A mold inhibitor based on desulfurization wastewater modification and a preparation method and application thereof

Abstract

The present application relates to mould inhibition technology and desulfurization wastewater treatment field, especially to a kind of mould inhibitor and its preparation method and application, including desulfurization wastewater 90-110 parts, chitosan 8-12 parts, sodium lignosulfonate 5-8 parts, quaternary ammonium salt disinfectant 5-10 parts and anionic flocculant 0.001-0.002 parts.Desulfurization wastewater contains higher content of chloride ion, and various heavy metal ions, including but not limited to mercury, copper, iron, zinc and lead, so high cost is needed to treat desulfurization wastewater every year, the present application uses desulfurization wastewater as the main component of mould inhibitor, and is supplemented with chitosan, sodium lignosulfonate, quaternary ammonium salt disinfectant and anionic flocculant, the prepared mould inhibitor not only has long-term efficient removal and inhibition effect of mould, but also reduces the treatment cost of desulfurization wastewater and the production cost of mould inhibitor.The mould inhibitor of the present application has long-term efficient removal and inhibition effect on common moulds such as aspergillus niger, trichoderma longibrachiatum and paecilomyces variotii.

Description

Technical Field

[0001] This invention relates to the fields of mold inhibition technology and desulfurization wastewater treatment, and in particular to a mold inhibitor based on desulfurization wastewater modification, its preparation method, and its application. Background Technology

[0002] From May to July each year, the Yangtze River and Huai River basins are in summer, with high temperatures and humidity, providing an ideal environment for mold growth. In addition, the Yangtze River and Huai River basins often experience continuous rainy weather during this period, the so-called "plum rain season" or "mold rain season". The long-term rainy weather leads to persistently high air humidity, which further promotes the growth and spread of mold.

[0003] Therefore, it is particularly urgent and important to develop a low-cost, long-lasting, and highly effective mold inhibitor.

[0004] At the same time, the treatment of desulfurization wastewater in thermal power plants is equally important. Due to the persistently high chloride ion content in the wastewater, huge sums of money are required annually for specialized treatment, which undoubtedly places a heavy burden on the operating costs of these enterprises.

[0005] Based on the high treatment costs of desulfurization wastewater from thermal power plants and the urgent need for long-term effective and efficient mold inhibitors during the rainy season, this invention proposes a mold inhibitor based on desulfurization wastewater modification, its preparation method, and its application. Summary of the Invention

[0006] The purpose of this invention is to provide a mold inhibitor based on desulfurization wastewater modification, its preparation method, and its application. The mold inhibitor of this invention uses desulfurization wastewater as the main component, which not only has the effect of long-term and efficient removal and inhibition of mold, but also reduces the treatment cost of desulfurization wastewater and the production cost of the mold inhibitor.

[0007] In a first aspect, the present invention provides a mold inhibitor based on desulfurization wastewater modification, comprising the following raw materials in parts by weight:

[0008] The solution contains 90-110 parts of desulfurization wastewater, 8-12 parts of chitosan, 5-8 parts of sodium lignosulfonate, 5-10 parts of quaternary ammonium salt disinfectant, and 0.001-0.002 parts of anionic flocculant.

[0009] As a preferred embodiment of this technical solution, the anionic flocculant includes any one of acrylamide and acrylate copolymer, anionic polyacrylamide, and sodium sulfate, and is preferably anionic polyacrylamide.

[0010] The use of anionic flocculants has several advantages. First, it effectively polymerizes suspended solids (such as particulate colloids) in desulfurization wastewater into large-volume, high-density, and rapidly settling flocs, significantly reducing the suspended solids content. Second, anionic flocculants effectively remove harmful substances such as sulfates, sulfites, COD, and fluorides from desulfurization wastewater. Third, desulfurization wastewater often has high color, and treatment with anionic flocculants can significantly reduce its color and improve its appearance. Finally, since the raw materials for anionic flocculants are mostly non-metallic minerals, they do not react chemically with desulfurization wastewater, thus preventing secondary pollution. Therefore, the desulfurization wastewater used in this invention is preferably desulfurization wastewater treated with anionic flocculants.

[0011] As a preferred embodiment of this technical solution, the chitosan is acid-soluble chitosan.

[0012] The pH of desulfurization wastewater is 5-6. Under acidic conditions, acid-soluble chitosan will undergo a certain degree of hydrolysis in the desulfurization wastewater, producing decomposition products such as glucosamine, which will then dissolve in the wastewater.

[0013] Furthermore, since the acid-soluble chitosan in this invention mainly functions to chelate metal ions and other substances in desulfurization wastewater, the concentration of acid-soluble chitosan in the mold inhibitor of this invention is crucial. If the concentration is too low, it will not be able to effectively encapsulate multiple active ingredients, while if the concentration is too high, the mold inhibitor will have too high a viscosity to be sprayed.

[0014] As a preferred embodiment of this technical solution, the quaternary ammonium salt disinfectant includes single-chain quaternary ammonium salt and double-chain quaternary ammonium salt, and the concentration of the quaternary ammonium salt disinfectant is 0.5%-1%.

[0015] The quaternary ammonium salt disinfectant of the present invention can be directly selected from commercially available quaternary ammonium salt disinfectants. It has certain bactericidal and mite-killing effects, but does not have long-term effectiveness.

[0016] The desulfurization wastewater of this invention can be directly used as untreated desulfurization wastewater from thermal power plants. This reduces the treatment cost of desulfurization wastewater and significantly improves resource utilization by recycling and reusing the wastewater, while also lowering the production cost of mold inhibitors. This invention does not strictly limit the water quality indicators of the desulfurization wastewater. Specifically, desulfurization wastewater with a chemical oxygen demand (COD) not exceeding 200 mg / L, ammonia nitrogen concentration not exceeding 15 mg / L, total phosphorus concentration not exceeding 1 mg / L, total nitrogen concentration not exceeding 20 mg / L, and biological oxygen demand (BOD) not exceeding 30 mg / L can be selected.

[0017] Secondly, the present invention also discloses a method for preparing the above-mentioned mold inhibitor, comprising the following steps:

[0018] S1. Add an aqueous solution of anionic flocculant to the desulfurization wastewater, stir, let stand, and take the supernatant of the desulfurization wastewater.

[0019] S2. Add acid-soluble chitosan, sodium lignosulfonate and quaternary ammonium salt disinfectant to the supernatant of desulfurization wastewater in sequence, stir evenly, and obtain mold inhibitor.

[0020] In the preparation method of this invention, firstly, a certain amount of anionic flocculant is added to the desulfurization wastewater, and after stirring and settling, the supernatant is taken for later use to reduce the suspended solids content and color of the wastewater, and improve the appearance of the water quality. Then, acid-soluble chitosan is added to the supernatant of the desulfurization wastewater. Since the chitosan molecular chain contains abundant active functional groups such as hydroxyl, carboxyl, and amino groups, the amino functional groups in the chitosan molecule can provide lone pairs of electrons to form coordination bonds with metal ions with empty d orbitals, thereby fixing the metal ions on the chitosan molecules. In addition, the coordination effect between chitosan and metal ions also helps the chitosan molecules form a stable network structure in the metal ion solution, thereby forming a chitosan-metal ion composite film. The formation of the chitosan-metal ion composite film can effectively reduce the loss of metal ions, allowing metal ions such as Cu and Zn ions to exert their bactericidal and antifungal capabilities for a long time. On this basis, acid-soluble chitosan is further added to the desulfurization wastewater. Sodium lignosulfonate is added to the mixed solution. The negatively charged sodium lignosulfonate and the positively charged chitosan combine through electrostatic attraction to form a stable structure, thus firmly adsorbing heavy metal ions in the desulfurization wastewater, resulting in a stronger film. Simultaneously, it enhances the UV blocking ability of the mold inhibitor and extends the lifespan of the core component. Finally, quaternary ammonium salt disinfectant is added to the mixed solution of desulfurization wastewater, acid-soluble chitosan, and sodium lignosulfonate. Since quaternary ammonium salt itself has the ability to generate a large amount of foam, thorough stirring produces a large amount of foam in the mixed solution. The gas pressure generated when the foam dissipates allows the liquid film of the quaternary ammonium salt solution to fully mix with the chitosan-metal ion composite film, achieving effective double-film coating of the quaternary ammonium salt component. At the same time, the desulfurization wastewater contains abundant chloride ions, which act as a water-retaining agent for the quaternary ammonium salt, preventing moisture leaching and further contributing to its long-term inhibitory effect on mold growth.

[0021] Therefore, the mold inhibitor prepared by the method of the present invention not only has the effect of long-term and efficient removal and inhibition of mold, but also reduces the treatment cost of desulfurization wastewater and the production cost of mold inhibitor.

[0022] In a preferred embodiment of this technical solution, in step S1, when the anionic flocculant used in this invention flocculates and precipitates suspended solids and other substances in the desulfurization wastewater, to fully utilize the flocculation effect of the anionic flocculant, the anionic flocculant can be fully dissolved first, and then the aqueous solution of the anionic flocculant can be added to the desulfurization wastewater. Specifically, the concentration of the aqueous solution of the anionic flocculant in this invention is 1.0-1.5 g / L. If the concentration of the anionic flocculant is too low, it cannot effectively remove suspended solids from the desulfurization wastewater; if the concentration of the anionic flocculant is too high, it will remove some heavy metal ions from the desulfurization wastewater, thereby affecting the bactericidal and antifungal properties of the desulfurization wastewater.

[0023] As a preferred embodiment of this technical solution, in step S1, the stirring time can be controlled to be 1-3 minutes, while the settling time can be controlled to be 3-10 minutes.

[0024] As a preferred embodiment of this technical solution, in step S2, after the acid-soluble chitosan is added, the mixture is stirred thoroughly until the acid-soluble chitosan is completely dissolved, and then sodium lignosulfonate is added; after the mixture is stirred thoroughly until the sodium lignosulfonate is completely dissolved, quaternary ammonium salt disinfectant is added.

[0025] After the quaternary ammonium salt disinfectant is added, it needs to be stirred thoroughly to generate a large amount of foam. The gas pressure generated after the foam dissipates will be used to fully mix the liquid film of the quaternary ammonium salt solution itself with the chitosan-metal ion composite film after the chitosan is dissolved, so as to achieve the effect of effective double-film coating of quaternary ammonium salt components, and finally obtain mold inhibitor.

[0026] Thirdly, the present invention also discloses the application of mold inhibitors in inhibiting and killing molds, which should also fall within the scope of protection of the present invention. The molds include any one or more of Aspergillus niger, Trichoderma longipes, Paecilomyces wani, Penicillium cordiformis, Chaetomium globosum, Aspergillus flavus, and Aspergillus fumigatus.

[0027] The mold inhibitor of the present invention has at least the following beneficial effects:

[0028] The mold inhibitor of this invention comprises desulfurization wastewater, chitosan, sodium lignosulfonate, quaternary ammonium salt disinfectant, and anionic flocculant. Desulfurization wastewater contains high levels of chloride ions and various heavy metal ions, including but not limited to mercury, copper, iron, zinc, and lead. Therefore, high costs are incurred annually to treat desulfurization wastewater. This invention uses desulfurization wastewater as the main component of the mold inhibitor. First, by mixing chitosan with the desulfurization wastewater, the metal ions and other substances in the wastewater are fully chelated. Furthermore, the film-forming properties of chitosan further prevent the loss of heavy metal ions such as Cu, thus utilizing metal ions as long-term inhibitors of mold growth. Second, both chitosan and sodium lignosulfonate are natural high-molecular-weight polyelectrolytes. Chitosan carries a positive charge under acidic conditions, while sodium lignosulfonate carries a negative charge in solution. Due to the electrostatic attraction of the charge, sodium lignosulfonate can combine with chitosan to form a stable structure, thereby firmly adsorbing heavy metal ions in desulfurization wastewater, resulting in stronger film strength. Simultaneously, it enhances the UV blocking ability of the mold inhibitor, extending the lifespan of the core component. Furthermore, the core component of the quaternary ammonium salt disinfectant, quaternary ammonium salt itself, has the ability to generate a large amount of foam. The gas pressure generated when the quaternary ammonium salt foam dissipates allows the liquid film of the quaternary ammonium salt solution itself to fully mix with the chitosan-metal ion composite film formed after the chitosan dissolves, achieving a double-film effective coating of the quaternary ammonium salt component, thus giving the quaternary ammonium salt a long-term inhibitory effect on mold growth. Finally, the desulfurization wastewater used in this invention contains abundant chloride ions, which can act as a water-retaining agent for the quaternary ammonium salt, allowing it to retain moisture for a long time without precipitation. Studies have shown that the mold inhibitor of this invention has a long-term, highly effective removal and inhibition effect on common molds such as Aspergillus niger, Trichoderma longipes, and Paecilomyces wani. Therefore, the mold inhibitor of the present invention uses desulfurization wastewater as the main component, which not only has the effect of long-term and efficient removal and inhibition of mold, but also reduces the treatment cost of desulfurization wastewater and the production cost of mold inhibitor. Detailed Implementation

[0029] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0030] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations according to this application. As used herein, the singular form includes the plural form unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this description, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0031] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. 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.

[0032] The quaternary ammonium salt disinfectant used in this invention was purchased from a manufacturer in Nanjing or Qingdao, with batch number 4292-25-5.

[0033] Example 1

[0034] S1. First, add 0.6g of anionic polyacrylamide to 500mL of water and stir until fully dissolved to obtain an aqueous solution of anionic polyacrylamide with a concentration of 1.2g / L; add 10mL of anionic flocculant aqueous solution to 1L of desulfurization wastewater from a thermal power plant, stir fully for 1-3min, let stand for 5-10min, and take the supernatant of the desulfurization wastewater for later use.

[0035] S2. Add 100g of acid-soluble chitosan to the supernatant of the desulfurization wastewater and stir thoroughly until the acid-soluble chitosan is completely dissolved. Then add 60g of sodium lignosulfonate and stir thoroughly until the sodium lignosulfonate is completely dissolved. Finally, add 60g of 1% quaternary ammonium salt disinfectant solution and stir thoroughly to generate a large amount of foam. After the foam disappears, the mold inhibitor is obtained.

[0036] Example 2

[0037] S1. First, add 0.75g of anionic polyacrylamide to 500mL of water and stir until fully dissolved to obtain an aqueous solution of anionic polyacrylamide with a concentration of 1.5g / L; add 10mL of anionic flocculant aqueous solution to 1L of desulfurization wastewater from a thermal power plant, stir fully for 1-3min, let stand for 5-10min, and take the supernatant of the desulfurization wastewater for later use.

[0038] S2. Add 80g of acid-soluble chitosan to the supernatant of the desulfurization wastewater and stir thoroughly until the acid-soluble chitosan is completely dissolved. Then add 50g of sodium lignosulfonate and stir thoroughly until the sodium lignosulfonate is completely dissolved. Finally, add 50g of 1% quaternary ammonium salt disinfectant solution and stir thoroughly to generate a large amount of foam. After the foam disappears, the mold inhibitor is obtained.

[0039] Example 3

[0040] S1. First, add 0.5g of anionic polyacrylamide to 500mL of water and stir until fully dissolved to obtain an aqueous solution of anionic polyacrylamide with a concentration of 1.0g / L; add 10mL of anionic flocculant aqueous solution to 1L of desulfurization wastewater from a thermal power plant, stir fully for 1-3min, let stand for 5-10min, and take the supernatant of the desulfurization wastewater for later use.

[0041] S2. Add 120g of acid-soluble chitosan to the supernatant of the desulfurization wastewater and stir thoroughly until the acid-soluble chitosan is completely dissolved. Then add 80g of sodium lignosulfonate and stir thoroughly until the sodium lignosulfonate is completely dissolved. Finally, add 100g of 0.5% quaternary ammonium salt disinfectant solution and stir thoroughly to generate a large amount of foam. After the foam disappears, the mold inhibitor is obtained.

[0042] Example 4

[0043] S1. First, add 0.6g of anionic polyacrylamide to 500mL of water and stir until fully dissolved to obtain an aqueous solution of anionic polyacrylamide with a concentration of 1.2g / L; add 10mL of anionic flocculant aqueous solution to 1L of desulfurization wastewater from a thermal power plant, stir fully for 1-3min, let stand for 5-10min, and take the supernatant of the desulfurization wastewater for later use.

[0044] S2. Add 90g of acid-soluble chitosan to the supernatant of the desulfurization wastewater and stir thoroughly until the acid-soluble chitosan is completely dissolved. Then add 70g of sodium lignosulfonate and stir thoroughly until the sodium lignosulfonate is completely dissolved. Finally, add 70g of 1% quaternary ammonium salt disinfectant solution and stir thoroughly to generate a large amount of foam. After the foam disappears, the mold inhibitor is obtained.

[0045] Example 5

[0046] S1. First, add 0.6g of anionic polyacrylamide to 500mL of water and stir until fully dissolved to obtain an aqueous solution of anionic polyacrylamide with a concentration of 1.2g / L; add 10mL of anionic flocculant aqueous solution to 1L of desulfurization wastewater from a thermal power plant, stir fully for 1-3min, let stand for 5-10min, and take the supernatant of the desulfurization wastewater for later use.

[0047] S2. Add 110g of acid-soluble chitosan to the supernatant of the desulfurization wastewater and stir thoroughly until the acid-soluble chitosan is completely dissolved. Then add 65g of sodium lignosulfonate and stir thoroughly until the sodium lignosulfonate is completely dissolved. Finally, add 65g of 0.8% quaternary ammonium salt disinfectant solution and stir thoroughly to generate a large amount of foam. After the foam disappears, the mold inhibitor is obtained.

[0048] Example 6

[0049] S1. First, add 0.6g of anionic polyacrylamide to 500mL of water and stir until fully dissolved to obtain an aqueous solution of anionic polyacrylamide with a concentration of 1.2g / L; add 10mL of anionic flocculant aqueous solution to 1L of desulfurization wastewater from a thermal power plant, stir fully for 1-3min, let stand for 5-10min, and take the supernatant of the desulfurization wastewater for later use.

[0050] S2. Add 100g of acid-soluble chitosan to the supernatant of the desulfurization wastewater and stir thoroughly until the acid-soluble chitosan is completely dissolved. Then add 80g of sodium lignosulfonate and stir thoroughly until the sodium lignosulfonate is completely dissolved. Finally, add 70g of 1% quaternary ammonium salt disinfectant solution and stir thoroughly to generate a large amount of foam. After the foam disappears, the mold inhibitor is obtained.

[0051] Compare with Example 1

[0052] A 75% aqueous alcohol solution was used as a mold inhibitor.

[0053] Compare with Example 2

[0054] A 0.2% guanidine salt aqueous solution was used as a mold inhibitor.

[0055] Compare with Example 3

[0056] A 0.2% (w / w) quaternary ammonium salt aqueous solution was used as a mold inhibitor.

[0057] Compare with Example 4

[0058] A mixed aqueous solution of 8% (w / w) acid-soluble chitosan and 0.2% (w / w) quaternary ammonium salt was used as a mold inhibitor.

[0059] Compare with Example 5

[0060] An aqueous solution of a 0.2% (w / w) quaternary ammonium salt bactericide was used as a mold inhibitor.

[0061] Compare with Example 6

[0062] This is basically the same as Example 1, except that sodium lignosulfonate was not added in this comparative example.

[0063] Compare with Example 7

[0064] The example is basically the same as Example 1, except that the desulfurization wastewater used in this comparative example is desulfurization wastewater after the wastewater has been treated to remove chloride ions, and the concentration of chloride ions in the desulfurization wastewater is 4000mg / L-5000mg / L.

[0065] Experimental Example 1

[0066] This invention refers to GBT24128-2018 "Evaluation of the anti-mold effect of plastic anti-mold agents" to evaluate the anti-mold effect of the mold inhibitors in Example 1 and Comparative Examples 1-7 above.

[0067] The specific testing method is as follows:

[0068] 1. Test the types of microorganisms and culture conditions:

[0069] Aspergillus niger CGMCC 3.3928

[0070] Penicillium wani CGMCC 3.4253

[0071] Penicillium cordiformis CGMCC 3.3875

[0072] Chaetomium globulus CGMCC 3.3601

[0073] The above-mentioned microorganisms were cultured according to the culture conditions specified in 5.3.2 of GBT24128-2018 "Evaluation of the anti-mold effect of plastic anti-mold agents".

[0074] 2. Preparation of test samples

[0075] Cut circular specimens with a diameter of 1-4 cm from each test sample, with a thickness not exceeding 10 mm. After cleaning, the specimens are stored separately in petri dishes. Three specimens are prepared for each test sample for testing and evaluation.

[0076] 3. Testing Steps

[0077] After sterilization, pour 20 mL of nutrient agar into each petri dish and allow it to solidify and dry until there is no moisture on the surface;

[0078] Place the samples as flat as possible in the middle of the solidified culture medium;

[0079] The samples were inoculated and cultured according to the method in 8.4 of GBT24128-2018 "Evaluation of the anti-mold effect of plastic anti-mold agents". After the culture was completed, the sample surface was sprayed with mold inhibitor. After the mold was eliminated, the mold growth was evaluated at 1 day, 1 week, 1 month, 1 year and 2 years.

[0080] For each microorganism, select one untreated sample that is known to be susceptible to mold attack as a control.

[0081] 4. Mold growth assessment

[0082] Refer to the requirements in Table 1 to assess the mold growth on the surface and around each sample, and describe the visual assessment results of each sample based on the mold growth level given in Table 1 (Table 2).

[0083] Table 1 Mold growth status

[0084] grade Mold growth 0 No growth 1 Initial growth (compared to the rest of the agar surface) 2 Obvious growth and spore production

[0085] Table 2 Mildew Resistance Rating

[0086]

[0087]

[0088] 5. Test Results

[0089] The antifungal effects of the mold inhibitors in Example 1 and Control Examples 1-7 of this invention on different microorganisms are shown in Tables 3-6.

[0090] Table 3. Antifungal effect of mold inhibitors on Aspergillus niger.

[0091] 1 day 1 week 1 month 1 year 2 years Example 1 0 0 0 0 0 Compare with Example 1 0 1 2 — — Compare with Example 2 0 0 1 2 — Compare with Example 3 0 0 0 2 — Compare with Example 4 0 0 1 2 — Compare with Example 5 0 0 0 2 — Compare with Example 6 0 0 0 1 2 Compare with Example 7 0 0 1 2 —

[0092] Table 4. Antifungal effects of fungicide inhibitors on *Penicillium wanyi*.

[0093]

[0094]

[0095] Table 5. Antifungal effect of fungicide inhibitors on Penicillium cordiformis.

[0096] 1 day 1 week 1 month 1 year 2 years Example 1 0 0 0 0 0 Compare with Example 1 0 1 2 — — Compare with Example 2 0 0 1 2 — Compare with Example 3 0 0 1 2 — Compare with Example 4 0 0 1 2 — Compare with Example 5 0 0 0 2 — Compare with Example 6 0 0 0 1 2 Compare with Example 7 0 0 1 2 —

[0097] Table 6. Antifungal effect of mold inhibitors on Chaetomium globulus

[0098]

[0099]

[0100] As shown in Tables 3-6, the mold inhibitor prepared in this invention has a long-term and highly effective removal and inhibition effect on common molds such as Aspergillus niger, Paecilomyces wani, Penicillium cordiformis, and Chaetomium globulus compared with the control examples 1-7.

[0101] Experimental Example 2

[0102] The present invention further verified the anti-mold effect of the mold inhibitor in Example 1 and Comparative Examples 1-7 using a moldy furniture board.

[0103] The specific testing method is as follows:

[0104] Mold inhibitors were sprayed on moldy wooden boards of the same size. After the mold spots disappeared, the mold growth was evaluated at 1 day, 1 week, 1 month, 1 year and 2 years. The results are shown in Table 7.

[0105] Table 7. Antifungal effect of mold inhibitors on moldy wooden boards.

[0106] 1 day 1 week 1 month 1 year 2 years Example 1 0 0 0 0 0 Compare with Example 1 0 1 2 — — Compare with Example 2 0 0 1 2 — Compare with Example 3 0 0 1 2 — Compare with Example 4 0 0 1 2 — Compare with Example 5 0 0 0 2 — Compare with Example 6 0 0 0 1 2 Compare with Example 7 0 0 1 2 —

[0107] Table 7 further shows that the mold inhibitor prepared in this invention has a long-term and highly effective removal and inhibition effect on mold spots compared with control examples 1-7.

[0108] In summary, the mold inhibitor of the present invention uses desulfurization wastewater as the main component, which not only has the effect of long-term and efficient removal and inhibition of mold, but also reduces the treatment cost of desulfurization wastewater and the production cost of mold inhibitor.

[0109] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a mold inhibitor based on desulfurization wastewater modification, characterized in that, Includes the following steps: S1. Add an aqueous solution of anionic flocculant to desulfurization wastewater containing a high chloride ion content, stir, let stand, and take the supernatant of desulfurization wastewater. S2. Add acid-soluble chitosan, sodium lignosulfonate and quaternary ammonium salt disinfectant to the supernatant of desulfurization wastewater in sequence, stir evenly to obtain mold inhibitor; The mold inhibitor comprises the following raw materials in parts by weight: The solution contains 90-110 parts of desulfurization wastewater, 8-12 parts of acid-soluble chitosan, 5-8 parts of sodium lignosulfonate, 5-10 parts of quaternary ammonium salt disinfectant, and 0.001-0.002 parts of anionic flocculant.

2. The method for preparing the mold inhibitor according to claim 1, characterized in that, The anionic flocculant includes any one of acrylamide and acrylate copolymers and anionic polyacrylamide.

3. The method for preparing the mold inhibitor according to claim 1, characterized in that, The quaternary ammonium salt disinfectant includes single-chain quaternary ammonium salts and double-chain quaternary ammonium salts, and the mass concentration of the quaternary ammonium salt disinfectant is 0.5%-1%.

4. The method for preparing the mold inhibitor according to claim 1, characterized in that, The water quality indicators for the desulfurization wastewater are as follows: chemical oxygen demand not exceeding 200 mg / L, ammonia nitrogen concentration not exceeding 15 mg / L, total phosphorus concentration not exceeding 1 mg / L, total nitrogen concentration not exceeding 20 mg / L, and biological oxygen demand not exceeding 30 mg / L.

5. The method for preparing the mold inhibitor according to claim 1, characterized in that, In step S1, the concentration of the aqueous solution of the anionic flocculant is 1.0-1.5 g / L.

6. The method for preparing the mold inhibitor according to claim 1, characterized in that, In step S1, the stirring time is controlled to be 1-3 minutes. During the settling period, the control time is 3-10 minutes.

7. The method for preparing the mold inhibitor according to claim 1, characterized in that, In step S2, after the acid-soluble chitosan is added, it is stirred thoroughly until the acid-soluble chitosan is completely dissolved, and then sodium lignosulfonate is added; after stirring thoroughly until the sodium lignosulfonate is completely dissolved, quaternary ammonium salt disinfectant is added. After the quaternary ammonium salt disinfectant is added, it is stirred thoroughly to generate foam. After the foam disappears, the mold inhibitor is obtained.

8. A mold inhibitor based on desulfurization wastewater modification, characterized in that, The mold inhibitor was prepared according to any one of claims 1-7.

9. The application of the mold inhibitor according to claim 8 in inhibiting and killing mold, characterized in that, The molds include any one or more of Aspergillus niger, Trichoderma longipes, Penicillium wansii, Penicillium cordiformis, Chaetomium globosum, Aspergillus flavus, and Aspergillus fumigatus.

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