CN111453905A - Recycling treatment process and device for regenerated acid-base wastewater - Google Patents
Recycling treatment process and device for regenerated acid-base wastewater Download PDFInfo
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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
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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Abstract
The invention relates to the technical field of regenerated acid-base wastewater treatment, in particular to a regenerated acid-base wastewater recycling treatment process and a device thereof. The method comprises the following steps: 1) mixing regenerated acidic waste water, hydrating regenerated alkaline waste water, performing preneutralization, and adding hydrochloric acid or caustic soda to control the pH value of the mixed solution to a set value to obtain a pretreated mixed solution; 2) adding sea salt into the pre-treatment mixed solution, and introducing steam simultaneously to convert the neutralized wastewater into saturated hot brine; 3) adding soda into saturated hot brine to remove calcium ions in the hot brine, then adding caustic soda to remove magnesium ions in the hot brine, obtaining solid precipitate and target brine after the completion, and separating the solid precipitate from the target brine through filtration to obtain the calcium-magnesium alloy. According to the invention, the acid-base wastewater is neutralized and then added with the main and auxiliary materials, and the main metal ions in the filtered wastewater meet the requirement of salt water for ionic membrane production, so that the complete recovery and resource treatment of the chelating resin regenerated acid-base wastewater in the chlor-alkali process are realized.
Description
Technical Field
The invention relates to the technical field of regenerated acid-base wastewater treatment, in particular to a process and a device for recycling acid-base wastewater generated by resin regeneration in a chlor-alkali plant.
Background
The information disclosed in this background of the invention is only for enhancement of understanding of the general background of the invention and is not necessarily to be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
The acid-base waste water regenerated by the chlorine-alkali factory is the acid-base waste water generated by the regeneration of chelate resin in the secondary refining procedure of brine in the production process of an ionic membrane, and has the characteristics of high chlorine radical (up to 1 ten thousand-5 ten thousand mg/l) and more divalent metal ions (metal ions from an adsorbed saline water system) such as calcium, magnesium and the like. The regenerated acid-base wastewater has high-concentration acidity (pH is less than or equal to 1) or alkalinity (pH is more than or equal to 14).
For the treatment of such wastewater, a common method is to add caustic soda and hydrochloric acid to the acid and alkali wastewater respectively for neutralization, and then send the acid and alkali wastewater to sewage treatment. However, the present inventors found that: because the water contains a large amount of chloride ions and the amount of the regenerated water is large every day, the sewage treatment and the disposal are difficult, and the direct discharge also causes a large amount of waste of water sources. In addition, the emission of chloride ions in this portion of water also causes an increase in production costs. Meanwhile, the water contains metal ions and other components which have the value of recycling. In conclusion, the existing treatment method for the regenerated acid-base wastewater of the chlor-alkali plant not only easily causes resource waste, but also is not beneficial to enterprise synergy and cost reduction.
Disclosure of Invention
Aiming at the problems, the invention provides a process and a device for recycling regenerated acid-base wastewater. According to the invention, the acid-base wastewater is neutralized and then added with the main and auxiliary materials, the main metal ions in the filtered wastewater meet the requirement of brine for ionic membrane production, so that the chelate resin regenerated acid-base wastewater in the brine secondary refining process is completely recycled, the regenerated acid-base wastewater is discharged zero, and the resource treatment of the regenerated acid-base wastewater is realized.
The first object of the present invention: provides a recycling treatment process for regenerated acid-base wastewater.
The second object of the present invention: provides a recycling treatment device for regenerated acid-base wastewater.
In order to achieve the purpose, the invention adopts the following technical means:
the invention discloses a recycling treatment process of regenerated acid-base wastewater, which comprises the following steps:
(1) the regenerated acidic waste water and the regenerated alkaline waste water are mixed and then are pre-neutralized, and then hydrochloric acid or caustic soda is added to control the pH value of the mixed solution at a set value, so that a pre-treated mixed solution is obtained.
(2) Sea salt is added into the pretreatment mixed liquid, and steam is introduced at the same time, so that the neutralized wastewater is converted into saturated hot brine.
(3) Adding soda into saturated hot brine to remove calcium ions in the hot brine, then adding caustic soda to remove magnesium ions in the hot brine, obtaining solid precipitate and target brine after the completion, and separating the solid precipitate from the target brine through filtration to obtain the calcium-magnesium alloy.
Further, in the step (1), the pH of the pretreatment mixed liquor is controlled to be between 5 and 10, for example, between 6 and 9, between 5 and 7, or between 9 and 10, so as to meet the requirement of the target brine as the raw material of the secondary brine in the primary refined brine process.
Further, in the step (2), the temperature of the saturated hot brine is controlled to be between 40 and 60 ℃, for example, the temperature can be 45 to 55 ℃, or 40 to 50 ℃, or 55 to 60 ℃. The waste water can be directly used as primary refined brine after neutralization, salt melting and refining (calcium and magnesium ion removal). If the water is not dissolved into saturated brine, solid salt and other materials are required to be added into the water again, so that the waste of auxiliary materials and heat is caused, and the energy of transported materials is also caused. In addition, the purpose of heating is to accelerate the reaction rate of sea salt dissolution and precipitation generation during subsequent refining, and ensure effective filtration of impurities.
Further, in the step (3), the salt content of the target brine is more than or equal to 300g/l, for example, 303 ± 2g/l, or 303 ± 1g/l, etc., so as to meet the requirement of the target brine as the raw material of the secondary brine in the primary refined brine process.
Further, in the step (3), the sum content of calcium ions and magnesium ions in the target saline is less than or equal to 10mg/l, for example, less than or equal to 3mg/l, or less than or equal to 1 mg/l; so as to meet the requirement that the target brine is used as a secondary brine raw material in the primary refined brine process.
In a second aspect of the present invention, a recycling treatment apparatus for regenerated acid-base wastewater is disclosed, comprising: the system comprises an acidic wastewater collection tank, an alkaline wastewater collection tank, a neutralization tank, a caustic soda storage device, a hydrochloric acid storage device, a salt dissolving tank, a calcium-magnesium ion sedimentation tank, a filter, a sea salt storage device, a steam source and a soda storage device. The wastewater collecting tank, the alkaline wastewater collecting tank, the caustic soda storage device and the hydrochloric acid storage device are communicated with the neutralizing tank. The neutralization tank, the salt dissolving tank, the calcium and magnesium ion sedimentation tank and the filter are communicated in sequence. The sea salt storage device and the steam source are both connected with the salt dissolving tank, the soda ash storage device is connected with the calcium magnesium ion sedimentation tank, and the calcium magnesium ion sedimentation tank is connected with the caustic soda storage device.
Further, the neutralization tank and the salt dissolving tank are connected through a neutralization pump, and the calcium and magnesium ion sedimentation tank and the filter are connected through a brine pump.
Furthermore, the calcium-magnesium ion sedimentation tank is divided into a calcium ion sedimentation tank and a magnesium ion sedimentation tank which are adjacent, and the calcium ion sedimentation tank and the magnesium ion sedimentation tank are connected in a form of an overflow weir, so that the waste water is conveyed; the soda ash storage device is connected with the calcium ion sedimentation tank; and the caustic soda storage device is connected with the magnesium ion sedimentation tank.
Furthermore, in the disposal device, the connection modes of all the pipe fittings for connecting all the parts are steel lining PE pipe connection, so that leakage points and corrosion are reduced to the maximum extent.
Further, the acid wastewater collecting tank, the alkaline wastewater collecting tank, the neutralizing tank, the caustic soda storage device and the hydrochloric acid storage device jointly form a liquid recovery and neutralizing system, in the system, the acid wastewater collecting tank and the hydrochloric acid storage device are stored in a sealed mode, and a water sealing system is arranged in a gas phase, so that peculiar smell is prevented from overflowing.
Compared with the prior art, the invention has the following beneficial effects:
(1) the method removes calcium and magnesium in the regenerated acid-base wastewater, and meets the requirement of using brine by adding sea salt as a main material, so that the wastewater is not discharged, the environmental pollution is reduced, and the benefit is ensured.
(2) The method finally converts the regenerated acid-base wastewater into the raw material of secondary brine which can meet the requirement of the primary refined brine process, thereby reducing the large amount of water supplement in a brine system and reducing the water consumption of enterprises.
(3) The invention adds the auxiliary materials of the caustic soda and the soda ash, removes calcium and magnesium ions in the wastewater, combines sodium ions in the caustic soda and the soda ash with chloride ions in the wastewater to form sodium chloride, recycles the chloride ions in the wastewater, fully utilizes the caustic soda and the soda ash and avoids the defects of other wastes generated by wastewater treatment.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic structural diagram of a recycling treatment device for regenerated acid-base wastewater in an embodiment of the invention; the labels in the figures represent: 1-acid wastewater collection tank, 2-alkaline wastewater collection tank, 3-neutralization tank, 4-caustic soda storage device, 5-hydrochloric acid storage device, 6-salt dissolving tank, 7-calcium magnesium ion sedimentation tank, 8-filter, 9-sea salt storage device, 10-steam source, 11-soda ash storage device, 12-neutralization pump and 13-brine pump.
Detailed Description
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
For convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate that the directions of movement are consistent with those of the drawings, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element needs to have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
Term interpretation section: the terms "mounted," "connected," "fixed," and the like in the present invention are to be understood in a broad sense, and for example, the terms "mounted," "connected," and "fixed" may be fixed, detachable, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As mentioned above, the existing method for treating acid-base wastewater regenerated by a chlor-alkali plant by adding acid or alkali has the problems of difficult sewage treatment and disposal, resource waste, high energy consumption, high cost and the like. Therefore, the invention provides a process and a device for recycling acid-base wastewater generated by resin regeneration in a chlor-alkali plant; the invention will now be further described with reference to the drawings and detailed description.
First of allExamples
Referring to fig. 1, an example of a recycling treatment device for regenerated acid-base wastewater includes: the system comprises an acidic wastewater collection tank 1, an alkaline wastewater collection tank 2, a neutralization tank 3, a caustic soda storage device 4, a hydrochloric acid storage device 5, a salt dissolving tank 6, a calcium and magnesium ion sedimentation tank 7, a filter 8, a sea salt storage device 9, a steam source 10 and a soda storage device 11. Wherein:
acid wastewater collecting tank 1 and alkaline wastewater collecting tank 2 all communicate with neutralization pond 3 through the pipeline, and are provided with the water pump on the connecting line, and the regenerated acid of chlor-alkali plant resin, alkali waste water discharge into foretell collecting tank respectively and keep in, then carry out subsequent processing by leading-in neutralization pond of water pump.
The caustic soda storage device 4 and the hydrochloric acid storage device 5 are also communicated with the neutralization tank 3 through pipelines. The caustic soda storage device 4 and the hydrochloric acid storage device 5 are mainly used for providing caustic soda and hydrochloric acid into the neutralization pond so as to respectively perform neutralization treatment on the regenerated acidic wastewater or the regenerated alkaline wastewater, and firstly, the pH value of the wastewater meets the requirement of target brine, because the target brine is used as a raw material of secondary brine in a primary refined brine process; and secondly, the phenomena that the added soda ash is reacted in the subsequent calcium and magnesium metal ion removing process to remove metal ions, and the calcium and magnesium ions are difficult to dissolve because the precipitate of the calcium and magnesium ions generated in the acidic environment is difficult to exist stably, so that the calcium and magnesium ions can not be removed at the same time are avoided. These calcium and magnesium ions are impurities which cannot be present in large amounts in the target brine of the present invention, and which cannot be used as a raw material for secondary brine.
Further, the neutralization pond 3, the salt dissolving pond 6, the calcium and magnesium ion sedimentation pond 7 and the filter 8 are sequentially communicated through a pipeline, the neutralization pond 3 and the salt dissolving pond 6 are connected through a neutralization pump 12, and the calcium and magnesium ion sedimentation pond 7 and the filter 8 are communicated through a brine pump 13. The sea salt storage device 9 and the steam source 10 are communicated with the salt dissolving tank 6 through pipelines, the soda ash storage device 11 is connected with the calcium and magnesium ion sedimentation tank 7, and the caustic soda storage device 4 is simultaneously connected with the calcium and magnesium ion sedimentation tank 7. Most of calcium and magnesium ions in the wastewater subjected to neutralization treatment need to be further removed, calcium ions and most of magnesium ions in the wastewater can be removed by adding soda ash, magnesium ions in the wastewater cannot be completely removed due to the fact that magnesium carbonate is slightly soluble in water, and the remaining magnesium ions in the wastewater can be further removed by adding caustic soda. Sodium ions in soda ash and caustic soda and a large amount of chloride ions in wastewater form brine, so that impurity metal ions are removed, the chloride ions in the wastewater and sodium ions in auxiliary materials are utilized, the defect that other wastes are generated due to wastewater treatment is overcome, the defect is that most of the problems commonly existing in the wastewater treatment at present, namely the problem of waste treatment is solved, the aim of not producing or producing the wastes as little as possible in the whole life cycle of the treatment process is difficult to achieve, the problems of complex procedures, high cost and high energy consumption of a plurality of wastewater treatment processes are caused, and the difficulty of pollution treatment of enterprises is increased. The filter 8 finally separates the precipitate of calcium and magnesium ions from the liquid to obtain the target brine, and the precipitate can be directly sold as an industrial raw material, for example, magnesium hydroxide has excellent flame retardant effect, calcium carbonate is an inorganic mineral widely distributed in nature and does not harm the environment, and the shell is used as a filler in a flame retardant material together with magnesium hydroxide.
Second embodiment
A resource treatment device for regenerated acid-base wastewater, which is continuously referred to the first embodiment, except that: calcium magnesium ion sedimentation tank 7 separates for adjacent calcium ion sedimentation tank and magnesium ion sedimentation tank, and connects through the form of overflow weir between the two, soda storage device 11 is connected with the calcium ion sedimentation tank, caustic soda storage device 4 is connected with the magnesium ion sedimentation tank, and each pipe connection mode is steel lining PE pipe connection to reduce leakage point and corruption in the at utmost. Firstly, can realize the waste water after handling under the condition that does not need mechanical power and carry, reduce power consumption and noise. Secondly, solid impurities in the wastewater are prevented from entering a lower device as much as possible in an overflow mode, and the load of the filter is increased. In addition, calcium ion precipitation and magnesium ion precipitation are respectively carried out in an overflow mode, so that accurate control of soda ash and caustic soda is facilitated, and the caustic soda has the main function of removing residual magnesium ions in sewage and needs to be added according to specific conditions. The mixture of the sediment filtered by the filter can be used as an additive of a flame retardant material, so that the problem of waste control and production is avoided as much as possible, and the harmless and recycling treatment of the regenerated acid-base wastewater is realized.
Third embodiment
A resource treatment process for regenerated acid-base wastewater is implemented by adopting a treatment device in a second embodiment, and specifically comprises the following steps:
(1) acid waste water (hydrochloric acid content: 0.5%, calcium ion: 40-60ppm, magnesium ion: 10-20ppm, strontium ion: 5-15ppm, iron ion: 0.5-2.5ppm, chloride ion: 8-20g/l) generated by the regeneration of chelate resin in the secondary brine refining procedure in the production process of ionic membrane in chlor-alkali plant is led into an acid waste water collecting tank 1 through a water pipeline for storage; leading alkaline wastewater (the content of caustic soda is 0.2-0.3%, and the content of calcium, magnesium, strontium and iron ions is below 1 ppm) generated by chelating resin regeneration into an alkaline wastewater collecting tank 2 through a water pipeline for storage; and (3) pumping the acid and alkali wastewater in the acid wastewater collection tank 1 and the alkaline wastewater collection tank 2 into a neutralization tank through a water pump for neutralization, adding caustic soda with the mass concentration of 32% into the neutralization tank 3 through a caustic soda storage device 4, and controlling the pH value of the wastewater to be between 8 and 9 to obtain a pretreatment mixed solution.
(2) Pumping the pretreatment mixed liquor obtained in the step (1) into a salt dissolving pool 11 through a neutralization pump 12, adding sea salt into the pretreatment mixed liquor through a sea salt storage device, introducing steam into the pretreatment mixed liquor through a steam source and a steam pipeline to convert neutralized wastewater into saturated brine, and controlling the temperature of the saturated brine within the temperature range of 40-50 ℃ in the continuous treatment process.
(3) And (3) pumping the saturated brine obtained in the step (2) into a calcium ion sedimentation tank, adding soda ash to remove calcium ions and most magnesium ions in hot brine, enabling the wastewater to enter the magnesium ion sedimentation tank in an overflow mode, then detecting the concentration of magnesium ions in the wastewater in the magnesium ion sedimentation tank, adding caustic soda to remove the residual magnesium ions, enabling the salt content in the brine to be 303 +/-3 g/l and the sum content of the calcium ions and the magnesium ions to be less than or equal to 10mg/l, thus obtaining solid sediment and brine, finally filtering the supernatant in the magnesium ion sedimentation tank again through a brine pump, separating the solid sediment from the supernatant, wherein the supernatant is the target brine, and is directly used as a raw material of secondary brine in the primary refined brine process.
Fourth embodiment
A resource treatment process for regenerated acid-base wastewater is implemented by adopting a treatment device in a second embodiment, and specifically comprises the following steps:
(1) acid waste water (hydrochloric acid content: 0.5%, calcium ion: 40-60ppm, magnesium ion: 10-20ppm, strontium ion: 5-15ppm, iron ion: 0.5-2.5ppm, chloride ion: 8-20g/l) generated by the regeneration of chelate resin in the secondary brine refining procedure in the production process of ionic membrane in chlor-alkali plant is led into an acid waste water collecting tank 1 through a water pipeline for storage; leading alkaline wastewater (the content of caustic soda is 0.2-0.3%, and the content of calcium, magnesium, strontium and iron ions is below 1 ppm) generated by chelating resin regeneration into an alkaline wastewater collecting tank 2 through a water pipeline for storage; and (3) pumping the acid and alkali wastewater in the acid wastewater collection tank 1 and the alkaline wastewater collection tank 2 into a neutralization tank through a water pump for neutralization, adding hydrochloric acid with the mass concentration of 31% into the neutralization tank 3 through a hydrochloric acid storage device 5, and controlling the pH value of the wastewater to be between 5 and 7 to obtain a pretreatment mixed solution.
(2) Pumping the pretreatment mixed liquor obtained in the step (1) into a salt dissolving pool 11 through a neutralization pump 12, adding sea salt into the pretreatment mixed liquor through a sea salt storage device, introducing steam into the pretreatment mixed liquor through a steam source and a steam pipeline to convert neutralized wastewater into saturated brine, and controlling the temperature of the saturated brine within the temperature range of 45-55 ℃ in the continuous treatment process.
(3) And (3) pumping the saturated brine obtained in the step (2) into a calcium ion sedimentation tank, adding soda ash to remove calcium ions and most magnesium ions in hot brine, enabling the wastewater to enter the magnesium ion sedimentation tank in an overflow mode, then detecting the concentration of magnesium ions in the wastewater in the magnesium ion sedimentation tank, adding caustic soda to remove the residual magnesium ions, enabling the salt content in the brine to be 303 +/-2 g/l and the sum content of the calcium ions and the magnesium ions to be less than or equal to 3mg/l, thus obtaining solid sediment and brine, finally filtering the supernatant in the magnesium ion sedimentation tank again through a brine pump, separating the solid sediment from the supernatant, wherein the supernatant is the target brine, and is directly used as a raw material of secondary brine in the primary refined brine process.
Fifth embodiment
A resource treatment process for regenerated acid-base wastewater is implemented by adopting a treatment device in a second embodiment, and specifically comprises the following steps:
(1) acid waste water (hydrochloric acid content: 0.5%, calcium ion: 40-60ppm, magnesium ion: 10-20ppm, strontium ion: 5-15ppm, iron ion: 0.5-2.5ppm, chloride ion: 8-20g/l) generated by the regeneration of chelate resin in the secondary brine refining procedure in the production process of ionic membrane in chlor-alkali plant is led into an acid waste water collecting tank 1 through a water pipeline for storage; leading alkaline wastewater (the content of caustic soda is 0.2-0.3%, and the content of calcium, magnesium, strontium and iron ions is below 1 ppm) generated by chelating resin regeneration into an alkaline wastewater collecting tank 2 through a water pipeline for storage; and (3) pumping the acid and alkali wastewater in the acid wastewater collection tank 1 and the alkaline wastewater collection tank 2 into a neutralization tank through a water pump for neutralization, adding caustic soda with the mass concentration of 32% into the neutralization tank 3 through a caustic soda storage device 4, and controlling the pH value of the wastewater to be between 9 and 10 to obtain a pretreatment mixed solution.
(2) Pumping the pretreatment mixed liquor obtained in the step (1) into a salt dissolving pool 11 through a neutralization pump 12, adding sea salt into the pretreatment mixed liquor through a sea salt storage device, introducing steam into the pretreatment mixed liquor through a steam source and a steam pipeline to convert neutralized wastewater into saturated brine, and controlling the temperature of the saturated brine within the temperature range of 55-60 ℃ in the continuous treatment process.
(3) And (3) pumping the saturated brine obtained in the step (2) into a calcium ion sedimentation tank, adding soda ash to remove calcium ions and most magnesium ions in hot brine, enabling the wastewater to enter the magnesium ion sedimentation tank in an overflow mode, then detecting the concentration of magnesium ions in the wastewater in the magnesium ion sedimentation tank, adding caustic soda to remove the residual magnesium ions, enabling the salt content in the brine to be 305 +/-5 g/l and the sum content of the calcium ions and the magnesium ions to be less than or equal to 1mg/l, thus obtaining solid sediment and brine, finally filtering the supernatant in the magnesium ion sedimentation tank again through a brine pump, separating the solid sediment from the supernatant, wherein the supernatant is the target brine, and is directly used as a raw material of secondary brine in the primary refined brine process.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a regeneration acid-base waste water resourceful treatment device which characterized in that includes: the system comprises an acidic wastewater collection tank, an alkaline wastewater collection tank, a neutralization tank, a caustic soda storage device, a hydrochloric acid storage device, a salt dissolving tank, a calcium-magnesium ion sedimentation tank, a filter, a sea salt storage device, a steam source and a soda storage device; the sexual wastewater collecting tank, the alkaline wastewater collecting tank, the caustic soda storage device and the hydrochloric acid storage device are all communicated with the neutralization tank; the neutralization tank, the salt dissolving tank, the calcium and magnesium ion sedimentation tank and the filter are communicated in sequence; the sea salt storage device and the steam source are both connected with the salt dissolving tank, the soda ash storage device is connected with the calcium magnesium ion sedimentation tank, and the calcium magnesium ion sedimentation tank is connected with the caustic soda storage device.
2. The apparatus for recycling and disposing of regenerated acid-base wastewater as set forth in claim 1, wherein the neutralization tank and the salt dissolving tank are connected by a neutralization pump.
3. The recycling apparatus for waste water containing regenerated acid and alkali as claimed in claim 1, wherein the calcium magnesium ion sedimentation tank and the filter are connected by a brine pump.
4. The recycling device for regenerated acid-base wastewater as claimed in claim 1, wherein the calcium-magnesium ion sedimentation tank is divided into a calcium ion sedimentation tank and a magnesium ion sedimentation tank which are adjacent to each other, and the calcium ion sedimentation tank and the magnesium ion sedimentation tank are connected with each other in a form of an overflow weir to realize the transportation of wastewater; the soda ash storage device is connected with the calcium ion sedimentation tank; and the caustic soda storage device is connected with the magnesium ion sedimentation tank.
5. A recycling device for regenerated acid-base wastewater as set forth in any one of claims 1-3, wherein the connecting mode of each pipe for connecting each component in the device is steel lining PE pipe connection.
6. A resource treatment process for regenerated acid-base wastewater is characterized by comprising the following steps:
(1) mixing the regenerated acidic waste water and the regenerated alkaline waste water, then performing pre-neutralization, and then adding hydrochloric acid or caustic soda to control the pH value of the mixed solution at a set value to obtain a pretreated mixed solution;
(2) adding sea salt into the pre-treatment mixed solution, and introducing steam simultaneously to convert the neutralized wastewater into saturated hot brine;
(3) adding soda into saturated hot brine to remove calcium ions in the hot brine, then adding caustic soda to remove magnesium ions in the hot brine, obtaining solid precipitate and target brine after the completion, and separating the solid precipitate from the target brine through filtration to obtain the calcium-magnesium alloy.
7. The recycling treatment process of regenerated acid-base wastewater as claimed in claim 6, wherein in step (1), the pH of the pretreatment mixed liquor is controlled between 5 and 10, preferably between 6 and 9.
8. The recycling treatment process of regenerated acid-base wastewater as claimed in claim 6, wherein in the step (2), the temperature of the saturated hot brine is controlled between 40-60 ℃, preferably 45-55 ℃.
9. The recycling treatment process of regenerated acid-base wastewater as claimed in claim 6, wherein in step (3), the salt content of the target brine is more than or equal to 300g/l, preferably 303 ± 2 g/l.
10. The recycling treatment process of regenerated acid-base wastewater as claimed in claim 6, wherein in step (3), the sum content of calcium and magnesium ions in the target brine is less than or equal to 10mg/l, preferably less than or equal to 3 mg/l.
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