CN111825275A - High-sulfur-content wastewater treatment device based on supercritical water oxidation technology - Google Patents

High-sulfur-content wastewater treatment device based on supercritical water oxidation technology Download PDF

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Publication number
CN111825275A
CN111825275A CN202010652417.1A CN202010652417A CN111825275A CN 111825275 A CN111825275 A CN 111825275A CN 202010652417 A CN202010652417 A CN 202010652417A CN 111825275 A CN111825275 A CN 111825275A
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tank
supercritical water
water oxidation
pipe
sulfur
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余小兵
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Jieshou Lineng Environmental Protection Technology Development Co ltd
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Jieshou Lineng Environmental Protection Technology Development Co ltd
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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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
    • F22B1/00—Methods of steam generation characterised by form of heating method
    • F22B1/02—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers
    • F22B1/16—Methods of steam generation characterised by form of heating method by exploitation of the heat content of hot heat carriers the heat carrier being hot liquid or hot vapour, e.g. waste liquid, waste vapour
    • 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
    • C02F1/02—Treatment of water, waste water, or sewage by heating
    • C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
    • 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
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • 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
    • C02F2001/007—Processes including a sedimentation step
    • 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
    • C02F2101/101—Sulfur 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
    • C02F2101/40—Organic compounds containing sulfur
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used

Abstract

The invention discloses a high-sulfur-content wastewater treatment device based on a supercritical water oxidation technology, and relates to the technical field of wastewater treatment. The device comprises a pretreatment module, a supercritical water oxidation module, a waste heat recovery and utilization module and a biological desulfurization module; the supercritical water oxidation module comprises a second high-pressure pump, a supercritical water oxidation reaction tank and a pressure reducer; the waste heat recycling module comprises a gas-liquid separation tank, a waste heat boiler, a condensing device and a second absorption tank; the biological desulfurization module comprises an absorption tower, a bioreactor and a deposition tank. According to the invention, the high-sulfur-content wastewater treatment device which mainly adopts supercritical water oxidation technology for desulfurization and assists biological desulfurization is adopted to treat the high-sulfur-content wastewater, so that organic sulfide and inorganic sulfide in the wastewater are effectively treated; and through setting up exhaust-heat boiler, steam heat accumulator, carry out recycle to the unnecessary energy in the supercritical water oxidation retort, it is energy-concerving and environment-protective more.

Description

High-sulfur-content wastewater treatment device based on supercritical water oxidation technology
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a high-sulfur-content wastewater treatment device based on a supercritical water oxidation technology.
Background
In recent years, with the continuous development of economy and human society, basic industries such as dyes, medicines, pesticides and petrochemical industries are developed vigorously, a large amount of waste water is inevitably discharged, and the discharged waste water contains sulfides mainly comprising mercaptan, thiophenol, thioether, hydrogen sulfide and the like due to the industrial characteristics. The hydrogen sulfide has high toxicity and strong capability of killing aquatic organisms; under poor ventilation conditions, when they accumulate to a certain concentration, they can also have a toxic effect on the operators. In addition, after the wastewater containing sulfide is discharged into water, the wastewater can react with iron-based metals in the water to cause the water to smell and blacken, so that the state has strict discharge standards for the sulfur-containing wastewater.
Supercritical Water Oxidation (SCWO) technology is a technology capable of realizing deep Oxidation treatment of various organic wastes. Supercritical water oxidation is the complete oxidation of organic matter into clean H by oxidation2O、CO2And N2And S, P and the like are converted into the most valent salts for stabilization, and the heavy metal oxidation stabilization solid phase exists in the ash. The principle of the supercritical water oxidation technology is that supercritical water is used as a reaction medium, and organic matters are quickly converted into CO through a homogeneous oxidation reaction2、H2O、N2And other harmless small molecules, the treatment efficiency is high, and secondary pollution can not be formed. The existing supercritical water oxidation treatment device has the following problems:
1. the supercritical water oxidation technology can completely remove organic sulfides such as mercaptan, thiophenol and thioether in the high-sulfur wastewater, but the treatment effect of inorganic sulfides such as hydrogen sulfide in the high-sulfur wastewater is not good, and the sulfides in the high-sulfur wastewater cannot be completely removed.
2. When the content of organic matters in the wastewater exceeds 20 percent, the temperature required by the reaction can be maintained by means of self-oxidation heat release in the reaction process, no additional heat supply is needed, if the concentration is higher, more oxidation heat can be released, and the part of heat energy can be recovered. However, the existing supercritical water oxidation device does not recycle the redundant heat energy in the reaction process, which causes the waste of energy.
Biological desulfurization, also known as Biocatalytic Desulfurization (BDS), involves the use of microorganisms or enzymes contained therein to catalyze sulfurationCompound (H)2S, organic sulfur), and the accumulation of sulfur contained therein (conversion to S0 or elemental S). The sulfur component entering the microbial cells is decomposed and utilized as energy or nutrient for the life activities of the microbes, so that the pollutants are removed.
The existing devices need further improvement, so a high-sulfur wastewater treatment device based on supercritical water oxidation technology is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a high-sulfur-content wastewater treatment device based on a supercritical water oxidation technology, which solves the problems that the conventional supercritical water oxidation device cannot completely remove sulfur in high-sulfur-content wastewater and the conventional supercritical water oxidation device cannot recycle redundant heat energy in the reaction process, so that energy is wasted by arranging a pretreatment module, a supercritical water oxidation module, a waste heat recycling module and a biological desulfurization module.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a high-sulfur-content wastewater treatment device based on a supercritical water oxidation technology, which comprises a pretreatment module, a supercritical water oxidation module, a waste heat recovery and utilization module and a biological desulfurization module; the pretreatment module comprises a wastewater collection tank, a first high-pressure pump, a heating hydrolysis tank, a dosing tank, an oxidant booster pump and a first absorption tank; the top of the wastewater collection tank is connected with a collection pipe; a first water suction pipe of the first high-pressure pump is inserted into the wastewater collection tank; a first water delivery pipe of the first high-pressure pump is connected with the heating hydrolysis tank; the first absorption tank is connected with the heating hydrolysis tank through a first exhaust pipe; the batching tank is connected with the heating hydrolysis tank through a second water delivery pipe; the oxidant booster pump is connected with the batching tank through a first exhaust pipe; the bottom of the batching tank is provided with a stirring device; the supercritical water oxidation module comprises a second high-pressure pump, a supercritical water oxidation reaction tank and a pressure reducer; a second suction pipe of the second high-pressure pump is inserted into the batching tank; a third water delivery pipe of the second high-pressure pump is connected with the supercritical water oxidation reaction tank; the top surface of the supercritical water oxidation reaction tank is circular; a feeding pipe and a second exhaust pipe are arranged at the top of the supercritical water oxidation reaction tank; the upper part of the supercritical water oxidation reaction tank is also provided with an air inlet; a stirring and cleaning device is also arranged in the supercritical water oxidation reaction tank; the stirring and cleaning device is used for stirring and mixing the wastewater and the air uniformly and cleaning inorganic salt accumulated on the inner wall in the reaction process; a pressure reducer is also arranged at the bottom of the supercritical water oxidation reaction tank; the waste heat recycling module comprises a gas-liquid separation tank, a waste heat boiler, a condensing device and a second absorption tank; the gas-liquid separation tank is connected with the pressure reducer through a fourth water delivery pipe; the condensing device is connected with the top of the gas-liquid separation tank through a third exhaust pipe; the waste heat boiler is connected with the gas-liquid separation tank through a third high-pressure pump; the waste heat boiler comprises a boiler barrel and a flue; the boiler barrel is fixedly connected with the flue; the top of the boiler barrel is provided with a safety valve and an exhaust port; the exhaust port is connected with the condensing device through a fourth exhaust pipe; one end of the boiler barrel is provided with a water inlet; the other end of the boiler is provided with a water outlet; an air inlet is formed in one end of the flue; the other end of the flue is provided with an air outlet; the second absorption tank is connected with the air outlet of the flue through a fifth exhaust pipe; the biological desulfurization module comprises an absorption tower, a bioreactor and a deposition tank; the absorption tower is connected with the condensing device through a fifth water delivery pipe; the bioreactor is connected with the absorption tower through a sixth water conveying pipe; an aeration device is arranged at the bottom of the bioreactor; a feeding device is also arranged above the bioreactor; the aeration device is connected with the oxidant booster pump; a PH detection device is arranged on the bioreactor; vulcanized bacteria are put into the bioreactor; the sedimentation tank is connected with the bioreactor through a seventh water conveying pipe; the deposition tank is connected with the reactor through a fourth high-pressure pump; and the second water conveying pipe, the fourth water conveying pipe, the fifth water conveying pipe, the sixth water conveying pipe and the seventh water conveying pipe are all provided with control valves.
Furthermore, sodium hydroxide solution is filled in the first absorption tank and the second absorption tank.
Furthermore, the peripheral side surface of the supercritical water oxidation reaction tank is also provided with a temperature sensor and a pressure sensor.
Further, the temperature range in the supercritical water oxidation reaction tank is 374.3-500 ℃; the pressure intensity range in the supercritical water oxidation reaction tank is 22.064MPa-23 MPa.
Further, a steam heat accumulator is also arranged in the waste heat boiler.
Further, the sulfureted bacteria are Thiobacillus ferrooxidans, Thiobacillus denitrificans or Thiobacillus thioparus.
Further, the pH value in the bioreactor is controlled within the range of 2.0-3.5.
Further, the pH value in the bioreactor was 2.2.
The invention has the following beneficial effects:
1. the invention aims at the problem that the prior supercritical water oxidation device can not thoroughly remove the sulfur in the high-sulfur wastewater; a high-sulfur-content wastewater treatment device which mainly adopts supercritical water oxidation technology for desulfurization and assists biological desulfurization is adopted for treating high-sulfur-content wastewater; so that both organic sulfide and inorganic sulfide in the wastewater are effectively treated.
2. The invention aims at the problem that the existing supercritical water oxidation device does not recycle the redundant heat in the reaction process, thereby causing the waste of energy; the waste heat boiler and the steam heat accumulator are arranged, so that redundant energy in the supercritical water oxidation reaction tank is recycled, and the waste heat boiler and the steam heat accumulator are more energy-saving and environment-friendly.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a high-sulfur-content wastewater treatment device based on supercritical water oxidation technology.
In the drawings, the components represented by the respective reference numerals are listed below:
1-a wastewater collecting tank, 2-a first high-pressure pump, 3-a heating hydrolysis tank, 4-a dosing tank, 5-an oxidant booster pump, 6-a first absorption tank, 7-a second high-pressure pump, 8-a supercritical water oxidation reaction tank, 9-a pressure reducer, 10-a gas-liquid separation tank, 11-a waste heat boiler, 12-a condensing device, 13-a second absorption tank, 14-an absorption tower, 15-a bioreactor, 16-a deposition tank, 17-a collecting pipe, 18-a first water absorbing pipe, 19-a first water conveying pipe, 20-a control valve, 21-a feeding pipe, 22-a second air exhausting pipe, 23-an air inlet, 24-a stirring and cleaning device, 25-a pressure sensor, 26-a temperature sensor and 27-a boiler barrel, 28-safety valve, 29-exhaust port, 30-flue, 31-steam heat accumulator, 32-third high-pressure pump, 33-feeding device, 34-PH detection device, 35-aeration device, 36-fourth high-pressure pump and 37-stirring device.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "top," "upper," "inner," "one end," "the other end," and the like are used for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered as limiting the present invention.
Referring to fig. 1, the invention relates to a high-sulfur-content wastewater treatment device based on supercritical water oxidation technology, which comprises a pretreatment module, a supercritical water oxidation module, a waste heat recovery and utilization module and a biological desulfurization module; the pretreatment module comprises a wastewater collection tank 1, a first high-pressure pump 2, a heating hydrolysis tank 3, a dosing tank 4, an oxidant booster pump 5 and a first absorption tank 6; the top of the waste water collecting tank 1 is connected with a collecting pipe 17; the first water suction pipe 18 of the first high-pressure pump 2 is inserted into the wastewater collection tank 1; the first water delivery pipe 19 of the first high-pressure pump 2 is connected with the heating hydrolysis tank 3; the first absorption tank 6 is connected with the heating hydrolysis tank 3 through a first exhaust pipe; the proportioning tank 4 is connected with the heating hydrolysis tank 3 through a second water delivery pipe; the oxidant booster pump 5 is connected with the batching tank 4 through a first exhaust pipe; the bottom of the batching tank 4 is provided with a stirring device 37; the supercritical water oxidation module comprises a second high-pressure pump 7, a supercritical water oxidation reaction tank 8 and a pressure reducer 9; the second suction pipe of the second high-pressure pump 7 is inserted into the proportioning tank 4; a third water delivery pipe of the second high-pressure pump 7 is connected with a supercritical water oxidation reaction tank 8; the top surface of the supercritical water oxidation reaction tank 8 is round; the top of the supercritical water oxidation reaction tank 8 is provided with a feeding pipe 21 and a second exhaust pipe 22; the upper part of the supercritical water oxidation reaction tank 8 is also provided with an air inlet 23; a stirring and cleaning device 24 is also arranged in the supercritical water oxidation reaction tank 8; the stirring and cleaning device 24 is used for stirring and mixing the wastewater and the air uniformly and cleaning inorganic salt accumulated on the inner wall in the reaction process; the bottom of the supercritical water oxidation reaction tank 8 is also provided with a pressure reducer 9; the peripheral side surface of the supercritical water oxidation reaction tank 8 is also provided with a temperature sensor 26 and a pressure sensor 25; the temperature range in the supercritical water oxidation reaction tank 8 is 374.3-500 ℃; the pressure intensity range in the supercritical water oxidation reaction tank 8 is 22.064MPa-23 MPa; the waste heat recycling module comprises a gas-liquid separation tank 10, a waste heat boiler 11, a condensing device 12 and a second absorption tank 13; sodium hydroxide solution is filled in the first absorption tank 6 and the second absorption tank 13; the gas-liquid separation tank 10 is connected with the pressure reducer 9 through a fourth water delivery pipe; the condensing device 12 is connected with the top of the gas-liquid separation tank 10 through a third exhaust pipe; the waste heat boiler 11 is connected with the gas-liquid separation tank 10 through a third high-pressure pump 32; the waste heat boiler 11 comprises a boiler barrel 27 and a flue 30; the boiler barrel 27 is fixedly connected with the flue 30; the top of the boiler barrel 27 is provided with a safety valve 28 and an exhaust port 29; the exhaust port 29 is connected with the condensing device 12 through a fourth exhaust pipe; one end of the boiler barrel 27 is provided with a water inlet; the other end of the boiler is provided with a water outlet; one end of the flue 30 is provided with an air inlet; the other end of the flue 30 is provided with an air outlet; the second absorption tank 13 is connected with the air outlet of the flue 30 through a fifth exhaust pipe; a steam heat accumulator 31 is also arranged in the waste heat boiler 11; the biological desulfurization module comprises an absorption tower 14, a bioreactor 15 and a deposition tank 16; the absorption tower 14 is connected with the condensing device 12 through a fifth water conveying pipe; the bioreactor 15 is connected with the absorption tower 14 through a sixth water conveying pipe; the bottom of the bioreactor 15 is provided with an aeration device 35; a feeding device 33 is also arranged above the bioreactor 15; the aeration device 35 is connected with the oxidant booster pump 5; the bioreactor 15 is provided with a PH detection device 34; the pH value in the bioreactor 15 is controlled within the range of 2.0-3.5; the pH in bioreactor 15 was 2.2; sulfuration bacteria are put into the bioreactor 15; the sedimentation tank 16 is connected with the bioreactor 15 through a seventh water conveying pipe; the deposition tank 16 is connected with the reactor through a fourth high-pressure pump 36; the second water delivery pipe, the fourth water delivery pipe, the fifth water delivery pipe, the sixth water delivery pipe and the seventh water delivery pipe are all provided with control valves 20.
One specific application of this embodiment is:
conveying the high-sulfur-content wastewater into a wastewater collection tank 1 through a collection pipe 17, and starting treatment when the wastewater in the wastewater collection tank 1 is fully collected; firstly, opening a first high-pressure pump 2, pumping the wastewater into a heating hydrolysis tank 3, and heating to dissolve undissolved sulfides in the wastewater into water; hydrogen sulfide gas in the wastewater is discharged into the first absorption tank 6 through the first exhaust pipe to be absorbed;
opening a second water conveying pipe, and conveying the wastewater into the batching tank 4; opening an oxidant booster pump 5, and conveying oxidant into a dosing tank 4; the stirring device 37 at the bottom of the batching tank 4 fully mixes the wastewater with the oxidant;
conveying the wastewater into a supercritical water oxidation reaction tank 8 through a second high-pressure pump 7; by observing a pressure sensor 25 and a temperature sensor 26 on the supercritical water oxidation reaction tank 8; monitoring the temperature and pressure in the supercritical water oxidation reaction tank 8 in real time; most of organic sulfides in the wastewater are decomposed into sulfate through reaction treatment; a small part of inorganic sulfide is still not treated; the sulfur content in the wastewater is greatly reduced;
sulfate is accumulated on the inner wall of the supercritical water oxidation reaction tank 8 and is easy to block, so that the reaction efficiency is influenced, and at the moment, the inner wall of the supercritical water oxidation reaction tank 8 is cleaned by the stirring and cleaning device 24; after the reaction is finished, the wastewater is gradually changed into liquid from gas state through the pressure reducer 9;
opening a control valve 20 on the fourth water conveying pipe; the wastewater is conveyed into a gas-liquid separation tank 10; the water vapor and the hydrogen sulfide gas in the gas-liquid separation tank 10 are conveyed to a condensing pipe for condensation; the salt solution in the gas-liquid separation tank 10 is delivered to the drum 27 of the waste heat boiler 11 by the third high-pressure pump 32; the redundant heat in the supercritical water oxidation reaction tank 8 is conveyed into the flue 30 from the second exhaust pipe 22 in a gas conveying mode, the heat is collected under the action of the steam heat accumulator 31, the saline solution in the drum 27 is heated, the moisture in the saline solution is evaporated, and the salt is precipitated in a crystal form; the excess heat in the supercritical water oxidation reaction tank 8 is fully utilized; the water vapor is discharged into the condensing device 12 through the exhaust port 29; the water vapor and the hydrogen sulfide gas are changed into liquid through condensing the gas;
opening a control valve 20 on the fifth water conveying pipe; the wastewater enters an absorption tower 14, and the absorption liquid in the absorption tower 14 contains cell culture solution of Vibrio Sulforum and NaHCO3-Na2CO3Buffer pair, absorb H2S, obtaining a reaction solution; opening a control valve 20 on the sixth water conveying pipe; the reaction liquid enters a reactor; adding a hydrochloric acid solution into the bioreactor 15 through a feeding device 33, adjusting the pH value to 2.2, completely removing sulfur in the reaction liquid through the decomposition of the thiobacillus ferrooxidans in the bioreactor 15, and opening a control valve 20 on a seventh water conveying pipe; the wastewater is conveyed into a sedimentation tank 16, sulfur in the wastewater is precipitated in the form of elemental sulfur, and the wastewater in the sedimentation tank 16 is detectedThe sulfur content reaches the standard, and then the emission can be carried out.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (8)

1. A high-sulfur-content wastewater treatment device based on supercritical water oxidation technology comprises a pretreatment module, a supercritical water oxidation module, a waste heat recovery and utilization module and a biological desulfurization module;
the method is characterized in that:
the pretreatment module comprises a wastewater collection tank (1), a first high-pressure pump (2), a heating hydrolysis tank (3), a dosing tank (4), an oxidant booster pump (5) and a first absorption tank (6);
the top of the wastewater collection tank (1) is connected with a collection pipe (17); a first water suction pipe (18) of the first high-pressure pump (2) is inserted into the wastewater collection tank (1); a first water delivery pipe (19) of the first high-pressure pump (2) is connected with the heating hydrolysis tank (3); the first absorption tank (6) is connected with the heating hydrolysis tank (3) through a first exhaust pipe; the proportioning tank (4) is connected with the heating hydrolysis tank (3) through a second water delivery pipe; the oxidant booster pump (5) is connected with the batching tank (4) through a first exhaust pipe; a stirring device (37) is arranged at the bottom of the batching tank (4);
the supercritical water oxidation module comprises a second high-pressure pump (7), a supercritical water oxidation reaction tank (8) and a pressure reducer (9); a second suction pipe of the second high-pressure pump (7) is inserted into the proportioning tank (4); a third water delivery pipe of the second high-pressure pump (7) is connected with a supercritical water oxidation reaction tank (8); the top surface of the supercritical water oxidation reaction tank (8) is round; a feeding pipe (21) and a second exhaust pipe (22) are arranged at the top of the supercritical water oxidation reaction tank (8); the upper part of the supercritical water oxidation reaction tank (8) is also provided with an air inlet (23); a stirring and cleaning device (24) is also arranged in the supercritical water oxidation reaction tank (8); the stirring and cleaning device (24) is used for stirring and mixing the wastewater and the air uniformly and cleaning inorganic salt accumulated on the inner wall in the reaction process; a pressure reducer (9) is also arranged at the bottom of the supercritical water oxidation reaction tank (8);
the waste heat recycling module comprises a gas-liquid separation tank (10), a waste heat boiler (11), a condensing device (12) and a second absorption tank (13); the gas-liquid separation tank (10) is connected with the pressure reducer (9) through a fourth water delivery pipe; the condensing device (12) is connected with the top of the gas-liquid separation tank (10) through a third exhaust pipe; the waste heat boiler (11) is connected with the gas-liquid separation tank (10) through a third high-pressure pump (32); the waste heat boiler (11) comprises a boiler barrel (27) and a flue (30); the boiler barrel (27) is fixedly connected with the flue (30); the top of the boiler barrel (27) is provided with a safety valve (28) and an exhaust port (29); the exhaust port (29) is connected with the condensing device (12) through a fourth exhaust pipe; one end of the boiler barrel (27) is provided with a water inlet; the other end of the boiler is provided with a water outlet; one end of the flue (30) is provided with an air inlet; the other end of the flue (30) is provided with an air outlet; the second absorption tank (13) is connected with the air outlet of the flue (30) through a fifth exhaust pipe;
the biological desulfurization module comprises an absorption tower (14), a bioreactor (15) and a deposition tank (16); the absorption tower (14) is connected with the condensing device (12) through a fifth water conveying pipe; the bioreactor (15) is connected with the absorption tower (14) through a sixth water conveying pipe; an aeration device (35) is arranged at the bottom of the bioreactor (15); a feeding device (33) is also arranged above the bioreactor (15); the aeration device (35) is connected with an oxidant booster pump (5); a PH detection device (34) is arranged on the bioreactor (15); sulfuration bacteria are put into the bioreactor (15); the deposition tank (16) is connected with the bioreactor (15) through a seventh water conveying pipe; the deposition tank (16) is connected with the reactor through a fourth high-pressure pump (36); and the second water conveying pipe, the fourth water conveying pipe, the fifth water conveying pipe, the sixth water conveying pipe and the seventh water conveying pipe are all provided with control valves (20).
2. The supercritical water oxidation technology-based high sulfur-containing wastewater treatment device according to claim 1, wherein the first absorption tank (6) and the second absorption tank (13) are filled with sodium hydroxide solution.
3. The wastewater treatment device with high sulfur content based on supercritical water oxidation technology as claimed in claim 1 or 2, characterized in that the peripheral side of the supercritical water oxidation reaction tank (8) is further provided with a temperature sensor (26) and a pressure sensor (25).
4. The supercritical water oxidation technology-based high sulfur-containing wastewater treatment plant according to claim 3, wherein the temperature in the supercritical water oxidation reaction tank (8) is in the range of 374.3 ℃ to 500 ℃; the pressure intensity range in the supercritical water oxidation reaction tank (8) is 22.064MPa-23 MPa.
5. The device for treating the wastewater with high sulfur content based on the supercritical water oxidation technology as claimed in claim 1, 2 or 4, characterized in that a steam heat accumulator (31) is further arranged in the waste heat boiler (11).
6. The apparatus of claim 5, wherein the sulfur-bearing waste water is ferrous oxide thiobacillus, denitrogenation thiobacillus or sulfur-expelling bacillus.
7. The apparatus for treating wastewater with high sulfur content based on supercritical water oxidation technology as claimed in claim 1 or 2 or 4 or 6, wherein the pH value in the bioreactor (15) is controlled in the range of 2.0-3.5.
8. The supercritical water oxidation technology-based high sulfur-containing wastewater treatment plant according to claim 7, wherein the pH value in the bioreactor (15) is 2.2.
CN202010652417.1A 2020-07-08 2020-07-08 High-sulfur-content wastewater treatment device based on supercritical water oxidation technology Withdrawn CN111825275A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113897231A (en) * 2021-09-29 2022-01-07 中北大学 Method and device for oxidizing and desulfurizing coal in overheated near-critical water
CN114797725A (en) * 2022-04-29 2022-07-29 西安交通大学 Internal heating type supercritical water oxidation reactor

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113897231A (en) * 2021-09-29 2022-01-07 中北大学 Method and device for oxidizing and desulfurizing coal in overheated near-critical water
CN114797725A (en) * 2022-04-29 2022-07-29 西安交通大学 Internal heating type supercritical water oxidation reactor

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Application publication date: 20201027