CN218321019U - Arsenic-containing wastewater treatment equipment - Google Patents
Arsenic-containing wastewater treatment equipment Download PDFInfo
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- CN218321019U CN218321019U CN202221477670.9U CN202221477670U CN218321019U CN 218321019 U CN218321019 U CN 218321019U CN 202221477670 U CN202221477670 U CN 202221477670U CN 218321019 U CN218321019 U CN 218321019U
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Abstract
The utility model relates to arsenic-containing wastewater treatment equipment, which comprises a coagulating sedimentation unit and an advanced treatment unit; the advanced treatment unit comprises a softening tank, an ultrafiltration module, a reverse osmosis module and a water production tank which are connected in sequence; the water inlet of the softening tank is connected with the water outlet of the coagulating sedimentation unit, and the water outlet of the softening tank is connected with the water inlet of the ultrafiltration module; a water production port of the ultrafiltration module is connected to a water inlet of the reverse osmosis module, and a water production port of the reverse osmosis module is connected to the water production pool; and the concentrated water port of the ultrafiltration module and the concentrated water port of the reverse osmosis module are both connected to the water inlet of the ultrafiltration module. The utility model discloses through the mode that physics and chemistry combined together, reduce the arsenic content in the waste water effectively, change a large amount of highly toxic waste water into can recycle's industrial water, really realize waste water resource recovery and utilization.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to the technical field of industrial wastewater treatment equipment, in particular to arsenic-containing wastewater treatment equipment.
[ background of the invention ]
In the production and processing process of the new semiconductor material, industrial wastewater containing arsenic (As) is produced. Most of the conventional treatment methods are to discharge arsenic-containing wastewater after coagulating sedimentation, and the method has the defects that the content of As in terminal drainage is unstable, and the concentration of arsenic is easy to exceed the standard. With the enhancement of national environmental protection, heavy metals and metalloids (As) are changed into heavy-point pollution source control, and the approval of new construction and expansion for increasing heavy metal pollutant emission is forbidden. However, at present, many semiconductor manufacturing enterprises still cannot treat arsenic-containing wastewater efficiently, and the As content in the discharged water is often unstable. And the terminal drainage under the conventional treatment, although reaching the emission standard, has the long-term influence of the As content on the environment.
Therefore, in order to solve the above technical problems, there is a need to provide an arsenic wastewater treatment device to overcome the above-mentioned drawbacks of the prior art.
[ Utility model ] content
An object of the utility model is to provide an arsenic wastewater treatment equipment can handle arsenic waste water safely high-efficiently, reaches "industrial water standard (GB-8978-1996)" standard, makes the waste water after handling can continue cyclic utilization, realizes arsenic waste water zero discharge.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
an arsenic-containing wastewater treatment device comprises a coagulating sedimentation unit and an advanced treatment unit;
the advanced treatment unit comprises a softening tank, an ultrafiltration module, a reverse osmosis module and a water production tank which are connected in sequence; the water inlet of the softening tank is connected with the water outlet of the coagulating sedimentation unit, and the water outlet of the softening tank is connected with the water inlet of the ultrafiltration module; a water production port of the ultrafiltration module is connected to a water inlet of the reverse osmosis module, and a water production port of the reverse osmosis module is connected to the water production pool; and the concentrated water port of the ultrafiltration module and the concentrated water port of the reverse osmosis module are both connected to the water inlet of the ultrafiltration module.
Optionally, the depth processing unit further comprises a filter; the coagulating sedimentation unit is connected with a water inlet of the filter, and a water outlet of the filter is connected with the softening tank.
Optionally, the advanced treatment unit further comprises a treatment water tank; the water outlet of the softening tank is connected to the water inlet of the treatment water tank, and the treatment water tank is connected with the water inlet of the ultrafiltration module; and the concentrated water port of the ultrafiltration module and the concentrated water port of the reverse osmosis module are both connected to the treatment water tank.
Optionally, the ultrafiltration module employs a hollow fiber ultrafiltration membrane.
Optionally, the reverse osmosis module comprises a first reverse osmosis membrane and a second reverse osmosis membrane, a water production port in the ultrafiltration module sequentially passes through the first reverse osmosis membrane and the second reverse osmosis membrane and is connected to the water production tank, and a concentrated water port of the first reverse osmosis membrane and a concentrated water port of the second reverse osmosis membrane are connected to the water treatment tank.
Optionally, the reverse osmosis module further comprises a third reverse osmosis membrane and a fourth reverse osmosis membrane; the concentrated mouth of a river of one-level reverse osmosis membrane is connected to the water inlet of tertiary reverse osmosis membrane, the delivery port of tertiary reverse osmosis membrane is connected to the water inlet of secondary reverse osmosis membrane, the concentrated mouth of a river of tertiary reverse osmosis membrane is connected the water inlet of level four reverse osmosis membrane, the delivery port of level four reverse osmosis membrane is connected to in the treatment pond, evaporative condenser is connected to the concentrated mouth of a river of level four reverse osmosis membrane, evaporative condenser exit linkage produces the export of pond.
Optionally, the first-stage reverse osmosis membrane, the second-stage reverse osmosis membrane and the third-stage reverse osmosis membrane all adopt brackish water membranes, and the fourth-stage reverse osmosis membrane is a sea-fresh membrane.
Optionally, the produced water of the produced water tank is supplied to a cooling tower system, an arsenic-containing process system or an emergency system via a pump.
Optionally, the coagulating sedimentation unit comprises a raw water pool, a reaction tank, a flocculation tank and a dehydrator which are connected in sequence; the delivery port in former pond is connected the water inlet of reaction tank, the delivery port of reaction tank is connected the water inlet of flocculation basin, the delivery port of flocculation basin is connected the water inlet of sedimentation tank, the delivery port of sedimentation tank is connected degree of depth processing unit, the deposit exit linkage hydroextractor of sedimentation tank.
Optionally, the reaction tank comprises a first reaction tank and a second reaction tank which are connected in sequence, and the first reaction tank and the second reaction tank are respectively provided with a feeding inlet.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses earlier handle arsenic-containing waste water through coagulating sedimentation unit earlier, reentrant advanced treatment unit carries out degree of depth ultrafiltration, reverse osmosis, evaporation, and it is further concentrated to contain arsenic clarified liquid, through the mode that physics and chemistry combined together, reduces the arsenic content in the waste water effectively, changes the waste water of a large amount of hypertoxic into can the used industrial water that recycles, really realizes waste water resource recovery and utilization.
Additionally, the utility model discloses in the reverse osmosis module of adoption be multistage reverse osmosis, can deepen and remove arsenic, the dense water that simultaneously reverse osmosis evaporates after the light membrane of sea, and the remaining zero release that reaches of arsenic after the evaporation basically. The return water of the ultrafiltration module and the reverse osmosis module flows back to the treatment water tank for continuous retreatment, and the whole treatment line forms closed loop flow to achieve dynamic balance.
[ description of the drawings ]
Fig. 1 is a schematic diagram of a preferred embodiment of the present invention.
[ detailed description ] embodiments
Please refer to fig. 1 of the specification, the technical solution of the present invention will be further explained in detail.
In the embodiment, two major units are involved, namely a coagulating sedimentation unit 1 and an advanced treatment unit 2. In the coagulating sedimentation unit 1, raw water of arsenic-containing wastewater is firstly treated, and a medicament is added to carry out flocculating sedimentation in a chemical mode to obtain arsenic slag and arsenic-containing clear liquid. The advanced treatment unit 2 mainly utilizes a physical mode to carry out softening, ultrafiltration, reverse osmosis and evaporation, and advanced treatment is carried out on the arsenic-containing clear liquid in the coagulating sedimentation unit 1 to obtain the really recyclable water.
The coagulation sedimentation unit 1 in this embodiment includes a raw water tank 11, a PH adjustment tank 12, a first reaction tank 13, a second reaction tank 14, a flocculation tank 15, a sedimentation tank 16, and a primary water tank 17, which are connected in sequence. The water outlet of the raw water tank 11 is connected to the water inlet of the PH adjusting tank 12, the water outlet of the PH adjusting tank 12 is connected to the water inlet of the first reaction tank 13, the water outlet of the water inlet of the first reaction tank 13 is connected to the second reaction tank 14, the water outlet of the second reaction tank 14 is connected to the water inlet of the flocculation tank 15, the water outlet of the flocculation tank 15 is connected to the water inlet of the sedimentation tank 16, the water outlet of the sedimentation tank 16 is connected to the primary water tank 17, and the sediment outlet of the sedimentation tank 16 is connected to the dehydrator 18. The arsenic-containing wastewater sequentially flows through the above links, and finally a primary arsenic-containing clarified liquid is obtained in the primary water pool 17.
The raw water tank 11 is a buffer tank for allowing arsenic-containing wastewater formed in an industrial production link to enter the coagulating sedimentation unit 1, water in the raw water tank 11 is pumped to the pH adjusting tank 12 through the first water pump 31, the pH value of the water is adjusted in the pH adjusting tank 12 by adopting an acid/alkali neutralizer, and then the water flows to the first reaction tank 13.
The first reaction tank 13 and the second reaction tank 14 are mainly used for carrying out pre-oxidation and then adding an additive containing metal ions, and reacting arsenic ions in the arsenic-containing wastewater to obtain metal precipitates. Specifically, firstly, an oxidant is added into a reaction tank to pre-oxidize the arsenic-containing wastewater so As to oxidize As ions into AsO which is easier to form precipitates 4 3- (ii) a Adding metal ions M + With AsO in the waste water 4 3- The reaction is carried out to form M with very low solubility x (AsO 4 ) y Precipitating; in the embodiment, two reaction tanks are adopted, each reaction tank is provided with a feeding inlet, and different metal additives can be added into different feeding ports or can be mixed and added, so that the oxidized metal additives and metal ions are combined and precipitated. The number of the reaction tanks can be increased or decreased according to the content of the arsenic-containing wastewater, so that the arsenic content or other harmful substances in the raw water can be fully combined and precipitated.
The water treated by the first reaction tank 13 and the second reaction tank 14 flows into the flocculation tank 15, a flocculating agent is put into the flocculation tank 15 for flocculation reaction, and then the water flows into the sedimentation tank 16 for sedimentation. The arsenic slag is separated by the sedimentation tank 16, the sediment of the arsenic slag is introduced into the dehydrator 18 to be dehydrated to form residue for recycling treatment, the produced water of the sedimentation tank 16 enters the primary water tank 17 to be cached, and the produced water obtained by the primary water tank 17 is the arsenic-containing clear liquid containing a small amount of arsenic ions, wherein the content of As is 1-10 mg/L.
The clarified liquor containing arsenic is pumped to the advanced treatment unit 2 by a second water pump 32. The advanced treatment unit 2 in this embodiment comprises a filter 21, a softening tank 22, a treatment water tank 23, an ultrafiltration module 24, a reverse osmosis module 25, an evaporative condenser 26 and a water production tank 27. The water outlet of the filter 21 is connected to the water inlet of the softening tank, the water outlet of the softening tank 22 is connected with the water inlet of the ultrafiltration module 24, the water outlet of the ultrafiltration module 24 is connected to the water inlet of the reverse osmosis module 25, the water outlet of the reverse osmosis module 25 is connected to the water production tank 27, and the concentrated water inlet of the ultrafiltration module 24 and the concentrated water inlet of the reverse osmosis module 25 are both connected to the water treatment tank 23 at the water inlet front end of the ultrafiltration module 24.
The filter 21 filters the arsenic-containing clear liquid introduced from the previous stage by multi-medium filtration, wherein the raw material can be pebbles, quartz sand, activated carbon and the like, and the filter layers with different particle diameters are used for filtering and removing the particulate matters which are not precipitated and are in a suspended state.
The filtered water enters the softening tank 22 for softening. Here, a resin ion exchanger is added, passing H in the resin ion exchanger + Ions andm in waste water + And the metal ions are exchanged and then removed, a rear-end membrane system is protected, the metal ions are prevented from damaging an ultrafiltration module 24 and a reverse osmosis module 25 in a subsequent procedure, the influence of the metal ions on various membranes is reduced, and ultrafiltration and reverse osmosis can be smoothly performed.
The softened produced water enters a processing water tank 23 for buffering and is pumped into an ultrafiltration module 24 through a third water pump. In the embodiment, the ultrafiltration module 24 is a hollow fiber ultrafiltration membrane (UF ultrafiltration membrane), and further removes particles with a filtration particle size of more than 50nm, and protects the post-reverse osmosis module 25. Meanwhile, the concentrated water of the ultrafiltration module 24 flows back to the treatment water tank 23 at the front end, and the produced water of the ultrafiltration module 24 enters the next link.
The reverse osmosis module 25 in this embodiment includes a first reverse osmosis membrane 251, a second reverse osmosis membrane 252, a third reverse osmosis membrane 253, and a fourth reverse osmosis membrane 254. The first-stage reverse osmosis membrane 251 and the second-stage reverse osmosis membrane 252 are sequentially connected, the water production ratio can be improved through two-stage connection, and the rejection rate of As and salt substances after metal ion oxidation is controlled to be 90-99%. Simultaneously, the metal ions M in the first reaction tank 13 and the second reaction tank 14 are introduced + With AsO in the waste water 4 3- The reaction is carried out to form salt substances, and the salt substances are fully trapped. Of course, the number of reverse osmosis membrane stages can be increased or decreased according to actual conditions. In this embodiment, the produced water of the first reverse osmosis membrane 251 enters the second reverse osmosis membrane 252, and the produced water of the second reverse osmosis membrane 252 enters the water production tank 27. The concentrated water of the secondary reverse osmosis membrane 252 is circulated and introduced into the treatment water tank 23, and ultrafiltration and reverse osmosis can be further carried out. The concentrate of the first reverse osmosis membrane 251 is subjected to reverse osmosis in the present embodiment by the third reverse osmosis membrane 253. The produced water of the third reverse osmosis membrane 253 is introduced into the second reverse osmosis membrane 252, the produced water of the same reverse osmosis membrane 251 is mixed for the second reverse osmosis, the concentrated water of the third reverse osmosis membrane 253 is further introduced into the fourth reverse osmosis membrane 254 for the reverse osmosis, and the produced water after the fourth reverse osmosis circularly flows back to the treatment water tank 23 to wait for the treatment of the second ultrafiltration and the reverse osmosis. The concentrated water filtered by the four-stage reverse osmosis membrane 254 is introduced into the evaporative condenser 26, evaporated by heating, and cooledThe condensate is added into the produced water in the water producing pool 27 and is conveyed to an application system of the required circulating water through a fourth-stage water pump 34. The residue in the evaporative condenser 26 is subjected to additional drying treatment, which will not be described further herein. In this embodiment, several systems for circulating water are illustrated, such as a cooling tower system 41, an arsenic-containing process system 42, an emergency system 43, etc., but other systems may be connected.
In the reverse osmosis module 25 of the present embodiment, in order to reduce the operation cost, the first reverse osmosis membrane 251, the second reverse osmosis membrane 252, and the third reverse osmosis membrane 253 adopt brackish water membranes. Along with the increase of the ion concentration of the concentrated water side, particularly Cl in the concentrated water of the four-stage reverse osmosis membrane 254 and SWRO - 、(SO4) 2- The concentration is 10000-50000 mg/L, the salt water reverse osmosis membrane is not suitable, and the SWRO sea-fresh membrane is required to be selected.
The overall working process of the embodiment is as follows:
the arsenic-containing wastewater obtained in the industrial production link enters a raw water tank 11 for caching, flows to a PH adjusting tank 12 through a first water pump 31 to be subjected to acid/alkali adjustment, then flows through a first reaction tank 13 and a second reaction tank 14 in sequence, is combined with metal ion additives in the two reaction tanks, is subjected to flocculation precipitation reaction through a flocculation tank 15 and a sedimentation tank 16, is then subjected to arsenic slag separation to obtain a primary arsenic-containing clear liquid, and is drained to an advanced treatment unit through a second water pump 32. The separated arsenic slag is dewatered by a dewatering machine 18.
The arsenic-containing clear liquid obtained by the last-stage treatment is firstly filtered by a filter 21 through a plurality of media to remove large particles in the arsenic-containing clear liquid. In the softening treatment in the softening tank 22, the main purpose of the softening is to replace the metal ions added in the previous stage by additives (mainly ion exchange resin), thereby protecting each membrane system in the subsequent ultrafiltration and reverse osmosis processes and reducing the damage and destruction of the metal ions to the membrane.
The filtered and softened arsenic-containing clarified liquid is buffered in a treatment water tank 23, and is delivered to an ultrafiltration module 24 formed by UF ultrafiltration membrane by a third water pump 33, and the large particulate matters can be further removed by ultrafiltration. The ultrafiltration water is subjected to the next reverse osmosis step, and the ultrafiltration concentrated water flows back to the front treatment water tank 23.
The reverse osmosis module 25 adopts a multi-stage reverse osmosis membrane group, salt substances after As and metal ions are oxidized can be produced through the water production of the first-stage reverse osmosis membrane 251 and the second-stage reverse osmosis membrane 252, and the rejection rate is controlled to be 90-99%. In order to realize more thorough arsenic removal effect, the concentrated water of the secondary reverse osmosis membrane 252 is returned to the front treatment water tank 23, and ultrafiltration and reverse osmosis can be performed again. The concentrated water of the first reverse osmosis membrane 251 enters the third reverse osmosis membrane 253, and the produced water is mixed with the produced water of the first reverse osmosis membrane 251 and enters the second reverse osmosis membrane 252. The concentrated water of the third reverse osmosis membrane 253 is introduced into the fourth reverse osmosis membrane 254. The ion concentration is very high, the four-stage reverse osmosis membrane 254 adopts SWRO sea fresh membrane to carry out reverse osmosis, the produced water of the four-stage reverse osmosis membrane 254 flows back to the treatment water tank 23, the concentrated water of the four-stage reverse osmosis membrane 254 is heated and evaporated, the evaporated condensate water is close to zero content, and the evaporated condensate water is introduced into the produced water to be recycled to wait for being recycled by other systems.
The utility model provides a treatment facility provides through the required hardware equipment device of chemistry and physical method, has reduced the content of arsenic in the waste water effectively, is transformed into the industrial water that can recycle with a large amount of highly toxic waste water, plays positive effect to environmental protection and safety in production. The whole set of equipment has simple treatment process links, and is particularly suitable for detoxification treatment of arsenic-containing waste liquid in large-scale industrial production.
The above embodiments are merely preferred embodiments of the present disclosure, which are not intended to limit the present disclosure, and any modifications, equivalents, improvements and the like, which are within the spirit and principle of the present disclosure, should be included in the scope of the present disclosure.
Claims (10)
1. An arsenic-containing wastewater treatment device is characterized in that: comprises a coagulating sedimentation unit and an advanced treatment unit;
the advanced treatment unit comprises a softening tank, an ultrafiltration module, a reverse osmosis module and a water production tank which are connected in sequence; the water inlet of the softening tank is connected with the water outlet of the coagulating sedimentation unit, and the water outlet of the softening tank is connected with the water inlet of the ultrafiltration module; a water production port of the ultrafiltration module is connected to a water inlet of the reverse osmosis module, and a water production port of the reverse osmosis module is connected to the water production pool; and the concentrated water port of the ultrafiltration module and the concentrated water port of the reverse osmosis module are both connected to the water inlet of the ultrafiltration module.
2. The apparatus of claim 1, wherein: the depth processing unit further comprises a filter; the coagulating sedimentation unit is connected with a water inlet of the filter, and a water outlet of the filter is connected with the softening tank.
3. The apparatus of claim 1, wherein: the advanced treatment unit also comprises a treatment water pool; the water outlet of the softening tank is connected to the water inlet of the treatment water tank, and the treatment water tank is connected with the water inlet of the ultrafiltration module; and the concentrated water port of the ultrafiltration module and the concentrated water port of the reverse osmosis module are both connected to the treatment water tank.
4. The apparatus of claim 1, wherein: the ultrafiltration module adopts a hollow fiber ultrafiltration membrane.
5. The apparatus of claim 1, wherein: the reverse osmosis module comprises a first-stage reverse osmosis membrane and a second-stage reverse osmosis membrane, a water production port in the ultrafiltration module sequentially passes through the first-stage reverse osmosis membrane and the second-stage reverse osmosis membrane and is connected to the water production tank, and a concentrated water port of the first-stage reverse osmosis membrane and a concentrated water port of the second-stage reverse osmosis membrane are connected to the water treatment tank.
6. The apparatus of claim 5, wherein: the reverse osmosis module also comprises a third reverse osmosis membrane and a fourth reverse osmosis membrane; the concentrated mouth of a river of one-level reverse osmosis membrane is connected to the water inlet of tertiary reverse osmosis membrane, the delivery port of tertiary reverse osmosis membrane is connected to the water inlet of secondary reverse osmosis membrane, the concentrated mouth of a river of tertiary reverse osmosis membrane is connected the water inlet of level four reverse osmosis membrane, the delivery port of level four reverse osmosis membrane is connected to in the treatment pond, evaporative condenser is connected to the concentrated mouth of a river of level four reverse osmosis membrane, evaporative condenser exit linkage produces the export of pond.
7. The arsenic wastewater treatment plant of claim 6, wherein: the first-stage reverse osmosis membrane, the second-stage reverse osmosis membrane and the third-stage reverse osmosis membrane are all brackish water membranes, and the fourth-stage reverse osmosis membrane is a sea-fresh membrane.
8. The apparatus of claim 1, wherein: and the produced water of the water producing pool is supplied to a cooling tower system, an arsenic-containing process system or an emergency system through a pump.
9. The arsenic wastewater treatment plant of claim 1, wherein: the coagulating sedimentation unit comprises a raw water pool, a reaction tank, a flocculation tank and a dehydrator which are connected in sequence; the delivery port in former pond is connected the water inlet of reaction tank, the delivery port of reaction tank is connected the water inlet of flocculation basin, the water inlet of sedimentation tank is connected to the delivery port of flocculation basin, and the delivery port of sedimentation tank is connected degree of depth processing unit, the deposit exit linkage hydroextractor of sedimentation tank.
10. The apparatus of claim 9, wherein: the reaction tank comprises a first reaction tank and a second reaction tank which are connected in sequence, and the first reaction tank and the second reaction tank are respectively provided with a feeding inlet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221477670.9U CN218321019U (en) | 2022-06-14 | 2022-06-14 | Arsenic-containing wastewater treatment equipment |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221477670.9U CN218321019U (en) | 2022-06-14 | 2022-06-14 | Arsenic-containing wastewater treatment equipment |
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| CN218321019U true CN218321019U (en) | 2023-01-17 |
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| CN202221477670.9U Active CN218321019U (en) | 2022-06-14 | 2022-06-14 | Arsenic-containing wastewater treatment equipment |
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