CN214612061U

CN214612061U - System for coal chemical industry waste salt resource utilization

Info

Publication number: CN214612061U
Application number: CN202120417606.0U
Authority: CN
Inventors: 俞德仁; 柏明锁; 李元友; 于莹莹
Original assignee: Beijing Zhonglixinda Environmental Technology Co ltd
Current assignee: Beijing Zhonglixinda Environmental Technology Co ltd
Priority date: 2021-02-25
Filing date: 2021-02-25
Publication date: 2021-11-05
Anticipated expiration: 2031-02-25

Abstract

A system for recycling coal chemical industry waste salt belongs to the technical field of sewage treatment. Including washing jar, molecular sieve, NF nanofiltration integrated equipment, RO integrated equipment, CWAO catalysis wet oxidation unit, coagulating sedimentation device and biochemical treatment device, washing jar and molecular sieve intercommunication, the permeate liquid conveyer pipe and the NF nanofiltration integrated equipment intercommunication of molecular sieve, concentrate conveyer pipe and CWAO catalysis wet oxidation unit intercommunication, the NF nanofiltration integrated equipment permeate liquid conveyer pipe and RO integrated equipment intercommunication, the NF nanofiltration integrated equipment concentrate conveyer pipe and coagulating sedimentation device intercommunication, the play liquid end of CWAO catalysis wet oxidation unit and coagulating sedimentation device's precipitation device's play liquid end and biochemical treatment device be linked together, the permeate liquid conveyer pipe and biochemical treatment device of RO integrated equipment be linked together. The advantages are that: the grading treatment and the gradient utilization of the wastewater are realized, and the ecological environment protection is embodied.

Description

System for coal chemical industry waste salt resource utilization

Technical Field

The utility model belongs to the technical field of sewage treatment, concretely relates to system of coal chemical industry waste salt utilization as a resource.

Background

Coal chemical industry refers to the process of converting coal into gas, liquid and solid fuels or chemicals by chemical processing using coal as a raw material. As the coal chemical industry belongs to the industries with high water consumption and high pollution, the national environmental protection department puts forward strict zero emission requirements on the treatment of wastewater in the coal chemical industry. Although a large amount of inorganic waste salt can be produced in the zero discharge process of the coal chemical industry wastewater by utilizing the traditional evaporation concentration process and device, the inorganic waste salt contains a small amount of inorganic impurities and toxic and harmful substances besides a large amount of NaCl, can not be directly used as industrial raw material salt and can not be used for food or medical use, the economic value is low, and no market is sold, so that the operation cost of enterprises for treating the coal chemical industry wastewater is overhigh and difficult to bear, and therefore, most of manufacturers stack the waste salt. The book of national hazardous wastes passed through in 2016 clearly lists waste salt generated in the coal chemical industry production process, and at present, the current situation has attracted high attention of relevant people at home and abroad, and it is also a difficult point that how to effectively treat the coal chemical industry wastewater to ensure that the water can be purified and regenerated, so that the sodium salt contained in the wastewater can be recycled, and the important point of the research on the coal chemical industry wastewater and sewage treatment is realized.

In view of the above-mentioned prior art, the applicant has made active and advantageous designs, and the technical solutions to be described below have been made in this context.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a high-efficient, reliable, economic and safe coal chemical industry waste salt resource utilization's system.

The utility model aims at achieving the purpose, a system for recycling waste salt in coal chemical industry is characterized in that the system comprises a water washing tank, a molecular sieve, a NF nanofiltration integrated device, a RO integrated device, a CWAO catalytic wet oxidation device, a coagulating sedimentation device and a biochemical treatment device, wherein a stirring machine is arranged in the middle of the top of the water washing tank, a stirring rod of the stirring machine extends into a tank cavity of the water washing tank, the top of the water washing tank is also provided with a salt throwing port, a water outlet of the water washing tank is communicated with a water inlet of the molecular sieve through a pipeline, a permeate liquid conveying pipe of the molecular sieve is communicated with a water inlet of the NF nanofiltration integrated device, a concentrate conveying pipe of the molecular sieve is communicated with a water inlet of the CWAO catalytic wet oxidation device, a permeate liquid conveying pipe of the NF nanofiltration integrated device is communicated with a water inlet of the RO integrated device, a concentrate conveying pipe of the NF nanofiltration integrated device is communicated with a water inlet of the coagulating sedimentation device, the biochemical treatment device comprises an anoxic tank and a clean water tank, the liquid outlet end of the CWAO catalytic wet oxidation device is communicated with the anoxic tank of the biochemical treatment device through a degradation liquid conveying pipeline, the coagulating sedimentation device comprises a sedimentation device, the liquid outlet end of the sedimentation device is communicated with the anoxic tank of the biochemical treatment device through a supernatant conveying pipeline, and the permeate conveying pipeline of the RO integrated device is communicated with the clean water tank of the biochemical treatment device.

In a specific embodiment of the present invention, the sedimentation device of the coagulating sedimentation device is connected with a sludge pump at the water outlet end of the bottom, the sludge pump is communicated with a filter press through a pipeline, and one side of the filter press is connected with a sludge transporting device.

In another specific embodiment of the present invention, the biochemical treatment device further comprises an aerobic tank and an MBR membrane tank between the anoxic tank and the clean water tank, the upper part of the anoxic tank is formed with an anoxic tank outlet communicated with the aerobic tank, and the upper part of the aerobic tank is formed with an aerobic tank outlet communicated with the MBR membrane tank.

In another specific embodiment of the present invention, the bottom of the aerobic tank is provided with a plurality of aerobic tank aeration heads, the bottom of the MBR membrane tank is provided with a plurality of membrane tank aeration heads, and the aerobic tank aeration heads and the membrane tank aeration heads are communicated with an air blower arranged outside the biochemical treatment device through a pipeline.

The utility model discloses a still another concrete embodiment, install the MBR membrane module in the MBR membrane cisterna, the MBR membrane module have a self priming pump, the feed liquor end of this self priming pump is linked together through the pipeline with the play liquid end of MBR membrane module, and the play liquid end of this self priming pump is linked together through the pipeline with the clean water basin.

In still another specific embodiment of the present invention, the bottom of the MBR membrane tank is further provided with a lift pump, the lift pump is connected with a return pipe, and the outflow end of the return pipe extends into the anoxic tank.

In yet another specific embodiment of the present invention, the RO integration apparatus is further connected to a concentrate delivery pipe for delivering the concentrate to be used as a raw material in the chlor-alkali industry.

The utility model discloses owing to adopted above-mentioned structure, compare with prior art, the beneficial effect who has is: the method can carry out high-efficiency and environment-friendly treatment on the coal chemical industry waste salt, and achieves the purposes of grading treatment and gradient utilization, and the arrangement of the NF nanofiltration integrated equipment and the coagulating sedimentation device realizes the effective treatment on the divalent and trivalent ions in the coal chemical industry waste salt; concentrated solution outlet end through at RO integrated equipment sets up concentrated solution pipeline, has realized high-efficient processing and thorough zero release to coal industry high concentration brine waste to carry out resource utilization to wherein crystalline salt, both solved and produced the useless environmental problem of danger, carried out resource regeneration again to the danger and used, not only obtain considerable economic benefits, still promoted the healthy continuous stable development of chemical industry.

Drawings

Fig. 1 is an overall structural diagram of an embodiment of the present invention.

In the figure: 1. a water washing tank, 11 parts of a stirrer, 111 parts of a stirring rod and 12 parts of a salt feeding port; 2. a molecular sieve; NF nanofiltration integrated equipment; 4, RO integrated equipment, 41, a concentrated solution conveying pipeline; 5, a CWAO catalytic wet oxidation device, 51, a degradation liquid conveying pipeline; 6. the system comprises a coagulating sedimentation device, 61 precipitation equipment, 62 supernatant fluid conveying pipelines, 63 sludge pumps, 64 filter presses and 65 sludge outward transportation equipment; 7. biochemical treatment device, 71, anoxic tank, 72, clean water tank, 73, aerobic tank, 731, aerobic tank aeration head, 74, MBR membrane tank, 741, membrane tank aeration head, 742, MBR membrane module, 743, self-priming pump, 744, lifting pump, 745, return pipe, 75 and blower.

Detailed Description

The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings, but the description of the embodiments is not intended to limit the technical solutions, and any changes made in the form of the present invention rather than the essential changes should be considered as the protection scope of the present invention.

In the following description, all the concepts related to the directions or orientations of up, down, left, right, front and rear are based on the position state of fig. 1, and thus, should not be interpreted as a specific limitation to the technical solution provided by the present invention.

Referring to fig. 1, a system for recycling waste salts in coal chemical industry includes a water washing tank 1, a molecular sieve 2, an NF nanofiltration integrated device 3, an RO integrated device 4, a CWAO catalytic wet oxidation device 5, a coagulating sedimentation device 6, and a biochemical treatment device 7, where the biochemical treatment device 7 includes an anoxic tank 71 and a clean water tank 72. The middle of the top of the washing tank 1 is provided with a stirrer 11, a stirring rod 111 of the stirrer 11 extends into the tank cavity of the washing tank 1, and the top of the washing tank 1 is also provided with a salt feeding port 12. The waste salt is put into the washing tank 1 through the salt adding port 12, the mixed salt is dissolved in water through stirring of the stirring rod 111 for washing treatment, impurities which are insoluble in water are removed, and the mixed salt water which is dissolved in water is ready for treatment.

The water outlet of the water washing tank 1 is communicated with the water inlet of the molecular sieve 2 through a pipeline, high-salt water dissolved in water enters the molecular sieve 2 to be separated, the molecular sieve 2 selects resin with a specific aperture to adsorb most organic matters, the adsorbed organic matters are washed by alkaline liquor, a permeate liquid conveying pipe of the molecular sieve 2 is communicated with the water inlet of the NF nanofiltration integrated equipment 3, and a concentrate conveying pipe of the molecular sieve 2 is communicated with the water inlet of the CWAO catalytic wet oxidation device 5.

The NF nanofiltration integrated equipment 3 separates permeate of the molecular sieve 2 again, only monovalent ions pass through the NF nanofiltration integrated equipment 3, ions and organic matters with bivalent or more than bivalent ions are intercepted to be concentrated solution, the permeate flows into the RO integrated equipment 4, and the concentrated solution flows into the coagulating sedimentation device 6.

The RO integrated equipment 4 adopts a reverse osmosis mode, and utilizes pressure to enable water molecule leachate to permeate the reverse osmosis membrane and intercept molecules larger than 1nm, thereby achieving the purpose of treating the leachate. The water coming from the RO integrated equipment 4 is the permeate liquid formed in the NF nanofiltration integrated equipment 3, wherein the permeate liquid contains a large amount of sodium chloride NACl, the permeate liquid is separated into clear water liquid and concentrated liquid after being fully concentrated by the RO integrated equipment 4, the clear water liquid reaching the recycling standard is conveyed into a clear water tank 72 of the biochemical treatment device 7 through a permeate liquid conveying pipe to wait for recycling, and a large amount of NaCl contained in the concentrated liquid is output through a concentrated liquid conveying pipe 41 to be used as a raw material in the chlor-alkali industry.

In this embodiment, the CWAO catalytic wet oxidation apparatus 5 is a device for treating high-concentration organic wastewater by using a catalytic wet oxidation method, and the catalytic wet oxidation method (CWAO) is an advanced environmental protection technology for treating high-concentration organic wastewater that has been developed internationally in the mid eighties on the basis of the wet oxidation method, and specifically, organic matters and ammonia in wastewater are oxidized and decomposed into harmless substances such as carbon dioxide, water and nitrogen respectively by air and an oxidant under the action of a certain temperature, pressure and a catalyst, so as to achieve the purpose of purification. The concentrated solution containing a large amount of organic matters and obtained by concentrating the molecular sieve 2 flows into the CWAO catalytic wet oxidation device 5 to carry out CWAO catalytic oxidation reaction, and most of the organic matters are removed, and the degradation liquid is conveyed to an anoxic tank 71 of the biochemical treatment device 7 for biochemical treatment through a degradation liquid conveying pipeline 51 at the liquid outlet end of the CWAO catalytic wet oxidation device 5.

The coagulating sedimentation device 6 comprises a sedimentation device 61, the liquid outlet end of the sedimentation device 61 is communicated with an anoxic tank 71 of the biochemical treatment device 7 through a supernatant liquid conveying pipeline 62, the water outlet end of the bottom of the sedimentation device 61 is connected with a sludge pump 63, the sludge pump 63 is communicated with a filter press 64 through a pipeline, and one side of the filter press 64 is connected with a sludge outward transportation device 65. The concentrated solution formed by the filtration of the NF nanofiltration integration equipment 3 is subjected to coagulating sedimentation treatment in the coagulating sedimentation device 6 by adjusting the pH value and adding PAC (polyaluminium chloride) and PAM (polyacrylamide) coagulants, so that most of divalent and trivalent ions in the concentrated solution are precipitated, and part of organic matters can be removed by precipitation. Supernatant and sludge are formed after the precipitation operation, the supernatant enters an anoxic tank 71 of the biochemical treatment device 7, the precipitated sludge is conveyed by a sludge pump 63 and is pumped into a filter press 64 for filter pressing, and dry sludge formed by filter pressing is transported by a sludge transporting device 65 for transporting

The biochemical treatment device 7 is also provided with an aerobic tank 73 and an MBR membrane tank 74 between the anoxic tank 71 and the clean water tank 72, the upper part of the anoxic tank 71 is provided with an anoxic tank water outlet communicated with the aerobic tank 73, and the upper part of the aerobic tank 73 is provided with an aerobic tank water outlet communicated with the MBR membrane tank 74. The bottom of the aerobic tank 73 is provided with a plurality of aerobic tank aeration heads 731, the bottom of the MBR membrane tank 74 is provided with a plurality of membrane tank aeration heads 741, and the aerobic tank aeration heads 731 and the membrane tank aeration heads 741 are communicated with an air blower 75 arranged outside the biochemical treatment device 7 through pipelines. The MBR Membrane tank 74 is provided with an MBR Membrane module 742, the MBR Membrane is also called a Membrane bioreactor (Membrane Bio-Reactor), and is a novel water treatment technology unit combining a Membrane separation unit and a biological treatment unit, and the MBR Membrane module 742 can be an RGE100 type/150 type flat Membrane module produced by Nanjing Ruilite Membrane separation technology, Inc. The MBR membrane module 742 is provided with a self-priming pump 743, the liquid inlet end of the self-priming pump 743 is communicated with the liquid outlet end of the MBR membrane module 742 through a pipeline, and the liquid outlet end of the self-priming pump 743 is communicated with the clean water tank 72 through a pipeline. The bottom of the MBR membrane tank 74 is also provided with a lift pump 744, a return pipe 745 is connected to the lift pump 744, and the outflow end of the return pipe 745 is inserted into the anoxic tank 71.

In this embodiment, the incoming water of the anoxic tank 71 is the degradation liquid of the CWAO catalytic wet oxidation device 5 and the supernatant of the coagulation sedimentation device 6, and after the nitrification-denitrification treatment in the anoxic tank 71 and the aerobic tank 73, most of the organic matters and ammonia nitrogen in the liquid are removed and formed into mud water through the aeration treatment of the aerobic tank aeration head 731 and the membrane tank aeration head 741; and further muddy water enters the MBR membrane tank 74, the MBR membrane filters the muddy water into clear water through the self-priming pump 743 and conveys the clear water to the clear water tank 72 for reuse, and the activated sludge and microorganisms in the muddy water are left at the bottom of the MBR membrane tank 74, and the sludge-water mixture at the bottom of the MBR membrane tank 74 is conveyed by the lifting pump 744 and the return pipe 745 and flows back to the anoxic tank 71 for further denitrification treatment.

Referring to fig. 1, waste salt from coal chemical industry is put into a washing tank 1 through a salt adding port 12, the salt is dissolved in water by stirring through a stirrer 11 to be washed, insoluble impurities are removed, miscellaneous salt dissolved in water enters a molecular sieve 2 to be adsorbed and separated, organic matter of salt water is adsorbed and treated, the organic matter is back washed with alkali liquor after being adsorbed and saturated, and the back-washed concentrated solution flows into a CWAO catalytic wet oxidation device 5 to be subjected to CWAO catalytic oxidation reaction. Most organic matters in the concentrated solution are removed through CWAO catalytic oxidation reaction, and the degradation solution flows into a biochemical (A + O + MBR) treatment device 7. The permeate of the molecular sieve 2 flows into an NF nanofiltration integration device 3, permeate and concentrate are formed after nanofiltration operation of the NF nanofiltration integration device 3, monovalent ions such as sodium ions and chloride ions permeate and flow into the permeate, the permeate enters an RO integration device 4, divalent and more than divalent ions such as calcium ions and magnesium ions and organic matters are intercepted and removed from the concentrate, the concentrate enters a coagulating sedimentation device 6 for coagulating sedimentation operation, pH adjustment and PAC and PAM addition are carried out in the coagulating sedimentation device 6, most of the divalent and trivalent ions are precipitated, and part of the organic matters can also be precipitated and removed, supernatant after precipitation enters a biochemical treatment device 7, precipitated sludge is pumped into a filter press 64 through a sludge pump 63 for pressure filtration, and dry sludge is transported outside. The degradation liquid of the CWAO catalytic wet oxidation device 5 and the supernatant of the coagulating sedimentation device 6 enter an anoxic tank 71 of a biochemical treatment device 7, after nitrification-denitrification treatment in the anoxic tank 71 and an aerobic tank 73, most organic matters and ammonia nitrogen in sewage water liquid are removed and formed into muddy water through aeration treatment of an aerobic tank aeration head 731 and a membrane tank aeration head 741, clear water liquid formed by filtering the muddy water is conveyed to a clear water tank 72 to be reused, and active sludge and microorganisms in the muddy water flow back to the anoxic tank 71 for further denitrification treatment. The water coming from the RO integrated equipment 4 is the permeate liquid formed in the NF nanofiltration integrated equipment 3, wherein the permeate liquid contains a large amount of sodium chloride NACl, the clear water liquid formed by separating the permeate liquid after the RO integrated equipment 4 is fully concentrated enters the clear water tank 72 of the biochemical treatment device 7 for waiting for recycling, and the concentrate contains a large amount of NaCl which can be used as the raw material of the chlor-alkali process.

Claims

1. A resource utilization system for waste salts in coal chemical industry is characterized by comprising a water washing tank (1), a molecular sieve (2), an NF nanofiltration integrated device (3), an RO integrated device (4), a CWAO catalytic wet oxidation device (5), a coagulating sedimentation device (6) and a biochemical treatment device (7), wherein a stirrer (11) is arranged in the middle of the top of the water washing tank (1), a stirring rod (111) of the stirrer (11) extends into a tank cavity of the water washing tank (1), a salt feeding port (12) is further formed in the top of the water washing tank (1), a water outlet of the water washing tank (1) is communicated with a water inlet of the molecular sieve (2) through a pipeline, a permeate liquid conveying pipe of the molecular sieve (2) is communicated with a water inlet of the NF nanofiltration integrated device (3), a concentrate liquid conveying pipe of the molecular sieve (2) is communicated with a water inlet of the CWAO catalytic wet oxidation device (5), a permeate conveying pipe of the NF nanofiltration integrated equipment (3) is communicated with a water inlet of the RO integrated equipment (4), a concentrated solution conveying pipe of the NF nanofiltration integrated equipment (3) is communicated with a water inlet of the coagulating sedimentation device (6), the biochemical treatment device (7) comprises an anoxic tank (71) and a clean water tank (72), the liquid outlet end of the CWAO catalytic wet oxidation device (5) is communicated with an anoxic tank (71) of the biochemical treatment device (7) through a degradation liquid conveying pipeline (51), the coagulating sedimentation device (6) comprises a sedimentation device (61), the liquid outlet end of the sedimentation device (61) is communicated with an anoxic tank (71) of the biochemical treatment device (7) through a supernatant fluid conveying pipeline (62), and a permeate delivery pipe of the RO integrated equipment (4) is communicated with a clean water tank (72) of the biochemical treatment device (7).

2. The system for recycling the coal chemical industry waste salt as claimed in claim 1, wherein a sludge pump (63) is connected to the sedimentation device (61) of the coagulating sedimentation device (6) at the water outlet end of the bottom, the sludge pump (63) is communicated with a filter press (64) through a pipeline, and a sludge outward transport device (65) is connected to one side of the filter press (64).

3. The system for recycling coal chemical industry waste salt according to claim 1, characterized in that the biochemical treatment device (7) is further provided with an aerobic tank (73) and an MBR membrane tank (74) between the anoxic tank (71) and the clean water tank (72), the upper part of the anoxic tank (71) is provided with an anoxic tank water outlet communicated with the aerobic tank (73), and the upper part of the aerobic tank (73) is provided with an aerobic tank water outlet communicated with the MBR membrane tank (74).

4. The system for recycling the waste salt in the coal chemical industry as recited in claim 3, wherein a plurality of aeration heads (731) of the aerobic tank are disposed at the bottom of the aerobic tank (73), a plurality of aeration heads (741) of the membrane tank are disposed at the bottom of the MBR membrane tank (74), and the aeration heads (731) and the aeration heads (741) of the aerobic tank are connected to a blower (75) disposed outside the biochemical treatment device (7) through a pipeline.

5. The system for recycling the waste salts in the coal chemical industry as claimed in claim 3, wherein the MBR membrane module (742) is installed in the MBR membrane tank (74), the MBR membrane module (742) is provided with a self-priming pump (743), the liquid inlet end of the self-priming pump (743) is communicated with the liquid outlet end of the MBR membrane module (742) through a pipeline, and the liquid outlet end of the self-priming pump (743) is communicated with the clean water tank (72) through a pipeline.

6. The system for recycling the waste salt in the coal chemical industry as claimed in claim 3, wherein a lift pump (744) is further installed at the bottom of the MBR membrane tank (74), a return pipe (745) is connected to the lift pump (744), and the outflow end of the return pipe (745) is inserted into the anoxic tank (71).

7. The system for recycling the waste salts in the coal chemical industry as claimed in claim 1, wherein the RO integration equipment (4) is further connected with a concentrated solution delivery pipeline (41) for outputting concentrated solution to be used as raw materials in the chlor-alkali industry.