Composite oxidizing agent water purifier

Abstract

The application discloses a composite oxidizing agent water purifying agent and a preparation method thereof, and relates to the technical field of water treatment. The preparation method is as follows: 2-8 parts of potassium permanganate, 2-8 parts of sodium percarbonate, 5-15 parts of sodium hypochlorite, 2-8 parts of sodium persulfate, 2-8 parts of potassium hydrogen persulfate, 0.2-2 parts of titanium dioxide, 1-3 parts of sulfoblocked scale inhibition copolymer, 0.5-1.5 parts of black cumin seed regeneration powder, 5-20 parts of polyaluminum chloride, 5-15 parts of ferrous salt, 0.1-0.5 parts of calcium chloride and 0.1-0.5 parts of sodium bicarbonate are weighed according to the proportion and uniformly mixed to obtain the composite oxidizing agent water purifying agent. The composite oxidizing agent water purifying agent can solve the water quality problems such as the excessive permanganate index, the excessive heavy metal (manganese), the excessive microorganism, the excessive colority, the excessive turbidity and the like in the technical field of water treatment by the combination of various oxidizing agents, the addition of the prepared sulfoblocked scale inhibition copolymer and the black cumin seed regeneration powder.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of water treatment agents, in particular to a composite oxidizing agent water purifying agent. BACKGROUND

[0002] At present, the oxidizing agents used in waterworks or sewage treatment plants are relatively single, and even if the oxidizing agents are used in combination, multiple sets of equipment are needed for dosing, the cost is large, multiple agents need to be dosed and dosing methods need to be controlled respectively, which is difficult in technology and requires high professional degree of water plant personnel, and the use of agents is unreasonable in small and medium-sized water treatment enterprises due to lack of technical personnel. At the same time, single oxidizing agent has many technical defects in use. For example, sodium hypochlorite has no degradation capacity for anti-chlorine organic matter, can oxidize fewer pollutants, and has the risk of exceeding the standard of by-products; potassium permanganate cannot decompose organic matter containing saturated bonds, has the risk of color in use, and needs a long reaction time; potassium hydrogen persulfate needs to add an activator, otherwise the oxidation effect is poor.

[0003] Water quality problems have been one of the hot issues of social concern. Problems such as excessive permanganate index, excessive heavy metals, excessive microorganisms, excessive color, and excessive turbidity are widespread in various water bodies, which seriously affect the utilization of water resources and human life. It is of great practical significance and broad application prospect to develop new type of efficient, low cost and easy-to-operate water treatment agent. SUMMARY

[0004] The purpose of the present application is to provide a composite oxidizing agent water purifying agent to solve the problems in the background art.

[0005] To achieve the above purpose, the present application provides the following technical scheme:

[0006] A composite oxidizing agent water purifying agent comprises the following raw materials by weight:

[0007] Potassium permanganate 2-8 parts;

[0008] Sodium percarbonate 2-8 parts;

[0009] Sodium hypochlorite 5-15 parts;

[0010] Sodium persulfate 2-8 parts;

[0011] Potassium hydrogen persulfate 2-8 parts;

[0012] Titanium dioxide 0.2-2 parts;

[0013] Sulfonated end-capped scale inhibition copolymer 1-3 parts;

[0014] Black cumin seed regenerative powder 0.5-1.5 parts;

[0015] Polyaluminum chloride 5-20 parts;

[0016] Ferrous salt 5-15 parts;

[0017] Calcium chloride 0.1-0.5 parts;

[0018] Sodium bicarbonate 0.1-0.5 parts;

[0019] The preparation steps of the sulfobutyl-terminated scale inhibition copolymer are as follows:

[0020] A1, 2-acrylamide-2-methylpropane sulfonic acid and sodium hypophosphite are placed in a three-necked flask, the three-necked flask is placed in an oil bath, and the temperature is gradually increased to 80℃ within 1h, acrylic acid, ammonium persulfate and water are mixed to obtain a mixed solution, the acrylic acid and ammonium persulfate solution is gradually introduced into the three-necked flask during the heating process, and the reaction is continued at 80℃ for 0.5h to obtain an intermediate product;

[0021] A2, the intermediate product is dissolved in ultrapure water, sublimed sulfur and sodium hydroxide are added, and the temperature is increased to 95℃ under oxygen atmosphere for 36h, and centrifuged at a speed of 6000-7000r / min for 15min to obtain a supernatant, the supernatant is dialyzed with ultrapure water, dried in a freeze dryer for 24h, and ground to obtain a sulfobutyl-terminated scale inhibition copolymer.

[0022] Further, in A1, the amount ratio of 2-acrylamide-2-methylpropane sulfonic acid, sodium hypophosphite, acrylic acid, ammonium persulfate and water is 2g:(0.65-0.8)g:3.3g:(0.35-0.4)g:5mL; in A2, the amount ratio of the intermediate product, ultrapure water, sublimed sulfur and sodium hydroxide is 3g:200mL:4.8g:10g.

[0023] Further, the molecular weight of the sulfobutyl-terminated scale inhibition copolymer is 1000-3000.

[0024] Further, the black cumin seed regenerated powder is obtained by a post-treatment step after the black cumin seed residue obtained after refining black cumin seed oil, the post-treatment step is as follows:

[0025] The residue is washed with distilled water for 3 times, dried in a 80℃ drying oven for 24h, crushed by a grinding machine, sieved by a sieve with a pore size of 0.5mm to obtain a uniform powder residue, the uniform powder residue is poured into a 0.3mol / L sodium hydroxide solution, 100mL of the sodium hydroxide solution is used for every 1g of the uniform powder residue, slowly stirred at room temperature for 24h, and dried in a 80℃ drying oven for 24h to obtain a black cumin seed regenerated powder.

[0026] Further, the polyaluminum chloride contains not less than 30% of aluminum oxide, has a basicity of 40%-90%, and contains not more than 0.5% of water-insoluble substances.

[0027] Further, the use method of the composite oxidizing agent water purifying agent is as follows: the composite oxidizing agent water purifying agent is added into raw water or sewage at 1%-2% of the weight of the raw water or sewage.

[0028] A preparation method of a composite oxidizing agent water purifying agent is as follows: potassium permanganate, sodium percarbonate, sodium hypochlorite, sodium persulfate, potassium hydrogen persulfate, titanium dioxide, sulfobutyl-terminated scale-inhibiting copolymer, black cumin seed regenerative powder, polyaluminum chloride, ferrous salt, calcium chloride and sodium bicarbonate are weighed according to the proportion and uniformly mixed to obtain the composite oxidizing agent water purifying agent.

[0029] Compared with the prior art, the present application has the following beneficial effects:

[0030] 1. Multiple oxidizing agents are used to achieve complementary advantages. The reagents such as sodium hypochlorite and potassium hydrogen persulfate provide an acidic environment, which can enhance the oxidizing ability of potassium permanganate and is conducive to the generation of sulfate radicals; manganese dioxide generated after the hydrolysis of potassium permanganate can activate potassium hydrogen persulfate to generate stronger sulfate radicals and stronger oxidizing ability; sodium percarbonate releases hydrogen peroxide to assist potassium permanganate in oxidizing organic matter; sodium hypochlorite, potassium hydrogen persulfate and sodium percarbonate can remove sulfides, organic sulfides and other substances that interfere with the reaction of potassium permanganate, thereby improving the utilization rate of potassium permanganate and making the removal effect of potassium permanganate on other pollutants more stable; both sodium persulfate and potassium hydrogen persulfate can generate sulfate radicals to synergistically degrade organic pollutants; sodium hypochlorite and potassium permanganate synergistically kill bacteria to improve the disinfection effect; titanium dioxide can generate free radicals under ultraviolet irradiation, which synergistically act with oxidizing agents to improve the oxidation efficiency, assist in the oxidative degradation of organic matter and kill microorganisms. By using multiple oxidizing agents, the proportion of potassium permanganate and the total amount of the reagents can be reduced to reduce the risk of colority; each oxidizing agent has pollutants such as organic matter or algae that cannot be removed, and by using multiple oxidizing agents, the range of pollutants that can be removed by the reagents is expanded, and the removal rate of multiple pollutants is improved.

[0031] 2. The sulfonic group-terminated scale-inhibiting copolymer has the dual effects of scale inhibition and antibiosis. On the one hand, the hydrophilic sulfonic acid groups and carboxylic acid groups in the sulfonic group-terminated scale-inhibiting copolymer have good scale inhibition and dispersion performance and exhibit better chelating ability to calcium ions and magnesium ions. In the crystallization process of scale-forming compounds such as calcium carbonate, magnesium hydroxide, magnesium carbonate and calcium sulfate, the scale inhibitor is physically adsorbed on the surface of the microcrystal, occupies the active sites on the surface of the crystal growth structure, deforms the crystal lattice of the scale-forming compound and causes defects on the outside of the crystal. Therefore, the scale becomes soft, thereby inhibiting the ability of the scale-forming compound to nucleate and grow. In addition, the sulfur quantum dots on the surface of the sulfonic group-terminated scale-inhibiting copolymer continuously collide with the anions that form scale, hindering their further combination with calcium ions and magnesium ions and reducing the possibility of precipitation of mineral scale. The weak interaction between the sulfonic acid and carboxylic acid groups on the molecular structure and calcium ions and magnesium ions enables continuous capture and release of calcium ions and magnesium ions, which indirectly enhances the tolerance of calcium ions and magnesium ions in water, thereby playing a dynamic inhibition role. On the other hand, the sulfonic group-terminated scale-inhibiting copolymer can effectively inhibit the growth of Bacillus subtilis and some algae. The sulfur core in the structure of the sulfonic group-terminated scale-inhibiting copolymer mainly contributes to its antibacterial activity, and the combination of the intermediate product with the surface of the sulfur quantum dots helps to interact with the bacterial cell wall, thereby enhancing the antibacterial effect. The antibacterial activity of the sulfonic group-terminated scale-inhibiting copolymer is mainly attributed to its ability to destroy the microbial cell membrane: increased membrane permeability leading to cell lysis. The sulfonic group-terminated scale-inhibiting copolymer can also induce the production of reactive oxygen species, including superoxide anions and hydroxyl radicals, under light, which can cause oxidative stress in microbial cells, damaging important components such as DNA, proteins and lipids. In addition, the sulfur quantum dots can inhibit basic enzyme activity, interfere with enzyme-substrate interactions and thus disrupt metabolic processes essential for microbial survival.

[0032] 3. The black cumin seed regenerated powder has strong heavy metal adsorption capacity. The prepared black cumin seed regenerated powder has a heterogeneous surface morphology, including many protrusions and cavities, and abundant functional groups, which increase the micro surface area of the black cumin seed regenerated powder particles, provide a large number of surface active binding sites, are conducive to the biosorption of heavy metals, and can be used as a new type of biosorption material for removing heavy metal pollution in water environment, especially manganese exceeding the standard. The biosorption of heavy metals by the black cumin seed regenerated powder is a spontaneous physical process and has excellent heavy metal treatment performance.

[0033] 4. Other auxiliary agents. The polyaluminum chloride and ferrous salt synergistically improve the flocculation effect and remove turbidity; calcium chloride assists flocculation, improves the flocculation effect and adjusts water hardness. Sodium bicarbonate can adjust the pH value of water, which is good for flocculation and precipitation.

[0034] 5. In summary, this invention can solve water quality problems in the field of water treatment technology, such as excessive permanganate index, excessive heavy metal (manganese), excessive microorganisms, excessive color, and excessive turbidity. This invention can be added using only one set of equipment, making operation simpler, saving water plant fixed asset expenditures and energy consumption costs, and reducing labor costs. Detailed Implementation

[0035] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] (1) The preparation steps of the sulfonyl-terminated scale inhibitor copolymer are as follows:

[0037] A1. Place 2g of 2-acrylamide-2-methylpropanesulfonic acid and 0.8g of sodium hypophosphite in a three-necked flask. Place the three-necked flask in an oil bath and gradually raise the temperature to 80°C over 1 hour. Mix 3.3g of acrylic acid, 0.4g of ammonium persulfate, and 5mL of water to obtain a mixed solution. Gradually introduce the acrylic acid and ammonium persulfate solution into the three-necked flask during the heating process. Continue the reaction at 80°C for 0.5 hours to obtain the intermediate product.

[0038] A2. Dissolve 3g of intermediate product in 200mL of ultrapure water, add 4.8g of sublimed sulfur and 10g of sodium hydroxide, heat to 95℃ and react for 36h under an oxygen atmosphere, centrifuge at 6500r / min for 15min to obtain supernatant, dialyze the supernatant with ultrapure water, dry in a freeze dryer for 24h, grind to obtain sulfonyl end-capped scale inhibitor copolymer with a molecular weight of 2850.

[0039] (2) Black cumin seed regenerated powder is obtained from the waste residue after black cumin seed oil extraction through a post-processing step, which is as follows:

[0040] The residue was washed three times with distilled water and dried in an 80℃ drying oven for 24 hours. It was then pulverized using a grinder and sieved through a 0.5mm sieve to obtain a uniform powder residue. The uniform powder residue was poured into a 0.3mol / L sodium hydroxide solution, with 100mL of sodium hydroxide solution used for every 1g of uniform powder residue. After stirring slowly at room temperature for 24 hours, it was dried in an 80℃ drying oven for 24 hours to obtain regenerated black cumin seed powder.

[0041] (3) The polyaluminum chloride contains not less than 30% aluminum oxide, has a basicity of 40%-90%, and has a water-insoluble content of not more than 0.5%.

[0042] Example 1:

[0043] A composite oxidizing agent water purifying agent, comprising the following raw materials by weight:

[0044] Potassium permanganate 5 parts;

[0045] Sodium percarbonate 5 parts;

[0046] Sodium hypochlorite 10 parts;

[0047] Sodium persulfate 5 parts;

[0048] Potassium hydrogen persulfate 5 parts;

[0049] Titanium dioxide 1.1 parts;

[0050] Sulfonated end-capped scale-inhibiting copolymer 2 parts;

[0051] Black cumin seed regenerative powder 1 part;

[0052] Polyaluminum chloride 12.5 parts,

[0053] Ferrous salt 10 parts;

[0054] Calcium chloride 0.3 parts;

[0055] Sodium bicarbonate 0.3 parts;

[0056] A preparation method of a composite oxidizing agent water purifying agent is as follows:

[0057] Potassium permanganate, sodium percarbonate, sodium hypochlorite, sodium persulfate, potassium hydrogen persulfate, titanium dioxide, sulfonated end-capped scale-inhibiting copolymer, black cumin seed regenerative powder, polyaluminum chloride, ferrous salt, calcium chloride and sodium bicarbonate are weighed according to the proportion and uniformly mixed to obtain the composite oxidizing agent water purifying agent.

[0058] Example 2:

[0059] A composite oxidizing agent water purifying agent, comprising the following raw materials by weight:

[0060] Potassium permanganate 8 parts;

[0061] Sodium percarbonate 8 parts;

[0062] Sodium hypochlorite 15 parts;

[0063] Sodium persulfate 8 parts;

[0064] Potassium hydrogen persulfate 8 parts;

[0065] Titanium dioxide 2 parts;

[0066] Sulfonated end-capped scale-inhibiting copolymer 3 parts;

[0067] Black cumin seed regenerative powder 1.5 parts;

[0068] Polyaluminum chloride 20 parts,

[0069] Ferrous salt 15 parts;

[0070] Calcium chloride 0.5 parts;

[0071] Sodium bicarbonate 0.5 parts;

[0072] A preparation method of a composite oxidizing agent water purifying agent is as follows:

[0073] Potassium permanganate, sodium percarbonate, sodium hypochlorite, sodium persulfate, potassium hydrogen persulfate, titanium dioxide, sulfoblocked scale inhibition copolymer, black cumin seed regeneration powder, polyaluminum chloride, ferrous salt, calcium chloride and sodium bicarbonate are weighed according to the proportion and uniformly mixed to obtain a composite oxidizing agent water purifying agent.

[0074] Example 3:

[0075] A composite oxidizing agent water purifying agent comprises the following parts by weight of raw materials:

[0076] Potassium permanganate 2 parts;

[0077] Sodium percarbonate 2 parts;

[0078] Sodium hypochlorite 5 parts;

[0079] Sodium persulfate 2 parts;

[0080] Potassium hydrogen persulfate 2 parts;

[0081] Titanium dioxide 0.2 parts;

[0082] Sulfoblocked scale inhibition copolymer 1 part;

[0083] Black cumin seed regeneration powder 0.5 parts;

[0084] Polyaluminum chloride 5 parts,

[0085] Ferrous salt 5 parts;

[0086] Calcium chloride 0.1 parts;

[0087] Sodium bicarbonate 0.1 parts;

[0088] A preparation method of a composite oxidizing agent water purifying agent is as follows:

[0089] Potassium permanganate, sodium percarbonate, sodium hypochlorite, sodium persulfate, potassium hydrogen persulfate, titanium dioxide, sulfoblocked scale inhibition copolymer, black cumin seed regeneration powder, polyaluminum chloride, ferrous salt, calcium chloride and sodium bicarbonate are weighed according to the proportion and uniformly mixed to obtain a composite oxidizing agent water purifying agent.

[0090] Comparative Example 1:

[0091] A composite oxidizing agent water purifying agent comprises the following raw materials by weight:

[0092] Potassium permanganate 21.1 parts;

[0093] Sodium hypochlorite 10 parts;

[0094] Sulfonated scale-inhibiting copolymer 2 parts;

[0095] Black cumin seed regenerative powder 1 part;

[0096] Polyaluminum chloride 12.5 parts,

[0097] Ferrous salt 10 parts;

[0098] Calcium chloride 0.3 parts;

[0099] Sodium bicarbonate 0.3 parts;

[0100] A preparation method of the composite oxidizing agent water purifying agent is as follows:

[0101] Potassium permanganate, sodium hypochlorite, sulfonated scale-inhibiting copolymer, black cumin seed regenerative powder, polyaluminum chloride, ferrous salt, calcium chloride and sodium bicarbonate are weighed according to the proportion and uniformly mixed to obtain the composite oxidizing agent water purifying agent.

[0102] The difference between the present comparative example and example 1 is that sodium percarbonate, sodium persulfate, potassium hydrogen persulfate and titanium dioxide are not added, and the weight fraction of potassium permanganate is changed to 21.1 parts.

[0103] Comparative example 2:

[0104] A composite oxidizing agent water purifying agent comprises the following raw materials by weight:

[0105] Potassium permanganate 5 parts;

[0106] Sodium percarbonate 5 parts;

[0107] Sodium hypochlorite 10 parts;

[0108] Sodium persulfate 5 parts;

[0109] Potassium hydrogen persulfate 5 parts;

[0110] Titanium dioxide 1.1 parts;

[0111] Black cumin seed regenerative powder 1 part;

[0112] Polyaluminum chloride 12.5 parts,

[0113] Ferrous salt 10 parts;

[0114] Calcium chloride 0.3 parts;

[0115] Sodium bicarbonate 0.3 parts;

[0116] A preparation method of the composite oxidizing agent water purifying agent is as follows:

[0117] Potassium permanganate, sodium percarbonate, sodium hypochlorite, sodium persulfate, potassium hydrogen persulfate, titanium dioxide, black cumin seed regeneration powder, polyaluminum chloride, ferrous salt, calcium chloride, and sodium bicarbonate are weighed according to the proportion and uniformly mixed to obtain the composite oxidizing agent water purifying agent.

[0118] The difference between the present comparative example and Example 1 is that the sulfoblocked scale-inhibiting copolymer is not added.

[0119] Comparative Example 3:

[0120] A composite oxidizing agent water purifying agent comprises the following raw materials by weight:

[0121] Potassium permanganate 5 parts;

[0122] Sodium percarbonate 5 parts;

[0123] Sodium hypochlorite 10 parts;

[0124] Sodium persulfate 5 parts;

[0125] Potassium hydrogen persulfate 5 parts;

[0126] Titanium dioxide 1.1 parts;

[0127] Sulfoblocked scale-inhibiting copolymer 2 parts;

[0128] Polyaluminum chloride 12.5 parts,

[0129] Ferrous salt 10 parts;

[0130] Calcium chloride 0.3 parts;

[0131] Sodium bicarbonate 0.3 parts;

[0132] A preparation method of the composite oxidizing agent water purifying agent is as follows:

[0133] Potassium permanganate, sodium percarbonate, sodium hypochlorite, sodium persulfate, potassium hydrogen persulfate, titanium dioxide, sulfoblocked scale-inhibiting copolymer, polyaluminum chloride, ferrous salt, calcium chloride, and sodium bicarbonate are weighed according to the proportion and uniformly mixed to obtain the composite oxidizing agent water purifying agent.

[0134] The difference between the present comparative example and Example 1 is that the black cumin seed regeneration powder is not added.

[0135] Water treatment test:

[0136] The composite oxidizing agent water purifying agents prepared in Examples 1-3 and Comparative Examples 1-3 are added to raw water at 1% by weight of the raw water. The raw water is derived from mixed sewage of industrial wastewater and domestic sewage in an industrial park in Gaoxin District, Mianyang City. The test results are shown in Table 1.

[0137] Table 1

[0138] raw water Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 CODMn(mg / L) 7.45 1.16 0.99 1.03 4.61 1.89 1.76 Mn(mg / L) 12.73 0.01 0.01 0.01 0.01 10.53 0.01 Bacillus subtilis(CFU / L) 152 ND ND ND ND ND 105 colority(degree) 26 8 7 8 10 11 11 turbidity(NTU) 2.60 0.35 0.46 0.43 0.85 0.76 0.79 whether it meets "GB5749-2022" no yes yes yes no no no

[0139] In the description, reference to terms such as "one embodiment", "an example", "certain examples" or the like means that a particular feature, structure, material or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. The appearances of the phrases "in one embodiment" or "an example", "in certain examples" in various places in the specification are not necessarily referring to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0140] The above merely provides example and illustration of the present application, and those skilled in the art can make various modifications or supplement to the described specific embodiments or adopt similar ways to replace, as long as it does not deviate from the invention or beyond the scope defined by the claims, which shall fall within the protection scope of the present application.

Claims

1. A composite oxidizing agent for water purification, characterized in that, The following raw materials are included by weight parts: Potassium permanganate 2-8 parts; Sodium percarbonate 2-8 parts; Sodium hypochlorite 5-15 parts; Sodium persulfate 2-8 parts; Potassium hydrogen persulfate 2-8 parts; Titanium dioxide 0.2-2 parts; Sulfonated end-capped scale inhibition copolymer 1-3 parts; Black cumin seed regenerated powder 0.5-1.5 parts; Polyaluminum chloride 5-20 parts; Ferrous salt 5-15 parts; Calcium chloride 0.1-0.5 parts; Sodium bicarbonate 0.1-0.5 parts; The sulfonated end-capped scale inhibition copolymer is prepared by the following steps: A1, 2-acrylamide-2-methylpropane sulfonic acid and sodium hypophosphite are placed in a three-necked flask, the three-necked flask is placed in an oil bath, and the temperature is gradually increased to 80℃ within 1h, acrylic acid, ammonium persulfate and water are mixed to obtain a mixed solution, the acrylic acid and ammonium persulfate solution is gradually introduced into the three-necked flask during the heating process, and the reaction is continued at 80℃ for 0.5h to obtain an intermediate product; A2, the intermediate product is dissolved in ultrapure water, sulfur and sodium hydroxide are added, and the temperature is increased to 95℃ under oxygen atmosphere for 36h, centrifuged at a speed of 6000-7000r / min for 15min to obtain a supernatant, the supernatant is dialyzed with ultrapure water, dried in a freeze dryer for 24h, ground, and the sulfonated end-capped scale inhibition copolymer is obtained; The black cumin seed regenerated powder is obtained by post-processing steps after the black cumin seed residue obtained after refining black cumin seed oil, and the post-processing steps are as follows: The residue is washed with distilled water for 3 times, dried in a 80℃ drying oven for 24h, crushed with a grinding machine, screened with a 0.5mm mesh screen to obtain uniform powder residue, the uniform powder residue is poured into a 0.3mol / L sodium hydroxide solution, 100mL of sodium hydroxide solution is used for every 1g of uniform powder residue, slowly stirred at room temperature for 24h, and dried in a 80℃ drying oven for 24h to obtain the black cumin seed regenerated powder.

2. The composite oxidizing water purifying agent according to claim 1, characterized by: In A1, the amount ratio of 2-acrylamide-2-methylpropane sulfonic acid, sodium hypophosphite, acrylic acid, ammonium persulfate and water is 2g:(0.65-0.8)g:3.3g:(0.35-0.4)g:5mL; in A2, the amount ratio of the intermediate product, ultrapure water, sulfur and sodium hydroxide is 3g:200mL:4.8g:10g.

3. The composite oxidizing water purifying agent according to claim 1, characterized by: The molecular weight of the sulfonated end-capped scale inhibition copolymer is 1000-3000.

4. The composite oxidizing water purifying agent according to claim 1, characterized by: The polyaluminum chloride contains not less than 30% of aluminum oxide, has a basicity of 40%-90%, and contains not more than 0.5% of water-insoluble substances.