CN108751513B - System for be used for thermal desorption to contain mercury waste water treatment and mercury recycling recovery thereof - Google Patents
System for be used for thermal desorption to contain mercury waste water treatment and mercury recycling recovery thereof Download PDFInfo
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- CN108751513B CN108751513B CN201810802972.0A CN201810802972A CN108751513B CN 108751513 B CN108751513 B CN 108751513B CN 201810802972 A CN201810802972 A CN 201810802972A CN 108751513 B CN108751513 B CN 108751513B
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- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 title claims abstract description 94
- 229910052753 mercury Inorganic materials 0.000 title claims abstract description 89
- 238000003795 desorption Methods 0.000 title claims abstract description 39
- 238000011084 recovery Methods 0.000 title claims abstract description 25
- 238000004064 recycling Methods 0.000 title claims abstract description 17
- 238000004065 wastewater treatment Methods 0.000 title claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 61
- 238000004062 sedimentation Methods 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000001816 cooling Methods 0.000 claims abstract description 34
- 238000009833 condensation Methods 0.000 claims abstract description 28
- 230000005494 condensation Effects 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims abstract description 27
- 239000010802 sludge Substances 0.000 claims abstract description 21
- 239000000428 dust Substances 0.000 claims abstract description 20
- 238000006243 chemical reaction Methods 0.000 claims abstract description 15
- 239000004744 fabric Substances 0.000 claims abstract description 10
- 239000007790 solid phase Substances 0.000 claims abstract description 9
- 238000003825 pressing Methods 0.000 claims abstract description 6
- 239000006228 supernatant Substances 0.000 claims abstract description 6
- 238000001179 sorption measurement Methods 0.000 claims description 13
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims description 2
- 238000004321 preservation Methods 0.000 claims description 2
- 238000007789 sealing Methods 0.000 claims description 2
- 229910052717 sulfur Inorganic materials 0.000 claims description 2
- 239000011593 sulfur Substances 0.000 claims description 2
- 239000002351 wastewater Substances 0.000 abstract description 18
- 239000002002 slurry Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 23
- 230000008569 process Effects 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 10
- 239000002910 solid waste Substances 0.000 description 6
- 239000002689 soil Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- 239000002245 particle Substances 0.000 description 3
- 230000008439 repair process Effects 0.000 description 3
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 150000002731 mercury compounds Chemical class 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 238000005067 remediation Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- UCKMPCXJQFINFW-UHFFFAOYSA-N Sulphide Chemical compound [S-2] UCKMPCXJQFINFW-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- -1 mercury ions Chemical class 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229940008718 metallic mercury Drugs 0.000 description 1
- 238000000197 pyrolysis Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000009287 sand filtration Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- QXKXDIKCIPXUPL-UHFFFAOYSA-N sulfanylidenemercury Chemical compound [Hg]=S QXKXDIKCIPXUPL-UHFFFAOYSA-N 0.000 description 1
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/002—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by condensation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/06—Reclamation of contaminated soil thermally
- B09C1/065—Reclamation of contaminated soil thermally by pyrolysis
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
- C02F11/04—Anaerobic treatment; Production of methane by such processes
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2253/00—Adsorbents used in seperation treatment of gases and vapours
- B01D2253/10—Inorganic adsorbents
- B01D2253/102—Carbon
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
-
- 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
-
- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
-
- 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
- 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
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/18—Nature of the water, waste water, sewage or sludge to be treated from the purification of gaseous effluents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Hydrology & Water Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Water Supply & Treatment (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Mechanical Engineering (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Soil Sciences (AREA)
- Health & Medical Sciences (AREA)
- Molecular Biology (AREA)
- Thermal Sciences (AREA)
- Treating Waste Gases (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
A system for treating waste water containing mercury by thermal desorption and recycling the mercury. The water outlet of the condensation cooling device is communicated with the water inlet of the settling tank, the supernatant water outlet of the settling tank is communicated with the heat exchanger, the heat exchanger is communicated with the circulating water inlet of the condensation cooling device and the cooling tower, the outlet of the sludge tank is communicated with the slurry inlet of the plate-and-frame filter press, the filter-pressing liquid pipeline of the plate-and-frame filter press is communicated with the inlet of the first settling tank, the water outlet of the first settling tank is communicated with the inlet of the reaction tank, the outlet of the reaction tank is communicated with the inlet of the second settling tank, the water outlet of the second settling tank is communicated with the inlet of the activated carbon filter, the outlet of the activated carbon filter is communicated with the inlet of the cloth bag filter, and the liquid mercury pipeline of the first settling tank is communicated with the mercury-rich liquid recovery tank; the mercury-containing sludge pipeline of the second sedimentation tank is communicated with the mercury-containing sludge inlet of the plate-and-frame filter press, and the solid phase outlet of the thermal desorption device is communicated with the solid phase outlet of the high-temperature resistant dust removal device.
Description
Technical Field
The invention relates to a system for treating and recycling mercury-containing wastewater by thermal desorption and recycling mercury, and belongs to the technical field of mercury-containing wastewater treatment and recycling mercury.
Background
The remediation technology of the mercury pollution of the soil mainly comprises a solidification and stabilization technology, a soil leaching technology, a plant remediation technology, a thermal desorption technology and the like. Among them, the thermal desorption technology is considered as one of the best technologies for treating high-concentration mercury-containing soil/solid waste because of the characteristics of short treatment time, good repair effect, small secondary pollution and the like. The thermal desorption repair technology is a repair technology which utilizes the volatile characteristic of mercury to heat mercury-containing solid waste to the critical boiling point of pollutants, volatilizes mercury and compounds thereof adsorbed in the mercury-containing solid waste in a gaseous form, and finally intensively treats the gaseous pollutants. At present, a condensation method and a solution absorption method are mainly adopted for the treatment method of mercury vapor. The condensation method is divided into two modes of direct condensation and indirect condensation, wherein the indirect condensation mode has lower heat exchange efficiency and better heat exchange effect, but a large amount of process wastewater is generated no matter what mode is adopted. At present, the treatment methods for the mercury-containing wastewater comprise a flocculation precipitation method, a sulfide precipitation method, an active carbon adsorption method, a metal reduction method and the like, and the methods are mainly aimed at the treatment of the mercury-containing wastewater in the chlor-alkali industry and the like, but are not aimed at the treatment of the mercury-containing waste thermal desorption process wastewater. The existing treatment method for thermal desorption process wastewater is simple, and elemental mercury cannot be recovered to the maximum extent, so that energy waste is caused. The invention discloses a mercury contaminated soil thermal desorption device and a treatment method, wherein the application publication number is CN104289513A, and the application publication date is 2015, 1 and 21. In the invention, the thermal desorption process wastewater is only subjected to mud-water separation and quartz sand filtration, so that ionic mercury in the wastewater is difficult to remove, thereby reaching the recycling standard, and the elemental mercury cannot be recovered to the maximum extent.
Disclosure of Invention
The invention aims to solve the problems in the prior art and further provides a system for treating thermal desorption mercury-containing wastewater and recycling mercury.
The invention aims at realizing the following technical scheme:
a system for thermal desorption mercury-containing wastewater treatment and its mercury recycling recovery, comprising: the device comprises thermal desorption equipment, high-temperature resistant dust removal equipment, condensation cooling equipment, sulfur-carrying activated carbon adsorption tanks, induced draft fans, sedimentation tanks, sludge tanks, plate-and-frame filter presses, a first sedimentation tank, a reaction tank, a second sedimentation tank, an activated carbon filter, a cloth bag filter, a mercury-rich liquid recovery tank, a heat exchanger and a cooling tower, wherein a gas outlet of the thermal desorption equipment is communicated with a gas inlet of the high-temperature resistant dust removal equipment, a gas outlet of the high-temperature resistant dust removal equipment is communicated with a gas inlet of the condensation cooling equipment, a gas outlet of the condensation cooling equipment is communicated with a gas inlet of the sulfur-carrying activated carbon adsorption tanks, and a gas outlet of the sulfur-carrying activated carbon adsorption tanks is communicated with an air inlet of the induced draft fans; the water outlet of the condensation cooling device is communicated with the water inlet of the settling tank, the supernatant water outlet of the settling tank is communicated with the heat exchanger, the heat exchanger is communicated with the circulating water inlet of the condensation cooling device and the cooling tower, a mud pipe at the bottom of the settling tank is communicated with the inlet of the mud tank, the outlet of the mud tank is communicated with the mud inlet of the plate-and-frame filter press, the filter-pressing liquid pipeline of the plate-and-frame filter press is communicated with the inlet of the first settling tank, the water outlet of the first settling tank is communicated with the inlet of the reaction tank, the outlet of the reaction tank is communicated with the inlet of the second settling tank, the water outlet of the second settling tank is communicated with the inlet of the activated carbon filter, the outlet of the activated carbon filter is communicated with the inlet of the cloth bag filter, and the liquid mercury pipeline of the first settling tank is communicated with the mercury-rich liquid recovery tank; the mercury-containing sludge pipeline of the second sedimentation tank is communicated with the mercury-containing sludge inlet of the plate-and-frame filter press, and the solid phase outlet of the thermal desorption device is communicated with the solid phase outlet of the high-temperature resistant dust removal device.
Compared with the prior art, the invention has the following advantages:
(1) After the thermal desorption process wastewater is treated by the system, the recovery of the elemental mercury can be realized to the maximum extent, and the recycling recovery of the mercury is realized.
(2) The process wastewater generated in the tail gas treatment unit is completely recycled after being treated, and is not discharged, so that resources are saved.
(3) The invention can convert mercury compounds into mercury simple substances and improve the recovery rate of the simple substance mercury.
Drawings
FIG. 1 is a schematic diagram of a system for thermal desorption of mercury-containing wastewater treatment and its mercury recycling recovery system according to the present invention.
FIG. 2 is a schematic diagram of a sulfur-loaded activated carbon canister 4
In the figure, reference numeral 1 is a thermal desorption device, 2 is a high temperature resistant dust removing device, 3 is a condensation cooling device, 4 is a sulfur-carrying activated carbon adsorption tank, 5 is an induced draft fan, 6 is a sedimentation tank, 7 is a sludge tank, 8 is a plate-and-frame filter press, 9 is a first sedimentation tank, 10 is a reaction tank, 11 is a second sedimentation tank, 12 is an activated carbon filter, 13 is a cloth bag filter, 14 is a mercury-rich liquid recovery tank, 15 is a heat exchanger, 16 is a cooling tower, and 17 is sulfur-carrying activated carbon.
Detailed Description
The invention will be described in further detail with reference to the accompanying drawings: the present embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation is given, but the scope of protection of the present invention is not limited to the following embodiments.
As shown in fig. 1, a recovery system for thermal desorption of mercury-containing wastewater treatment and mercury recycling thereof according to this embodiment includes: the device comprises thermal desorption equipment 1, high-temperature resistant dust removal equipment 2, condensation cooling equipment 3, a sulfur-carrying activated carbon adsorption tank 4, a draught fan 5, a sedimentation tank 6, a sludge tank 7, a plate-and-frame filter press 8, a first sedimentation tank 9, a reaction tank 10, a second sedimentation tank 11, an activated carbon filter 12, a cloth bag filter 13, a mercury-rich liquid recovery tank 14, a heat exchanger 15 and a cooling tower 16, wherein a gas outlet of the thermal desorption equipment 1 is communicated with a gas inlet of the high-temperature resistant dust removal equipment 2, a gas outlet of the high-temperature resistant dust removal equipment 2 is communicated with a gas inlet of the condensation cooling equipment 3, a gas outlet of the condensation cooling equipment 3 is communicated with a gas inlet of the sulfur-carrying activated carbon adsorption tank 4, and a gas outlet of the sulfur-carrying activated carbon adsorption tank 4 is communicated with an air inlet of the draught fan 5; the condensation waste pipe of the condensation cooling device 3 is communicated with the water inlet of the sedimentation tank 6, the water outlet pipe of the sedimentation tank 6 is communicated with the water inlet pipe of the heat exchanger 15, the water outlet pipe of the heat exchanger 15 is communicated with the water inlet of the condensation cooling device 3, the heat exchanger 15 is communicated with the cooling tower 16, the slurry pipe at the bottom of the sedimentation tank 6 is communicated with the inlet of the sludge tank 7, the outlet of the sludge tank 7 is communicated with the slurry inlet of the plate-and-frame filter press 8, the liquid mercury pipeline and the filter-press water pipeline of the plate-and-frame filter press 8 are communicated with the inlet of the first sedimentation tank 9, the water outlet of the first sedimentation tank 9 is communicated with the inlet of the reaction tank 10, the outlet of the reaction tank 10 is communicated with the inlet of the second sedimentation tank 11, the water outlet of the second sedimentation tank 11 is communicated with the inlet of the activated carbon filter 12, the outlet of the activated carbon filter 12 is communicated with the inlet of the cloth bag filter 13, and the liquid mercury pipeline of the first sedimentation tank 9 is communicated with the mercury-rich liquid recovery tank 14; the mercury-containing sludge pipeline of the second sedimentation tank 11 is communicated with the mercury-containing sludge inlet of the plate-and-frame filter press 8, and the solid phase outlet of the thermal desorption device 1 is communicated with the solid phase outlet of the high-temperature resistant dust removal device 2.
The thermal desorption device 1 is used for pyrolysis of mercury-containing solid waste and soil, volatilizes mercury and compounds thereof in the mercury-containing waste, and is conveyed to the high-temperature-resistant dust removal device 2 through a pipeline.
The high-temperature resistant dust removing device 2 is used for removing solid-phase substances in high-temperature thermal desorption gas. The outer layer of the high temperature resistant dust removing device 2 is provided with a heat preservation and insulation layer, so that the phenomenon that the volatile mercury is re-condensed due to the fact that the temperature of tail gas is reduced in the dust removing process can be effectively avoided.
The condensation cooling device 3 is used for condensing and cooling the high-temperature desorption gas after dust removal, so that the high-temperature desorption gas is transferred to a water treatment and mercury recycling recovery unit for further treatment. The sulfur-carrying activated carbon adsorption tank 4 is a multistage serial device (see fig. 2), is connected with condensing and cooling equipment and is used for removing residual mercury in the tail gas and ensuring that the tail gas reaches the emission standard; the induced draft fan can enable the thermal desorption unit to keep micro negative pressure so as to ensure that gas desorbed by heat does not overflow and solid particles are generated as little as possible.
The sedimentation tank 6 is connected with the condensation cooling equipment 3 in the tail gas treatment unit and is used for collecting condensation cooling wastewater in the device, after the wastewater enters the sedimentation tank 6, under the action of gravity sedimentation, particulate matters and liquid mercury in the wastewater sink to the bottom, and supernatant in the sedimentation tank 6 is discharged from the top overflow weir and is reused for the cooling condensing equipment 3 after being cooled by the heat exchanger 15; the sludge tank 7 is connected with the sedimentation tank 6, mercury-containing slurry which is deposited at the bottom in the sedimentation tank 6 is pumped into the sludge tank 7 by a pump, and after the mercury-containing slurry is added by a chemical adding device, particles in the slurry are further flocculated and settled; the plate-and-frame filter press 8 is connected with the sludge tank 7, mercury-containing slurry in the sludge tank 7 is pumped into the plate-and-frame filter press 8 through a pump, mud cakes are generated after filter pressing, liquid mercury and filter pressing water enter the first sedimentation tank 9, the mud cakes generated by the plate-and-frame filter press 8 are collected and returned to the thermal desorption equipment 1 to react with activated carbon in a high-temperature anaerobic environment, mercury compounds such as HgS in the mud cakes are converted into elemental mercury in the high-temperature anaerobic environment, and the liquid mercury is recovered after passing through the process water treatment unit; the first sedimentation tank 9 utilizes the specific gravity difference between liquid mercury and water to enable the liquid mercury to sink to the bottom, and the supernatant enters the reaction tank; the mercury-rich liquid recovery tank 14 is connected with the bottom of the first sedimentation tank 9, and liquid mercury precipitated in the first sedimentation tank 9 enters the mercury-rich liquid recovery tank 14 after being collected; the mercury-rich liquid recovery tank 14 is a sealing device and is used for storing separated liquid mercury; the reaction tank 10 is connected with the first sedimentation tank 9, is provided with a dosing device and a stirrer, and is used for adjusting the pH value of the wastewater and adding a medicament to enable mercury ions to react to generate mercury sulfide sediment which is difficult to dissolve in water; the second sedimentation tank 11 is connected with the reaction tank 10 and is used for separating mud from water, the mercury-containing sludge is lifted into the plate-and-frame filter press 8 by a sludge pump for filter pressing after being sedimentated, and the supernatant fluid flows into the activated carbon filter 12 through an effluent weir; the activated carbon filter 12 is connected with the second sedimentation tank 11 and is used for removing residual mercury in water; the cloth bag filter 13 is connected with the activated carbon filter 12 and is used for removing residual solid particles in water, and the water discharged after filtering by the cloth bag can be used as water for discharging, cooling and humidifying of the thermal desorption equipment.
Example 1
In a certain project, a thermal desorption technology is adopted to treat mercury-containing solid waste (the total mercury content is about 300-1000 mg/kg), a large amount of mercury-containing process wastewater is generated in the repairing process, and the mercury content in the effluent of the condensation cooling equipment is about 4.2mg/L after detection, and after the wastewater is treated by the set of process system, the mercury content in the effluent is only 0.01mg/L, thereby meeting the comprehensive discharge standard of sewage. On site disposal 100m 3 The solid waste recovers about 4kg of metallic mercury.
In the foregoing, the present invention is merely preferred embodiments, which are based on different implementations of the overall concept of the invention, and the protection scope of the invention is not limited thereto, and any changes or substitutions easily come within the technical scope of the present invention as those skilled in the art should not fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.
Claims (4)
1. A system for thermal desorption of mercury-containing wastewater treatment and its mercury recycling recovery, comprising: the device comprises thermal desorption equipment, high-temperature resistant dust removal equipment, condensation cooling equipment, sulfur-carrying activated carbon adsorption tanks, induced draft fans, sedimentation tanks, sludge tanks, plate-and-frame filter presses, a first sedimentation tank, a reaction tank, a second sedimentation tank, an activated carbon filter, a cloth bag filter, a mercury-rich liquid recovery tank, a heat exchanger and a cooling tower, wherein a gas outlet of the thermal desorption equipment is communicated with a gas inlet of the high-temperature resistant dust removal equipment, a gas outlet of the high-temperature resistant dust removal equipment is communicated with a gas inlet of the condensation cooling equipment, a gas outlet of the condensation cooling equipment is communicated with a gas inlet of the sulfur-carrying activated carbon adsorption tanks, and a gas outlet of the sulfur-carrying activated carbon adsorption tanks is communicated with an air inlet of the induced draft fans; the water outlet of the condensation cooling device is communicated with the water inlet of the settling tank, the supernatant water outlet of the settling tank is communicated with the heat exchanger, the heat exchanger is communicated with the circulating water inlet of the condensation cooling device and the cooling tower, a mud pipe at the bottom of the settling tank is communicated with the inlet of the mud tank, the outlet of the mud tank is communicated with the mud inlet of the plate-and-frame filter press, the filter-pressing liquid pipeline of the plate-and-frame filter press is communicated with the inlet of the first settling tank, the water outlet of the first settling tank is communicated with the inlet of the reaction tank, the outlet of the reaction tank is communicated with the inlet of the second settling tank, the water outlet of the second settling tank is communicated with the inlet of the activated carbon filter, the outlet of the activated carbon filter is communicated with the inlet of the cloth bag filter, and the liquid mercury pipeline of the first settling tank is communicated with the mercury-rich liquid recovery tank; the mercury-containing sludge pipeline of the second sedimentation tank is communicated with the mercury-containing sludge inlet of the plate-and-frame filter press, and the solid phase outlet of the thermal desorption device is communicated with the solid phase outlet of the high-temperature resistant dust removal device.
2. The system for thermal desorption of mercury-containing wastewater treatment and mercury recycling recovery thereof according to claim 1, wherein the outer layer of the high temperature resistant dust removal device is provided with a heat preservation and insulation layer.
3. The system for thermal desorption of mercury containing wastewater treatment and its mercury recycling recovery according to claim 1, wherein the sulfur-loaded activated carbon adsorption tank is a multistage series device.
4. The system for thermal desorption of mercury containing wastewater treatment and its mercury recycling recovery of claim 1, wherein the mercury rich liquid recovery tank is a sealing device.
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