A medicament for treating wastewater containing perchlorate

Abstract

The present application provides a kind of medicament for treating waste water containing perchlorate, it consists of two parts of targeted removal agent and guide activator, the core component of the targeted removal agent includes dodecyl trimethylammonium chloride, dodecyl dimethyl benzyl ammonium chloride, hexadecyl trimethylammonium chloride, octadecyl trimethylammonium chloride and the like.The guide activator includes one or more of polymeric ferric sulfate, polymeric ferric chloride, polymeric aluminum ferric chloride, polymeric aluminum ferric silicate.The treatment medicament component of the present application is simple, wherein a large number of high perchlorate ion groups contained therein can be fully combined with perchlorate in waste water, and perchlorate is precipitated from water in the form of precipitation, and then separated and removed, with a removal rate of more than 95% in one step.

Description

[0001] The present application is a divisional application.

[0002] Parent application number: 2024116644017

[0003] Parent application date: November 20, 2024

[0004] Parent invention title: A perchlorate-containing wastewater treatment agent and a treatment method TECHNICAL FIELD

[0005] The present application belongs to the technical field of perchlorate-containing wastewater treatment, and particularly relates to a reagent for treating wastewater containing perchlorate. BACKGROUND

[0006] Perchlorate is a typical persistent inorganic pollutant, with characteristics of high stability, fast diffusion, easy solubility, and difficult degradation. Perchlorate is widely used in the fields of fireworks manufacturing, military manufacturing, fuel production, and textile printing and dyeing. A large amount of wastewater and waste containing perchlorate is generated in these industrial processes, which has a high risk of environmental pollution. Perchlorate can interfere with the normal function of the human thyroid gland, competitively inhibit the absorption of iodide by the thyroid gland, and cause a decrease in thyroid hormone secretion, hindering metabolism or growth and development. Therefore, industrial wastewater containing perchlorate has entered the strict control field. The Hunan Provincial Standard "Industrial Wastewater Perchlorate Pollutant Discharge Standard" (DB43 / 3001-2024) clearly stipulates that the discharge limit value of perchlorate pollutants is 0.7 mg / L. In addition, the "Drinking Water Health Standard" (GB 5749-2022) first includes perchlorate in the control requirements, clearly stipulating that the detection limit value of perchlorate in drinking water is 0.07 mg / L.

[0007] Currently, the main methods for treating perchlorate-containing wastewater are chemical catalytic reduction, biological method, adsorption method, and membrane treatment method. Although these methods have high removal efficiency, they still have technical defects. For example, the chemical catalytic reduction method has high treatment cost, harsh reaction conditions, and long treatment time, making it difficult to promote; the biological method has a long bacteria cultivation period and requires the addition of a large amount of carbon source, which has a large lag in response to fluctuations in wastewater quality and requires high technical requirements for operators; the adsorbent adsorption method and the membrane treatment method produce high-concentration perchlorate regeneration liquid or concentrated liquid, which is difficult to dispose of subsequently, and often requires some modification methods and steps to modify the adsorbent to improve the treatment effect.

[0008] CN118545874A discloses a purification treatment method for perchlorate-containing wastewater, comprising the following steps:

[0009] (1) adding ferrous medicament into high-concentration perchlorate wastewater, wherein the concentration of perchlorate in the high-concentration perchlorate wastewater is 300 mg / L-2000 mg / L, then adding a reducing agent, stirring and reacting, adjusting the pH value to 1-4, continuing to react, and obtaining a reduced liquid after the reaction is completed;

[0010] (2) adjusting the pH value of the obtained reduced liquid to 6-10, filtering to obtain a first filtrate and a first filter residue; filtering low-concentration perchlorate wastewater, wherein the concentration of perchlorate in the low-concentration perchlorate wastewater is 0.1 mg / L-100 mg / L, to obtain a second filtrate and a second filter residue;

[0011] (3) mixing the obtained first filtrate and second filtrate, adsorbing with ion exchange resin to obtain a treated liquid, wherein the concentration of perchlorate in the treated liquid is <0.07 mg / L, and the purification treatment is completed.

[0012] The above method mainly treats perchlorate from the process improvement, and the medicaments used are existing medicaments, the treatment process is complex, and the treatment cost is relatively high.

[0013] Therefore, it is necessary to provide a high-efficiency and low-cost, simple and easy-to-operate perchlorate wastewater treatment medicament and treatment method to solve the above problems. SUMMARY

[0014] The purpose of the present application is to solve the problems of high operating cost, difficult popularization and difficult disposal of high-concentration perchlorate regeneration liquid in the existing perchlorate wastewater treatment technology, and to provide a high-efficiency and wide-concentration-range perchlorate wastewater treatment medicament and application.

[0015] The technical scheme of the present application is:

[0016] A medicament for treating wastewater containing perchlorate is composed of two parts of targeted removal agent and guided activation agent, the targeted removal agent is referred to as component A, and the guided activation agent is referred to as component B, which is selected from any one of the following four schemes:

[0017] Component A is: dodecyltrimethylammonium chloride 38 parts, isopropyl alcohol 3 parts, sodium metaaluminate 4 parts, and water 55 parts, and component B is: polyaluminum chloride aqueous solution with a mass concentration of 25%; the targeted removal agent and the guided activation agent are stored separately before use, and the dosage ratio of the targeted removal agent to the guided activation agent is 5.5 ml / L:1.5 ml / L when used;

[0018] Alternatively, the A component is: cetyl trimethyl ammonium chloride 28 parts, ethanol 3 parts, aluminum sulfate 4 parts, water 65 parts; the B component is: polymeric ferric chloride aqueous solution with a mass concentration of 25%; the targeted removing agent and the guiding activator are separately stored before use, and when used, the dosing amount ratio of the targeted removing agent and the guiding activator is: targeted removing agent: guiding activator = 4ml / L: 1ml / L;

[0019] Alternatively, the A component is: octadecyl trimethyl ammonium chloride 33 parts, ethanol 4 parts, sodium metaaluminate 3 parts, water 60 parts; the B component is: polymeric aluminum ferric chloride aqueous solution with a mass concentration of 25%; the targeted removing agent and the guiding activator are separately stored before use, and when used, the dosing amount ratio of the targeted removing agent and the guiding activator is: targeted removing agent: guiding activator = 4ml / L: 1ml / L;

[0020] Alternatively, the A component is: dodecyl dimethyl benzyl ammonium chloride 20 parts, double decyl dimethyl ammonium chloride 25 parts, ethanol 4 parts, aluminum sulfate 5 parts, water 46 parts; the B component is: polymeric ferric sulfate aqueous solution with a mass concentration of 25%; the targeted removing agent and the guiding activator are separately stored before use, and when used, the dosing amount ratio of the targeted removing agent and the guiding activator is: targeted removing agent: guiding activator = 4ml / L: 1.5ml / L.

[0021] The above four kinds of perchlorate wastewater treatment agents can be supported by the embodiments 5, 7, 8 and 10 in the specification.

[0022] One of the technical solutions of the present application is a perchlorate wastewater treatment agent, which is composed of a targeted removing agent and a guiding activator:

[0023] The targeted removing agent, referred to as the A component, the core component of the A component includes one or more of octyl trimethyl ammonium chloride, tricaprylylmethylammonium chloride, benzyl trimethyl ammonium chloride, decyl trimethyl ammonium chloride, double decyl dimethyl ammonium chloride, dodecyl trimethyl ammonium bromide, dodecyl bis-hydroxyethyl methyl ammonium chloride, tetradecyl trimethyl ammonium chloride, tetradecyl trimethyl ammonium bromide, cetyl trimethyl ammonium bromide, cetyl pyridinium chloride, octadecyl dimethyl benzyl ammonium chloride, dioctadecyldimethylammonium chloride, behenyl trimethyl ammonium chloride, octyl decyl dimethyl ammonium chloride, polydimethyl diallyl ammonium chloride, octadecyl trimethyl ammonium bromide, dodecyl trimethyl ammonium bromide;

[0024] The guiding activator, referred to as the B component, the B component includes one or more of polymeric ferric sulfate, polymeric ferric chloride, polymeric aluminum ferric chloride, polymeric aluminum ferric sulfate.

[0025] Preferably, the targeted removal agent further includes a dispersant, and the amount of the dispersant is based on parts by weight, and the relationship between the amount of the dispersant and the amount of the core component is: 20-50 parts of the core component and 3-10 parts of the dispersant.

[0026] Preferably, the targeted removal agent further includes an accelerator, and the amount of the accelerator is based on parts by weight. The relationship between the amount of the accelerator and the amount of the core component is: 20-50 parts of the core component and 3-10 parts of the accelerator.

[0027] The combination of the core components, dispersant, and accelerator results in a more effective and efficient targeted removal agent.

[0028] Preferably, the dispersant includes one or more of methanol, ethanol, and isopropanol.

[0029] Preferably, the accelerator includes one or more of aluminum sulfate, aluminum chloride, sodium aluminate, and alum.

[0030] Preferably, the preparation method of the targeted removal agent is as follows: mix and stir the substances in component A with water to obtain an aqueous solution of component A with a mass concentration of 30%-70%.

[0031] Preferably, the guiding activator is an aqueous solution of component B with a mass concentration of 5%-35%.

[0032] The targeted removal agent and the guiding activator are stored separately before use. When using them, the preferred mass ratio of the targeted removal agent and the guiding activator is: targeted removal agent: guiding activator = 1-6:1.

[0033] This invention also provides a method for treating perchlorate wastewater, using the above-mentioned treatment agent, specifically including the following steps:

[0034] S1. Add an aqueous solution of component A to the wastewater at a weight ratio of perchlorate content to component A aqueous solution of 0.03-0.13:1, and stir to react.

[0035] S2. After mixing the wastewater obtained in step S1 with the aqueous solution of component B, the weight ratio of component A to component B is 1-6:1, and the mixture is stirred and reacted.

[0036] S3. Adjust the pH of the mixture after step S2 to 6.0~9.0, and stir the reaction.

[0037] S4. Mix the mixture after the reaction in step S3 with the flocculant and stir the mixture under the condition of pH 6.0~9.0. After liquid-solid separation, the clear liquid obtained is the effluent of the primary treatment, which can also be used as recycled water for production reuse.

[0038] Preferably, step S5 is also included:

[0039] S5. The primary treated effluent obtained in step S4 is fed into a fixed-bed adsorption column filled with perchlorate selective adsorption resin using an intermediate booster pump for deep adsorption treatment. The resulting effluent is the treated effluent that meets the standards. The waste liquid generated during the regeneration process of the perchlorate selective adsorption resin can be removed using the above steps S1-S4.

[0040] In the above processing method, preferably, in step S1, the stirring reaction time is 10~40 min.

[0041] Preferably, in step S2, the mass concentration of the aqueous solution of component B is 5-20%; and the stirring reaction time is 10-40 min.

[0042] Preferably, in step S3, the pH value of the mixture after the reaction in step S2 is adjusted using calcium hydroxide solution, sodium hydroxide solution, or sodium carbonate solution.

[0043] Preferably, in step S3, the stirring reaction time is 10-40 min.

[0044] Preferably, in step S4, the mass concentration of the flocculant is 0.1% to 0.3%; and the stirring reaction time is 8 to 30 minutes. The flocculant includes an aqueous solution of polyacrylamide, microbial flocculant, composite flocculant, etc.

[0045] Preferably, in step S4, the liquid-solid separation method includes one of three: sedimentation, flotation, or filtration.

[0046] The principle of this invention:

[0047] The treatment agent of this invention has a simple composition. The core component of the targeted removal agent is commercially available. It is not used as an adsorbent or a modifier for conventional adsorbents, but rather as a precipitant. Its numerous perchlorate-loving ionic groups can fully combine with perchlorate ions in wastewater, precipitating them out for separation and removal, achieving a one-step removal rate of over 95%. The guiding activator fully activates the core component, enabling it to participate in the precipitation reaction and separating perchlorate ions from the water as precipitates. Adding a dispersant to the targeted removal agent promotes the dissociation and reactivity of the functional groups of the core component, accelerating the precipitation reaction. Adding a promoter promotes the aggregation of the precipitate particles, reducing sedimentation time by agglomerating small particles into larger ones. This invention is applicable to perchlorate wastewater of varying concentrations. The appropriate dosage can be selected based on the perchlorate content in the wastewater, reducing agent costs while maximizing the removal of perchlorate components.

[0048] Compared with the prior art, the beneficial effects of the present invention are:

[0049] 1. The perchlorate wastewater treatment agent of the present invention has simple components, inexpensive and readily available raw materials, and a simple preparation method, and can be mass-produced industrially.

[0050] 2. The perchlorate wastewater treatment agent of the present invention has a high perchlorate removal efficiency, with a one-step removal rate of over 95%. Combined with the fixed-bed deep adsorption treatment of the perchlorate selective adsorption resin, it is suitable for the removal of perchlorate wastewater of different concentrations. The treatment effect is stable, the treatment conditions are easy to achieve at room temperature and pressure, the operation is simple, and it has high promotion value.

[0051] 3. The addition of the reagent of this invention during the pretreatment process can effectively remove more than 95% of perchlorate, thus reducing the load on the ion exchange resin in the subsequent deep treatment module, allowing it to function for a longer period without frequent regeneration, and greatly saving the treatment cost of perchlorate wastewater.

[0052] 4. The waste liquid generated during the regeneration process of the perchlorate selective adsorption resin in this invention can be removed by the above steps S1-S4, so there is no problem of treating the regenerated concentrate. Detailed Implementation

[0053] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0054] Unless otherwise stated, all reagents, materials and equipment used in this invention are commercially available or prepared by existing methods.

[0055] Example 1

[0056] A perchlorate wastewater treatment agent consists of two parts: a targeted removal agent and a guiding activator.

[0057] The targeted removal agent is an aqueous solution of hexadecylpyridine chloride with a mass concentration of 40%, referred to as component A;

[0058] The guiding activator is an aqueous solution of polyferric sulfate with a mass concentration of 25%, referred to as component B.

[0059] Component A and Component B should be stored separately.

[0060] The method of using the above-mentioned medicine includes the following steps:

[0061] S1. Add component A to the wastewater at a ratio of perchlorate content to component A aqueous solution of 0.07:1 (by weight), and stir for 40 minutes. The wastewater is perchlorate wastewater from a firecracker manufacturing company in Liuyang City, with raw water containing ClO4. - The concentration was 71.3 mg / L.

[0062] S2. After mixing the wastewater obtained in step S1 with the aqueous solution of component B, the ratio of component A to component B is 5:1, and the mixture is stirred for 40 min.

[0063] S3. Adjust the pH of the mixture after step S2 to 7.0 and stir for 10 min.

[0064] S4. Mix the mixture from step S3 with an aqueous solution of polyacrylamide, and stir for 10 min at pH 7.0. After liquid-solid separation, the clear liquid obtained is the primary effluent. Detect the ClO4 in the effluent. - The concentration is 3.06 mg / L. The primary effluent can also be reused in production.

[0065] S5. Using an intermediate booster pump, the primary treated effluent obtained in step S4 is passed into a fixed-bed adsorption column filled with perchlorate selective adsorption resin (specifically, the special resin from Tianjin Xinyue Huamei Environmental Protection Co., Ltd.) for deep adsorption treatment. The ClO4 content of the effluent is then measured. - The concentration is 0.02 mg / L (<0.70 mg / L). The resulting effluent is the treated effluent that meets the standards. The waste liquid generated during the regeneration process of the perchlorate selective adsorption resin can be removed using the steps S1-S4 described above.

[0066] Example 2

[0067] A perchlorate wastewater treatment agent consists of two parts: a targeted removal agent and a guiding activator.

[0068] The targeted removal agent is an aqueous solution of 30% tetradecyltrimethylammonium bromide and 3% ethanol, referred to as component A;

[0069] The guiding activator is an aqueous solution of polyferric chloride with a mass concentration of 20%, referred to as component B.

[0070] Component A and Component B should be stored separately.

[0071] The method of using the above-mentioned medicine includes the following steps:

[0072] S1. Add component A to the wastewater at a ratio of perchlorate content to component A aqueous solution of 0.05:1 (by weight), and stir for 35 minutes. The wastewater is perchlorate wastewater from a firecracker manufacturing company in Liuyang City, with raw water containing ClO4. - The concentration was 71.3 mg / L.

[0073] S2. After mixing the wastewater obtained in step S1 with the aqueous solution of component B, the ratio of component A to component B is 4:1, and the mixture is stirred for 25 min.

[0074] S3. Adjust the pH of the mixture after step S2 to 8.0 and stir for 15 min.

[0075] S4. Mix the mixture from step S3 with an aqueous solution of polyacrylamide, and stir for 10 min at pH 8.0. After liquid-solid separation, the clear liquid obtained is the primary effluent. Detect the ClO4 in the effluent. - The concentration is 2.51 mg / L. The primary effluent can also be reused in production.

[0076] S5. Using an intermediate booster pump, the primary treated effluent obtained in step S4 is passed into a fixed-bed adsorption column filled with perchlorate selective adsorption resin (specifically, the special resin from Tianjin Xinyue Huamei Environmental Protection Co., Ltd.) for deep adsorption treatment. The ClO4 content of the effluent is then measured. - The concentration is 0.03 mg / L (<0.70 mg / L). The resulting effluent is the treated effluent that meets the standards. The waste liquid generated during the regeneration process of the perchlorate selective adsorption resin can be removed using the steps S1-S4 described above.

[0077] Example 3

[0078] A perchlorate wastewater treatment agent consists of two parts: a targeted removal agent (component A) and a guiding activator (component B). The preparation method of component A is the same as in Example 1. Component A consists of 45 parts of didecyldimethylammonium chloride, 3 parts of ethanol, 3 parts of aluminum chloride, and 49 parts of water.

[0079] Example 4

[0080] A perchlorate wastewater treatment agent consists of two parts: a targeted removal agent (component A) and a guiding activator (component B). The preparation method of component A is the same as in Example 1. Component A consists of 34 parts of dodecyl dimethyl benzyl ammonium chloride, 5 parts of methanol, 7 parts of aluminum sulfate, and 54 parts of water.

[0081] Example 5

[0082] A perchlorate wastewater treatment agent consists of two parts: a targeted removal agent (component A) and a guiding activator (component B). The preparation method of component A is the same as in Example 1. Component A consists of: 38 parts of dodecyltrimethylammonium chloride, 3 parts of isopropanol, 4 parts of sodium aluminate, and 55 parts of water.

[0083] Example 6

[0084] A perchlorate wastewater treatment agent consists of two parts: a targeted removal agent (component A) and a guiding activator (component B). The preparation method of component A is the same as in Example 1. Component A consists of 50 parts of dodecyl dihydroxyethyl methyl ammonium chloride, 4 parts of methanol, 5 parts of aluminum chloride, and 41 parts of water.

[0085] Example 7

[0086] A perchlorate wastewater treatment agent consists of two parts: a targeted removal agent (component A) and a guiding activator (component B). The preparation method of component A is the same as in Example 1. Component A consists of 28 parts of hexadecyltrimethylammonium chloride, 3 parts of ethanol, 4 parts of aluminum sulfate, and 65 parts of water.

[0087] Example 8

[0088] A perchlorate wastewater treatment agent consists of two parts: a targeted removal agent (component A) and a guiding activator (component B). The preparation method of component A is the same as in Example 1. Component A consists of 33 parts of octadecyltrimethylammonium chloride, 4 parts of ethanol, 3 parts of sodium aluminate, and 60 parts of water.

[0089] Example 9

[0090] A perchlorate wastewater treatment agent consists of two parts: a targeted removal agent (component A) and a guiding activator (component B). The preparation method of component A is the same as in Example 1. Component A consists of 50 parts of dioctadecyl dimethyl ammonium chloride, 10 parts of methanol, 7 parts of aluminum chloride, and 33 parts of water.

[0091] Example 10

[0092] A perchlorate wastewater treatment agent consists of two parts: a targeted removal agent (component A) and a guiding activator (component B). The preparation method of component A is the same as in Example 1. Component A consists of: 20 parts of dodecyl dimethyl benzyl ammonium chloride, 25 parts of didecyl dimethyl ammonium chloride, 4 parts of ethanol, 5 parts of aluminum sulfate, and 46 parts of water.

[0093] Example 11

[0094] A perchlorate wastewater treatment agent comprises two parts: a targeted removal agent (component A) and a guiding activator (component B). Component A is prepared using the same method as in Example 1, and comprises: 30 parts hexadecyltrimethylammonium bromide, 12 parts octadecyltrimethylammonium chloride, 5 parts ethanol, 4 parts alum, and 49 parts water. Performance tests were conducted on the perchlorate wastewater treatment agent prepared according to this invention. The raw water used in the water treatment experiment was taken from the effluent of a three-stage sedimentation tank of a fireworks factory in Liuyang City. The raw water contained ClO4. - It is 260 mg / L.

[0095] The method of using the above-mentioned medicine includes the following steps:

[0096] S1. Add component A to the wastewater at a ratio of perchlorate content to component A aqueous solution of 0.03-0.13:1 (by weight). See Table 1 for specific dosages. Stir and react for 10 minutes.

[0097] S2. Mix the wastewater obtained in step S1 with the aqueous solution of component B (the amount is shown in Table 1), and stir for 10 min.

[0098] S3. Adjust the pH of the mixture after step S2 to 8.3 and stir for 10 min.

[0099] S4. Mix the mixture from step S3 with an aqueous solution of polyacrylamide, and stir for 8 minutes at pH 8.3. After liquid-solid separation, the clear liquid obtained is the primary effluent. Detect the ClO4 in the effluent. - As shown in Table 1, the primary effluent can also be reused in production.

[0100] S5. Using an intermediate booster pump, the primary treated effluent obtained in step S4 is passed into a fixed-bed adsorption column filled with perchlorate selective adsorption resin (specifically, the special resin from Tianjin Xinyue Huamei Environmental Protection Co., Ltd.) for deep adsorption treatment. The ClO4 content of the effluent is then measured. - See Table 1. The obtained effluent is the treated effluent that meets the standards. The waste liquid generated during the regeneration process of the perchlorate selective adsorption resin can be removed using the steps S1-S4 described above.

[0101] Wastewater treatment experiments were conducted using the targeted removal agents (component A) prepared in Examples 3-11, and the ClO4 levels before and after treatment were measured. - Concentrations, and the results are shown in Table 1.

[0102] Table 1. Concentration of pollutants in the treated water.

[0103]

[0104] Note: All components B above are aqueous solutions with a mass concentration of 25%.

[0105] Experimental results:

[0106] According to the experimental data in Table 1 of the present invention, after treatment steps S1-S4, the perchlorate removal rates in the wastewater reached 94.7%, 96.6%, 94.2%, 94.5%, 97.1%, 97.3%, 95.2%, 98.0%, and 97.3%, respectively. After further deep adsorption treatment with a fixed-bed perchlorate selective adsorption resin, the perchlorate concentration was further reduced to meet the standards.

[0107] Comparative Example

[0108] Step 5 is excluded. Commonly used adsorbent modifiers such as sodium dodecyl sulfonate, tributyl phosphate, aluminum sulfate, sodium humate, and polyethyleneimine are used to replace component A (each with a mass concentration of 20%). Component B is a 25% polyferric chloride solution. The treatment method is the same as in Example 1. The treatment target is the effluent from the tertiary sedimentation tank of a fireworks factory in Liuyang City. The raw water contains ClO4. - The concentration was 260 mg / L. After treatment with different reagents, the results are shown in Table 2. It can be seen that ClO4... - Almost no effective removal was achieved because conventional adsorption modifiers are ineffective against ClO4. - It has no adsorption or removal effect whatsoever.

[0109] Table 2 Comparison of Results

[0110]

[0111] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and concept of the present invention, should be covered within the scope of protection of the claims of the present invention.

Claims

1. A reagent for treating wastewater containing perchlorate, comprising two parts: a targeted removal agent and a guiding activator, wherein the targeted removal agent is referred to as component A and the guiding activator is referred to as component B, characterized in that, Choose from any one of the following four options: Component A consists of: 38 parts dodecyltrimethylammonium chloride, 3 parts isopropanol, 4 parts sodium aluminate, and 55 parts water; Component B consists of: a 25% (w / w) aqueous solution of polyferric chloride. The targeted removal agent and the guiding activator are stored separately before use. When using them, the dosage ratio of the targeted removal agent and the guiding activator is: targeted removal agent: guiding activator = 5.5 ml / L: 1.5 ml / L. Alternatively, component A consists of: 28 parts hexadecyltrimethylammonium chloride, 3 parts ethanol, 4 parts aluminum sulfate, and 65 parts water; component B consists of: a 25% (w / w) aqueous solution of polyferric chloride. The targeted removal agent and the guiding activator are stored separately before use. When using them, the dosage ratio of the targeted removal agent and the guiding activator is: targeted removal agent: guiding activator = 4 ml / L: 1 ml / L. Alternatively, component A consists of: 33 parts octadecyltrimethylammonium chloride, 4 parts ethanol, 3 parts sodium aluminate, and 60 parts water; component B consists of: a 25% (w / w) aqueous solution of polyaluminum ferric chloride; the targeted removal agent and the guiding activator are stored separately before use, and when used, the dosage ratio of the targeted removal agent and the guiding activator is: targeted removal agent: guiding activator = 4 ml / L: 1 ml / L; Alternatively, component A consists of: 20 parts dodecyl dimethyl benzyl ammonium chloride, 25 parts didecyl dimethyl ammonium chloride, 4 parts ethanol, 5 parts aluminum sulfate, and 46 parts water; component B consists of: a 25% (w / w) aqueous solution of polyferric sulfate; the targeted removal agent and the guiding activator are stored separately before use, and when used, the dosage ratio of the targeted removal agent and the guiding activator is: targeted removal agent: guiding activator = 4 ml / L: 1.5 ml / L.

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