top.

[0012] Electrode assembly 7 is made of surface boron doped with a concentration of 1×10⁻⁶. 20 ~5×10 21 The electrode consists of a BDD anode 11 with an atom / cm³ capacity and a titanium-based coated cathode 12, with an electrode spacing of 5-10 mm; the electrode power supply current density is 10-50 mA / cm², and the pulse frequency is 100-1000 Hz.

[0013] Cr-containing material with a moisture content of 98% 3+ (Concentration 50 mg / L), Pb 2+ (Concentration 40 mg / L), Hg 2+ Heavy metal sludge from oil and gas field produced water (concentration 10 mg / L) was pumped into the reactor. The electrode assembly was started, the current density was set to 30 mA / cm², and the stirrer speed was 60 rpm. After 60 minutes of reaction, the sludge specific resistance decreased from 1.2 × 10⁻⁶. 12 m / kg decreased to 6.0×10 10 m / kg, after dehydration the water content is 65%; Cr in the leachate 6+ Concentration <1.0 mg / L, Pb 2+ Concentration < 5.0 mg / L, Hg 2+ <0.05mg / L, meeting landfill standards.

[0014] Comparative experiment: Heavy metal sludge from the same oil and gas field produced water, without electrocatalytic reaction, had a water content of 82% after direct dehydration, and a specific resistance of 1.1 × 10⁻⁶. 12 m / kg, Cr leaching concentration >10 mg / L, Pb 2+ Concentration > 9 mg / L, Hg 2+ >2mg / L.

[0015] This invention utilizes an electrode assembly evenly distributed on the sidewall of a reactor, employing a combination of a BDD anode and a titanium-based cathode. Through high-potential electrolysis of water, it generates ·OH and O3, oxidizing heavy metal ions to a stable high valence state and decomposing organic colloids in the sludge. Combined with a stirrer to create turbulence, it can improve mass transfer efficiency and efficiently utilize electrocatalytic oxidation technology to condition, reduce, and stabilize heavy metal sludge in oil and gas field produced water.

[0016] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An electrocatalytic oxidation reactor for conditioning and reducing the volume of heavy metal sludge in produced water from oil and gas fields, characterized in that, Includes a support frame, with a reactor inside the support frame, a feed inlet on the side wall of the reactor, an exhaust port at the top, and a sludge discharge port at the bottom; The reactor is equipped with a stirrer inside and electrode assemblies on the side walls.

2. The electrocatalytic oxidation reactor for conditioning and reducing the amount of heavy metal sludge in produced water from oil and gas fields according to claim 1, characterized in that, The electrode assembly consists of a BDD anode and a titanium-based coated cathode.

3. The electrocatalytic oxidation reactor for conditioning and reducing the amount of heavy metal sludge in oil and gas field produced water according to claim 1, characterized in that, The electrode assembly consists of four groups, which are evenly distributed in the middle of the side wall of the reactor.

4. The electrocatalytic oxidation reactor for conditioning and reducing the amount of heavy metal sludge in oil and gas field produced water according to claim 1, characterized in that, An online conductivity monitor is installed at the top of the reactor.

5. The electrocatalytic oxidation reactor for conditioning and reducing the amount of heavy metal sludge in produced water from oil and gas fields according to claim 1, characterized in that, A temperature detector is installed on the top of the reactor.

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