CN216785909U - Low-cost resource utilization system for acidic wastewater - Google Patents
Low-cost resource utilization system for acidic wastewater Download PDFInfo
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- CN216785909U CN216785909U CN202123343882.6U CN202123343882U CN216785909U CN 216785909 U CN216785909 U CN 216785909U CN 202123343882 U CN202123343882 U CN 202123343882U CN 216785909 U CN216785909 U CN 216785909U
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Abstract
The utility model belongs to the field of water treatment, and particularly relates to a low-cost resource utilization system for acidic wastewater, which comprises an acid washing unit, an acid regeneration unit, a pretreatment unit, an electro-adsorption treatment unit and an alkali wastewater treatment unit; a waste acid liquid outlet of the pickling unit is connected with a waste acid liquid inlet of the acid regeneration unit; an acid wastewater outlet of the pickling line is connected with a water inlet of the pretreatment unit, and a water outlet of the pretreatment unit is connected with a water inlet of the electro-adsorption treatment unit; a concentrated water outlet of the electro-adsorption treatment unit is connected with a regenerated acid absorption liquid inlet of the acid regeneration unit, and a produced water outlet of the electro-adsorption treatment unit is connected with a water inlet of the alkali wastewater treatment unit; the regenerated acid outlet of the acid regeneration unit is connected with the acid washing machine set. According to the utility model, the produced water of the electro-adsorption treatment unit is discharged into the alkali wastewater treatment unit for acid-base neutralization reaction, so that the dosage of the acid neutralizer for the alkali wastewater and the dosage of the alkali neutralizer for the acid produced water are reduced, the salt is prevented from increasing, and finally, the quality of the recycled water is better and the cost is low.
Description
Technical Field
The utility model belongs to the technical field of water treatment, and particularly relates to a low-cost resource utilization system for acidic wastewater.
Background
Iron and steel enterprises can generate a large amount of acidic wastewater in the production process, and the acidic wastewater mainly comes from cold rolling, discharge of a silicon steel pickling line and a stainless steel pickling line. The hydrochloric acid waste water discharged by the cold rolling and silicon steel pickling line mainly contains hydrochloric acid, metal ions (Me) and the like, and the mixed acid waste water of the stainless steel pickling line mainly contains mixed acid (nitric acid, hydrofluoric acid), metal ions (Me) and the like.
Hydrochloric acid acidic wastewater is generally neutralized by a lime neutralization sedimentation tank method to neutralize residual acid in the wastewater and generate metal hydroxide precipitated sludge. The method has the advantages of simple process and less equipment investment. The method has the disadvantages that a large amount of lime milk is required to be added, a large amount of precipitated sludge is produced, the chloride ion content of the wastewater cannot be reduced, the hardness of the wastewater is increased, and the wastewater cannot be recycled.
The acid mixed wastewater is generally neutralized by lime, the neutralized wastewater is wastewater with high nitrate nitrogen content, the total nitrogen discharged directly is high and is 20-100 times of the national discharge standard, so that the biological denitrification treatment of the stainless steel acid washing wastewater is added after neutralization in a few domestic stainless steel enterprises such as Zhang hong Kong pump, Guangzhou Onjiang and the like, and the total nitrogen in the wastewater is removed and then recycled or directly discharged to a water body. Because the operation cost of biological denitrification is very high, most domestic stainless steel enterprises still discharge the neutralized wastewater of the stainless steel pickling line to a whole-plant drainage pipe network directly, and the total nitrogen of the effluent produced by the whole-plant is overproof.
In addition, the acid waste water at home and abroad is also treated by mixing with cold rolling alkaline waste water, the process has the advantages of saving the consumption of acid-base neutralizing agents, and the defect that the acid waste water Fe is caused2+The content of the iron ions in the mixed wastewater is up to 1500-.
Disclosure of Invention
In order to overcome the defects in the prior art, the utility model aims to provide a low-cost resource utilization system for acidic wastewater, which can reduce the dosage of an acid neutralizer of the alkaline wastewater and the dosage of an alkali neutralizer of acidic produced water, avoid salt increase, and finally ensure that the quality of the reuse water is better and the cost is low.
In order to achieve the aim, the technical scheme of the utility model is a low-cost resource utilization system for acidic wastewater, which comprises an acid washing machine set, an acid regeneration unit, a pretreatment unit, an electro-adsorption treatment unit and an alkali wastewater treatment unit; a waste acid liquid outlet of the pickling line is connected with a waste acid liquid inlet of the acid regeneration unit through a pipeline; an acid wastewater outlet of the pickling line is connected with a water inlet of the pretreatment unit through a pipeline, and a water outlet of the pretreatment unit is connected with a water inlet of the electro-adsorption treatment unit; a concentrated water outlet of the electro-adsorption treatment unit is connected with a regenerated acid absorption liquid inlet of the acid regeneration unit, a produced water outlet of the electro-adsorption treatment unit is connected with a water inlet of the alkali wastewater treatment unit, and a water outlet of the alkali wastewater treatment unit is connected with a water inlet pipe of a reclaimed water user or a deep user; and a regenerated acid outlet of the acid regeneration unit is connected with the pickling line.
Further, the electric adsorption treatment unit comprises a first middle water tank and a first-level electric adsorption device, the water outlet of the pretreatment unit is connected with the water inlet of the first middle water tank, the water outlet of the first middle water tank is connected with the water inlet of the first-level electric adsorption device, and the concentrated water outlet of the first-level electric adsorption device is connected with the regenerated acid absorption liquid inlet of the acid regeneration unit.
Furthermore, the electric adsorption treatment unit further comprises a second-stage electric adsorption device and a second middle water tank, a water production outlet of the first-stage electric adsorption device is connected with a water inlet of the second-stage electric adsorption device, a water production outlet of the second-stage electric adsorption device is connected with a water inlet of the second middle water tank, and a water outlet of the second middle water tank is connected with a neutralization water inlet of the alkali wastewater treatment unit.
Furthermore, a concentrated water outlet of the secondary electric adsorption device is connected with the first intermediate water tank.
Furthermore, the alkali wastewater treatment unit comprises an alkali wastewater adjusting tank, a neutralization coagulation flocculation tank, an air floatation device, a biochemical device, a second sedimentation tank and a filtering device which are sequentially connected along the wastewater flow direction; the alkali wastewater adjusting tank is connected with an alkali wastewater inlet pipe of the unit, and a water outlet of the intermediate water tank II is connected with the alkali wastewater adjusting tank; and a water filtering outlet of the filtering device is connected with a water inlet pipe of a reclaimed water user or a depth user.
Further, the acid regeneration unit comprises an acid regeneration reaction furnace and an acid regeneration absorption device, a waste acid liquid outlet of the acid washing unit is connected with a waste acid liquid inlet of the acid regeneration reaction furnace through a pipeline, a high-temperature flue gas outlet of the acid regeneration reaction furnace is connected with a high-temperature flue gas inlet of the acid regeneration absorption device, a concentrated water outlet of the primary electric adsorption device is connected with a regenerated acid absorption liquid inlet of the acid regeneration absorption device, and a regenerated acid outlet of the acid regeneration absorption device is connected with the acid washing unit.
Furthermore, the pretreatment unit comprises an acidic wastewater adjusting tank, a first sedimentation tank and an acidic wastewater filter which are sequentially connected in the wastewater flowing direction, an acidic wastewater outlet of the pickling line is connected with a water inlet of the acidic wastewater adjusting tank through a pipeline, and a filtered water outlet of the acidic wastewater filter is connected with a water inlet of the electro-adsorption treatment unit.
Furthermore, the shell of the acidic wastewater filter is made of an acid-resistant material, and the filter material is made of an acid-resistant material.
Compared with the prior art, the utility model has the beneficial effects that:
(1) according to the utility model, the electro-adsorption treatment unit is adopted to adsorb and remove ions in the wastewater, so that the ion concentration of water produced by the electro-adsorption treatment unit is reduced, and the high conductivity and metal ions of the effluent of the acidic wastewater are avoided; concentrated water of the electro-adsorption treatment unit is used as a regenerated acid absorption liquid to spray and absorb high-temperature flue gas containing acidic components generated by high-temperature thermal hydrolysis reaction of the waste acid liquid, the formed regenerated acid is sent back to the pickling unit for recycling, and produced water of the electro-adsorption treatment unit is discharged into the alkali wastewater treatment unit for acid-base neutralization reaction, so that the adding amount of an acid neutralizer of the alkali wastewater and the adding amount of an alkali neutralizer of the acid produced water are reduced, salt increase is avoided, the quality of final recycled water is better, and the operation cost is low;
(2) the utility model reduces the salinity and metal ion concentration of the acidic wastewater by connecting two stages of electric adsorption devices in series, and avoids the influence of high salinity, high hardness and high iron ions of the mixed wastewater on the biochemical treatment effect and the problem that the high iron ions of the biochemical effluent can not be further recycled and treated deeply in the traditional acid-base wastewater mixing treatment process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a low-cost resource utilization system for acidic wastewater according to an embodiment of the present invention;
in the figure: 1. a pickling line; 2. an acid regeneration reaction furnace; 3. an acid regeneration absorption device; 4. an acid wastewater adjusting tank; 5. a first sedimentation tank; 6. an acidic wastewater filter; 7. a first middle water tank; 8. a primary electro-adsorption device; 9. a secondary electro-adsorption device; 10. a second middle water tank; 11. an alkali wastewater adjusting tank; 12. a neutralization, coagulation and flocculation tank; 13. an air floatation device; 14. a biochemical device; 15. a second sedimentation tank; 16. a filtration device; 17. and (4) preparing an acid tank.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, an embodiment of the present invention provides a low-cost resource utilization system for acidic wastewater, including an acid cleaning unit 1, an acid regeneration unit, a pretreatment unit, an electro-adsorption treatment unit, and an alkali wastewater treatment unit; the waste acid liquid outlet of the pickling line 1 is connected with the waste acid liquid inlet of the acid regeneration unit through a pipeline; an acid wastewater outlet of the pickling line 1 is connected with a water inlet of the pretreatment unit through a pipeline, and a water outlet of the pretreatment unit is connected with a water inlet of the electro-adsorption treatment unit; a concentrated water outlet of the electro-adsorption treatment unit is connected with a regenerated acid absorption liquid inlet of the acid regeneration unit, a produced water outlet of the electro-adsorption treatment unit is connected with a water inlet of the alkali wastewater treatment unit, and a water outlet of the alkali wastewater treatment unit is connected with a water inlet pipe of a reclaimed water user or a deep user; and a regenerated acid outlet of the acid regeneration unit is connected with the pickling line 1. In the embodiment, the electro-adsorption treatment unit is adopted to adsorb and remove ions in the wastewater, so that the ion concentration of the produced water of the electro-adsorption treatment unit is reduced, and the condition that the effluent of the acidic wastewater has too high conductivity and metal ions and cannot be recycled or directly discharged is avoided; the acid regeneration unit carries out high-temperature pyrohydrolysis reaction on the waste acid liquor to generate high-temperature flue gas containing acidic components, and metal oxides are recovered; concentrated water of the electro-adsorption treatment unit enters the acid regeneration unit as a regenerated acid absorption liquid, regenerated acid formed after spraying and absorbing with high-temperature flue gas containing acidic components is sent back to the acid washing unit 1 for recycling, and produced water of the electro-adsorption treatment unit is discharged into the alkali wastewater treatment unit as an acid neutralizer of alkali wastewater for neutralization reaction, so that the adding amount of the acid neutralizer of the alkali wastewater and the adding amount of the alkali neutralizer of the acid produced water are reduced, salt is prevented from being increased, the quality of final recycled water is better, and the running cost is low.
Further, the electrosorption processing unit includes middle pond 7 and one-level electrosorption device 8, the delivery port of pretreatment unit is connected with the water inlet of middle pond 7, the delivery port of middle pond 7 with the water inlet of one-level electrosorption device 8 is connected, the dense water export of one-level electrosorption device 8 with the regeneration acid absorption liquid access connection of acid regeneration unit. Furthermore, the electric adsorption treatment unit further comprises a second-stage electric adsorption device 9 and a second middle water tank 10, a water production outlet of the first-stage electric adsorption device 8 is connected with a water inlet of the second-stage electric adsorption device 9, a water production outlet of the second-stage electric adsorption device 9 is connected with a water inlet of the second middle water tank 10, and a water outlet of the second middle water tank 10 is connected with a neutralization water inlet of the alkali wastewater treatment unit. Furthermore, a concentrated water outlet of the secondary electro-adsorption device 9 is connected with the first intermediate water tank 7. In the embodiment, the primary electro-adsorption device 8 and the secondary electro-adsorption device 9 are connected in series to treat the acidic wastewater, so that the quality of produced water of an electro-adsorption treatment unit is further improved, and the problem that the effluent is too high in conductivity and metal ions to be recycled or directly discharged due to the fact that only the primary electro-adsorption treatment is adopted is avoided; and the concentrated water of the first-stage electric adsorption device 8 is used as a regenerated acid absorption liquid, the concentrated water of the second-stage electric adsorption device 9 enters the first intermediate water tank 7 and then is subjected to two-stage electric adsorption treatment again, and the produced water of the second-stage electric adsorption device 9 is used as an alkaline wastewater acid neutralizer to perform neutralization reaction with the alkaline wastewater of the unit, so that the dosage of the alkaline wastewater acid neutralizer is reduced.
Furthermore, the alkali wastewater treatment unit comprises an alkali wastewater adjusting tank 11, a neutralization coagulation flocculation tank 1, an air flotation device 13, a biochemical device 14, a second sedimentation tank 15 and a filtering device 16 which are connected in sequence along the wastewater flow direction; the alkali wastewater adjusting tank 11 is connected with an alkali wastewater inlet pipe of the unit, and a water outlet of the intermediate water tank II 10 is connected with the alkali wastewater adjusting tank 11; the filtered water outlet of the filtering device 16 is connected with the water inlet pipe of a reclaimed water user or a depth user. In this embodiment, the produced water of the secondary electro-adsorption device 9 and the unit alkali wastewater are subjected to acid-base neutralization reaction, the dosage of the acid-base neutralizing agent for the alkali wastewater and the dosage of the acid-base neutralizing agent for the acid produced water of the secondary electro-adsorption device 9 are reduced, the consumption of the medicament is greatly reduced, the salt introduced by adding the acid-base neutralizing agent into the wastewater is reduced, the water quality entering a reclaimed water user or a deep user is better, the operation cost is low, and the nearly 100% recycling of the acid in the wastewater and the wastewater can be realized.
Furthermore, the acid regeneration unit comprises an acid regeneration reaction furnace 2 and an acid regeneration absorption device 3, wherein a waste acid liquid outlet of the acid pickling unit 1 is connected with a waste acid liquid inlet of the acid regeneration reaction furnace 2 through a pipeline, a high-temperature flue gas outlet of the acid regeneration reaction furnace 2 is connected with a high-temperature flue gas inlet of the acid regeneration absorption device 3, a concentrated water outlet of the primary electric adsorption device 8 is connected with a regenerated acid absorption liquid inlet of the acid regeneration absorption device 3, and a regenerated acid outlet of the acid regeneration absorption device 3 is connected with the acid pickling unit 1. In the embodiment, the concentrated water of the first-stage electro-adsorption device 8 is used as the regenerated acid absorption liquid, and is sprayed and absorbed with the high-temperature flue gas containing acidic components entering the acid regeneration absorption device 3 from the acid regeneration reaction furnace 2 to form regenerated acid, so that the consumption of external water resources is avoided; the waste acid liquid in the acid regeneration reaction furnace 2 can recover metal oxide after high-temperature hydrolysis reaction, thereby realizing the recovery of metal ions in the waste water.
Further, the pretreatment unit comprises an acidic wastewater adjusting tank 4, a first sedimentation tank 5 and an acidic wastewater filter 6 which are sequentially connected in the wastewater flowing direction, an acidic wastewater outlet of the pickling line 1 is connected with a water inlet of the acidic wastewater adjusting tank 4 through a pipeline, and a filtered water outlet of the acidic wastewater filter 6 is connected with a water inlet of the electro-adsorption treatment unit. The embodiment adopts the mode of sediment + filter to carry out the preliminary treatment, satisfies the requirement of intaking of electrosorption device. Furthermore, the shell of the acidic wastewater filter 6 is made of an acid-resistant material, and the filter material is made of an acid-resistant material, so that the problem that the acidic wastewater corrodes the acidic wastewater filter 6 to cause short service life of equipment is avoided. When the device is used for treating hydrochloric acid acidic wastewater, the shell of the acidic wastewater filter 6 can be made of glass fiber reinforced plastic materials or steel lining glue materials, and the filter material can be acid-washed quartz sand, an activated carbon filter material or a fiber filter material; when the device is used for treating acid wastewater mixed with acid, the shell of the acid wastewater filter 6 can be made of glass fiber reinforced plastic materials or steel lining glue materials, and the filter material can be an activated carbon filter material.
The embodiment also provides a method for treating the acidic wastewater and the waste acid liquor discharged by the pickling line by adopting the low-cost resource utilization system for the acidic wastewater, which comprises the following steps:
1) acid wastewater (the concentration of iron ions is 1500-3000mg/L, the conductivity is 4500-15000 mu s/cm) discharged by the acid cleaning unit 1 is discharged into the acid wastewater adjusting tank 4 through a network, and the water quantity and the water quality are adjusted in the acid wastewater adjusting tank 4; the waste acid liquor discharged by the pickling line 1 enters an acid regeneration reaction furnace 2 to carry out high-temperature pyrohydrolysis reaction, the generated high-temperature flue gas containing acidic components enters an acid regeneration absorption device 3, and metal oxides are recovered;
2) the acidic wastewater in the acidic wastewater adjusting tank 4 enters a first sedimentation tank 5 through a lifting pump, supernatant liquid after suspended particles are removed through sedimentation is lifted to enter an acidic wastewater filter 6, and filtered water after being filtered by the acidic wastewater filter 6 enters a first intermediate water tank 7; wherein, the pretreatment is carried out by adopting a mode of precipitation and a filter, so as to meet the water inlet requirement of the electric adsorption device; the shell of the acidic wastewater filter 6 is made of acid-resistant materials, and the filter material is an acid-resistant filter material;
3) the acidic wastewater in the intermediate water tank I7 enters a primary electric adsorption device 8 through a lift pump for treatment to obtain primary concentrated water and primary produced water; the first-stage electric adsorption device 8 adsorbs and removes Fe in the wastewater3+、Fe2+、H+、SiO3 2-、Cl-Plasma is carried out, the ion concentration of the primary produced water is reduced, the metal ion concentration of the generated primary concentrated water is 3-15 g/L, and the conductivity is 27000-100000 mu s/cm;
4) the primary concentrated water serving as a regenerated acid absorption liquid enters an acid regeneration absorption device 3, the high-temperature flue gas containing acidic components entering the acid regeneration absorption device 3 from an acid regeneration reaction furnace 2 is sprayed and absorbed to form regenerated acid, and the regenerated acid enters an acid washing machine set 1 through a pump for cyclic utilization, so that nearly 100% resource utilization of metal ions and acid in the wastewater is realized;
when the acidic wastewater in the step 1) is hydrochloric acid acidic wastewater, the regenerated acid is hydrochloric acid with the concentration of 200 g/L; when the acid wastewater in the step 1) is mixed acid wastewater, the regenerated acid is HF and HNO3The mixed acid of (1) and (2) has HF concentration of 5-60 g/L and HNO3The concentration of (a) is 80-160 g/L;
the first-stage produced water enters a second-stage electric adsorption device 9 through a lift pump for treatment to obtain second-stage concentrated water and second-stage produced water; the second-stage electric adsorption device 9 further adsorbs and removes Fe in the wastewater3+、Fe2+、H+、SiO3 2-、Cl-Plasma, further reducing the ion concentration of the produced water; the pH value of the secondary produced water is 2-4, the total iron content is 15-100 mg/L, and the conductivity is 100-500 mu s/cm;
5) the secondary concentrated water enters the first intermediate water tank 7 by utilizing the excess pressure and then enters the first electro-adsorption device 8 again for cyclic treatment, so that the overall recovery rate of the electro-adsorption device is improved;
the secondary product water automatically flows into a second intermediate water tank 10, the secondary product (acidity, pH value of 2-4) water in the second intermediate water tank 10 enters an alkaline wastewater regulating tank 11 of a wastewater station through a lift pump, and the secondary product water and the alkaline wastewater in the alkaline wastewater regulating tank 11 are subjected to acid-base neutralization reaction, so that the adding amount of an alkaline wastewater acid neutralizing agent and the adding amount of an acidic product water alkali neutralizing agent of a secondary electro-adsorption device 9 are reduced, the medicament consumption is greatly reduced, and simultaneously the salt introduced by adding the acid-base neutralizing agent in the wastewater is reduced; the wastewater after the neutralization reaction enters a neutralization, coagulation and flocculation tank 12 through a lift pump, the pH value is further adjusted in a neutralization unit, coagulation reaction is carried out in the coagulation tank, PAM is added in the flocculation tank for flocculation reaction, the effluent of the neutralization, coagulation and flocculation tank 12 automatically flows into an air flotation device 13, the effluent of the air flotation device 13 is sent to a reclaimed water user for use or is deeply recycled by adopting processes such as a double-membrane method after sequentially passing through a biochemical device 14, a sedimentation tank II 15 and a filtering device 16, and the resource utilization of the wastewater is realized; wherein the total iron content in the secondary produced water is about 15-100 mg/L, and the iron ions can be used as a coagulant of a coagulation tank, so that the use amount of the coagulant which needs to be added into the coagulation tank in the traditional alkali wastewater treatment process is greatly reduced; in addition, it should be particularly noted that, when the acidic wastewater in step 1) is hydrochloric acid acidic wastewater, the biochemical device 14 adopts an aerobic reaction tank; when the acid wastewater in the step 1) is mixed acid wastewater, the biochemical device 14 must adopt a mode of connecting an anoxic reaction tank and an aerobic reaction tank in series, and the anoxic reaction tank performs denitrification by using COD in the alkali wastewater to remove nitrate radical containing 15-50 mg/L in the secondary product water, so as to achieve the purpose of removing nitrate radical pollutants at low cost.
The secondary produced water in the intermediate water tank II 10 in the embodiment can also enter the acid preparation tank 17 to be mixed with supplementary new acid and then enter the acid washing unit 1 for reuse as supplementary acid; when the acidic wastewater in the step 1) is hydrochloric acid acidic wastewater, blending the secondary produced water and 18% hydrochloric acid in the step 5) in an acid blending tank 17 until the concentration of the hydrochloric acid is 200g/L, and then feeding the blended water as normal supplementary acid into an acid pickling unit 1; when the acid wastewater in the step 1) is mixed acid wastewater, the secondary produced water in the step 5) is mixed with 55% of HF, 98% or 68% of HNO3Blending the mixture in an acid blending pool 17 until the concentration of HF in the mixed acid is 5-60 g/L, HNO3The acid with the concentration of 80-160 g/L is used as normal supplementary acid to enter the pickling line 1.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the utility model can be made, and equivalents may be substituted for elements thereof without departing from the scope of the utility model.
Claims (8)
1. The utility model provides a low-cost utilization system of resource of acid waste water which characterized in that: comprises an acid washing machine set, an acid regeneration unit, a pretreatment unit, an electro-adsorption treatment unit and an alkali wastewater treatment unit; a waste acid liquid outlet of the pickling unit is connected with a waste acid liquid inlet of the acid regeneration unit through a pipeline; an acid wastewater outlet of the pickling line is connected with a water inlet of the pretreatment unit through a pipeline, and a water outlet of the pretreatment unit is connected with a water inlet of the electro-adsorption treatment unit; a concentrated water outlet of the electro-adsorption treatment unit is connected with a regenerated acid absorption liquid inlet of the acid regeneration unit, a produced water outlet of the electro-adsorption treatment unit is connected with a water inlet of the alkali wastewater treatment unit, and a water outlet of the alkali wastewater treatment unit is connected with a water inlet pipe of a reclaimed water user or a deep user; and a regenerated acid outlet of the acid regeneration unit is connected with the pickling line.
2. The low-cost resource utilization system of acidic wastewater as claimed in claim 1, wherein: the electric adsorption treatment unit comprises a middle water tank I and a first-level electric adsorption device, the water outlet of the pretreatment unit is connected with the water inlet of the middle water tank I, the water outlet of the middle water tank I is connected with the water inlet of the first-level electric adsorption device, and the concentrated water outlet of the first-level electric adsorption device is connected with the regenerated acid absorption liquid inlet of the acid regeneration unit.
3. The low-cost resource utilization system for the acidic wastewater as claimed in claim 2, wherein: the electric adsorption treatment unit further comprises a second-stage electric adsorption device and a middle water tank II, a water production outlet of the first-stage electric adsorption device is connected with a water inlet of the second-stage electric adsorption device, a water production outlet of the second-stage electric adsorption device is connected with a water inlet of the middle water tank II, and a water outlet of the middle water tank II is connected with a neutralization water inlet of the alkali wastewater treatment unit.
4. The low-cost resource utilization system for the acidic wastewater as claimed in claim 3, wherein: and a concentrated water outlet of the second-stage electric adsorption device is connected with the middle water tank I.
5. The low-cost resource utilization system of acidic wastewater as claimed in claim 3, wherein: the alkali wastewater treatment unit comprises an alkali wastewater adjusting tank, a neutralization coagulation flocculation tank, an air floatation device, a biochemical device, a sedimentation tank II and a filtering device which are sequentially connected in the wastewater flow direction; the alkali wastewater adjusting tank is connected with an alkali wastewater inlet pipe of the unit, and a water outlet of the intermediate water tank II is connected with the alkali wastewater adjusting tank; and a water filtering outlet of the filtering device is connected with a water inlet pipe of a reclaimed water user or a depth user.
6. The low-cost resource utilization system of acidic wastewater as claimed in claim 2, wherein: the acid regeneration unit comprises an acid regeneration reaction furnace and an acid regeneration absorption device, wherein a spent acid liquid outlet of the acid washing unit is connected with a spent acid liquid inlet of the acid regeneration reaction furnace through a pipeline, a high-temperature flue gas outlet of the acid regeneration reaction furnace is connected with a high-temperature flue gas inlet of the acid regeneration absorption device, a concentrated water outlet of the primary electric adsorption device is connected with a regenerated acid absorption liquid inlet of the acid regeneration absorption device, and a regenerated acid outlet of the acid regeneration absorption device is connected with the acid washing unit.
7. The low-cost resource utilization system of acidic wastewater as claimed in claim 1, wherein: the pretreatment unit comprises an acidic wastewater adjusting tank, a first sedimentation tank and an acidic wastewater filter which are sequentially connected along the wastewater flow direction, an acidic wastewater outlet of the pickling line is connected with a water inlet of the acidic wastewater adjusting tank through a pipeline, and a filtered water outlet of the acidic wastewater filter is connected with a water inlet of the electro-adsorption treatment unit.
8. The low-cost resource utilization system of acidic wastewater according to claim 7, characterized in that: the shell of the acidic wastewater filter is made of an acid-resistant material, and the filter material is made of an acid-resistant material.
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