Algaecide for removing lead in complex high-salt water as well as preparation method and application of algaecide

Abstract

The invention discloses an algaecide for removing lead in complex high-salt water. The algaecide is prepared from the following components in parts by weight: 0.1-2 parts of montmorillonite, 2-4 parts of sodium alginate, 1-5 parts of calcium chloride and 2-4 parts of algae mud. The preparation method of the algicide comprises the following steps: adding montmorillonite into water to prepare a uniform suspension, and then adding algae mud to obtain a microalgae montmorillonite mixed suspension with the solid-to-liquid ratio of 0.0025-0.1 g / mL; sodium alginate is added into water, a uniform viscous solution with the concentration of 0.0085-0.067 g / mL is obtained under the heating condition, and the uniform viscous solution and the microalgae montmorillonite mixed suspension are uniformly stirred to obtain gel homogenization; and the gel is homogenized and dropped into a CaCl2 aqueous solution, and curing, filtering, washing and drying are performed to obtain the algicide. According to the method, the chlorella-montmorillonite-sodium alginate gel balls are prepared from the chlorella-containing algae mud, so that the survival time of the chlorella in the complex high-salt water is ensured, the method has extremely high removal rate and stability on lead in the complex high-salt water, and meanwhile, the chlorella-montmorillonite-sodium alginate gel balls are easy to separate and reuse.

Description

Technical Field

[0001] The present invention belongs to the technical field of wastewater treatment, and particularly relates to an algal agent for treating lead in complex high-salt water, a preparation method thereof, and an application thereof. Background Art

[0002] With the continuous growth of the economy and the rapid development of industrial production, a large amount of high-salt wastewater is generated. Common sources of high-salt wastewater are as follows: First, seawater used for daily life becomes saline domestic wastewater; Second, seawater used for coastal industrial production is discharged as wastewater; Third, saline wastewater generated during industrial production, which is also the main source. Industrial wastewater mainly contains organic matter and inorganic salts, with complex components. In addition, it is also accompanied by harmful substances such as heavy metals, cyanides, and radioactive elements and other pollutants. When these pollutants enter the environment, they will bring a series of serious problems to ecological safety and human safety.

[0003] Complex high-salt water generated by mining activities, industrial activities such as batteries and printing and dyeing, agricultural activities such as fertilizer application, and most other human activities often contains heavy metal lead. Lead can enter the natural cycle through various channels such as the atmosphere, water bodies, and solid waste. Humans can be exposed to lead through inhalation, ingestion, and skin contact, which can cause irreversible effects on organs such as the developing nerves, cardiovascular system, and kidneys.

[0004] Currently, the main pollution control technologies for lead in wastewater are as follows: chemical precipitation method, adsorption method, electrochemistry method, ion exchange method, membrane separation method, and biological treatment, etc. Although methods such as chemical precipitation and ion exchange can well treat lead in wastewater, there are problems such as being prone to cause secondary pollution or high cost; Although the microbial method is more environmentally friendly and sustainable, traditional biological treatment methods have disadvantages such as poor stability and difficulty in separation and recovery. Especially for high-salt wastewater with complex components, how to provide a lead removal method with green efficiency, low cost, and less secondary pollution has become an urgent technical problem to be solved. Summary of the Invention

[0005] The purpose of the present invention is to provide an algal agent for treating lead in complex high-salt water and a preparation method thereof. By preparing an algal sludge containing Chlorella into a Chlorella-montmorillonite-sodium alginate gel ball, the survival time of Chlorella in complex high-salt water is ensured, and it has an extremely high removal rate and stability for lead in complex high-salt water, and is easy to separate and reuse.

[0006] To achieve the above object, the following technical solutions are adopted:

[0007] An algal agent for removing lead from complex high-salt water, the composition of which by weight parts includes:

[0008] Montmorillonite: 0.1 - 2 parts, sodium alginate: 2 - 4 parts, calcium chloride: 1 - 5 parts, algal mud: 2 - 4 parts; the algal species contained in the algal mud is Chlorella vulgaris.

[0009] According to the above scheme, the algal agent is gel microspheres with a particle size range of 0.3 - 0.42 cm.

[0010] According to the above scheme, the COD concentration in the complex high - salinity water is not less than 50 mg / L, the NH3 - N concentration is not less than 5 mg / L, and the metal ions co - existing with Pb 2+ include Cd 2+ , As 3+ , Cr 6+ , Cu 2+ , Mn 2+ , Zn 2+ , Al 3+ , Fe 3+ and so on, any one or several of them; among them, the concentrations of Cr 6+ , Mn 2+ and Zn 2+ are not less than 2 mg / L.

[0011] Further preferably, the COD concentration in the complex high - salinity water is 100 - 170 mg / L, the NH3 - N concentration is 5 - 10 mg / L, the Pb 2+ concentration is not less than 5 mg / L, and the other co - existing ions include Cd 2+ , As 3+ , Cr 6+ , Cu 2+ , Mn 2+ , Zn 2+ , Al 3+ , Fe 3+ and so on, any one or several of them, and the concentration of each metal ion does not exceed 60 mg / L. Preferably, the concentration of Cr 6+ is between 2 - 5 mg / L, the concentration of Mn 2+ is between 5 - 15 mg / L, and the concentration of Zn 2+ is between 15 - 25 mg / L.

[0012] According to the above scheme, the preparation method of the algal mud includes the following steps:

[0013] (1) In a sterile environment, inoculate the Chlorella vulgaris algal species into the culture medium, place the culture medium in a light incubator, and culture it to the stationary phase under the conditions of 20 - 30 °C, light intensity of 150 - 250 μmol photons·m -2 ·s -1 , and a light - dark cycle of (12 - 16) h / (8 - 12) h to obtain a microalgae suspension;

[0014] (2) Centrifuge the microalgae suspension to discard the upper layer of the culture medium, wash it, centrifuge it again to discard the supernatant, and obtain algal sludge.

[0015] According to the above scheme, the culture medium, based on the concentration of its nutrients, includes the following components: H3BO3 1.43 - 5.72 mg / L, MnCl4·4H2O 0.93 - 3.72 mg / L, ZnSO4·7H2O 0.11 - 0.44 mg / L, Na2MoO4·2H2O 0.0105 - 0.042 mg / L, CuSO4·5H2O 0.04 - 0.16 mg / L, CoNO3·6H2O 0.025 - 0.10 mg / L, MgSO4·7H2O 37.5 - 150 mg / L, CaCl2·2H2O 18 - 72 mg / L, citric acid 3 - 12 mg / L, ammonium ferric citrate 3 - 12 mg / L, EDTANa2 0.5 - 2 mg / L, Na2CO3 10 - 40 mg / L, NaNO3 750 - 3000 mg / L, K2HPO4 20 - 80 mg / L, and is prepared with pure water as the solvent.

[0016] According to the above scheme, the storage condition of the algal sludge is low-temperature storage at -5 to 0 °C.

[0017] According to the above scheme, the montmorillonite is sodium-based montmorillonite.

[0018] The preparation method of the above algal agent for removing lead from complex high-salt water includes the following steps:

[0019] (1) Add montmorillonite to water to make a uniform suspension, and then add algal sludge to obtain a microalgae-montmorillonite mixed suspension with a solid-liquid ratio of 0.0025 - 0.1 g / mL.

[0020] (2) Add sodium alginate to water to obtain a uniform viscous solution with a concentration of 0.0085 - 0.067 g / mL under heating conditions, and stir it evenly with the above microalgae-montmorillonite mixed suspension to obtain a gel homogeneous.

[0021] (3) Drop the above gel homogeneous into an aqueous CaCl2 solution, solidify, filter, and wash to obtain gel microspheres with a particle size range of 0.3 - 0.42 cm, which is the algal agent for removing lead from high-salt water.

[0022] The method for using the above algal agent to remove lead from complex high-salt water includes the following steps:

[0023] (1) Adjust the pH value of the lead-containing complex high-salt water to be treated to the range of 4.5 - 5.

[0024] (2) After adding the algal agent of the present invention, react with stirring at a temperature of 20 - 30 °C for 24 - 48 h to remove lead from the complex high-salt water.

[0025] According to the above scheme, the concentration of the algal agent added in step (2) is 5-15 g / L.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] (1) The algal agent for treating lead in complex high-salt water prepared by the present invention is an environment-friendly water purifying agent, which will not cause secondary pollution to the water body, has high efficiency, and the removal rate of lead in complex high-salt water reaches 99%.

[0028] (2) Montmorillonite in the present invention has excellent physicochemical characteristics such as ion adsorption, colloidal dispersion, and anisotropy, which can create a specific microenvironment for Chlorella vulgaris, provide nutrition and protection, and also has a strong adsorption effect on heavy metals. Sodium alginate can make the immobilized Chlorella vulgaris survive longer under the toxic effect of heavy metals and can also interact with metal ions. Chlorella vulgaris removes lead in wastewater through biosorption, bioaccumulation, and biomineralization.

[0029] (3) Chlorella vulgaris itself has a small morphology and poor sedimentation performance, and it is difficult to adapt to wastewater with complex components and high pollutant concentrations. It is difficult to achieve separation and reuse during the wastewater treatment process. The present invention introduces clay mineral montmorillonite to provide protection and support for it, and it can also be used as a heavy metal adsorbent. The algal immobilization technology is adopted to reduce the toxic effect of complex components in the wastewater on Chlorella vulgaris, improve the stability of Chlorella vulgaris, enable Chlorella vulgaris to fully play a bioremediation role to remove lead in the wastewater and facilitate recycling and reuse. Description of the Drawings

[0030] Figure 1 : Physical photograph of the algal agent obtained in Example 1.

[0031] Figure 2 : Experimental characterization data of treating simulated actual water body in Example 3. Detailed Embodiments

[0032] The following examples further illustrate the technical solutions of the present invention, but do not limit the protection scope of the present invention.

[0033] The Chlorella sorokiniana used in the detailed embodiments was isolated and purified from the Fankou lead-zinc tailings pond in Shaoguan City, Guangdong Province, China, and was obtained by culturing the separated algal species. The specific steps of algal species culture are as follows:

[0034] (1) Sterilization: The culture bottles, culture medium solutions and other vessel materials used for algal species culture were all treated by high-pressure steam sterilization (121 °C, 20 min) before use.

[0035] (2) Inoculation and cultivation: After inoculating the algal species into the culture medium in a sterile environment, place the culture flask in a light incubator and cultivate it to the stationary phase under the conditions of 25 °C, light intensity of 200 μmol photons·m -2 ·s -1 , and a light-dark cycle of 14 / 10 h.

[0036] (3) Preservation: Centrifuge the microalgae suspension at 5000 rpm, discard the upper layer of the culture medium, wash the precipitated part with ultrapure water, centrifuge again and discard the supernatant, repeat the washing three times, and store the obtained algal sludge at -4 °C.

[0037] The formulation of the BG-11 culture medium is as follows: H3BO3 2.86 mg, MnCl4·4H2O 1.86 mg, ZnSO4·7H2O 0.22 mg, Na2MoO4·2H2O 0.021 mg, CuSO4·5H2O 0.08 mg, CoNO3·6H2O 0.05 mg, MgSO4·7H2O 75 mg, CaCl2·2H2O 36 mg, citric acid 6 mg, ammonium ferric citrate 6 mg, EDTANa2 1 mg, Na2CO3 20 mg, NaNO3 1500 mg, K2HPO4 40 mg, and distilled water 1 L.

[0038] In the following examples, the montmorillonite is sodium-based montmorillonite, which is purchased through commercial channels.

[0039] Example 1

[0040] A preparation method of an algal agent for treating lead in complex high-salt water includes the following steps:

[0041] (1) Preparation of a microalgae-montmorillonite mixed suspension: Add 1 g of montmorillonite to 40 mL of ultrapure water to make a uniform suspension, then add 3 g of algal sludge, and stir at 25 °C and 200 rpm for 24 h to allow the microalgae to react fully with the montmorillonite to obtain a microalgae-montmorillonite mixed suspension;

[0042] (2) Preparation of a gel homogenate: Add 4 g of sodium alginate to 60 mL of ultrapure water, continuously stir with a glass rod under heating at 80 °C, and after obtaining a uniform viscous solution, let it stand for 12 h to defoam, and then stir it evenly with the mixed suspension obtained in step (1) to obtain a gel homogenate;

[0043] (3) Preparation of the algal agent for treating lead in complex high-salt water: Use a 5 mL syringe to slowly and evenly drop by drop the gel homogenate obtained in step (2) into a 4% CaCl2 solution to obtain gel beads. Let them stand for 3 h to solidify, then wash repeatedly with ultrapure water to remove the residual CaCl2 solution on the surface, place them on absorbent paper to blot dry the surface moisture, and obtain the Chlorella vulgaris - montmorillonite - sodium alginate gel beads, which are the algal agent for treating lead in complex high-salt water. The physical picture of the algal agent for treating lead in complex high-salt water obtained in this example is shown in the appendix Figure 1 as shown.

[0044] Example 2

[0045] A preparation method of an algal agent for treating lead in complex high-salt water includes the following steps:

[0046] (1) Preparation of the microalgae - montmorillonite mixed suspension: Add 1 g of montmorillonite to 40 mL of ultrapure water to make a uniform suspension, then add 3 g of algal sludge, and stir at 25°C and 200 rpm for 24 h to allow the microalgae to fully react with the montmorillonite, obtaining the microalgae - montmorillonite mixed suspension;

[0047] (2) Preparation of the gel homogenate: Add 3 g of sodium alginate to 60 mL of ultrapure water, continuously stir with a glass rod under heating at 80°C. After obtaining a uniform viscous solution, let it stand for 12 h to defoam, and then stir evenly with the mixed suspension obtained in step (1) to obtain the gel homogenate;

[0048] (3) Preparation of the algal agent for treating lead in complex high-salt water: Use a 5 mL syringe to slowly and evenly drop by drop the gel homogenate obtained in step (2) into a 2% CaCl2 solution to obtain gel beads. Let them stand for 3 h to solidify, then wash repeatedly with ultrapure water to remove the residual CaCl2 solution on the surface, place them on absorbent paper to blot dry the surface moisture, and obtain the Chlorella vulgaris - montmorillonite - sodium alginate gel beads, which are the algal agent for treating lead in complex high-salt water.

[0049] Example 3

[0050] A preparation method of an algal agent for treating lead in complex high-salt water includes the following steps:

[0051] (1) Preparation of the microalgae - montmorillonite mixed suspension: Add 1 g of montmorillonite to 40 mL of ultrapure water to make a uniform suspension, then add 3 g of algal sludge, and stir at 25°C and 200 rpm for 24 h to allow the microalgae to fully react with the montmorillonite, obtaining the microalgae - montmorillonite mixed suspension;

[0052] (2) Preparation of gel homogenate: Add 2 g of sodium alginate to 60 mL of ultrapure water, continuously stir with a glass rod under heating conditions at 80 °C. After obtaining a uniform viscous solution, let it stand for 12 h to remove bubbles, and then stir it evenly with the mixed suspension obtained in step (1) to obtain the gel homogenate;

[0053] (3) Preparation of algal agent for treating lead in complex high-salt water: Slowly and evenly dropwise add the gel homogenate obtained in step (2) into 4% CaCl2 solution using a 5 mL syringe to obtain gel beads, let them stand for 3 h to solidify, then repeatedly wash with ultrapure water to remove the residual CaCl2 solution on the surface, and place them on absorbent paper to dry the surface moisture to obtain Chlorella - montmorillonite - sodium alginate gel beads, which are the algal agent for treating lead in complex high-salt water.

[0054] Example 4

[0055] A preparation method of an algal agent for treating lead in complex high-salt water, comprising the following steps:

[0056] (1) Preparation of microalgae - montmorillonite mixed suspension: Add 0.1 g of montmorillonite to 40 mL of ultrapure water to make a uniform suspension, then add 3 g of algal mud, and stir at 25 °C and 200 rpm for 24 h to allow the microalgae and montmorillonite to fully react to obtain the microalgae - montmorillonite mixed suspension;

[0057] (2) Preparation of gel homogenate: Add 2 g of sodium alginate to 60 mL of ultrapure water, continuously stir with a glass rod under heating conditions at 80 °C. After obtaining a uniform viscous solution, let it stand for 12 h to remove bubbles, and then stir it evenly with the mixed suspension obtained in step (1) to obtain the gel homogenate;

[0058] (3) Preparation of algal agent for treating lead in complex high-salt water: Slowly and evenly dropwise add the gel homogenate obtained in step (2) into 4% CaCl2 solution using a 5 mL syringe to obtain gel beads, let them stand for 3 h to solidify, then repeatedly wash with ultrapure water to remove the residual CaCl2 solution on the surface, and place them on absorbent paper to dry the surface moisture to obtain Chlorella - montmorillonite - sodium alginate gel beads, which are the algal agent for treating lead in complex high-salt water.

[0059] Comparative Example 1

[0060] A preparation method of an algal agent for treating lead in complex high-salt water, comprising the following steps:

[0061] (1) Preparation of microalgae suspension: Add 3 g of algal mud to 40 mL of ultrapure water to make a uniform suspension;

[0062] (2) Preparation of gel homogenate: Add 3 g of sodium alginate to 60 mL of ultrapure water, continuously stir with a glass rod under heating conditions at 80 °C. After obtaining a uniform viscous solution, let it stand for 12 h to remove bubbles, and then stir it evenly with the suspension obtained in step (1) to obtain the gel homogenate;

[0063] (3) Preparation of algal agent for treating lead in complex high-salt water: Slowly and evenly drop the gel homogenate obtained in step (2) into 2% CaCl2 solution using a 5 mL syringe to obtain gel beads. Let them stand for 3 h to solidify, then repeatedly wash with ultrapure water to remove the residual CaCl2 solution on the surface, and place them on absorbent paper to dry the surface moisture, thus obtaining the algal agent for treating lead in complex high-salt water.

[0064] Comparative Example 2

[0065] A preparation method of a lead removal agent, comprising the following steps:

[0066] (1) Preparation of montmorillonite suspension: Add 1 g of montmorillonite to 40 mL of ultrapure water to make a uniform suspension;

[0067] (2) Preparation of gel homogenate: Add 3 g of sodium alginate to 60 mL of ultrapure water, continuously stir with a glass rod under heating conditions at 80 °C. After obtaining a uniform viscous solution, let it stand for 12 h to remove bubbles, and then stir it evenly with the suspension obtained in step (1) to obtain the gel homogenate;

[0068] (3) Preparation of a lead removal agent: Slowly and evenly drop the gel homogenate obtained in step (2) into 2% CaCl2 solution using a 5 mL syringe to obtain gel beads. Let them stand for 3 h to solidify, then repeatedly wash with ultrapure water to remove the residual CaCl2 solution on the surface, and place them on absorbent paper to dry the surface moisture, thus obtaining the lead removal agent.

[0069] The products obtained in the examples and comparative examples were respectively subjected to mechanical property tests and lead removal tests. The particle size was measured using a ruler; for the determination of compressive strength, place the gel beads on the tray of an electronic balance and zero it, slowly press the gel beads with a flat plate, and use the reading of the electronic balance when the gel beads undergo irreversible deformation (less than 1 / 3 of its diameter and irreversible) as the index of compressive strength; for the lead removal experiment, fix the dosage of the algal agent at 10 g / L, in a 100 ppm lead solution at pH = 5, place it at 25 °C and 200 rpm to study the Pb removal effect, and the results are shown in Table 1.

[0070] Particle size (cm) Compressive strength (g) <![CDATA[Pb 2+ Removal rate]]> Example 1 0.37 546 95.3％ Example 2 0.36 544 97.8％ Example 3 0.36 544 99.4％ Example 4 0.33 482 96.9％ Comparative Example 1 0.30 416 86.3％ Comparative Example 2 0.36 543 67.2％

[0071] As can be seen from Table 1, the algal agents obtained in Examples 1-4 have a high removal rate of lead in water, reaching over 90%; the removal rate of Comparative Example 1 is 86.3%; and the removal rate of Comparative Example 2 is 67.2%. From the data of compressive strength, it can be seen that the addition of montmorillonite provides a protective support for Chlorella and enhances the mechanical properties of the gel beads.

[0072] The algal agent obtained in Example 3 was subjected to an experiment simulating actual water bodies:

[0073] Simulate the composition of actual industrial wastewater in an industrial park in Baotou City, Inner Mongolia Autonomous Region. The initial COD concentration in the simulated wastewater is 163.5 mg / L, the initial NH3-N concentration is 6.8 mg / L, the initial P concentration is 2.54 mg / L, and the Pb 2+ content is 7.5835 mg / L. Other coexisting ions include Cd 2+ , As 3+ , Cr 6+ , Cu 2+ , Mn 2+ , Zn 2+ , Al 3+ and Fe 3+ , among which the concentrations of Cr 6+ , Mn 2+ and Zn 2+ are relatively high, being 2.5833, 10.1403, and 22.067 mg / L respectively.

[0074] Lead removal experiment: The product obtained in Example 3 was put into the simulated actual wastewater for reaction. The dosage was 15 g / L, and the reaction was carried out at 25 °C and 150 rpm for 10 h. Chemical methods were used to test the COD, NH3-N, and P contents in the simulated lead-containing wastewater before and after treatment, and the heavy metal contents in the simulated wastewater before and after treatment were tested by inductively coupled plasma (ICP). The test results showed that the removal of lead in the wastewater could reach 99%, and at the same time, some coexisting ions could also be removed. The removal rates of each ion were 47.66% (Cd 2+ ), 88.16% (As 3+ ), 17.76% (Cr 6+ ), 85.47% (Cu 2+ ), 0.53% (Mn 2+ ), 24.32% (Zn 2+ ), 4.96% (Al 3+ ) and 99.06% (Fe 3+ ), as specifically shown in Figure 2 .

[0075] From the treatment effect of lead in complex high-salt water, it can be concluded that: under relatively complex conditions, the gel beads of the present invention still have good lead removal performance, and a lead removal rate of >99% can be achieved. While efficiently removing lead, it also has varying degrees of removal of co-existing ions such as COD, P, NH3-N, and Cd 2+ , As 3+ , Cr 6+ in the water body, and has practical application prospects.

[0076] Finally, it should be noted that: the above-described embodiments are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. An algae agent for removing lead from complex high-salt water, characterized in that The raw materials include by weight: 0.1-2 parts of montmorillonite, 2-4 parts of sodium alginate, 1-5 parts of calcium chloride, and 2-4 parts of algae mud; the algae species contained in the algae mud is Chlorella vulgaris.

2. The algae agent for removing lead from complex high-salt water as claimed in claim 1, characterized in that The algae agent is a gel microsphere with a particle size ranging from 0.3 to 0.42 cm.

3. The algae agent for removing lead from complex high-salt water as claimed in claim 1, characterized in that The COD concentration in the complex high-salt water is not less than 50 mg / L, the NH3-N concentration is not less than 5 mg / L, and the Pb 2+ Coexisting metal ions include but are not limited to Cd 2+ 、As 3+ Cr 6+ , Cu 2+ , Mn 2+ 、Zn 2+ 、Al 3+ , Fe 3+ Any one or more of the following, among which Cr 6+ , Mn 2+ and Zn 2+ The concentration was no less than 2 mg / L.

4. The algae agent for removing lead from complex high-salt water as claimed in claim 1, characterized in that The complex high-salt water has a COD concentration of 100-170 mg / L, an NH3-N concentration of 5-10 mg / L, and a Pb 2+ The concentration is not less than 5 mg / L, and other coexisting ions include Cd 2+ 、As 3+ Cr 6+ , Cu 2+ , Mn 2+ 、Zn 2+ 、Al 3+ , Fe 3+ For any one or more of the above, the concentration of each metal ion does not exceed 60 mg / L.

5. The algae agent for removing lead from complex high-salt water as claimed in claim 1, characterized in that The method for preparing algae mud comprises the following steps: (1) In a sterile environment, the Chlorella species was inoculated into the culture medium, and the culture medium was placed in a light incubator at 20-30°C and a light intensity of 150-250 μmol photons·m -2 ·s -1 , culturing to a stable period under the conditions of a light-dark cycle of (12-16) h / (8-12) h to obtain a microalgae suspension; (2) The microalgae suspension is centrifuged to discard the upper culture medium, washed and centrifuged again to discard the supernatant to obtain algae mud.

6. The algae agent for removing lead from complex high-salt water as claimed in claim 5, characterized in that The culture medium comprises the following components in terms of nutrient concentration: H3BO3 1.43-5.72 mg / L, MnCl4·4H2O 0.93-3.72 mg / L, ZnSO4·7H2O 0.11-0.44 mg / L, Na2MoO4·2H2O 0.0105-0.042 mg / L, CuSO4·5H2O 0.04-0.16 mg / L, CoNO3·6H2O 0.025-0.10 mg / L, MgSO4·7H2O 37.5-150 mg / L, CaCl2·2H2O 18-72 mg / L, citric acid 3-12 mg / L, ammonium ferric citrate 3-12 mg / L, EDTANa2 0.5-2 mg / L, Na2CO3 10~40mg / L, NaNO3750~3000mg / L, K2HPO4 20~80mg / L, prepared with pure water as solvent.

7. The algae agent for removing lead from complex high-salt water as claimed in claim 1, characterized in that The algae mud is stored in a low temperature environment of -5 to 0°C; the montmorillonite is sodium montmorillonite.

8. The method for preparing the algae agent for removing lead from complex high-salt water according to any one of claims 1 to 7, characterized in that The following steps are involved: (1) adding montmorillonite to water to form a uniform suspension, and then adding algae mud to obtain a microalgae montmorillonite mixed suspension with a solid-liquid ratio of 0.0025-0.1 g / mL; (2) adding sodium alginate to water to obtain a uniform viscous solution with a concentration of 0.0085-0.067 g / mL under heating conditions, and stirring the solution with the above-mentioned microalgae montmorillonite mixed suspension to obtain a homogeneous gel; (3) The gel is homogenously dropped into a CaCl2 aqueous solution, solidified, filtered, and washed to obtain gel microspheres with a particle size range of 0.3-0.42 cm, which are the algae agent for removing lead from high salt water.

9. The method for removing lead from complex high-salt water using the algae agent according to any one of claims 1 to 7, characterized in that The following steps are involved: (1) adjusting the pH value of the lead-containing complex high-salt water to be treated to a range of 4.5-5; (2) After adding the algae agent according to any one of claims 1 to 5, the reaction is stirred at a temperature of 20-30° C. for 24-48 hours, thereby achieving lead removal in complex high-salt water.

10. The method according to claim 9, characterized in that The concentration of the algae agent added in step (2) is 5-15 g / L.

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