CN219010080U

CN219010080U - Stainless steel pipe pickling heavy metal wastewater's processing system

Info

Publication number: CN219010080U
Application number: CN202222705980.8U
Authority: CN
Inventors: 陈泽民; 常春; 翟丽丽; 蒋磊; 高虹
Original assignee: JIANGSU WUJIN STAINLESS STEEL PIPE GROUP CO Ltd
Current assignee: JIANGSU WUJIN STAINLESS STEEL PIPE GROUP CO Ltd
Priority date: 2022-10-14
Filing date: 2022-10-14
Publication date: 2023-05-12
Anticipated expiration: 2032-10-14

Abstract

The utility model discloses a treatment system for stainless steel pipe pickling heavy metal wastewater, which comprises an acid storage tank storing pickling heavy metal wastewater, wherein the acid storage tank is connected with a neutralization tank, a precise filter and an ion exchange adsorber are sequentially connected between a water outlet of a waste liquid tank and a water inlet of a waste acid primary sedimentation tank, a micro-electrolysis reactor, a metal catcher and an ultra-micro separator are sequentially connected to a water outlet of the waste acid primary sedimentation tank, an outlet end of the ultra-micro separator is connected with an adjusting tank group, a non-metal sedimentation tank is connected to the lower part of the adjusting tank group, and a heavy metal sedimentation tank is connected to the lower part of the waste acid primary sedimentation tank. Through the mode, the treatment system for the stainless steel pipe pickling heavy metal wastewater can separate the heavy metal ions and the non-heavy metal ions in the pickling wastewater, effectively improve the purity of the precipitate of the heavy metal ions and the non-heavy metal ions, and the treated wastewater exceeds the discharge standard.

Description

Stainless steel pipe pickling heavy metal wastewater's processing system

Technical Field

The utility model relates to the field of wastewater treatment, in particular to a treatment system for stainless steel pipe pickling heavy metal wastewater.

Background

In the production of stainless steel, in order to remove scale on the surface of annealed steel, surface cleaning is generally performed by using a mixed acid composed of nitric acid and hydrofluoric acid, which is called pickling. With the development of the steel industry and the surface treatment industry, the annual production of pickling waste liquid and over one million cubic meters are remarkable in pollution hazard. The main hazard of the acid-containing wastewater is that the acid-containing wastewater corrodes hydraulic structures such as sewer pipes, reinforced concrete and the like, and the acid-containing wastewater permeates soil, so that the soil is calcified and the loose state of a soil layer is destroyed after a long time, thereby influencing the growth of crops; when the acid-containing wastewater is discharged into a water body, the living conditions of fishes, self-purifying microorganisms participating in self-purification of the water and the like are destroyed due to oxygen deprivation from the water, so that the fishes die; the pickling waste water contains heavy metal substances such as chromium, and excessive chromium has cancerogenic action on human bodies.

The traditional pickling wastewater is generally treated by adopting a lime neutralization and precipitation method, and the treatment process is difficult to realize a good precipitation effect on nonmetallic elements contained in the wastewater.

Disclosure of Invention

The utility model mainly solves the technical problem of providing a treatment system for stainless steel pipe pickling heavy metal wastewater, which can separate the heavy metal ions and non-heavy metal ions in the pickling wastewater, effectively improve the purity of the precipitate of the heavy metal ions and the non-heavy metal ions, and the treated wastewater exceeds the discharge standard.

In order to solve the technical problems, the utility model adopts a technical scheme that: the utility model provides a stainless steel pipe pickling heavy metal wastewater's processing system, including the waste liquid pond that has pickling heavy metal wastewater, the waste liquid pond is connected with the neutralization pond, precision filter and ion exchanger have been connected gradually between the delivery port of waste liquid pond and the water inlet in waste acid primary sedimentation pond, little electrolytic reactor, metal trap and super micro separator have been connected gradually on the waste acid primary sedimentation pond delivery port, super micro separator's exit end is connected with multistage equalizing basin, the below in multistage equalizing basin is connected with the concentrated pond of nonmetal, the below in waste acid primary sedimentation pond is connected with the concentrated pond of heavy metal.

In a preferred embodiment of the utility model, the neutralization tank is connected to a sodium hydroxide solution reservoir which feeds the sodium hydroxide solution from the inside into the neutralization tank.

In a preferred embodiment of the utility model, the multistage regulating tank is formed by sequentially connecting at least two regulating tanks, and the lower part of the regulating tank is communicated with the non-heavy metal concentration tank.

In a preferred embodiment of the utility model, the regulating tank at least comprises a sodium salt-containing wastewater regulating tank, a fluoride-containing wastewater regulating tank and a phosphorus-containing wastewater regulating tank, and sediment waste at the bottom of the regulating tank is deposited and precipitated in a nonmetallic concentration tank.

In a preferred embodiment of the utility model, the water outlet of the regulating reservoir is connected with an activated carbon filter.

In a preferred embodiment of the utility model, the ion exchanger is further connected to a membrane system assembly comprising a microfiltration membrane and a reverse osmosis membrane connected to the low pressure side water outlet of the microfiltration membrane.

In a preferred embodiment of the present utility model, the precision filter is provided with a folding microporous membrane filter element, and the filtering precision of the folding microporous membrane filter element is 2-5 μm.

In a preferred embodiment of the utility model, the ion exchanger is internally provided with chelating resin as an exchange adsorption main body.

The beneficial effects of the utility model are as follows: according to the treatment system for the stainless steel pipe pickling heavy metal wastewater, the heavy metal ions are primarily treated after neutralization, filtration and ion exchange of the wastewater acid liquor, and finally the heavy metal ions are treated and precipitated in the waste acid primary sedimentation tank.

The beneficial effects of the utility model are as follows: according to the treatment system for the stainless steel pipe pickling heavy metal wastewater, the wastewater deposited with heavy metal ions is subjected to micro-electrolysis reaction, metal capturing and ultra-micro separation, so that the heavy metal ions remained in the wastewater are further removed, and the content of the heavy metal ions in the wastewater subjected to subsequent non-heavy metal ion treatment is ensured to be extremely low.

The beneficial effects of the utility model are as follows: according to the treatment system for the stainless steel pipe pickling heavy metal wastewater, disclosed by the utility model, the non-metal ions are treated step by step through the multi-stage regulating tanks, so that the content of the non-metal ions in the treated wastewater is ensured to reach the emission standard.

Drawings

For a clearer description of the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the description below are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art, wherein:

FIG. 1 is a schematic diagram of a treatment system for pickling heavy metal wastewater in stainless steel pipes according to a preferred embodiment of the utility model;

the components in the drawings are marked as follows: 1. the device comprises a waste liquid tank, 2, a neutralization tank, 3, a precision filter, 4, an ion exchanger, 5, a waste acid primary sedimentation tank, 6, a micro-electrolysis reactor, 7, a metal catcher, 8, an ultra-micro separator, 9, a multi-stage regulating tank, 10, a non-heavy metal concentration tank, 12, a heavy metal concentration tank, 11, a membrane system device, 12 and an active carbon filter.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below. The structures, proportions, sizes, etc. shown in the drawings are shown only in connection with the present disclosure, and are not intended to limit the scope of the utility model, since any modification, variation in proportions, or adjustment of the size, etc. of the structures, proportions, etc. should be considered as falling within the spirit and scope of the utility model, without affecting the effect or achievement of the objective. Also, the terms "upper", "lower", "left", "right", "middle", and the like are used herein for descriptive purposes only and are not intended to limit the scope of the utility model for modification or adjustment of the relative relationships thereof, as they are also considered within the scope of the utility model without substantial modification to the technical context.

Referring to fig. 1, a treatment system for stainless steel pipe pickling heavy metal wastewater is disclosed, wherein the wastewater generated after stainless steel pipe pickling is intensively discharged into a waste liquid pool 1, and the uniform quantity is homogenized in the waste liquid pool 1. After standing for a period of time, the sodium hydroxide solution in the neutralization tank 2 is sent into the waste liquid tank 1 for neutralization reaction, and the pH value of the waste water is adjusted to be neutral. The neutralization tank 2 is connected with a sodium hydroxide solution storage tank, and the sodium hydroxide solution storage tank sends the sodium hydroxide solution in the neutralization tank 2.

After the waste liquid in the waste liquid tank 1 is neutralized, the waste liquid tank 1 starts to convey the waste liquid to the waste acid primary sedimentation tank 5. The waste liquid needs to pass through the precision filter 3 and the ion exchanger 4 and then enters the waste acid primary sedimentation tank 5. The precision filter 3 is provided with a folding microporous membrane filter core, and the filtering precision of the folding microporous membrane filter core is 2-5 mu m. The wastewater is precisely filtered by the precise filter 3, and some solid impurities remained in the wastewater are filtered, so that the subsequent treatment is convenient. The filtered waste water is treated again by an ion exchanger 4, and chelating resin is used as an exchange adsorption main body in the ion exchanger. The mechanism of chelating resin adsorption of metal ions is that functional atoms on the resin undergo coordination reaction with the metal ions to form a stable structure similar to a small molecule chelate, so that a part of metal ions are adsorbed. The wastewater after the precise filtration and ion adsorption is discharged into the waste acid primary sedimentation tank 5 again.

A part of the waste liquid containing heavy metals generated by the ion exchanger 4 is discharged again to the membrane system device 11. The membrane system device 11 comprises a microfiltration membrane and a reverse osmosis membrane connected to a water outlet on the low pressure side of the microfiltration membrane. And a small amount of concentrated water generated after the reverse osmosis membrane unit treatment is returned to the micro-filtration membrane for treatment again; a small amount of concentrated water generated by the wastewater through the microfiltration membrane treatment enters a wastewater tank.

The upper part of the liquid of the waste water of the waste acid primary sedimentation tank 5 acts with a precipitator, clear liquid is discharged after a certain time of precipitation, the turbid liquid of the sediment of the lower part is discharged to the heavy metal concentration tank 12, and the heavy metal mixture can be obtained after the treatment and the press filtration in the heavy metal concentration tank 12.

The clear liquid after precipitation passes through a micro-electrolysis reactor 6, a metal catcher 7 and an ultra-micro separator 9 in sequence and then enters a multi-stage regulating tank. The micro-electrolysis reactor 6 is characterized in that numerous tiny primary batteries are formed by utilizing potential difference between iron and carbon particles, the tiny batteries take iron with low potential as an anode and carbon with high potential as a cathode, electrochemical reaction is carried out in aqueous solution containing acid electrolyte, as a result of the reaction, iron is corroded to become bivalent iron ions, the bivalent iron ions enter the solution, the pH value of effluent water of the internal electrolysis reactor is regulated to about 9, ferrous hydroxide with a coagulation effect is formed due to the action of the iron ions and hydroxide, the ferrous hydroxide and particles with weak negative charges in pollutants are absorbed in opposite directions, relatively stable flocculates (also called iron mud) are formed and removed, and a certain proportion of copper powder or lead powder is added into an iron bed and a carbon bed to promote the release of the iron ions in order to increase the potential difference. The heavy metal catcher 7 can convert all metal pollutants into sediment, then the sediment passes through the ultra-micro separator 9 equipment, the ultra-micro separator 9 equipment has higher metal particle separation efficiency, meanwhile, the ultra-micro separator 9 has concentration effect, a concentration tank is not needed to be arranged again to separate the sediment from clear liquid, the sediment is concentrated in a separator, after dehydration and drying, the solid content reaches more than 90 percent, and the sediment can enter a blast furnace for recycling or can be recycled by other methods. The ultra-micro separator 9 (also called vibrating membrane separator) performs material separation by an organic membrane, separates and concentrates metal sludge from water, and simultaneously the membrane can vibrate reciprocally at high frequency by a special mechanical device, the vibration frequency is between 40 and 50Hz, and the vibration amplitude is between 10 and 20 mm. After the treatment, the metal ion residues in the wastewater can be further reduced.

The multistage regulating tanks at least comprise a sodium salt-containing wastewater regulating tank, a fluoride-containing wastewater regulating tank and a phosphorus-containing wastewater regulating tank, wherein in each regulating tank, substances such as a proper precipitator, a flocculating agent or a regulating agent are selected for reaction according to the types of nonmetallic ions contained in wastewater, residual clear liquid is sent to an activated carbon filter 12 for filtration and then reaches the discharge standard, and sediment is sent to a non-heavy metal concentration tank 10 for recovery treatment.

Compared with the prior art, the treatment system of the stainless steel pipe pickling heavy metal wastewater disclosed by the utility model has the advantages that on the basis of the existing filtering treatment equipment, the heavy metal ions and the non-heavy metal ions in the pickling wastewater can be separately treated by readjusting the wastewater treatment step, so that the purity of the precipitate of the heavy metal ions and the non-heavy metal ions is effectively improved, and the treated wastewater exceeds the discharge standard.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims

1. The utility model provides a stainless steel pipe pickling heavy metal wastewater's processing system, its characterized in that, including the waste liquid pond that has pickling heavy metal wastewater, the waste liquid pond is connected with the neutralization pond, precision filter and ion exchanger have been connected gradually between the delivery port of waste liquid pond and the water inlet of waste acid primary sedimentation tank, micro-electrolysis reactor, metal catcher and super micro-separator have been connected gradually on the waste acid primary sedimentation tank delivery port, the exit end of super micro-separator is connected with multistage equalizing basin, the below of multistage equalizing basin is connected with non-heavy metal concentration pond, the below of waste acid primary sedimentation tank is connected with heavy metal concentration pond.

2. The system for treating stainless steel pipe pickling heavy metal wastewater according to claim 1, wherein the neutralization tank is connected with a sodium hydroxide solution storage tank, and the sodium hydroxide solution storage tank sends the internal sodium hydroxide solution into the neutralization tank.

3. The treatment system of stainless steel pipe pickling heavy metal wastewater according to claim 1, wherein the multistage regulating tank is formed by sequentially connecting at least two regulating tanks, and the lower part of the regulating tank is communicated with a non-heavy metal concentration tank.

4. A system for treating stainless steel pipe pickling heavy metal wastewater according to claim 3, wherein the regulating tank at least comprises a sodium salt-containing wastewater regulating tank, a fluoride-containing wastewater regulating tank and a phosphorus-containing wastewater regulating tank, and sediment waste at the bottom of the regulating tank is deposited and precipitated in a non-heavy metal concentration tank.

5. The system for treating stainless steel pipe pickling heavy metal wastewater according to claim 4, wherein the water outlet of the regulating tank is connected with an activated carbon filter.

6. The system for treating stainless steel pipe pickling heavy metal wastewater according to any one of claims 1 to 5, wherein the ion exchanger is further connected with a membrane system device, and the membrane system device comprises a microfiltration membrane and a reverse osmosis membrane connected to a water outlet on a low pressure side of the microfiltration membrane.

7. The treatment system for stainless steel pipe pickling heavy metal wastewater according to claim 6, wherein a folding microporous membrane filter element is arranged in the precision filter, and the filtering precision of the folding microporous membrane filter element is 2-5 μm.

8. The system for treating wastewater from pickling heavy metals in stainless steel pipe according to claim 6, wherein chelating resin is used as the main body of the ion exchanger.