CN112919667A - Industrial heavy metal sewage treatment system - Google Patents
Industrial heavy metal sewage treatment system Download PDFInfo
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- CN112919667A CN112919667A CN201911237363.6A CN201911237363A CN112919667A CN 112919667 A CN112919667 A CN 112919667A CN 201911237363 A CN201911237363 A CN 201911237363A CN 112919667 A CN112919667 A CN 112919667A
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- China
- Prior art keywords
- heavy metal
- unit
- adsorption
- sludge
- tank
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 50
- 239000010865 sewage Substances 0.000 title claims abstract description 15
- 238000001179 sorption measurement Methods 0.000 claims abstract description 50
- 239000010802 sludge Substances 0.000 claims abstract description 39
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
- 238000004062 sedimentation Methods 0.000 claims abstract description 17
- 239000000463 material Substances 0.000 claims abstract description 15
- 239000002351 wastewater Substances 0.000 claims abstract description 15
- 150000002500 ions Chemical class 0.000 claims abstract description 13
- 230000008929 regeneration Effects 0.000 claims abstract description 13
- 238000011069 regeneration method Methods 0.000 claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 6
- 238000010992 reflux Methods 0.000 claims abstract description 3
- 230000006641 stabilisation Effects 0.000 claims description 8
- 238000011105 stabilization Methods 0.000 claims description 8
- 239000002244 precipitate Substances 0.000 claims description 7
- 230000007935 neutral effect Effects 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000003463 adsorbent Substances 0.000 claims 1
- 230000003750 conditioning effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 14
- 238000001556 precipitation Methods 0.000 abstract description 10
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract description 2
- 238000003795 desorption Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 230000001172 regenerating effect Effects 0.000 description 4
- 239000002699 waste material Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 3
- 239000013049 sediment Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000003889 chemical engineering Methods 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 238000011197 physicochemical method Methods 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000005987 sulfurization reaction Methods 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
-
- 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
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
- C02F1/62—Heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Water Treatment By Sorption (AREA)
Abstract
The invention provides an industrial heavy metal sewage treatment system which comprises a pretreatment unit, a reaction sedimentation tank, an adsorption unit, a post-treatment unit and a sludge treatment unit connected with the reaction sedimentation tank, wherein the pretreatment unit, the reaction sedimentation tank, the adsorption unit and the post-treatment unit are sequentially connected; the adsorption unit comprises a heavy metal adsorption device and an adsorption material regeneration device, the first reflux pipe is connected between the adsorption material regeneration device and the regulating tank, and the heavy metal adsorption device is connected with the post-treatment unit. The method has the beneficial effects that the neutralization precipitation method and the activated carbon adsorption method are combined for treatment, so that heavy metal ions in the wastewater can be completely removed; the regeneration times of the activated carbon are reduced, and the cost is saved; the adsorbed heavy metal can be enriched, and the recycling of the heavy metal is facilitated.
Description
Technical Field
The invention belongs to the field of environmental protection, and particularly relates to an industrial heavy metal sewage treatment system.
Background
In some industrial fields, such as the industries of electronics, chemical engineering, metallurgy and the like, a large amount of heavy metal wastewater can be generated, heavy metals are not easy to degrade in organisms and only can be migrated, when the heavy metals in the organisms are enriched to a certain degree, the organisms can be greatly damaged, and even serious people can die.
At present, the biodegradability of industrial wastewater containing heavy metals is mostly poor, so physicochemical methods such as chemical precipitation or adsorption are mainly adopted for treatment; at present, different precipitation methods have different treatment defects, for example, the calcium ions in the wastewater are too much due to the precipitation of the added limestone; the sulfuration precipitation method can generate pollutants such as hydrogen sulfide and the like in the treatment process; the hydroxide precipitation method is difficult to remove heavy metal ions because the precipitation moisture content is too large and is difficult to treat, and the pH value of hydroxide generated by different heavy metal ions is different; the adsorption method usually adopts activated carbon or ion resin for adsorption, but the adsorption saturation needs regeneration, the treatment cost is high, and the adsorbed heavy metal ions are difficult to collect and recycle.
Disclosure of Invention
In order to solve the technical problem, the invention provides an industrial heavy metal sewage treatment system.
The specific technical scheme is as follows:
the industrial heavy metal sewage treatment system is characterized by comprising a pretreatment unit, a reaction sedimentation tank, an adsorption unit, a post-treatment unit and a sludge treatment unit connected with the reaction sedimentation tank which are sequentially connected, wherein a first return pipe is connected between the adsorption unit and the pretreatment unit, and a second return pipe is connected between the sludge treatment unit and the pretreatment unit;
the pretreatment unit is used for primarily adjusting water quality, the reaction sedimentation tank is used for adjusting the pH value of wastewater to be alkaline and reacting with heavy metal ions to generate precipitates, the sludge treatment unit is used for treating the precipitates and sludge generated in the reaction sedimentation tank and refluxing the wastewater generated by treating the precipitates and sludge to the pretreatment unit, and the post-treatment unit is used for adjusting the wastewater to be neutral;
the adsorption unit comprises a heavy metal adsorption device and an adsorption material regeneration device, the first backflow pipe is connected between the adsorption material regeneration device and the pretreatment unit, and the heavy metal adsorption device is connected with the post-treatment unit.
In the above technical scheme, the pretreatment unit comprises a grid and an adjusting tank which are connected in sequence.
In the above technical solution, the sludge treatment unit includes a sludge concentration tank and a sludge dewatering device, and the second return pipe is connected between the adjusting tank and the sludge concentration tank.
In the technical scheme, the post-treatment unit comprises a neutralization pond and a stabilization pond, and aquatic plants for adsorbing heavy metal ions are planted in the stabilization pond.
In the technical scheme, a plurality of dosing nozzles are distributed in the reaction sedimentation tank, and a submersible stirrer is arranged in the tank.
In the technical scheme, a sludge conveying pipeline is connected between the adjusting tank and the sludge treatment unit.
In the above technical scheme, the heavy metal adsorption device contains an activated carbon adsorption material.
In the above technical solution, the first return pipe is connected between the adsorbing material regenerating device and the regulating tank.
Compared with the prior art, the method has the beneficial effects that (1) the precipitation method and the activated carbon adsorption method are combined for treatment, so that heavy metal ions in the wastewater can be completely removed; (2) the mode of wastewater backflow of a sludge treatment unit and desorption liquid treatment backflow is adopted, so that new 'three wastes' cannot be generated in the wastewater treatment project; (3) the regeneration times of the activated carbon are reduced, and the cost is saved; (4) the adsorbed heavy metal can be enriched, and the recycling of the heavy metal is facilitated.
Drawings
FIG. 1 is a system diagram according to an embodiment;
FIG. 2 is a diagram of an adsorption unit of the embodiment;
the system comprises a pretreatment unit 1, a reaction sedimentation tank 2, an adsorption unit 3, a post-treatment unit 4, a sludge treatment unit 5, a first return pipe 6, a second return pipe 7, a sludge conveying channel 8, a grid 101, a regulation tank 102, a heavy metal adsorption device 301, an adsorption material regeneration device 302, a neutralization tank 401, a stabilization pond 402, a sludge concentration pond 501 and a sludge dewatering device 502.
Detailed Description
The technical solution of the present invention is further explained with reference to the drawings and the embodiments.
Example one
An industrial heavy metal sewage treatment system comprises a pretreatment unit 1, a reaction sedimentation tank 2, an adsorption unit 3, a post-treatment unit 4 and a sludge treatment unit 5 connected with the reaction sedimentation tank 2, which are connected in sequence;
the pretreatment unit 1 comprises a grating 101 and a regulating tank 102 which are connected in sequence;
the sludge treatment unit 5 comprises a sludge concentration tank 501 and a sludge dewatering device 502, the adjusting tank 102 and the sludge concentration tank 501 are connected with a sludge conveying pipeline 8, solid residues generated in industrial production are removed by the grid tank 101, the adjusting tank 102 adjusts the quality of balanced water quality and is connected with the sludge concentration tank 501, fine residues isolated by the adjusting tank 102 are discharged to the sludge concentration tank 501, a second return pipe 7 is connected between the sludge concentration tank 501 and the adjusting tank 102, and wastewater treated by the sludge concentration tank flows back to the adjusting tank 102 through the second return pipe 7.
A plurality of dosing nozzles are distributed in the reaction sedimentation tank 2, a submersible stirrer is arranged in the tank, the dosing nozzles are used for adding alkaline substances such as sodium hydroxide and the like to generate sediments, the medicines of the stirrer and the wastewater are fully reflected, after a preset pH value is reached, the stirrer is stood to fully precipitate hydroxide sediments, the sediments enter a sludge concentration tank 501, and liquid enters an adsorption unit 3;
The post-treatment unit 4 comprises a neutralization pond 401 and a stabilization pond 402, wherein the neutralization pond 401 is used for adjusting the wastewater to be neutral and then discharging the wastewater to the stabilization pond 402, and aquatic plants for adsorbing heavy metal ions are planted in the stabilization pond 402 to adsorb the residual heavy metal.
The invention combines the precipitation method and the activated carbon adsorption method, the two methods complement each other, the activated carbon is used for adsorbing heavy metal ions which cannot be completely removed in the precipitation, the activated carbon adsorbs a small amount of heavy metal ions and precipitation residues, the problem of high cost caused by easy saturation of adsorption due to single adsorption and continuous regeneration of the activated carbon is solved, the washing waste liquid generated by desorption is refluxed and collected to the regulating tank, the adsorbed heavy metals can be enriched and reused, and the generation of new three wastes is also avoided.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (8)
1. The industrial heavy metal sewage treatment system is characterized by comprising a pretreatment unit, a reaction sedimentation tank, an adsorption unit, a post-treatment unit and a sludge treatment unit connected with the reaction sedimentation tank which are sequentially connected, wherein a first return pipe is connected between the adsorption unit and the pretreatment unit, and a second return pipe is connected between the sludge treatment unit and the pretreatment unit;
the pretreatment unit is used for primarily adjusting water quality, the reaction sedimentation tank is used for adjusting the pH value of wastewater to be alkaline and reacting with heavy metal ions to generate precipitates, the sludge treatment unit is used for treating the precipitates and sludge generated in the reaction sedimentation tank and refluxing the wastewater generated by treating the precipitates and sludge to the pretreatment unit, and the post-treatment unit is used for adjusting the wastewater to be neutral;
the adsorption unit comprises a heavy metal adsorption device and an adsorption material regeneration device, the first backflow pipe is connected between the adsorption material regeneration device and the pretreatment unit, and the heavy metal adsorption device is connected with the post-treatment unit.
2. The industrial heavy metal sewage treatment system of claim 1, wherein the pretreatment unit comprises a grid and a regulating tank which are connected in sequence.
3. The industrial heavy metal sewage treatment system of claim 2, wherein the sludge treatment unit comprises a sludge concentration tank and a sludge dewatering device, and the second return pipe is connected between the regulating tank and the sludge concentration tank.
4. The industrial heavy metal sewage treatment system of claim 1, wherein the post-treatment unit comprises a neutralization pond and a stabilization pond, and aquatic plants for adsorbing heavy metal ions are planted in the stabilization pond.
5. The industrial heavy metal sewage treatment system of claim 1, wherein a plurality of dosing nozzles are distributed in the reaction sedimentation tank, and a submersible mixer is arranged in the tank.
6. The industrial heavy metal sewage treatment system of claim 2, wherein a sludge transport pipeline is connected between the regulating pond and the sludge treatment unit.
7. The industrial heavy metal sewage treatment system of claim 1, wherein the heavy metal adsorption device comprises an activated carbon adsorption material.
8. The industrial heavy metal sewage treatment system of claim 2 wherein the first return line is connected between the adsorbent material regeneration device and the conditioning tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911237363.6A CN112919667A (en) | 2019-12-06 | 2019-12-06 | Industrial heavy metal sewage treatment system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911237363.6A CN112919667A (en) | 2019-12-06 | 2019-12-06 | Industrial heavy metal sewage treatment system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112919667A true CN112919667A (en) | 2021-06-08 |
Family
ID=76161088
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911237363.6A Withdrawn CN112919667A (en) | 2019-12-06 | 2019-12-06 | Industrial heavy metal sewage treatment system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112919667A (en) |
-
2019
- 2019-12-06 CN CN201911237363.6A patent/CN112919667A/en not_active Withdrawn
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Legal Events
| Date | Code | Title | Description |
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| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20210608 |