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Drilling wastewater treatment system

A technology for treating system and drilling wastewater, which is applied in mining wastewater treatment, water/sewage treatment, heating water/sewage treatment, etc. It can solve the problems of difficult water quality, standard discharge, high treatment cost, etc., and achieve low oil content, complete separation, The effect of high deoiling efficiency

Pending Publication Date: 2021-09-21
南通固润环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Drilling wastewater is mainly a multi-phase stable suspension composed of clay, drilling cuttings, weighting materials, chemical additives, inorganic salts, and oil. Biological and chemical methods are more difficult to deal with
Drilling wastewater also has the characteristics of wide distribution area, many points and wide areas, and the number of each point is small, so centralized treatment is difficult and costly
The above characteristics determine that the drilling wastewater is very difficult to treat. Conventional treatment methods are difficult to make the water quality discharge up to the standard. At present, the main disposal method is to re-inject into the ground, but because the removal of harmful substances in the wastewater is not ideal, especially COD seriously exceeds the standard, it will be harmful groundwater pollution
[0003] Although the physical evaporation process is effective in treating oil drilling wastewater, it needs to consume a lot of heat or electricity, and the processing cost is very high. At present, the energy consumption of energy-saving mechanical compression evaporation process for treating one ton of drilling wastewater is also more than 50 kWh; In addition, drilling sites, especially oil fields and offshore oil fields in remote areas, may not be able to provide enough heat or electricity, which restricts the application of physical evaporation methods in drilling wastewater treatment
[0004] CN105540947A discloses a method and system for treating drilling wastewater. The method and system give full play to the characteristics of electrocoagulation to remove macromolecules, mechanical impurities and crude oil in drilling wastewater; Chloride ions are used to generate hypochlorous acid oxidant and degrade water-soluble small molecule organic matter together with other oxidants produced in the electrocatalytic oxidation process to achieve the characteristics of reducing COD and removing ammonia nitrogen, but this method cannot separate the oil components in wastewater well , the presence of oil components will increase the consumption during electrocatalytic oxidation
However, the process is complicated, the treatment effect is not thorough, and the oil and salt in the waste residue are high

Method used

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  • Drilling wastewater treatment system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] A drilling wastewater, COD: 1750mg / L, pH8.6, TP: 1.1mg / L, ammonia nitrogen 14.0mg / L, chloride ion content: 8450mg / L, suspended solids: 1648mg / L, oil content: 179mg / L;

[0045]The residence time in the internal circulation reactor is 20min, the effluent COD: 1140mg / L, pH7.5, TP: 0.9mg / L, ammonia nitrogen 0.6mg / L, chloride ion content: 7648mg / L, suspended solids: 145mg / L, oil content 31mg / L;

[0046] The effluent from the internal circulation reactor is transported to the settling tank for a residence time of 1.5h. The effluent of the settling tank has COD: 861mg / L, pH6.9, TP0.5mg / L, chloride ion content: 7348mg / L, and suspended solids: 11mg / L;

[0047] The effluent of the sedimentation tank enters the ultrafiltration device, and the ultrafiltration effluent COD: 164mg / L, pH7.1, TP: 0.2mg / L, ammonia nitrogen 0.1mg / L, chloride ion content: 11100mg / L; the ultrafiltration effluent enters the evaporation device for salinization evaporative crystallization treatment, and tran...

Embodiment 2

[0051] On the basis of Example 1, the oxidation tank was replaced by an electrocatalytic oxidation tank, and the chlorine ions in the ultrafiltered concentrated water were electrocatalyzed to form hypochlorite to oxidize and degrade the organic matter in the wastewater.

[0052] The electrocatalytic cell is equipped with mesh cathode and anode plates, and the anode is Ti / SnO 2 And iron plate, the cathode catalytic electrode is Ti metal electrode, the working current intensity is 10-30 amperes / ㎡ DC; the COD concentration of the effluent is reduced to 92.6mg / L, and the effluent of the electrocatalytic cell is returned to the ultrafiltration device.

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Abstract

The invention relates to a drilling wastewater treatment system which comprises an internal circulation reactor (1), a sedimentation tank (2), an ultrafiltration device (3), an oxidation tank (4) and a plate-and-frame filter (5). The circulating reactor (1) comprises a shell (11), an outer cylinder (12), an inner cylinder (13), a stirring device (14), an aeration head (15), a folded plate (16) and a conical bottom (17). The shell (11) is of a barrel-shaped structure, and the bottom of the barrel-shaped structure is connected with a cone bottom (17). A drain pipe is arranged at the middle upper part of the cone bottom (17) and / or the shell (11) and is communicated with the sedimentation tank (2), and a drain pipe is arranged at the middle upper part of the sedimentation tank (2) and is communicated with the ultrafiltration device (3). A concentrated drain pipe of the ultrafiltration device (3) is communicated with the oxidation pond (4), and the oxidation pond (4) is communicated with the plate-and-frame filter (5). And a stirring device (14) is arranged on a central shaft of the cylindrical structure. The drilling wastewater treatment system can improve the deoiling efficiency.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to a drilling wastewater treatment system. Background technique [0002] Drilling wastewater is mainly a multi-phase stable suspension composed of clay, drilling cuttings, weighting materials, chemical additives, inorganic salts, and oil. It is difficult to deal with biological and chemical methods. Drilling wastewater also has the characteristics of wide distribution area, many points and wide areas, and the number of each point is small, so centralized treatment is difficult and costly. The above characteristics determine that the drilling wastewater is very difficult to treat. Conventional treatment methods are difficult to make the water quality discharge up to the standard. At present, the main disposal method is to re-inject into the ground, but because the removal of harmful substances in the wastewater is not ideal, especially COD seriously exceeds the standa...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F103/10
CPCC02F9/00C02F1/02C02F1/24C02F1/36C02F1/40C02F1/001C02F1/444C02F1/441C02F1/722C02F1/725C02F1/4672C02F1/5236C02F2103/10C02F2303/14
Inventor 何力波周凯旋
Owner 南通固润环保科技有限公司
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