CN116216883A - Graphite purification wastewater treatment device and wastewater treatment method thereof - Google Patents
Graphite purification wastewater treatment device and wastewater treatment method thereof Download PDFInfo
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- CN116216883A CN116216883A CN202310059793.3A CN202310059793A CN116216883A CN 116216883 A CN116216883 A CN 116216883A CN 202310059793 A CN202310059793 A CN 202310059793A CN 116216883 A CN116216883 A CN 116216883A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 239000010439 graphite Substances 0.000 title claims abstract description 68
- 229910002804 graphite Inorganic materials 0.000 title claims abstract description 68
- 238000000746 purification Methods 0.000 title claims abstract description 46
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 93
- 239000002351 wastewater Substances 0.000 claims abstract description 51
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims abstract description 46
- 235000011941 Tilia x europaea Nutrition 0.000 claims abstract description 46
- 239000004571 lime Substances 0.000 claims abstract description 46
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 36
- 238000004062 sedimentation Methods 0.000 claims abstract description 33
- 238000006243 chemical reaction Methods 0.000 claims abstract description 31
- 238000011282 treatment Methods 0.000 claims abstract description 26
- 239000011347 resin Substances 0.000 claims abstract description 23
- 229920005989 resin Polymers 0.000 claims abstract description 23
- 238000001179 sorption measurement Methods 0.000 claims abstract description 22
- 238000005352 clarification Methods 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 18
- 239000007787 solid Substances 0.000 claims abstract description 10
- 239000003814 drug Substances 0.000 claims abstract description 9
- 238000005192 partition Methods 0.000 claims abstract description 3
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims description 20
- 239000010802 sludge Substances 0.000 claims description 20
- 238000010517 secondary reaction Methods 0.000 claims description 10
- 230000014759 maintenance of location Effects 0.000 claims description 7
- 238000001556 precipitation Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 6
- 238000011221 initial treatment Methods 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 4
- 239000006228 supernatant Substances 0.000 claims description 4
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 abstract description 13
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 5
- 239000002699 waste material Substances 0.000 abstract description 3
- 229910052799 carbon Inorganic materials 0.000 description 10
- -1 fluoride ions Chemical class 0.000 description 9
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 8
- 239000000920 calcium hydroxide Substances 0.000 description 6
- 229910001861 calcium hydroxide Inorganic materials 0.000 description 6
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 5
- 239000007770 graphite material Substances 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 4
- 239000011737 fluorine Substances 0.000 description 4
- 229910052731 fluorine Inorganic materials 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229910001634 calcium fluoride Inorganic materials 0.000 description 3
- 238000005265 energy consumption Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000001112 coagulating effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000012530 fluid Substances 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002244 precipitate Substances 0.000 description 2
- 229910004261 CaF 2 Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 229910002651 NO3 Inorganic materials 0.000 description 1
- NHNBFGGVMKEFGY-UHFFFAOYSA-N Nitrate Chemical compound [O-][N+]([O-])=O NHNBFGGVMKEFGY-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910003460 diamond Inorganic materials 0.000 description 1
- 239000010432 diamond Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000005188 flotation Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- 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
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- 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
- C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
-
- 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
- C02F2101/12—Halogens or halogen-containing compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
- C02F2101/14—Fluorine or fluorine-containing compounds
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention discloses a graphite purification wastewater treatment device and a wastewater treatment method thereof, and aims to solve the problems that effluent fluoride cannot reach the standard stably in the existing graphite purification wastewater treatment process, a large amount of dangerous wastes are generated at the same time, and the like. In the graphite purification wastewater treatment device, a raw water tank, a lime clarification tank, a vertical flow sedimentation tank, a first intermediate water tank, a second reaction tank and a second intermediate water tank are sequentially arranged along the water flow direction, solid lime medicament is added into the lime clarification tank, wherein the second reaction tank is sequentially separated into a first dosing region, a second dosing region and a sedimentation region through a partition plate, and effluent of the second intermediate water tank sequentially passes through an active alumina filter bed unit and a resin adsorption unit. The chloride of the inlet water of the graphite purification wastewater is 4080mg/L, and the chloride of the outlet water is less than 100mg/L after treatment; 4050mg/L of fluoride is added into the water, and the fluoride content is less than 5mg/L after treatment.
Description
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a graphite purification wastewater treatment device and a wastewater treatment method thereof.
Background
Graphite is an important resource nonmetallic mineral, and has good performances of corrosion resistance, radiation resistance, electric conduction, heat conduction, self lubrication, high and low temperature resistance and the like.
Graphite ore is processed into graphite material, which is first technically purified. The graphite raw material comprises fixed carbon, volatile phenol, ash and other substances. The content of fixed carbon determines the quality of graphite, the content of the graphite is 50-75% of low-carbon graphite, the content of the graphite is 80-93% of medium-carbon graphite, the content of the graphite is 94-99% of high-carbon graphite, and the content of the graphite is more than 99.9% of high-purity graphite. The quality of graphite purification determines the use characteristics and comprehensive properties of the graphite material, and the higher the purity of the graphite, the higher the application value. Whether it is used as raw material for artificial diamond, cathode material for lithium ion battery, bipolar material for fuel cell, sealing, heat conducting expanded graphite material, or special graphite material for aviation, national defense and nuclear industry, the purity of graphite is required to be 99% -99.99% of carbon, even higher. Therefore, graphite purification is a premise and basis for expanding and applying graphite materials.
The purification process of graphite mainly comprises the following (table 1): (1) The flotation method has low requirements on equipment and low energy consumption, but the purity of the purification is limited, and the carbon content of the product is 80% -90%; (2) The alkaline acid method has strong universality, the equipment investment is less, the grade of the produced graphite is high and can reach 99% -99.9%, but the energy consumption is high, the equipment corrosion is serious, and the process flow is long; (3) The hydrofluoric acid method has low production cost, the carbon content of the product is 99 to 99.9 percent, but the hydrofluoric acid contains extremely toxic and has serious influence on the environment; (4) The chloridizing roasting method has high efficiency, the carbon content of the product is about 98%, but the running equipment is complex, the purity of the product is limited, the stability is poor, and serious pollution is brought to the environment; (5) The high-temperature method for producing the product has the carbon content of 99.99% or more, but the treatment method is specially designed according to the specific conditions of raw materials and factories, but the one-time investment is large and the energy consumption is large.
Table 1: comparative analysis of graphite purification method
Enterprises generally adopt a hydrofluoric acid method to dissolve silicate, silicon dioxide and the like in ores by adding a large amount of hydrofluoric acid and simultaneously adding strong acids such as sulfuric acid, hydrochloric acid, nitric acid and the like, so that a lot of high-concentration acidic fluorine-containing wastewater is generated due to economic and practical considerations.
At present, most enterprises adopt a direct lime adding method to treat fluorine-containing wastewater, and fluoride in graphite purification wastewater is difficult to reach the standard (less than 10 mg/L) stably (wastewater comprehensive emission standard GB 8978-1996). Graphite purification wastewater has become a major source of environmental pollution. The problem of waste water pollution control of graphite factories becomes a problem which needs to be solved urgently for the development of graphite industry.
Disclosure of Invention
The invention aims to solve the problems that effluent fluoride cannot reach the standard stably, a large amount of dangerous waste is produced at the same time and the like in the existing graphite purification wastewater treatment process, and provides a graphite purification wastewater treatment device and a wastewater treatment method thereof.
The invention relates to a graphite purification wastewater treatment device, which comprises a lime clarifying tank, a vertical flow sedimentation tank, a first intermediate water tank, a second reaction tank, a second intermediate water tank, an active alumina filter bed unit and a resin adsorption unit, wherein a raw water tank, the lime clarifying tank, the vertical flow sedimentation tank, the first intermediate water tank, the second reaction tank and the second intermediate water tank are sequentially arranged along the water flow direction, all tank bodies (tank bodies) are connected through water pipes, a solid lime medicament is added into the lime clarifying tank, wherein the second reaction tank is sequentially separated into a first dosing area, a second dosing area and a sedimentation area through a baffle plate, PAC flocculant is added into the first dosing area, lime water (calcium hydroxide aqueous solution) is added into the second dosing area, an inclined plate component is arranged in the sedimentation area, the bottom of the sedimentation area is provided with a sludge discharge hole, one end of a sludge return pipe is connected with the sludge discharge hole of the sedimentation area, the other end of the sludge return pipe is connected with the lime clarifying tank, the water outlet of the second intermediate water tank is connected with a water inlet of the active alumina filter bed unit through a first pipeline, the active alumina filter bed unit is formed by two parallel active alumina filter bed units, and the active alumina filter bed unit is formed by water is connected with the water inlet of the active alumina filter bed unit through a water adsorption resin adsorption unit through a water adsorption unit.
The graphite purification wastewater treatment method is realized according to the following steps:
1. the graphite purified wastewater in the raw water tank flows into a lime clarification tank, solid lime medicament is added into the lime clarification tank, and the reaction is stirred for 20-30 min to obtain primary treatment wastewater;
2. the first-stage treatment wastewater flows into a vertical flow sedimentation tank, the hydraulic retention time is controlled to be 15-25 min, supernatant fluid flows into a first intermediate water tank, effluent of the first intermediate water tank flows into a second-stage reaction tank, PAC flocculant is added into a first dosing region of the second-stage reaction tank, lime water is added into a second dosing region, stirring reaction is carried out for 30-40 min in the first dosing region and the second dosing region, wastewater flows into the sedimentation region for mud-water separation, and mud residues flow back to the lime clarification tank through a mud return pipe to obtain second-stage treatment wastewater;
3. the secondary treatment wastewater flows into a second middle water tank, the effluent of the second middle water tank flows into an active alumina filter bed unit through a first pipeline, the effluent of the active alumina filter bed unit flows into a resin adsorption unit through a second pipeline, and the resin adsorption unit discharges water to finish the treatment of the graphite purification wastewater.
The invention relates to a graphite purification wastewater treatment device and a wastewater treatment method thereof, wherein multistage chemical coagulating sedimentation is adopted, lime agent is added into a first reaction tank, lime is dissolved in water to generate calcium hydroxide and react with fluoride ions in wastewater to generate calcium fluoride, the calcium fluoride is in a colloidal flocculent form, and the calcium fluoride flocculent forms a flocculent precipitate, but the wastewater contains anions such as chloride, sulfate, nitrate and the like to cause unstable water qualityIn the invention, PAC flocculant and lime water are continuously added into a secondary reaction tank, fluoride ions are flocculated and precipitated through an aluminum salt coagulant, and the lime water reacts with the fluoride ions to generate CaF 2 CaF obtained at this time 2 The crystal grain is small, the purity is high, and the CaF can be directly obtained by collecting 2 The powder (fluorite powder) achieves the purposes of waste utilization and reduction. The sludge in the sedimentation area in the secondary reaction tank flows back to the lime clarification tank through the sludge return pipe, and the fine sludge flows back to the lime clarification tank to serve as flocculation nucleus, so that the coagulation reaction is quickened, and the adding amount of lime medicament is reduced. The invention finally uses the active alumina filter bed and resin adsorption to carry out advanced treatment.
The graphite purification wastewater treatment device and the wastewater treatment method thereof of the invention have the following beneficial effects:
1. the invention adopts multistage chemical coagulating sedimentation to remove a large amount of fluoride ions, the concentration of the fluoride ions after the chemical treatment is about 20mg/L, and the fluoride ions can not reach the emission standard of integrated wastewater emission standard (GB 8978-1996), and the concentration of the fluoride ions is less than 10mg/L, so that the fluoride ions are deeply treated by adopting an active alumina filter bed and resin adsorption in the technical process, the concentration of the fluoride ions is less than 5mg/L, the high-efficiency removal and the high-efficiency desalination of fluoride are realized, and the fluoride is stable and reaches the standard after the graphite purification wastewater is treated.
2. Adopting a new high-purity graphite wastewater treatment process, optimizing treatment process parameters, and refluxing sludge sediment generated in the secondary reaction tank, thereby reducing the dosage of the medicament and reducing CaF generated in the secondary reaction tank 2 The precipitate can be used as fluorite powder.
3. The treatment capacity of the graphite purification wastewater treatment device is 60L/h, the chloride of the inlet water of the graphite purification wastewater is 4080mg/L, and the chloride of the outlet water is less than 100mg/L after treatment; 4050mg/L of fluoride is added into the water, and the fluoride content is less than 5mg/L after treatment; the graphite purification wastewater treatment system is stable and has low operation cost.
Drawings
FIG. 1 is a schematic diagram of a graphite purification wastewater treatment apparatus according to the present invention.
Detailed Description
The first embodiment is as follows: the graphite purification wastewater treatment device comprises a lime clarification tank 1, a vertical flow sedimentation tank 2, a first intermediate water tank 3, a second reaction tank 4, a second intermediate water tank 5, an activated alumina filter bed unit 6 and a resin adsorption unit 7, wherein a raw water tank 8, the lime clarification tank 1, the vertical flow sedimentation tank 2, the first intermediate water tank 3, the second reaction tank 4 and the second intermediate water tank 5 are sequentially arranged along the water flow direction, all tanks (tank bodies) are connected through water pipes, a solid lime medicament is added in the lime clarification tank 1, the second reaction tank 4 is sequentially separated by a partition plate to form a first dosing zone 4-1, a second dosing zone 4-2 and a precipitation zone 4-3, a PAC flocculant is added in the first dosing zone 4-1, lime water (calcium hydroxide aqueous solution) is added in the second dosing zone 4-2, an inclined plate component is arranged in the precipitation zone 4-3, the bottom of the precipitation zone 4-3 is provided with a sludge outlet, one end of a sludge return pipe 13 is connected with the sludge outlet of the precipitation zone 4-3, the other end of the return sludge pipe 13 is connected with the water outlet of the first alumina filter bed unit 6 through a water inlet 10, the activated alumina filter bed unit 7 is connected in parallel with the activated alumina filter bed unit 7 through a water inlet 6, and the activated alumina filter bed unit 7 is connected with the activated alumina filter bed unit 6 in parallel through a water inlet pipe 7.
In the second-stage reaction tank 4 of the present embodiment, the first dosing region 4-1, the second dosing region 4-2 and the precipitation region 4-3 are communicated.
In the embodiment, the effluent of the activated alumina filter bed unit reaches the standard, and can be directly discharged without passing through the resin adsorption unit.
The second embodiment is as follows: the first difference between the present embodiment and the specific embodiment is that a stirrer is arranged in the lime clarifier 1, and a mud discharging port is arranged at the bottom of the lime clarifier 1.
And a third specific embodiment: the present embodiment differs from the first or second embodiment in that the bottom of the vertical flow sedimentation tank 2 is provided with a sludge discharge port.
The specific embodiment IV is as follows: the present embodiment differs from the first to third embodiments in that agitators are provided in the first and second dosing sections 4-1, 4-2 of the secondary reaction tank 4.
Fifth embodiment: the first to fourth difference between the present embodiment and the specific embodiment is that the graphite purification wastewater treatment device further comprises a backwash water tank 9, and the water outlet of the backwash water tank 9 is connected with the backwash inlet at the bottom of the activated alumina filter bed unit 6 through a backwash water pipe 14.
Specific embodiment six: the fifth difference between this embodiment and the fifth embodiment is that a backwash drain outlet is formed in the top of the activated alumina filter bed unit 6, one end of a backwash return pipe 15 is connected to the backwash drain outlet, and the other end of the backwash return pipe 15 is connected to the original water tank 8.
Seventh embodiment: this embodiment differs from one to six embodiments in that the lime water has a mass concentration of 10%.
Eighth embodiment: the graphite purification wastewater treatment method of the embodiment is implemented according to the following steps:
1. the graphite purified wastewater in the raw water tank 8 flows into the lime clarification tank 1, solid lime medicament is added into the lime clarification tank 1, and the reaction is stirred for 20 to 30 minutes to obtain primary treatment wastewater;
2. the first-stage treatment wastewater flows into a vertical flow sedimentation tank 2, the hydraulic retention time is controlled to be 15-25 min, supernatant fluid flows into a first intermediate water tank 3, effluent of the first intermediate water tank 3 flows into a second-stage reaction tank 4, PAC flocculant is added into a first dosing region 4-1 of the second-stage reaction tank 4, lime water is added into a second dosing region 4-2, stirring reaction is carried out for 30-40 min in the first dosing region 4-1 and the second dosing region 4-2, wastewater flows into a sedimentation region 4-3 for mud-water separation, and mud residues flow back to a lime clarification tank 1 through a mud return pipe 13 to obtain second-stage treatment wastewater;
3. the secondary treatment wastewater flows into the second intermediate water tank 5, the effluent of the second intermediate water tank 5 flows into the activated alumina filter bed unit 6 through the first pipeline 10, the effluent of the activated alumina filter bed unit 6 flows into the resin adsorption unit 7 through the second pipeline 11, and the resin adsorption unit 7 discharges water, so that the treatment of the graphite purification wastewater is completed.
Detailed description nine: the eighth embodiment is different from the eighth embodiment in that the stirring reaction is controlled for 24min to 30min in the first step.
Detailed description ten: the difference between the present embodiment and the eighth embodiment is that the hydraulic retention time of the precipitation zone 4-3 is controlled to be 30-40 min in the second step.
Eleventh embodiment: the eighth difference between the present embodiment and the eighth embodiment is that when the fluoride content in the graphite purification wastewater in the raw water tank 8 is 3600 to 5000mg/L, the addition amount of the solid lime agent in the lime clarifier 1 is 6g to 7.5g per liter of wastewater, the addition amount of the PAC flocculant in the secondary reaction tank 4 is 1.5g to 2.0g per liter of wastewater, and the addition amount of lime water in the secondary reaction tank 4 is 1.5g to 2.5g per liter of wastewater (calculated by calcium hydroxide in lime water).
Examples: the method for wastewater treatment by using the graphite purification wastewater treatment device in the first embodiment is implemented according to the following steps:
1. the graphite purified wastewater in the raw water tank 8 flows into a lime clarification tank 1, solid lime agent is added into the lime clarification tank 1, the adding amount of the solid lime agent is 7.5g/L (calculated by calcium hydroxide), and the reaction is stirred for 24min to obtain primary treatment wastewater;
2. the first-stage treatment wastewater flows into a vertical flow sedimentation tank 2, the hydraulic retention time is controlled to be 15min, supernatant flows into a first intermediate water tank 3, effluent of the first intermediate water tank 3 flows into a second-stage reaction tank 4, PAC flocculant is added into a first dosing region 4-1 of the second-stage reaction tank 4, the addition amount of the PAC flocculant is 0.5g/L, lime water is added into a second dosing region 4-2, the addition amount of the lime water is 2g/L (calculated by calcium hydroxide), stirring and reacting are carried out for 30min in the first dosing region 4-1 and the second dosing region 4-2, wastewater flows into the sedimentation region 4-3 for mud-water separation, the hydraulic retention time of the sedimentation region 4-3 is controlled to be 30min, and mud flows back to the lime clarification tank 1 through a mud return pipe 13 to obtain second-stage treatment wastewater;
3. the secondary treatment wastewater flows into the second intermediate water tank 5, the effluent of the second intermediate water tank 5 flows into the activated alumina filter bed unit 6 through the first pipeline 10, the effluent of the activated alumina filter bed unit 6 flows into the fluorine removal resin adsorption unit 7 through the second pipeline 11, and the fluorine removal resin adsorption unit 7 discharges water, so that the treatment of the graphite purification wastewater is completed.
The graphite purification wastewater of the embodiment belongs to the production process wastewater which has high salinity, high concentration and harm to the environment and is difficult to treat. The treatment capacity of the graphite purification wastewater treatment device of this example was 60L/h. The filter material layer of the activated alumina bed of the embodiment is 1000mm in height, the diameter of the activated alumina filter bed is 200mm, and the overall height of the activated alumina filter bed is 1600mm. The resin adsorption layer in the resin adsorber is 1000mm in height, the diameter of the adsorber is 200mm, and the overall height of the resin adsorber is 1600mm. The volume of the lime clarifying tank 1 is 24L, the volume of the vertical flow sedimentation tank 2 is 15L, the volume of the dosing area in the secondary reaction tank 4 is 30L, and the volume of the sedimentation area is 30L. The fluorine ion content of the effluent of the vertical flow sedimentation tank 2 is about 100mg/L, and the fluorine ion content of the effluent of the secondary reaction tank 4 is lower than 20mg/L.
The water quality of the graphite purified wastewater and the treated effluent water quality of this example are shown in Table 1 below.
TABLE 1
The invention realizes that the effluent meets the water quality standard requirement of industrial wastewater reuse index of urban wastewater recycling industrial water quality (GB/T19923-2005), and simultaneously meets the characteristic index that the fluoride concentration is lower than 5mg/L.
Claims (10)
1. The graphite purification wastewater treatment device is characterized by comprising a lime clarifying tank (1), a vertical flow sedimentation tank (2), a first intermediate water tank (3), a second-stage reaction tank (4), a second intermediate water tank (5), an active alumina filter bed unit (6) and a resin adsorption unit (7), wherein a raw water tank (8), the lime clarifying tank (1), the vertical flow sedimentation tank (2), the first intermediate water tank (3), the second-stage reaction tank (4) and the second intermediate water tank (5) are sequentially arranged along the water flow direction, all the tanks are connected through water pipes, a solid lime medicament is added into the lime clarifying tank (1), the second-stage reaction tank (4) is sequentially separated into a first dosing zone (4-1), a second dosing zone (4-2) and a sedimentation zone (4-3) through a partition plate, a PAC flocculant is added into the first dosing zone (4-1), lime water is added into the sedimentation zone (4-3), an inclined plate assembly is arranged in the sedimentation zone (4-3), the bottom of the sedimentation zone (4-3) is provided with a sludge outlet (13) of a sludge return pipe (13) which is connected with one end of the sludge outlet (1), the water outlet of the second intermediate water tank (5) is connected with the water inlet of the active alumina filter bed unit (6) through a first pipeline (10), the active alumina filter bed unit (6) is composed of two active alumina filter beds which are connected in parallel, the water outlet of the active alumina filter bed unit (6) is connected with the water inlet of the resin adsorption unit (7) through a second pipeline (11), the resin adsorption unit (7) is composed of two resin adsorbers which are connected in parallel, and the water outlet of the resin adsorption unit (7) is discharged through a drain pipe (12).
2. The graphite purification wastewater treatment device according to claim 1, wherein a stirrer is arranged in the lime clarifier (1), and a sludge discharge port is arranged at the bottom of the lime clarifier (1).
3. The graphite purification wastewater treatment device according to claim 1, characterized in that a sludge discharge port is arranged at the bottom of the vertical flow sedimentation tank (2).
4. The graphite purification wastewater treatment device according to claim 1, wherein stirrers are provided in the first dosing zone (4-1) and the second dosing zone (4-2) in the secondary reaction tank (4).
5. The graphite purification wastewater treatment device according to claim 1, further comprising a backwash water tank (9), wherein the water outlet of the backwash water tank (9) is connected with the backwash inlet at the bottom of the activated alumina filter bed unit (6) through a backwash water pipe (14).
6. The graphite purification wastewater treatment device according to claim 5, wherein a backwash outlet is formed in the top of the activated alumina filter bed unit (6), one end of a backwash return pipe (15) is connected with the backwash outlet, and the other end of the backwash return pipe (15) is communicated with the original water tank (8).
7. The graphite purification wastewater treatment device according to claim 1, wherein the mass concentration of lime water is 10%.
8. The method for treating the graphite purification wastewater is characterized by comprising the following steps of:
1. the graphite purified wastewater in the raw water tank (8) flows into a lime clarification tank (1), solid lime medicament is added into the lime clarification tank (1), and the reaction is stirred for 20-30 min to obtain primary treatment wastewater;
2. the first-stage treatment wastewater flows into a vertical flow sedimentation tank (2), the hydraulic retention time is controlled to be 15-25 min, supernatant flows into a first intermediate water tank (3), effluent of the first intermediate water tank (3) flows into a second-stage reaction tank (4), PAC flocculant is added into a first dosing region (4-1) of the second-stage reaction tank (4), lime water is added into a second dosing region (4-2), stirring reaction is carried out for 30-40 min in the first dosing region (4-1) and the second dosing region (4-2), wastewater flows into the sedimentation region (4-3) for mud-water separation, and sludge flows back to a lime clarification tank (1) through a sludge return pipe (13) to obtain second-stage treatment wastewater;
3. the secondary treatment wastewater flows into a second intermediate water tank (5), the effluent of the second intermediate water tank (5) flows into an active alumina filter bed unit (6) through a first pipeline (10), the effluent of the active alumina filter bed unit (6) flows into a resin adsorption unit (7) through a second pipeline (11), and the resin adsorption unit (7) discharges water to finish the treatment of the graphite purification wastewater.
9. The method for treating graphite purification wastewater as set forth in claim 8, wherein the stirring reaction is controlled for 24 to 30 minutes in the first step.
10. The method for treating graphite purification wastewater as claimed in claim 8, wherein the hydraulic retention time of the precipitation zone (4-3) is controlled to be 30 to 40 minutes.
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