CN111410346B - Combined treatment device and method for waste drilling fluid - Google Patents
Combined treatment device and method for waste drilling fluid Download PDFInfo
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- CN111410346B CN111410346B CN202010108599.6A CN202010108599A CN111410346B CN 111410346 B CN111410346 B CN 111410346B CN 202010108599 A CN202010108599 A CN 202010108599A CN 111410346 B CN111410346 B CN 111410346B
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- 239000002699 waste material Substances 0.000 title claims abstract description 92
- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000001179 sorption measurement Methods 0.000 claims abstract description 73
- 230000001699 photocatalysis Effects 0.000 claims abstract description 24
- 238000007146 photocatalysis Methods 0.000 claims abstract description 11
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Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
- C02F1/002—Processes for the treatment of water whereby the filtration technique is of importance using small portable filters for producing potable water, e.g. personal travel or emergency equipment, survival kits, combat gear
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
- C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/32—Hydrocarbons, e.g. oil
- C02F2101/322—Volatile compounds, e.g. benzene
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Physical Water Treatments (AREA)
Abstract
The invention belongs to the technical field of drilling fluid treatment, discloses a combined treatment device and method for waste drilling fluid, and solves the problem that the existing waste drilling fluid is poor in separation effect of metal salt ions and micro solid phases. The device comprises an electric adsorption and photocatalysis combined treatment device, wherein the electric adsorption and photocatalysis combined treatment device comprises an electric adsorption box, the left side and the right side of the electric adsorption box are respectively provided with an electrode plate, the electrode plates are respectively communicated with an external power supply, two sides of the electrode plates are respectively sleeved with a clamping plate, the upper end of the electric adsorption box is provided with an ultraviolet lamp tube, and the ultraviolet lamp tube is communicated with the external power supply.
Description
Technical Field
The invention belongs to the technical field of drilling fluid treatment, and particularly relates to a waste drilling fluid combined treatment device and method.
Background
The drilling fluid is a circulating flushing medium used in holes in the drilling process, and has the main functions of: cooling the drill bit, cleaning the bottom of the hole and taking out rock debris. And lubricating the drilling tool. Suspending rock debris when the drilling is stopped, protecting the hole wall from collapse, balancing the formation pressure and pressing a high-pressure oil gas water layer. And fourthly, conveying the rock core to transmit power required by breaking the rock at the bottom of the hole to a hole bottom power machine. The waste drilling fluid mainly comprises drilling mud, drilling sewage, drill cuttings, fracturing operation flowback fluid and the like, generally has high COD (chemical oxygen demand) value and pH value, contains a large amount of organic components, inorganic salts, drilling fluid additives and the like in the mud and the fracturing fluid, has high pollutant concentration and has higher treatment difficulty.
In the prior art, the treatment of the waste drilling fluid is generally performed by centrifugal separation to separate solid matters in the drilling fluid, for example, the utility model patent of application No. 201320657605.9 discloses a device for recycling the waste oil-based drilling fluid, which mainly comprises a waste oil-based drilling fluid storage tank, a clear water storage tank, a valve, a heating and stirring tank, a demulsifier storage tank, a three-phase cyclone separator, a recovered oil storage tank, a sewage recovery tank, a waste silt solidification tank and a curing agent storage tank, wherein the waste oil-based drilling fluid storage tank, the clear water storage tank and the demulsifier storage tank are connected to the upper end of the heating and stirring tank through pipelines, the pipelines are provided with the bottom end of the valve heating and stirring tank connected to the top end of the three-phase cyclone separator, the recovered oil storage tank for recovering oil is connected to the middle part of the three-phase cyclone separator, the sewage recovery tank for containing sewage and the waste silt solidification tank are respectively connected to the lower end and the bottom end of the three-phase cyclone separator, the bottom end of the sewage recovery tank and the curing agent storage tank are respectively connected with the waste sediment curing tank.
The patent with the application number of 201610566660.5 discloses a solid-liquid separation method for waste water-based drilling fluid in oil and gas fields,
(1) area of Sinkiang
The waste water-based drilling fluid of the bentonite system in the first stage adopts a standing sedimentation method to naturally settle suspended solid-phase substances in the waste water-based drilling fluid to form sludge, and then realizes solid-liquid separation by a filtration method;
adding 1m3 waste water-based drilling fluid into flocculant PAC 14-15 kg to coagulate solid phase substances, and filtering out the solid phase substances by a filtering method to realize solid-liquid separation;
adding 14-15 kg of flocculant PAC (polyaluminium chloride) and 0.45-0.6 kg of coagulant aid PAM (polyacrylamide) into 1m3 waste water-based drilling fluid of a three-opening and four-opening stage polysulfonate system; the solid phase substances are condensed, and then the solid phase substances are filtered out by a filtering method to realize solid-liquid separation;
(2) chuandong region
The waste water-based drilling fluid of the bentonite system in the first stage adopts a standing sedimentation method to naturally settle solid-phase substances in the waste water-based drilling fluid to form sludge, and then a filtration method is used for realizing solid-liquid separation;
in the second-stage polymer system waste water-based drilling fluid, 1m3 waste water-based drilling fluid is added with flocculating agent PAC 18-20 kg, coagulant aid PAM 0.05-0.06 kg and stabilizing agent 2-2.5 kg to coagulate solid phase substances in the waste water-based drilling fluid, and then the solid phase substances are filtered out by a filtration method to realize solid-liquid separation;
30-35kg of compound gel breaker, 3-4 kg of flocculant PAC, 0.05-0.06 kg of coagulant aid PAM and 2-2.5 kg of stabilizer are added into the 1m3 waste water-based drilling fluid to break colloid ions, wherein liquid phase substances are released, solid phase substances are condensed, and solid phase substances are filtered out by a filtering method to realize solid-liquid separation;
(3) region of western Sichuan province
In the first-stage polymer system waste water-based drilling fluid, 10-11 kg of gel breaker, 10-5 kg of flocculant PAC 3-5 kg and 4-6 kg of stabilizer are added into 1m3 waste water-based drilling fluid to break colloid ions, wherein liquid-phase substances are released and solid-phase substances are condensed, and then solid-phase substances are filtered out by a filtering method to realize solid-liquid separation;
and secondly, adding 20kg of gel breaker, 20kg of flocculant PAC 3-4 kg and 10-12 kg of stabilizer into 1m3 waste water-based drilling fluid to crack colloid ions, releasing liquid phase substances in the gel, condensing solid phase substances, and filtering out the solid phase substances by using a filtering method to realize solid-liquid separation.
The flocculant PAC is polyaluminium chloride, the coagulant aid PAM is polyacrylamide, the stabilizer is calcium oxide, the gel breaker is aluminum sulfate, the compound gel breaker is a mixture of aluminum sulfate and sulfuric acid, and the proportion of the compound gel breaker is 30-35kg of aluminum sulfate and 0.02L of 2mol/L sulfuric acid.
The coagulant aid PAM is cationic polyacrylamide with molecular weight more than or equal to 600 ten thousand.
For another example, the invention patent with the application number of 201810283692.3 discloses a solid-liquid separation treatment method and application of waste drilling fluid, comprising three steps of ultrasonic treatment, waste drilling fluid centrifugation and solid-liquid phase separation, wherein the ultrasonic treatment is to convey the waste drilling fluid into a water tank of an ultrasonic treatment device, arrange ultrasonic treatment vibration plates into the water tank of the ultrasonic treatment device at equal intervals, and carry out ultrasonic treatment on the waste drilling fluid, the ultrasonic treatment time is 15 min-60 min respectively, and the ultrasonic treatment frequency is 18 kHz-25 kHz; the waste drilling fluid centrifugation is to introduce the waste drilling fluid after ultrasonic treatment into a centrifuge to centrifuge the waste drilling fluid after ultrasonic treatment, wherein the centrifugation time of the centrifuge is 10-60 min, and the centrifugation speed of the centrifuge is 2000-4000 r/min; the solid-liquid phase separation refers to the separation of the waste drilling fluid after the centrifugation of a centrifugal machine.
As the prior art teaches above, the treatment method for waste drilling fluid is mainly: solid-liquid separation is carried out by adopting a chemical treatment method and a centrifugal method.
However, the metal salt ions and the micro solid phases in the waste drilling fluid are difficult to separate in a centrifugal mode, so that the metal salt ions and the micro solid phases are poor in separation effect.
Disclosure of Invention
The invention provides a waste drilling fluid combined treatment device and method, aiming at solving the problem that the existing waste drilling fluid is poor in metal salt ion and micro solid phase separation effect.
In order to solve the technical problem, the technical scheme adopted by the invention is as follows:
the utility model provides an abandonment drilling fluid unites processing apparatus, its characterized in that, includes the combined processing apparatus of electro-adsorption photocatalysis, the combined processing apparatus of electro-adsorption photocatalysis includes the electro-adsorption case, the left and right sides of electro-adsorption case is provided with the plate electrode respectively, the plate electrode communicates with outside power respectively, the both sides of plate electrode are overlapped respectively and are equipped with splint, the upper end of electro-adsorption case is provided with the ultraviolet ray fluorescent tube, the ultraviolet ray fluorescent tube communicates with outside power.
Further, a first control box is arranged outside the electric adsorption box, a first power supply is arranged in the first control box, the first power supply is communicated with the electrode plate, and a first power supply controller for controlling the first power supply is arranged on the first control box; the outer part of the electric adsorption box is also provided with a second control box, a second power supply is arranged in the second control box and is communicated with the ultraviolet light lamp tube, and a second power supply controller used for controlling the second power supply is arranged on the second control box.
Furthermore, both sides of the electric adsorption box are respectively provided with a liquid discharge pipe and a liquid inlet pipeline, and the liquid inlet pipeline is communicated with a second circulating pump.
Furthermore, the feed end of the second circulating pump is provided with a filter tank, a filter screen is arranged in the filter tank, the feed end of the second circulating pump is communicated in the filter tank at the lower end of the filter screen, and the filter tank at the upper end of the filter screen is communicated with the waste drilling fluid through a pipeline and the first circulating pump.
The method for jointly treating the waste drilling fluid is characterized by comprising a waste drilling fluid joint treatment device, wherein the treatment of the waste drilling fluid joint treatment device on the waste drilling fluid comprises the following steps:
(1) pre-treating;
(2) filtering;
(3) electro-adsorption and photocatalytic treatment.
Further, the pretreatment comprises the steps of adding polyaluminium chloride into the waste drilling fluid, destabilizing charges and colloids in the waste drilling fluid by the polyaluminium chloride to form fine flocs, and stirring by using a stirrer; then adding polyacrylamide, stirring, standing, and taking supernatant.
Further, the adding amount of the polyaluminium chloride is 8-12g per L of the waste drilling fluid, and the adding amount of the polyacrylamide is 8-12g per L of the waste drilling fluid; adding polyaluminium chloride into the waste drilling fluid, and then stirring for 25-40min, and adding polyacrylamide into the waste drilling fluid, and then stirring for 5-6.5 h; adding polyacrylamide, stirring, and standing for 20-30 h.
Furthermore, the filtering is to filter out lumps and impurities in the supernatant by using a filter screen in the filter box.
Further, the electro-adsorption and photocatalytic treatment comprises:
(1) the voltage between two electrode plates in the electric adsorption box is 20-40v, and the distance between the two electrode plates is 0.8-5 cm; the voltage application time of the two electrode plates is 25-60 min;
(2) adding TIO into the supernatant entering the electric adsorption box2-graphene composite photocatalyst, said TIO2The adding amount of the graphene composite photocatalyst is 0.45-0.55mg added in each L of waste drilling fluid, the wavelength of ultraviolet light emitted by the ultraviolet light tube is 350-370nm, and the power of the ultraviolet light tube is 10-20 w.
Furthermore, the irradiation time of the ultraviolet lamp tube is 50-70 min.
Compared with the prior art, the invention has the following beneficial effects:
the waste drilling fluid combined treatment device provided by the invention is used for carrying out combined treatment on waste drilling fluid through electric adsorption and photocatalysis, in the treatment process, voltage is applied between two electrode plates to form an electric field for effectively adsorbing metal salt ions and micro solid phases in the waste drilling fluid, and the adsorbed metal salt ions (Na) are+，Mg2+，Al3+，Ca2+，K+,Hg2+，Pb2+，Cu2+) And the micro solid phase is adhered to the clamping plate, when the metal salt ions and the micro lone star on the clamping plate need to be removed, the clamping plate is taken down to be cleaned, or the clamping plate is sleeved again, so that continuous operation can be carried out; meanwhile, during electric adsorption, TIO is added into the waste drilling fluid2The graphene composite photocatalyst is irradiated by an ultraviolet lamp tube, and under the irradiation of ultraviolet light, TiO is coated on the graphene composite photocatalyst2Valence band electrons of the nano particles are excited to jump to a conduction band, photogenerated electrons are separated from holes, electron current is introduced into a graphene lamellar structure, the good conductivity of graphene inhibits the recombination probability of the holes and the electrons, and TiO is greatly improved2Photocatalytic activity of semiconductors. On the other hand, the graphene has larger surface area and rich pi-pi conjugated bonds on the surface, and can adsorb organic matters containing benzene rings on the surface to provide more photocatalysis sites, thereby improving metal salt ions and micro solid phasesAnd the adsorption capacity of organic matters. Through tests, the metal salt ion adsorption removal rate is 60-70%, and meanwhile, the content of solid phase particles in the waste drilling fluid can be reduced from 70% to 54.9-55.3%, so that the adsorption capacity of the solid phase particles in the waste drilling fluid is greatly improved; meanwhile, the particle size of solid-phase particles in the waste drilling fluid can be reduced.
Drawings
FIG. 1 is a schematic structural diagram of an embodiment of the combined treatment device for waste drilling fluid according to the present invention;
FIG. 2 is a schematic cross-sectional view of FIG. 1;
FIG. 3 is a table of particle size distributions of solid phase particles prior to treatment according to the present invention; the left curve in the graph represents the particle size point and the right curve represents the cumulative content of solid phase particles;
FIG. 4 is a table of particle size distributions of solid phase particles after treatment according to the invention; the left curve in the graph represents the particle size point and the right curve represents the cumulative content of solid phase particles;
the labels in the figure are: 1. the device comprises a filter box, 2, a frame body, 3, a filter screen, 4, a first flow guide pipe, 5, a first circulating pump, 6, a first case, 7, a liquid inlet pipe, 8, a second flow guide pipe, 9, a second circulating pump, 10, a second case, 11, a third flow guide pipe, 12, an electric adsorption case, 13, activated carbon fiber cloth, 14, an electrode plate, 15, a first control case, 16, a first power controller, 17, a first lead, 18, a liquid discharge pipe, 19, a liquid discharge valve, 20, a stand column, 21, a top plate, 22, a second lead, 23, a second control case, 24, a second power controller 25 and an ultraviolet light tube.
Detailed Description
The present invention will be further described with reference to the following examples, which are intended to illustrate only some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, other embodiments used by those skilled in the art without any creative effort belong to the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
With the aid of the attached drawings, the combined treatment device for the waste drilling fluid comprises an electric adsorption and photocatalysis combined treatment device, the electric adsorption and photocatalysis combined treatment device comprises an electric adsorption box 12, electrode plates 14 are respectively arranged on the left side and the right side of the electric adsorption box 12, the electrode plates 14 are respectively communicated with an external power supply, clamping plates 13 are respectively sleeved on the two sides of each electrode plate 14, an ultraviolet lamp tube 25 is arranged at the upper end of the electric adsorption box 12, and the ultraviolet lamp tubes 25 are communicated with the external power supply.
Further, a first control box 15 is arranged outside the electric adsorption box 12, a first power supply is arranged in the first control box 15, the first power supply is communicated with the electrode plate 14, and a first power supply controller 16 for controlling the first power supply is arranged on the first control box 15; the outside of electrosorption box 12 still is provided with second control box 23, be provided with the second power in the second control box 23, the second power communicates with ultraviolet ray fluorescent tube 25, be provided with second power controller 24 that is used for controlling the second power on the second control box 23.
Wherein the first control box 15 is used for mounting and fixing the first power supply and the first power supply controller 16, and the second control box 23 is used for mounting and fixing the second power supply and the second power supply controller 24. The first power controller and the second power controller are both products in the prior art, and can be understood and appreciated by those skilled in the art, and are not described herein again.
In some embodiments, the ultraviolet lamp tube 25 is connected to the second power controller 24 via the second conducting wire 22, and the electrode plate 14 is connected to the first power controller 16 via the first conducting wire 17.
For example, the power controller of the invention adopts the model BJW-51 produced by Tianjin Rongkesheng electrothermal material GmbH and the related matched power and circuit. The technical parameters of the power supply controller of the type are as follows: the voltage is 380v, and the controller temperature of BJW-51 is 0-200 ℃.
In some embodiments, eight identical clamping plates 13 are symmetrically and fixedly connected to two opposite inner walls of the electric adsorption box 12, each two clamping plates 13 form a group, and four groups of clamping plates 13 are respectively clamped on two sides of two motor plates 14, so as to fix the motor plates 14. The motor plates 14 on the left and right inner walls of the electric adsorption box 12 are symmetrically arranged according to the central axis of the electric adsorption box 12 in the vertical direction.
In some embodiments, the clamping plate 13 is made of activated carbon fiber cloth, and the clamping plate 13 made of activated carbon fiber cloth can not only clamp the electrode plate 14, but also facilitate the suspension of the adsorbed solid phase and heavy metal from the activated carbon fiber cloth after the electric adsorption of the electric adsorption tank 12 is completed.
In some embodiments, the upper portion of the electric adsorption box 12 is provided with the upright post 20, the upper end of the upright post 20 is provided with the top plate 21, and the ultraviolet light tube 25 is arranged on the top plate 21, so that the drilling fluid in the electric adsorption box 12 can be irradiated by the ultraviolet light emitted by the ultraviolet light tube 25.
Further, a liquid discharge pipe 18 and a liquid inlet pipeline are respectively arranged on two sides of the electro-adsorption tank 12, and the liquid inlet pipeline is communicated with a second circulating pump 9. Wherein, a drain valve 19 is arranged on the drain pipe 18, and the drain valve 19 is used for controlling the opening and closing of the drain pipe 18; the liquid inlet pipeline of the electric adsorption tank is used for being communicated with a third flow guide pipe 11, the third flow guide pipe 11 is communicated with a second circulating pump 9, namely the liquid inlet pipeline of the electric adsorption tank 12 is communicated with the second circulating pump 9 through the third flow guide pipe 11.
In some embodiments, the liquid inlet pipe of the electrosorption tank 12 may also be in direct communication with the second circulation pump 9.
Further, the feed end of second circulating pump 9 is provided with rose box 1, be provided with filter screen 3 in the rose box 1, the feed end intercommunication of second circulating pump 9 is in rose box 1 of filter screen 3 lower extreme, through pipeline and first circulating pump 5 and abandonment drilling fluid intercommunication in the rose box 1 of filter screen 3 upper end. That is to say, the feed end of second circulating pump 9 is used for communicating with the rose box below filter screen 3, and the discharge end of second circulating pump 9 is used for communicating with electrosorption case 12. As a preferable mode of the present invention, in order to improve the filtering effect of the filter screen 3, the mesh number of the filter screen 3 is 400 meshes (the aperture of the filter screen is about 38 micrometers), so that the filter screen can filter out solid phase particles of 1-2 micrometers, thereby reducing the workload of the subsequent electric adsorption tank 1. Wherein the filter screen 3 is convenient for filtering the lumps, industrial garbage and partial solid phase in the drilling fluid.
In some embodiments, the feeding end of the second circulation pump 9 is communicated with a second flow guide pipe 8, one end of the second flow guide pipe 8 is communicated with the feeding end of the second circulation pump 9, and the other end of the second flow guide pipe 8 is communicated with the filter box 1 below the filter screen 3.
In some embodiments, a frame 2 is mounted at the upper end of the filter box 1, and the filter screen 3 is mounted in the frame 2, and the frame is used for fixing the filter screen 3.
In some embodiments, a first guide pipe 4 is installed on the filter box at the upper end of the filter screen 3, the first guide pipe 4 is used for being communicated with a first circulating pump 5, and a liquid inlet pipe 7 used for extending into the waste drilling fluid is communicated with the feed end of the first circulating pump 5. In some embodiments, in order to protect the first circulation pump 5 and the second circulation pump 9 in the field and also facilitate installation and transportation, the first circulation pump 5 is installed in the first chassis 6 and the second circulation pump 9 is installed in the second chassis 10.
Wherein the first circulation pump 5 and the second circulation pump 9 are both prior art products, those skilled in the art can understand and understand that, for example, the first circulation pump 5 and the second circulation pump 9 are both of the ISG model manufactured by shanghaibede pumpsltd and their related power supply and circuit.
The circulation pump model of the ISG model is described as follows:
ISG50-160(I), A (B) 50-the diameter of the pump inlet and outlet is 50mm, the nominal external diameter of the impeller is 160mm, I-the flow classification, A-the external diameter cutting code of the impeller, and ISG-the single-stage single suction pipe centrifugal pump.
In order to correspond to the circulation pump of the model, the pipe diameters of the liquid inlet pipe 7 and the liquid outlet pipe 18 are 50mm, and meanwhile, the pipe diameters of the first draft tube 4, the second draft tube 8 and the third draft tube 11 are all 50 mm.
The waste drilling fluid combined treatment method provided by the invention comprises a waste drilling fluid combined treatment device, and the structure of the waste drilling fluid combined treatment device is described in the foregoing, and is not described in detail herein. The treatment of the waste drilling fluid by the waste drilling fluid combined treatment device comprises the following steps:
(1) pre-treating;
(2) filtering;
(3) electro-adsorption and photocatalytic treatment.
Further, the pretreatment comprises the steps of firstly adding polyaluminium chloride (PAC) into the waste drilling fluid, wherein the polyaluminium chloride destabilizes charges and colloids in the waste drilling fluid to form fine floccules, and stirring the floccules by using a stirrer; then adding Polyacrylamide (PAM), stirring, standing, and collecting supernatant.
Further, the adding amount of the polyaluminium chloride is 8-12g per L of the waste drilling fluid, and the adding amount of the polyacrylamide is 8-12g per L of the waste drilling fluid; adding polyaluminium chloride into the waste drilling fluid, and then stirring for 25-40min, and adding polyacrylamide into the waste drilling fluid, and then stirring for 5-6.5 h; adding polyacrylamide, stirring, and standing for 20-30 h.
Further, the filtering is to filter out lumps and impurities in the pretreated supernatant by using a filter screen in the filter box.
Further, the electro-adsorption and photocatalytic treatment comprises:
(1) the voltage between two electrode plates in the electric adsorption box is 20-40v, and the distance between the two electrode plates is 0.8-5 cm; the voltage application time of the two electrode plates is 25-60 min;
(2) adding TIO into the supernatant entering the electric adsorption box2-graphene composite photocatalyst, said TIO2The adding amount of the graphene composite photocatalyst is 0.45-0.55mg added in each L of waste drilling fluid, the wavelength of ultraviolet light emitted by the ultraviolet light tube is 350-370nm, and the power of the ultraviolet light tube is 10-20 w.
In some embodiments, the TIO2The addition amount of the graphene composite photocatalyst is 0.5mg added in each L of waste drilling fluid.
In some embodiments, the TIO2The adding time of the graphene composite photocatalyst can be directly added into the supernatant obtained after pretreatment in the step (1), or can be directly added into the previous adsorption step.
Further, the step (3) of electro-adsorption and photocatalytic treatment comprises: the photocatalytic treatment is carried out for a period of time, and then the photocatalytic treatment and the electro-adsorption are simultaneously carried out for a period of time.
Further, in the step (3), the voltage between the two electrode plates in the electric adsorption box is 30-36v, and the distance between the two electrode plates is 1-2.5 cm; the voltage is applied to the two electrode plates for 30-35 min. Under the condition, the method can ensure the best electro-adsorption effect and simultaneously ensure the activity of the photocatalyst to reach the highest value, thereby improving the adsorption capacity of metal salt ions and micro solid phases.
Furthermore, the photocatalyst treatment is carried out for 25-35min, then the photocatalyst treatment and the electric adsorption are carried out for 30-35min, the ultraviolet lamp tube is used for treating for 25-35min, and then the photocatalyst treatment and the electric adsorption are carried out simultaneously, so that the photocatalyst and the activity can reach the best, and the adsorption capacity of metal salt ions and micro solid phases is improved.
Furthermore, the irradiation time of the ultraviolet lamp tube is 50-70 min.
After the waste drilling fluid is pretreated, 50ml of supernatant fluid sample is taken, and an indoor test is carried out by utilizing a solid phase content tester, so that the solid phase content in the pretreated supernatant fluid can be measured to be 70%. The experimental data after the electro-adsorption and photocatalytic treatment are shown in the following table:
the table shows that the solid phase content of the drilling fluid can be greatly reduced after the electro-adsorption and photocatalysis treatment, and the solid phase particle content can be reduced from 70 percent to 54.9 to 55.3 percent.
The solid phase content of the invention is mainly that the solid phase particle adsorption capacity (namely micro solid phase and heavy metal salt ions) under corresponding conditions is calculated by a difference method, the percentage of the solid phase content is measured by a solid phase content measuring instrument before the experiment, after the experiment, the adsorption capacity (including the solid phase particles and the heavy metal salt ions) is represented on the activated carbon fiber cloth each time, the activated carbon fiber cloth is dried by an oven, and the removal amount of the solid phase particles, namely impurities, can be calculated by weighing and accumulating, thereby calculating the removal rate. Therefore, the clamping plate provided by the invention has the effect of clamping the electrode plate by adopting the activated carbon fiber cloth, and meanwhile, due to the characteristics of the activated carbon fiber cloth, the adhesion of solid-phase particles can be reduced as much as possible, so that the measurement accuracy is improved.
Before the device is processed, the particle size distribution of the pretreated waste drilling fluid is measured by a laser particle sizer, the measured particle size distribution is shown in figure 3, the left curve in the graph in figure 3 represents a particle size point, and the right curve represents the accumulated content of solid phase particles.
The particle size distribution after the treatment according to the invention is shown in FIG. 4, in which the left-hand curve in the graph of FIG. 4 represents the particle size points and the right-hand curve represents the cumulative content of solid particles.
The comparison between the attached drawings 3 and 4 can visually show that the particle size of the solid phase content in the waste drilling fluid can be reduced, so that the waste drilling fluid can be recycled by subsequent processing, and the problem that the waste drilling fluid cannot be processed and recycled again due to the fact that the particle size of the solid phase content in the existing waste drilling fluid does not reach the standard is solved.
In summary, the waste drilling fluid combined treatment device provided by the invention performs combined treatment on the waste drilling fluid through electric adsorption and photocatalysis, in the treatment process, a voltage is applied between two electrode plates to form an electric field for effectively adsorbing metal salt ions and micro solid phases in the waste drilling fluid, and the adsorbed metal salt ions (Na) are+，Mg2+，Al3+，Ca2+，K+,Hg2 +，Pb2+，Cu2+) And the micro solid phase is adhered to the clamping plate, when the metal salt ions and the micro lone star on the clamping plate need to be removed, the clamping plate is taken down to be cleaned, or the clamping plate is sleeved again, so that continuous operation can be carried out; meanwhile, during electric adsorption, TIO is added into the waste drilling fluid2The graphene composite photocatalyst is irradiated by an ultraviolet lamp tube, and under the irradiation of ultraviolet light, TiO is coated on the graphene composite photocatalyst2Valence band electrons of the nano particles are excited to jump to a conduction band, photogenerated electrons are separated from holes, electron current is introduced into a graphene lamellar structure, the good conductivity of graphene inhibits the recombination probability of the holes and the electrons, and TiO is greatly improved2Photocatalytic activity of semiconductors. On the other hand, the graphene has a large surface area, the surface of the graphene has rich pi-pi conjugated bonds, organic matters containing benzene rings can be adsorbed on the surface of the graphene, and more photocatalytic sites are provided, so that the adsorption capacity of metal salt ions, micro solid phases and the organic matters is improved.9-55.3 percent, thereby greatly improving the adsorption capacity to the solid phase particle content in the waste drilling fluid; meanwhile, the particle size of solid-phase particles in the waste drilling fluid can be reduced.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. Those skilled in the art can make various changes, modifications and equivalent arrangements, which are equivalent to the embodiments of the present invention, without departing from the spirit and scope of the present invention, and which may be made by utilizing the techniques disclosed above; meanwhile, any changes, modifications and variations of the above-described embodiments, which are equivalent to those of the technical spirit of the present invention, are within the scope of the technical solution of the present invention.
Claims (8)
1. The joint treatment method of the waste drilling fluid is characterized by comprising a joint treatment device of the waste drilling fluid, wherein the joint treatment device of the waste drilling fluid comprises an electric adsorption and photocatalysis joint treatment device which comprises an electric adsorption box, the left side and the right side of the electric adsorption box are respectively provided with a plate electrode, the plate electrodes are respectively communicated with an external power supply, the two sides of the plate electrode are respectively sleeved with a clamping plate, the upper end of the electric adsorption box is provided with an ultraviolet lamp tube, and the ultraviolet lamp tube is communicated with the external power supply;
the treatment of the waste drilling fluid by the waste drilling fluid combined treatment device comprises the following steps:
(1) pre-treating;
(2) filtering;
(3) electro-adsorption and photocatalytic treatment; the electro-adsorption and photocatalytic treatment comprises: firstly, carrying out photocatalytic treatment for a period of time, and then simultaneously carrying out photocatalytic treatment and electric adsorption for a period of time; the voltage between two electrode plates in the electric adsorption box is 20-40v, and the distance between the two electrode plates is 0.8-5 cm; two electrode plate applicationThe voltage time is 25-60 min; adding TIO into the supernatant entering the electric adsorption box2-graphene composite photocatalyst, said TIO2The adding amount of the graphene composite photocatalyst is 0.45-0.55mg added in each L of waste drilling fluid, the wavelength of ultraviolet light emitted by the ultraviolet light tube is 350-370nm, and the power of the ultraviolet light tube is 10-20 w.
2. The combined treatment method of the waste drilling fluid as claimed in claim 1, wherein the pretreatment comprises adding polyaluminium chloride to the waste drilling fluid, wherein the polyaluminium chloride destabilizes charges and colloids in the waste drilling fluid to form fine flocs and stirring the fine flocs by using a stirrer; then adding polyacrylamide, stirring, standing, and taking supernatant.
3. The joint treatment method of the waste drilling fluid as claimed in claim 2, wherein the adding amount of the polyaluminium chloride is 8-12g per L of the waste drilling fluid, and the adding amount of the polyacrylamide is 8-12g per L of the waste drilling fluid; adding polyaluminium chloride into the waste drilling fluid, and then stirring for 25-40min, and adding polyacrylamide into the waste drilling fluid, and then stirring for 5-6.5 h; adding polyacrylamide, stirring, and standing for 20-30 h.
4. The combined treatment method for the waste drilling fluid as claimed in claim 1, wherein the filtering is to remove lumps and impurities in the supernatant by using a filter screen in a filter box.
5. The combined treatment method for the waste drilling fluid as claimed in claim 1, wherein the irradiation time of the ultraviolet lamp tube is 50-70 min.
6. The joint treatment method of the waste drilling fluid as claimed in claim 1, wherein a first control box is arranged outside the electro-adsorption box, a first power supply is arranged in the first control box, the first power supply is communicated with the electrode plate, and a first power supply controller for controlling the first power supply is arranged on the first control box; the outer part of the electric adsorption box is also provided with a second control box, a second power supply is arranged in the second control box and is communicated with the ultraviolet light lamp tube, and a second power supply controller used for controlling the second power supply is arranged on the second control box.
7. The joint treatment method of the waste drilling fluid as claimed in claim 6, wherein a liquid discharge pipe and a liquid inlet pipeline are respectively arranged on two sides of the electro-adsorption tank, and the liquid inlet pipeline is communicated with a second circulating pump.
8. The combined treatment method for the waste drilling fluid as claimed in claim 7, wherein a filter box is arranged at the feed end of the second circulating pump, a filter screen is arranged in the filter box, the feed end of the second circulating pump is communicated in the filter box at the lower end of the filter screen, and the filter box at the upper end of the filter screen is communicated with the waste drilling fluid through a pipeline and the first circulating pump.
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