CN111825238A - Method and device for membrane method resource treatment of dilute sulfuric acid - Google Patents
Method and device for membrane method resource treatment of dilute sulfuric acid Download PDFInfo
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- CN111825238A CN111825238A CN202010647121.0A CN202010647121A CN111825238A CN 111825238 A CN111825238 A CN 111825238A CN 202010647121 A CN202010647121 A CN 202010647121A CN 111825238 A CN111825238 A CN 111825238A
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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Abstract
The invention discloses a method and a device for membrane method resource treatment of dilute sulfuric acid, which relate to the field of industrial wastewater treatment and comprise the following steps: s1: neutralization regulation; mixing dilute sulfuric acid and dilute ammonia water, and adjusting the pH value to completely convert the sulfuric acid into ammonium sulfate; s2: precipitating and filtering; standing and precipitating the dilute ammonium sulfate solution generated in the step S1, then filtering the dilute ammonium sulfate solution to enable the dilute ammonium sulfate solution to become clear liquid, preparing filter residues generated by filtering into dry residues, and recycling the dry residues; s3: processing a membrane group; and (4) separating the clear liquid obtained in the step S2 by a two-stage membrane group to obtain a 12-20% concentrated ammonium sulfate solution, recovering the concentrated ammonium sulfate solution, and recovering clean water for industrial production. According to the invention, dilute sulfuric acid is neutralized and concentrated to recover an ammonium sulfate product, produced clean water is used for replenishing water for a production system, a solution is filtered to ensure the quality of the ammonium sulfate product, and clear liquid is subjected to salt water separation by adopting a membrane group mechanism to realize concentration and ensure the quality of the clean water.
Description
Technical Field
The invention relates to the field of industrial wastewater treatment, in particular to a membrane method resource treatment method and a device thereof for dilute sulfuric acid.
Background
At present, because the content of sulfuric acid in dilute sulfuric acid is low, a large amount of acid water is few in use occasions, so that the direct use difficulty of the dilute acid is high, and the water balance in a plant is difficult to realize.
The prior common treatment method is that part of the treatment method is directly used by a production device process, and the rest treatment method is mainly solved by lime neutralization, dilute acid concentration and the like.
The lime neutralization method is used for treating dilute sulfuric acid, so that the waste of sulfuric acid resources is caused, and the produced gypsum is still hazardous waste and needs to be continuously treated subsequently; the filtered clear liquid can not be used for a production device and is sent to a sewage treatment device for treatment.
The dilute acid concentration method is to increase the concentration of dilute acid by means of evaporation concentration, and the concentrated sulfuric acid solution is recycled. The method has the advantages of large investment and high energy consumption, impurities in the concentrated sulfuric acid cannot be removed to cause damage to subsequent use, the condensate is still acidic, and the use is limited or used for sewage treatment.
In conclusion, in the conventional dilute acid treatment method, some methods have resource waste, some methods have secondary pollution, some methods have poor investment income, and the quality of recovered water is poor, so that the problems of dilute acid treatment and environmental protection cannot be thoroughly solved.
Disclosure of Invention
The invention aims to provide a membrane method resource treatment method of dilute sulfuric acid and a device thereof, which aim to solve the technical problem that the problems of dilute acid treatment and environmental protection in the prior art cannot be thoroughly solved.
The invention provides a membrane method for resourceful treatment of dilute sulfuric acid, which is characterized in that; the method comprises the following steps:
s1: neutralization regulation; mixing dilute sulfuric acid and dilute ammonia water, and adjusting the pH value to completely convert the sulfuric acid into ammonium sulfate;
s2: precipitating and filtering; standing and precipitating the dilute ammonium sulfate solution generated in the step S1, then filtering the dilute ammonium sulfate solution to enable the dilute ammonium sulfate solution to become clear liquid, preparing filter residues generated by filtering into dry residues, and recycling the dry residues;
s3: processing a module; and (4) separating the clear liquid obtained in the step S2 by a two-stage membrane group to obtain a 12-20% concentrated ammonium sulfate solution, recovering the concentrated ammonium sulfate solution, and recovering clean water for industrial production.
Further, the dilute sulfuric acid and the dilute ammonia water in the step S1 contain 1 to 5 wt% of sulfuric acid and 1 to 25 wt% of ammonia water, in terms of weight fraction.
Further, the pH value of the dilute sulfuric acid and the ammonia water neutralized in the step S1 is adjusted to be 5-10.
Further, the dry slag in the step S2 has a solid content of 70-80 wt% in terms of weight fraction.
Further, the ammonium sulfate solution in the step S3 contains 12 to 20 wt% of ammonium sulfate in terms of weight fraction; the TDS of the produced clean water is less than or equal to 500 mg/l.
Further, the membrane group treatment in the S3 step may be ultrafiltration, nanofiltration, reverse osmosis, electrodialysis, or the like.
The invention also provides a device for treating dilute sulfuric acid by membrane resource utilization, which comprises a PH adjusting mechanism, a high-efficiency filter, a precision filter and a module mechanism, wherein the PH adjusting mechanism, the high-efficiency filter, the precision filter and the membrane module mechanism are sequentially communicated through a pipeline, the PH adjusting mechanism comprises a primary adjusting component and two precision adjusting components, the two precision adjusting components are arranged at the side of the primary adjusting component, a primary filtering pipe for communicating the primary adjusting component and the high-efficiency filter is arranged between the precision adjusting component and the high-efficiency filter, a filtering and conveying pump is arranged in the middle of the primary filtering pipe, the precision filtering pipe for communicating the high-efficiency filter and the precision filter is arranged between the high-efficiency filter and the precision filter, a drain pipe and a drain pipe are arranged on the module mechanism, and first control valves are arranged on the drain.
Further, elementary regulating assembly includes regulating tower, dilute sulphuric acid feed liquor pipe, weak aqua ammonia feed liquor pipe, aeration dish, breather pipe and circulating air pump, dilute sulphuric acid feed liquor pipe and weak aqua ammonia feed liquor pipe all set up the side at the regulating tower, the aeration dish sets up the bottom inboard at the regulating tower, the one end and the aeration dish intercommunication of breather pipe, the other end of breather pipe and the upper end intercommunication of regulating tower, the circulating air pump sets up the middle part at the breather pipe, the lower part of regulating tower is equipped with the drain pipe, the middle part of drain pipe is equipped with out the liquid pump.
Further, the upper portion of the adjusting tower inboard is equipped with spiral inlet channel, the one end of dilute sulphuric acid feed liquor pipe is located the top of spiral inlet channel upper end, the one end of dilute ammonia water feed liquor pipe extends to the top at spiral inlet channel middle part, dilute sulphuric acid feed liquor pipe and dilute ammonia water feed liquor pipe all set up along the tangent line of adjusting tower.
Further, every the accurate regulating assembly includes the regulating box, adjusts the feed liquor pipe, adjusts inlet pipe and discharge pipe, the inboard bottom of regulating box is the slope setting, the one end and the drain pipe intercommunication of adjusting the feed liquor pipe, the other end of adjusting the feed liquor pipe extends to the middle part of regulating box, adjust the inlet pipe and adjust the feed liquor pipe setting from the other end orientation of regulating box, the one end and the regulating box intercommunication of discharge pipe, the other end and the elementary filter tube intercommunication of discharge pipe, all be equipped with the second control valve on adjusting the feed liquor pipe, adjusting inlet pipe and the discharge pipe, every all be equipped with the PH sensor in the accurate regulating box.
Compared with the prior art, the invention has the beneficial effects that:
firstly, the membrane method resource treatment method of dilute sulfuric acid recovers ammonium sulfate products after neutralizing and concentrating dilute sulfuric acid when treating dilute sulfuric acid, and the produced clean water is used for replenishing water of a production system. The solution is purified by a high-efficiency filter, impurities in the solution are removed, and the quality of an ammonium sulfate product and the influence of subsequent devices are guaranteed. The clear solution adopts module mechanism to realize the salt water separation, realizes concentrating, guarantees the clean water quality.
Secondly, the membrane method resource treatment method for dilute sulfuric acid adopts a novel efficient membrane group mechanism, realizes pure physical separation of slag, salt and water, ensures product quality, avoids secondary pollution, has low investment and operation cost, and finally realizes thorough solution of the dilute sulfuric acid problem.
Thirdly, compared with the traditional dilute acid evaporation concentration process, the membrane method for recycling dilute sulfuric acid can reduce the investment by 1/2, reduce the operation cost by 2/3, recycle all the byproduct water and reduce the sewage treatment cost.
Fourthly, when the device works, dilute sulfuric acid enters the adjusting tower from the dilute sulfuric acid liquid inlet pipe, meanwhile, dilute ammonia water enters the adjusting tower from the dilute ammonia water liquid inlet pipe, reaction neutralization is carried out between the dilute sulfuric acid and the adjusting tower, meanwhile, air on the upper portion of the adjusting tower is conveyed into the aeration disc through the circulating air pump and the vent pipe, the dilute sulfuric acid and the dilute ammonia water are stirred, on one hand, the reaction efficiency can be improved, on the other hand, volatile ammonia gas can be conveyed into the mixed liquid again through the method for reaction, and the utilization rate of raw materials is improved.
Fifth, the spiral liquid inlet channel, the dilute sulfuric acid liquid inlet pipe and the dilute ammonia water liquid inlet pipe are arranged, so that dilute sulfuric acid and dilute ammonia water flow on the spiral liquid inlet channel after entering the adjusting tower, are subjected to mixing reaction and then enter the bottom of the adjusting tower for aggregation, the arrangement can prevent the dilute sulfuric acid and the dilute ammonia water from aggregating respectively before slowly diffusing and mixing reaction after entering the adjusting tower, the reaction efficiency of the dilute sulfuric acid and the dilute ammonia water can be improved, and the wastewater treatment speed is increased.
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, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a first perspective view of the present invention;
FIG. 2 is a schematic perspective view of the present invention;
FIG. 3 is a top view of the primary adjustment assembly of the present invention;
FIG. 4 is a cross-sectional view taken along line A-A of FIG. 3;
FIG. 5 is a partial top view of the present invention;
fig. 6 is a cross-sectional view taken along line B-B of fig. 5.
Reference numerals:
the device comprises a PH adjusting mechanism 1, a primary adjusting component 11, an adjusting tower 111, a dilute sulfuric acid liquid inlet pipe 112, a dilute ammonia water liquid inlet pipe 113, an aeration disc 114, a vent pipe 115, a circulating air pump 116, a liquid outlet pipe 117, a liquid outlet pump 118, a precision adjusting component 12, an adjusting box 121, an adjusting liquid inlet pipe 122, an adjusting inlet pipe 123, a discharge pipe 124, a second control valve 125, a PH sensor 126, a high-efficiency filter 2, a precision filter 3, a module mechanism 4, a primary filter pipe 5, a filter conveying pump 6, a precision filter pipe 7, a drain pipe 8, a drain pipe 9, a first control valve 10 and a spiral liquid inlet channel 101.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention.
The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
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.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The embodiment of the invention provides a membrane method for recycling dilute sulfuric acid, which comprises the following steps:
s1: neutralization regulation; mixing dilute sulfuric acid and dilute ammonia water, and adjusting the pH value to completely convert the sulfuric acid into ammonium sulfate;
s2: precipitating and filtering; standing and precipitating the dilute ammonium sulfate solution generated in the step S1, then filtering the dilute ammonium sulfate solution to enable the dilute ammonium sulfate solution to become clear liquid, preparing filter residues generated by filtering into dry residues, and recycling the dry residues;
s3: processing a module; and (4) separating the clear liquid obtained in the step S2 by a two-stage membrane group to obtain a 12-20% concentrated ammonium sulfate solution, recovering the concentrated ammonium sulfate solution, and recovering clean water for industrial production.
Specifically, the dilute sulfuric acid and the dilute ammonia water in step S1 contain 1 to 5 wt% of sulfuric acid and 1 to 25 wt% of ammonia water, in terms of weight fraction.
Specifically, the pH value of the dilute sulfuric acid and ammonia water neutralized in the step S1 is adjusted to be in the range of 5-10.
Specifically, the dry slag in the step S2 has a solid content of 70-80% by weight.
Specifically, the ammonium sulfate solution in the step S3 contains 12 to 20 wt% of ammonium sulfate in terms of weight fraction; the TDS of the produced clean water is less than or equal to 500 mg/l.
Specifically, the membrane group treatment in the S3 step may be ultrafiltration, nanofiltration, reverse osmosis, electrodialysis, or the like.
The embodiment of the invention also provides a device for treating dilute sulfuric acid by membrane method resource, which is shown in fig. 1 to 6 and comprises a PH adjusting mechanism 1, a high-efficiency filter 2, a precision filter 3 and a module mechanism 4, wherein the PH adjusting mechanism 1, the high-efficiency filter 2, the precision filter 3 and the module mechanism 4 are sequentially communicated through pipelines, the PH adjusting mechanism 1 comprises a primary adjusting component 11 and two precision adjusting components 12, the two precision adjusting components 12 are respectively arranged at the side of the primary adjusting component 11, a primary filtering pipe 5 for communicating the primary adjusting component 12 and the high-efficiency filter 2 is arranged between the precision adjusting component 12 and the high-efficiency filter 2, a filtering and conveying pump 6 is arranged in the middle of the primary filtering pipe 5, a precision filtering pipe 7 for communicating the high-efficiency filter 2 and the precision filter 3 is arranged between the high-efficiency filter 2 and the precision filter 3, and a drain pipe 8 and a drain, and a first control valve 10 is arranged on each of the drain pipe 8 and the liquid discharge pipe 9.
The high-efficiency filter 2 and the precision filter 3 can be replaced by a surface filter, a dry slag device, a high-precision lamination filter, a novel ultrafiltration device, a high-efficiency centrifuge, a ceramic filter and the like, and are adjusted according to actual conditions;
specific working methods of the membrane group mechanism include but are not limited to ultrafiltration, nanofiltration, reverse osmosis, electrodialysis and the like.
The invention divides the PH adjusting mechanism 1 into a primary adjusting component 11 and two precise adjusting components 12 to adjust the dilute sulphuric acid and the dilute ammonia water twice, and aims to realize the continuous work of the dilute sulphuric acid and the dilute ammonia water under the alternate work of the two precise adjusting components 12 through the rough adjustment of the primary adjusting component 11 and improve the adjusting efficiency.
Specifically, the primary adjusting assembly 11 includes an adjusting tower 111, a dilute sulfuric acid liquid inlet pipe 112, a dilute ammonia water liquid inlet pipe 113, an aeration tray 114, an aeration pipe 115 and a circulating air pump 116, the dilute sulfuric acid liquid inlet pipe 112 and the dilute ammonia water liquid inlet pipe 113 are both arranged at the side of the adjusting tower 111, the aeration tray 114 is arranged at the bottom of the inner side of the adjusting tower 111, one end of the aeration pipe 115 is communicated with the aeration tray 114, the other end of the aeration pipe 115 is communicated with the upper end of the adjusting tower 111, the circulating air pump 116 is arranged at the middle part of the aeration pipe 115, a liquid outlet pipe 117 is arranged at the lower part of the adjusting tower 111, and a liquid outlet pump 118 is arranged at the middle part of the; during operation, dilute sulphuric acid gets into regulating tower 111 from dilute sulphuric acid feed liquor pipe 112, and simultaneously, dilute ammonia water gets into regulating tower 111 from dilute ammonia water feed liquor pipe 113, and the reaction between the two is neutralized, and simultaneously, carry the air on regulating tower 111 upper portion in aeration dish 114 through circulating air pump 116 and breather pipe 115, stir dilute sulphuric acid and dilute ammonia water, improve reaction efficiency, because the aqueous ammonia has volatility, consequently can carry the mixed liquid with volatile ammonia again and react through above-mentioned method, improve the utilization ratio of raw materials.
Specifically, a spiral liquid inlet channel 101 is arranged at the upper part of the inner side of the adjusting tower 111, one end of the dilute sulfuric acid liquid inlet pipe 112 is positioned above the upper end of the spiral liquid inlet channel 101, one end of the dilute ammonia water liquid inlet pipe 113 extends to the upper part of the middle part of the spiral liquid inlet channel 101, and the dilute sulfuric acid liquid inlet pipe 112 and the dilute ammonia water liquid inlet pipe 113 are both arranged along the tangent line of the adjusting tower 111; the spiral liquid inlet channel 101, the dilute sulfuric acid liquid inlet pipe 112 and the dilute ammonia water liquid inlet pipe 113 are arranged so that dilute sulfuric acid and dilute ammonia water flow on the spiral liquid inlet channel 101 after entering the regulating tower 111, the dilute sulfuric acid and the dilute ammonia water are subjected to mixed reaction and then enter the bottom of the regulating tower 111 for aggregation, the arrangement can prevent the dilute sulfuric acid and the dilute ammonia water from aggregating respectively before slowly diffusing and mixing reaction after entering the regulating tower 111, the reaction efficiency of the dilute sulfuric acid and the dilute ammonia water can be improved, and the wastewater treatment speed is increased.
Specifically, each precision adjusting assembly 12 includes an adjusting tank 121, an adjusting liquid inlet pipe 122, an adjusting inlet pipe 123 and a discharging pipe 124, the bottom of the inner side of the adjusting tank 121 is obliquely arranged, one end of the adjusting liquid inlet pipe 122 is communicated with the liquid outlet pipe 117, the other end of the adjusting liquid inlet pipe 122 extends to the middle of the adjusting tank 121, the adjusting inlet pipe 123 is arranged from the other end of the adjusting tank 121 toward the adjusting liquid inlet pipe 122, one end of the discharging pipe 124 is communicated with the adjusting tank 121, and the other end of the discharging pipe 124 is communicated with the primary filtering pipe 5, as shown in fig. 6, the influence on bottom layer precipitation caused by adding dilute ammonia water can be avoided, the adjusting liquid inlet pipe 122, the adjusting liquid inlet pipe 123 and the discharging pipe 124 are respectively provided with a second control valve 125, and a PH sensor 126 is arranged in each precision adjusting tank 121; after mixed liquid after the initial adjustment gets into in the regulating box 121, detect its pH value through pH sensor 126 to finely tune according to actual requirement, continue to let in weak ammonia water through adjusting the inlet pipe 123, until adjusting the pH value to appointed numerical value.
The first embodiment is as follows:
the invention relates to a working method of a device for membrane method resource treatment of dilute sulfuric acid, which comprises the following steps:
s1: introducing dilute sulfuric acid with the concentration of 2% and dilute ammonia water with the concentration of 20% into a primary adjusting component 11 for neutralization, adjusting the pH value, introducing the solution after reaction into a precise adjusting component 12, further precisely adjusting to completely convert the sulfuric acid into ammonium sulfate, and precipitating main impurities in the dilute sulfuric acid to generate precipitates in the precise adjusting component 12;
s2: sequentially feeding the dilute ammonium sulfate solution generated in the step S1 into a high-efficiency filter 2 and a precision filter 3 for filtering to enable the dilute ammonium sulfate solution to become clear liquid; preparing the filter residue generated by filtering into dry residue, and recovering;
s3: and (4) delivering the clear liquid obtained in the step (S2) to a membrane module mechanism 4, separating the clear liquid by two-stage membrane modules to obtain a 15% concentrated ammonium sulfate solution, recovering the concentrated ammonium sulfate solution, and recovering clean water for industrial production.
Specifically, in the step S1, the dilute sulfuric acid and the dilute ammonia water contain, by weight, 2 wt% of sulfuric acid and 20 wt% of ammonia water.
Specifically, the PH adjustment range for the neutralization of dilute sulfuric acid and ammonia water in step S1 is 5.5.
Specifically, the dry slag in the step S2 has a solid content of 80% by weight.
Specifically, the ammonium sulfate solution in step S3 contains, by weight, 15 wt% of ammonium sulfate; the TDS of the produced clean water is less than or equal to 500 mg/l.
Example two:
the invention relates to a working method of a device for membrane method resource treatment of dilute sulfuric acid, which comprises the following steps:
s1: leading dilute sulfuric acid with the concentration of 2% and dilute ammonia water with the concentration of 1% into a primary adjusting component 11 for neutralization, adjusting the pH value, leading the solution after reaction into a precise adjusting component 12, further precisely adjusting to ensure that the sulfuric acid is completely converted into ammonium sulfate, and generating precipitates from main impurities in the dilute sulfuric acid and precipitating in the precise adjusting component 12;
s2: sequentially feeding the dilute ammonium sulfate solution generated in the step S1 into a high-efficiency filter 2 and a precision filter 3 for filtering to enable the dilute ammonium sulfate solution to become clear liquid; preparing the filter residue generated by filtering into dry residue, and recovering;
s3: and (4) delivering the clear liquid obtained in the step (S2) to a membrane module mechanism 4, separating the clear liquid by two-stage membrane modules to obtain an 18% concentrated ammonium sulfate solution, recovering the concentrated ammonium sulfate solution, and recovering clean water for industrial production.
Specifically, in the step S1, the dilute sulfuric acid and the dilute ammonia water contain, by weight, 2 wt% of sulfuric acid and 1 wt% of ammonia water.
Specifically, the PH adjustment range for the neutralization of dilute sulfuric acid and ammonia water in step S1 is 6.
Specifically, the dry slag in the step S2 has a solid content of 75% by weight.
Specifically, the ammonium sulfate solution in step S3 contains, by weight, 18 wt% of ammonium sulfate; the TDS of the produced clean water is less than or equal to 500 mg/l.
Example three:
the invention relates to a working method of a device for membrane method resource treatment of dilute sulfuric acid, which comprises the following steps:
s1: introducing dilute sulfuric acid with the concentration of 2% and dilute ammonia water with the concentration of 10% into a primary adjusting component 11 for neutralization, adjusting the pH value, introducing the solution after reaction into a precise adjusting component 12, further precisely adjusting to completely convert the sulfuric acid into ammonium sulfate, and precipitating main impurities in the dilute sulfuric acid to generate precipitates in the precise adjusting component 12;
s2: sequentially feeding the dilute ammonium sulfate solution generated in the step S1 into a high-efficiency filter 2 and a precision filter 3 for filtering to enable the dilute ammonium sulfate solution to become clear liquid; preparing the filter residue generated by filtering into dry residue, and recovering;
s3: and (4) delivering the clear liquid obtained in the step (S2) to a membrane module mechanism 4, separating the clear liquid by two-stage membrane modules to obtain a 20% concentrated ammonium sulfate solution, recovering the concentrated ammonium sulfate solution, and recovering clean water for industrial production.
Specifically, in the step S1, the dilute sulfuric acid and the dilute ammonia water contain, by weight, 2 wt% of sulfuric acid and 10 wt% of ammonia water.
Specifically, the PH adjustment range for the neutralization of dilute sulfuric acid and ammonia water in step S1 is 9.
Specifically, the dry slag in the step S2 has a solid content of 70 wt% in terms of weight fraction.
Specifically, the ammonium sulfate solution in step S3 contains 20 wt% of ammonium sulfate in terms of weight fraction; the TDS of the produced clean water is less than or equal to 500 mg/l.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A membrane method resource treatment dilute sulphuric acid method is characterized in that; the method comprises the following steps:
s1: neutralization regulation; mixing dilute sulfuric acid and dilute ammonia water, and adjusting the pH value to completely convert the sulfuric acid into ammonium sulfate;
s2: precipitating and filtering; standing and precipitating the dilute ammonium sulfate solution generated in the step S1, then filtering the dilute ammonium sulfate solution to enable the dilute ammonium sulfate solution to become clear liquid, preparing filter residues generated by filtering into dry residues, and recycling the dry residues;
s3: processing a membrane group; and (4) separating the clear liquid obtained in the step S2 by using a multi-stage membrane group to obtain a 12-20% concentrated ammonium sulfate solution, recovering the concentrated ammonium sulfate solution, and recovering clean water for industrial production.
2. The membrane method resource treatment method for dilute sulfuric acid according to claim 1, characterized in that: the dilute sulfuric acid and the dilute ammonia water in the step S1 comprise 1-5 wt% of sulfuric acid and 1-25 wt% of ammonia water by weight.
3. The membrane method resource treatment method for dilute sulfuric acid according to claim 1, characterized in that: and the pH value adjustment range of the neutralization of the dilute sulfuric acid and the ammonia water in the step S1 is 5-10.
4. The membrane method resource treatment method for dilute sulfuric acid according to claim 1, characterized in that: the dry slag in the step S2 has a solid content of 70-80 wt% in terms of weight fraction.
5. The membrane method resource treatment method for dilute sulfuric acid according to claim 1, characterized in that: the weight percentage of the ammonium sulfate solution in the step S3 is 12-20 wt%; the TDS of the produced clean water is less than or equal to 500 mg/l.
6. The membrane method resource treatment method for dilute sulfuric acid according to claim 1, characterized in that: the membrane group treatment in the S3 step may be ultrafiltration, nanofiltration, reverse osmosis, electrodialysis, or the like.
7. The utility model provides a device of membrane method resourceful treatment dilute sulphuric acid which characterized in that: comprises a PH adjusting mechanism (1), a high-efficiency filter (2), a precision filter (3) and a membrane group mechanism (4), wherein the PH adjusting mechanism (1), the high-efficiency filter (2), the precision filter (3) and the membrane group mechanism (4) are sequentially communicated through a pipeline, the PH adjusting mechanism (1) comprises a primary adjusting component (11) and two precision adjusting components (12), the two precision adjusting components (12) are arranged at the side of the primary adjusting component (11), a primary filtering pipe (5) used for communicating the primary adjusting component and the high-efficiency filter (2) is arranged between the precision adjusting components (12) and the high-efficiency filter (2), a filtering conveying pump (6) is arranged in the middle of the primary filtering pipe (5), a precision filtering pipe (7) used for communicating the primary adjusting component and the high-efficiency filter (3) is arranged between the high-efficiency filter (2) and the precision filter (3), a drainage pipe (8) and a drainage pipe (9), and the drain pipe (8) and the drain pipe (9) are respectively provided with a first control valve (10).
8. The device for membrane-process resource treatment of dilute sulfuric acid according to claim 7, characterized in that: elementary regulation subassembly (11) are including regulating tower (111), dilute sulfuric acid feed liquor pipe (112), dilute ammonia water feed liquor pipe (113), aeration dish (114), breather pipe (115) and circulating air pump (116), dilute sulfuric acid feed liquor pipe (112) and dilute ammonia water feed liquor pipe (113) all set up the side at regulating tower (111), aeration dish (114) set up the bottom in regulating tower (111) inboard, the one end and the aeration dish (114) intercommunication of breather pipe (115), the other end and the upper end intercommunication of regulating tower (111) of breather pipe (115), circulating air pump (116) set up the middle part at breather pipe (115), the lower part of regulating tower (111) is equipped with drain pipe (117), the middle part of drain pipe (117) is equipped with drain pump (118).
9. The device for membrane-process resource treatment of dilute sulfuric acid according to claim 8, characterized in that: the upper portion of adjusting tower (111) inboard is equipped with spiral inlet channel (101), the one end of dilute sulphuric acid feed liquor pipe (112) is located the top of spiral inlet channel (101) upper end, the top at spiral inlet channel (101) middle part is extended to the one end of weak aqua ammonia feed liquor pipe (113), dilute sulphuric acid feed liquor pipe (112) and weak aqua ammonia feed liquor pipe (113) all set up along the tangent line of adjusting tower (111).
10. The device for membrane-process resource treatment of dilute sulfuric acid according to claim 8, characterized in that: every precision adjusting assembly (12) is including regulating box (121), regulation feed liquor pipe (122), regulation inlet pipe (123) and discharge pipe (124), regulating box (121) inboard bottom is the slope setting, the one end and drain pipe (117) the intercommunication of adjusting feed liquor pipe (122), the other end of adjusting feed liquor pipe (122) extends to the middle part of regulating box (121), adjust inlet pipe (123) and adjust feed liquor pipe (122) setting from the other end orientation of regulating box (121), the one end and the regulating box (121) intercommunication of discharge pipe (124), the other end and the elementary filter tube (5) intercommunication of discharge pipe (124), all be equipped with second control valve (125) on adjusting feed liquor pipe (122), regulation inlet pipe (123) and discharge pipe (124), every all be equipped with PH sensor (126) in precision adjusting box (121).
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| US3935100A (en) * | 1973-06-29 | 1976-01-27 | Institut Francais Du Petrole | Process for the treatment of waste waters containing sulfuric acid and/or ammonium sulfate |
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|---|---|---|---|---|
| US3935100A (en) * | 1973-06-29 | 1976-01-27 | Institut Francais Du Petrole | Process for the treatment of waste waters containing sulfuric acid and/or ammonium sulfate |
| CN103663774A (en) * | 2013-02-27 | 2014-03-26 | 苏州信望膜技术有限公司 | Method for treating low-concentration ammonia-containing wastewater by use of membrane separation technology |
| CN103803754A (en) * | 2013-03-12 | 2014-05-21 | 浙江迪邦化工有限公司 | Method and device for processing dye acid waste water |
| CN103332821A (en) * | 2013-06-21 | 2013-10-02 | 浙江吉华集团股份有限公司 | Method for treating waste water containing sulfuric acid in production process of dyes and intermediates |
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