A decontamination wastewater detoxification composition and methods of use thereof

Abstract

This invention provides a composition for the harmless treatment of decontamination wastewater and its application method. The composition is made of a main reactant, a co-reactant, a solvent, and a superstable mineralizing agent. The mass ratio of the main reactant, co-reactant, solvent, and superstable mineralizing agent is 1:0.05-0.1:5-7.5:0.2-0.4. The main reactant is Na2SO3, and the co-reactant is one or more of CH3COOH, K2C2O4·H2O, (NH4)2Fe(SO4)2·6H2O, and NaHSO3. The solvent is deionized water. This invention adds a superstable mineralizing agent to the original main reactant, co-reactant, and solvent, which greatly improves the removal efficiency of the composition for available chlorine. The superstable mineralizing agent adsorbs and controls sulfite ions within its crystal structure, achieving a slow release of sulfite ions in the reaction system, significantly reducing the intensity of the reaction, effectively reducing the amount of composition used, and greatly reducing costs.

Description

Technical Field

[0001] This invention belongs to the field of wastewater treatment technology, and in particular relates to a composition for the harmless treatment of decontamination wastewater and its application method. Background Technology

[0002] Currently, in the field of public safety, decontamination agents are widely and commonly used to meet public safety needs. Among these, bleaching powder (also known as calcium hypochlorite) is the most prevalent. Bleaching powder is widely used due to its rapid effectiveness and good specific decontamination results, and it can even be used as a targeted disinfectant in some special fields, such as in cases of large-scale radioactive material leaks. However, with the widespread use of bleaching powder as a decontamination agent, the wastewater contains a large amount of substances that cannot be naturally degraded. Since the main carrier of bleaching powder is sodium hypochlorite or calcium hypochlorite, and its active ingredient is hypochlorous acid obtained from the hydrolysis of sodium hypochlorite or calcium hypochlorite, some residual hypochlorous acid has strong oxidizing properties and requires further treatment.

[0003] The publication document of Chinese invention application CN113402006A discloses a composition for the efficient and harmless treatment of decontamination wastewater and its method of use. The composition can effectively reduce hypochlorite to chloride ions. Although it reduces the oxidizing properties of the residual solution, its treatment capacity is relatively weak and the consumption during use is large. The amount required is three-tenths to one-half of the liquid to be treated. If large-scale treatment is required, the cost is high. Summary of the Invention

[0004] The problem this invention aims to solve is to provide a composition for the harmless treatment of decontamination wastewater. This composition, based on the original main reactants, auxiliary reactants, and solvents, adds a super-stable mineralizer, significantly improving the removal efficiency of available chlorine. The super-stable mineralizer adsorbs and controls sulfite ions within its crystal structure, achieving a slow release of sulfite ions during the reaction system, greatly reducing the intensity of the reaction, thereby improving the chlorine removal effect of the composition, effectively reducing the amount of composition used, and significantly lowering costs.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a composition for the harmless treatment of decontamination wastewater, which is made of a main reactant, an auxiliary reactant, a solvent and an ultra-stable mineralizer, wherein the mass ratio of the main reactant, the auxiliary reactant, the solvent and the ultra-stable mineralizer is 1:0.05-0.1:5-7.5:0.2-0.4;

[0006] The main reactant is Na2SO3, the auxiliary reactant is one or more of CH3COOH, K2C2O4·H2O, (NH4)2Fe(SO4)2·6H2O, and NaHSO3, and the solvent is deionized water.

[0007] Furthermore, the superstable mineralizer is prepared by the following steps: a metal salt solution and an alkaline solution are rapidly poured into a microfilm reactor, the resulting slurry is transferred to a crystallization kettle and crystallized at 100-120°C for 8-10 hours, the precipitate obtained by centrifugation is dispersed and washed with deionized water and then centrifuged again, and the precipitate is placed in an oven at 30-40°C and dried for 2-5 hours to obtain the superstable mineralizer.

[0008] Furthermore, in preparing the superstable mineralizer, the metal salt in the metal salt solution is magnesium nitrate, magnesium chloride, magnesium sulfate, or magnesium hydroxide, the alkaline solution is a 1 mol / L sodium aluminate solution, and the molar ratio of the metal element to sodium aluminate in the metal salt solution is 1.5-3:1.

[0009] Furthermore, the co-reactant is CH3COOH, and the mass ratio of Na2SO3, CH3COOH, deionized water, and ultrastable mineralizer is 1:0.05:6-7:0.3-0.35.

[0010] Furthermore, the co-reactant is K2C2O4·H2O, and the mass ratio of Na2SO3, K2C2O4·H2O, deionized water, and ultrastable mineralizer is 1:0.1:5:0.3.

[0011] Furthermore, the co-reactants are (NH4)2Fe(SO4)2·6H2O and NaHSO3, and the mass ratio of Na2SO3, (NH4)2Fe(SO4)2·6H2O, NaHSO3, deionized water and superstable mineralizer is 1:0.03:0.03:5:0.3.

[0012] Furthermore, the co-reactants are CH3COOH and NaHSO3, and the mass ratio of Na2SO3, CH3COOH, NaHSO3, deionized water and ultrastable mineralizer is 1:0.05:0.02:6.5:0.4.

[0013] The second objective of this invention is to provide a method for using a composition for the harmless treatment of decontamination wastewater, the method comprising the following steps: mixing the composition for the harmless treatment of decontamination wastewater with the liquid to be treated at a volume ratio of 5:0.8-1.4.

[0014] Furthermore, the volume ratio of the wastewater harmless treatment composition to the liquid to be treated is 5:0.8-1.0.

[0015] The advantages and positive effects of this invention are:

[0016] The wastewater harmless treatment composition of the present invention adds a super-stable mineralizer to the original main reactant, auxiliary reactant and solvent, which greatly improves the removal effect of the composition on available chlorine. The super-stable mineralizer adsorbs and controls sulfite ions within its crystal structure. During the reaction, sulfite ions are released slowly, which greatly reduces the intensity of the reaction, effectively reduces the amount of composition used, and greatly reduces the cost. Detailed Implementation

[0017] The present invention will now be described in detail with reference to specific embodiments.

[0018] Example 1:

[0019] A composition for the harmless treatment of decontamination wastewater is prepared by the following steps:

[0020] Preparation of ultrastable mineralizer: Magnesium nitrate solution and 1 mol / L sodium aluminate solution were poured into a microfilm reactor. The resulting slurry was transferred to a crystallization vessel and crystallized at 100℃ for 8 hours. The precipitate obtained by centrifugation was washed with deionized water and then centrifuged again. The precipitate was dried in an oven at 40℃ for 2 hours to obtain the ultrastable mineralizer. The magnesium element in the magnesium nitrate solution was added to sodium aluminate at a molar ratio of 1.5:1.

[0021] To prepare a harmless treatment composition for decontamination wastewater, Na2SO3, CH3COOH, deionized water, and a super-stable mineralizer were weighed separately in a weight ratio of 1:0.05:5:0.2, mixed, and stirred evenly to obtain the harmless treatment composition for decontamination wastewater.

[0022] Example 2:

[0023] A composition for the harmless treatment of decontamination wastewater is prepared by the following steps:

[0024] Preparation of ultrastable mineralizer: Magnesium nitrate solution and 1 mol / L sodium aluminate solution were poured into a microfilm reactor. The resulting slurry was transferred to a crystallization vessel and crystallized at 120℃ for 8 hours. The precipitate obtained by centrifugation was washed with deionized water and then centrifuged again. The precipitate was dried in an oven at 40℃ for 3 hours to obtain the ultrastable mineralizer. In this process, magnesium element in magnesium nitrate solution was added to sodium aluminate at a molar ratio of 3:1.

[0025] To prepare a harmless treatment composition for decontamination wastewater, Na2SO3, CH3COOH, deionized water, and a super-stable mineralizer were weighed separately in a weight ratio of 1:0.05:5:0.2, mixed, and stirred evenly to obtain the harmless treatment composition for decontamination wastewater.

[0026] Example 3:

[0027] A composition for the harmless treatment of decontamination wastewater is prepared by the following steps:

[0028] Preparation of ultrastable mineralizer: Magnesium nitrate solution and 1 mol / L sodium aluminate solution were poured into a microfilm reactor. The resulting slurry was transferred to a crystallization vessel and crystallized at 100℃ for 10 hours. The precipitate obtained by centrifugation was washed with deionized water and then centrifuged again. The precipitate was dried in an oven at 30℃ for 5 hours to obtain the ultrastable mineralizer. The magnesium element in the magnesium nitrate solution was added to sodium aluminate at a molar ratio of 1.5:1.

[0029] To prepare a harmless treatment composition for decontamination wastewater, Na2SO3, CH3COOH, deionized water, and a super-stable mineralizer were weighed separately in a weight ratio of 1:0.1:7.5:0.4, mixed, and stirred evenly to obtain the harmless treatment composition for decontamination wastewater.

[0030] Example 4:

[0031] A composition for the harmless treatment of decontamination wastewater is prepared by the following steps:

[0032] Preparation of ultrastable mineralizer: Magnesium nitrate solution and 1 mol / L sodium aluminate solution were poured into a microfilm reactor. The resulting slurry was transferred to a crystallization vessel and crystallized at 110℃ for 8 hours. The precipitate obtained by centrifugation was washed with deionized water and then centrifuged again. The precipitate was dried in an oven at 35℃ for 3 hours to obtain the ultrastable mineralizer. The magnesium element in the magnesium nitrate solution was added to sodium aluminate at a molar ratio of 1.5:1.

[0033] To prepare a harmless treatment composition for decontamination wastewater, Na2SO3, CH3COOH, deionized water, and a super-stable mineralizer were weighed separately in a weight ratio of 1:0.05:6:0.3, mixed, and stirred evenly to obtain the harmless treatment composition for decontamination wastewater.

[0034] Example 5:

[0035] A composition for the harmless treatment of decontamination wastewater is prepared by the following steps:

[0036] Preparation of ultrastable mineralizer: Magnesium nitrate solution and 1 mol / L sodium aluminate solution were poured into a microfilm reactor. The resulting slurry was transferred to a crystallization vessel and crystallized at 100℃ for 8 hours. The precipitate obtained by centrifugation was washed with deionized water and then centrifuged again. The precipitate was dried in an oven at 40℃ for 2 hours to obtain the ultrastable mineralizer. The magnesium element in the magnesium nitrate solution was added to sodium aluminate at a molar ratio of 1.5:1.

[0037] To prepare a harmless treatment composition for decontamination wastewater, Na2SO3, CH3COOH, deionized water, and a super-stable mineralizer were weighed separately in a weight ratio of 1:0.05:7:0.35, mixed, and stirred evenly to obtain the harmless treatment composition for decontamination wastewater.

[0038] Example 6:

[0039] A composition for the harmless treatment of decontamination wastewater is prepared by the following steps:

[0040] Preparation of ultrastable mineralizer: Magnesium nitrate solution and 1 mol / L sodium aluminate solution were poured into a microfilm reactor. The resulting slurry was transferred to a crystallization vessel and crystallized at 100℃ for 8 hours. The precipitate obtained by centrifugation was washed with deionized water and then centrifuged again. The precipitate was dried in an oven at 40℃ for 2 hours to obtain the ultrastable mineralizer. The magnesium element in the magnesium nitrate solution was added to sodium aluminate at a molar ratio of 1.5:1.

[0041] To prepare a harmless treatment composition for decontamination wastewater, Na2SO3, K2C2O4·H2O, deionized water, and ultra-stable mineralizer were weighed separately in a weight ratio of 1:0.1:5:0.3, mixed, and stirred evenly to obtain the harmless treatment composition for decontamination wastewater.

[0042] Example 7:

[0043] A composition for the harmless treatment of decontamination wastewater is prepared by the following steps:

[0044] Preparation of ultrastable mineralizer: Magnesium nitrate solution and 1 mol / L sodium aluminate solution were poured into a microfilm reactor. The resulting slurry was transferred to a crystallization vessel and crystallized at 100℃ for 8 hours. The precipitate obtained by centrifugation was washed with deionized water and then centrifuged again. The precipitate was dried in an oven at 40℃ for 2 hours to obtain the ultrastable mineralizer. The magnesium element in the magnesium nitrate solution was added to sodium aluminate at a molar ratio of 1.5:1.

[0045] To prepare a harmless treatment composition for decontamination wastewater, Na2SO3, (NH4)2Fe(SO4)2·6H2O, NaHSO3, deionized water, and a super-stable mineralizer were weighed separately according to a weight ratio of 1:0.03:0.03:5:0.3, mixed, and stirred evenly to obtain the harmless treatment composition for decontamination wastewater.

[0046] Example 8:

[0047] A composition for the harmless treatment of decontamination wastewater is prepared by the following steps:

[0048] Preparation of ultrastable mineralizer: Magnesium nitrate solution and 1 mol / L sodium aluminate solution were poured into a microfilm reactor. The resulting slurry was transferred to a crystallization vessel and crystallized at 100℃ for 8 hours. The precipitate obtained by centrifugation was washed with deionized water and then centrifuged again. The precipitate was dried in an oven at 40℃ for 2 hours to obtain the ultrastable mineralizer. The magnesium element in the magnesium nitrate solution was added to sodium aluminate at a molar ratio of 1.5:1.

[0049] To prepare a harmless treatment composition for decontamination wastewater, Na2SO3, CH3COOH, NaHSO3, deionized water, and a super-stable mineralizer were weighed separately according to a weight ratio of 1:0.05:0.02:6.5:0.4, mixed, and stirred evenly to obtain the harmless treatment composition for decontamination wastewater.

[0050] Comparative Example 1:

[0051] This comparative example uses the technical solution of Example 1 of CN113402006A to prepare the corresponding composition.

[0052] Comparative Example 2:

[0053] This comparative example uses the technical solution of Example 1 of CN113307316A to prepare the corresponding composition.

[0054] Experimental Example 1:

[0055] 1. Prepare the test solution and determine the corresponding available chlorine content:

[0056] Four different grades of bleaching powder solutions (1:4, 1:8, 1:12, and 1:16) were prepared, and their available chlorine content was determined using a portable rapid available chlorine analyzer. The results are shown in Table 1.

[0057] The bleaching powder (1:4) solution was prepared by adding 20.0063g of bleaching powder solid to 80ml of deionized water.

[0058] The bleaching powder (1:8) solution was prepared by adding 10.0023g of bleaching powder solid to 80ml of deionized water;

[0059] The bleaching powder (1:12) solution was prepared by adding 80 ml of deionized water to 6.6693 g of bleaching powder solid.

[0060] The bleaching powder solution (1:16) was prepared by adding 5g of bleaching powder solid to 80ml of deionized water.

[0061] Table 1. Available chlorine content of bleaching powder solution

[0062]

[0063]

[0064] 2. Dechlorination and testing:

[0065] The composition prepared in Example 1 was reacted with bleaching powder solution at different volume addition ratios (composition: bleaching powder solution). After the reaction, the pH and available chlorine content of the solution were measured, and the results are shown in Table 2.

[0066] Table 2 shows the results of pH and available chlorine content tests on the solution after the reaction.

[0067]

[0068]

[0069] As shown in Tables 1 and 2, when using the composition of Example 1 to treat bleaching powder solutions with a mixing ratio of (1:16) to (1:8), the effective chlorine in the bleaching powder solution can be effectively removed while maintaining a neutral pH, when the ratio of the composition to the bleaching powder solution is (0.5-0.8):5. Therefore, when treating normal wastewater, a volume ratio of 0.5:5 for the composition for the harmless treatment of decontamination wastewater can be used. If the effective chlorine content is high, the dosage of the composition for the harmless treatment of decontamination wastewater of this invention can be appropriately increased to accelerate the reaction.

[0070] Furthermore, the same tests were performed on several other embodiments of the present invention, and the results were similar to those of Embodiment 1.

[0071] Experimental Example 2:

[0072] The compositions prepared using Comparative Examples 1 and 2 were reacted with bleaching powder (1:8) solution at different volume addition ratios. After the reaction, the pH and available chlorine content of the solution were measured, and the results are shown in Table 3.

[0073] Table 3 shows the pH and available chlorine content of the solutions after the comparative reaction.

[0074]

[0075]

[0076] By comparing Tables 2 and 3, it can be seen that the dechlorination capacity of the wastewater harmless treatment composition of the present invention is strong. Compared with the compositions in Comparative Examples 1 and 2 of the prior art, the amount used can be reduced. As can be seen from the experimental data in Table 3, when Comparative Examples 1 and 2 treat the effective chlorine to below 1000 mg / L, the amount of their compositions added is at least 40% of the liquid to be treated, which is a large amount and has a high cost. However, the wastewater harmless treatment composition of the present invention only requires 10% of the liquid to be treated, which effectively reduces the amount used and thus reduces the cost.

[0077] The specific embodiments of the present invention have been described in detail above, but the content described is only a preferred embodiment of the present invention and should not be considered as limiting the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A composition for the harmless treatment of decontamination wastewater, characterized in that: It is made from main reactants, auxiliary reactants, solvents and ultrastable mineralizers, wherein the mass ratio of main reactants, auxiliary reactants, solvents and ultrastable mineralizers is 1:0.05-0.1:5-7.5:0.2-0.4; The main reactant is Na2SO3, and the auxiliary reactants are one or more of CH3COOH, K2C2O4·H2O, (NH4)2Fe(SO4)2·6H2O, and NaHSO3. The solvent is deionized water. The ultrastable mineralizer is prepared by the following steps: a metal salt solution and an alkaline solution are rapidly poured into a microfilm reactor, and the resulting slurry is transferred to a crystallization kettle and crystallized at 100-120℃ for 8-10 hours. The precipitate obtained by centrifugation is dispersed and washed with deionized water and then centrifuged again. The precipitate is placed in an oven at 30-40℃ and dried for 2-5 hours to obtain the ultrastable mineralizer. When preparing the ultrastable mineralizer, the metal salt in the metal salt solution is magnesium nitrate, magnesium chloride, magnesium sulfate, or magnesium hydroxide, and the alkaline solution is a 1 mol / L sodium aluminate solution. The molar ratio of the metal element in the metal salt solution to sodium aluminate is 1.5-3:

1.

2. The composition for harmless treatment of decontamination wastewater according to claim 1, characterized in that: The co-reactant is CH3COOH, and the mass ratio of Na2SO3, CH3COOH, deionized water and ultrastable mineralizer is 1:0.05:6-7:0.3-0.

35.

3. The composition for harmless treatment of decontamination wastewater according to claim 2, characterized in that: The co-reactant is K2C2O4·H2O, and the mass ratio of Na2SO3, K2C2O4·H2O, deionized water and ultrastable mineralizer is 1:0.1:5:0.

3.

4. The composition for harmless treatment of decontamination wastewater according to claim 1, characterized in that: The co-reactants are (NH4)2Fe(SO4)2·6H2O and NaHSO3, and the mass ratio of Na2SO3, (NH4)2Fe(SO4)2·6H2O, NaHSO3, deionized water and superstable mineralizer is 1:0.03:0.03:5:0.

3.

5. The composition for harmless treatment of decontamination wastewater according to claim 1, characterized in that: The co-reactants are CH3COOH and NaHSO3, and the mass ratio of Na2SO3, CH3COOH, NaHSO3, deionized water and ultrastable mineralizer is 1:0.05:0.02:6.5:0.

4.

6. A method of using the composition for harmless treatment of decontamination wastewater as described in any one of claims 1-5, characterized in that: The method of use includes the following steps: the wastewater harmless treatment composition and the liquid to be treated are mixed at a volume ratio of (0.5-0.8):

5.

7. The method of using the composition for harmless treatment of decontamination wastewater according to claim 6, characterized in that: The volume ratio of the wastewater harmless treatment composition to the liquid to be treated is (0.5-0.6):5.

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