Efficient harmless treatment composition for decontamination wastewater and use method thereof
1. A high-efficiency harmless treatment composition for decontamination wastewater is characterized in that: the composition comprises the following components in percentage by weight: a main reactant, an auxiliary reactant and a solvent, wherein the main reactant adopts Na2SO3The auxiliary reactant adopts CH3COOH、K2C2O4·H2O、(NH4)2Fe(SO4)2·6H2O、NaHSO3The solvent is deionized water, and the mass ratio of the main reactant to the auxiliary reactant to the solvent is 1:0.05-0.1: 5-7.5.
2. The high-efficiency harmless treatment composition for decontamination wastewater according to claim 1, which comprises: the auxiliary reactant adopts CH3COOH。
3. The high-efficiency harmless treatment composition for decontamination wastewater according to claim 2, characterized in that: the Na is2SO3、CH3The mass ratio of COOH to deionized water is 1:0.05: 5-7.5.
4. The high-efficiency harmless treatment composition for decontamination wastewater according to claim 3, wherein: the auxiliary reactant adopts NaHSO3。
5. The high-efficiency harmless treatment composition for decontamination wastewater according to claim 2, characterized in that: the Na is2SO3、NaHSO3And the mass ratio of the deionized water is 1:0.06: 5.
6. The high-efficiency harmless treatment composition for decontamination wastewater according to claim 5, wherein: the auxiliary reactant adopts K2C2O4·H2O and (NH)4)2Fe(SO4)2·6H2O, the Na2SO3、K2C2O4·H2O、(NH4)2Fe(SO4)2·6H2The mass ratio of O to deionized water is 1:0.02:0.08: 5.
7. The high-efficiency harmless treatment composition for decontamination wastewater according to any one of claims 1 to 6, wherein: the composition further comprises: the load adopts active carbon, and the mass ratio of the main reactant to the auxiliary reactant to the load is 1:0.05-0.15: 2.
8. The high-efficiency harmless treatment composition for decontamination wastewater according to claim 7, which comprises: the load adopts active carbon and graphite powder, and the dosage ratio of the active carbon to the graphite powder is 1: 1.
9. A method for using the decontamination wastewater high efficiency innocent treatment composition according to any one of claims 1 to 8, wherein: the use method comprises the following steps of: taking the composition, and mixing the composition with the solution to be treated according to the volume ratio of the solution to be treated to the composition of 5: 1.5-3.
10. The use method of the decontamination wastewater high efficiency innocent treatment composition according to claim 9, wherein: the volume ratio of the solution to be treated to the composition is 5: 1.92-1.95.
Background art:
at present, in the field of public safety, in order to meet the public safety requirements, the decontamination agent is widely and generally applied, wherein the use of bleaching powder (also called bleaching powder) is mainly used, and in the common decontamination agent types, the bleaching powder is generally used because of high effect taking speed and good specific decontamination effect, and even in some special fields, such as radioactive substances are leaked in large batches, the decontamination agent can be used as a targeted disinfectant. After the bleaching powder is widely used as a decontamination agent, the main application carrier of the bleaching powder is sodium hypochlorite or calcium hypochlorite, and the effective component of the bleaching powder is hypochlorous acid obtained by hydrolyzing the sodium hypochlorite or the calcium hypochlorite in the using process, so a large amount of substances which cannot be naturally degraded exist in the decontamination wastewater of the bleaching powder, and part of residual hypochlorous acid has strong oxidizing property and needs to be further treated at a later stage.
Therefore, there is a need in the art for an efficient harmless treatment composition for decontamination wastewater and a method of using the same.
In view of this, the present application is presented.
The invention content is as follows:
the application aims to provide a composition for neutralizing bleaching powder decontamination wastewater and a using method thereof, so as to solve at least one technical problem in the prior art.
Specifically, in a first aspect of the application, a high-efficiency harmless treatment composition for decontamination wastewater is provided, wherein the composition comprises the following components in parts by weight: main reactant, auxiliary reactant and solventThe main reactant adopts Na2SO3The auxiliary reactant adopts CH3COOH、K2C2O4·H2O、(NH4)2Fe(SO4)2·6H2O、NaHSO3The solvent is deionized water, and the mass ratio of the main reactant to the auxiliary reactant to the solvent is 1:0.05-0.1: 5-7.5.
By adopting the scheme, the reaction can be rapidly carried out, the content of the residual available chlorine in the solution is reduced, and the reacted solution is neutral.
Preferably, the co-reactant is CH3COOH。
Further, said Na2SO3、CH3The mass ratio of COOH to deionized water is 1:0.05: 5-7.5.
Preferably, the auxiliary reactant adopts NaHSO3。
Further, said Na2SO3、NaHSO3And the mass ratio of the deionized water is 1:0.06: 5.
Further, the auxiliary reactant adopts K2C2O4·H2O and (NH)4)2Fe(SO4)2·6H2O, the Na2SO3、 K2C2O4·H2O、(NH4)2Fe(SO4)2·6H2The mass ratio of O to deionized water is 1:0.02:0.08: 5.
By adopting the scheme, the reaction process is mild, a large amount of white precipitates are generated in the reaction process, no gas is discharged, and no peculiar smell exists.
Preferably, the composition further comprises: the load adopts active carbon, and the mass ratio of the main reactant to the auxiliary reactant to the load is 1:0.05-0.15: 2.
Furthermore, the load adopts active carbon and graphite powder.
By adopting the scheme, the chlorite can be promoted to react and decompose into chloride ions, the main reactant and the auxiliary reactant are effectively assisted and catalyzed to react with the residual effective chlorine in the solution, and the reaction is promoted.
Specifically, according to a second aspect of the application, a method for using the decontamination wastewater high-efficiency harmless treatment composition comprises the following components by volume:
taking the composition, and mixing the composition with the solution to be treated according to the volume ratio of the solution to be treated to the composition of 5: 1.5-3.
By adopting the scheme, the dosage of the composition can be controlled while the content of the residual effective chlorine in the solution is ensured to be reduced, so that the purification process is carried out efficiently.
Preferably, the volume ratio of the solution to be treated to the composition in the use method of the high-efficiency harmless treatment composition for the decontamination wastewater is 5: 1.92-1.95.
By adopting the scheme, the rapid reaction can be ensured.
In summary, the application can rapidly react, reduce the content of the residual available chlorine in the solution, make the solution after the reaction neutral, promote the reaction of chlorite to decompose into chloride ions, effectively assist and catalyze the reaction of the main reactant and the auxiliary reactant with the residual available chlorine in the solution, and promote the reaction.
The specific implementation mode is as follows:
exemplary embodiments will be described in detail herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.
The present application will be described in detail below by way of examples.
Examples of the experiments
Scheme 1
And measuring the content of available chlorine in the bleaching powder fine treatment wastewater by adopting an iodometry titration method.
The content of the available chlorine represents the amount of the effective components contained in the oxidizing and chlorinating agent, and means that the oxidizing and chlorinating agent is equivalently converted into chlorine gas, the amount of the chlorine gas is the available chlorine and can be represented by mass, concentration or percentage, and the amount is represented by percentage below.
In the process of measuring available chlorine by an iodometry, the effective component Ca (ClO) in the bleaching powder is added in the presence of excessive KI2KI can be oxidized into I2The available chlorine of the bleaching powder can be measured, and the reaction formula is as follows:
ClO-+2I-+2H+→I2+Cl-+H2O；
I2+2S2O3 2-→2I-+S4O6 2-；
the formula for calculating available chlorine can be obtained from the above reaction formula.
Second, Na in the reaction2S2O3The concentration of the solution can be calibrated by a reference potassium dichromate, and the determination principle reaction formula is as follows:
Cr2O7 2-+6I-+14H+→7H2O+3I2+2Cr3+；
I2+2S2O3 2-→2I-+S4O6 2-。
scheme 2
Test for determination of the dissolution of the bleaching powder.
3.5162g of solid bleaching powder is weighed to prepare 500mL of suspension;
standing to obtain 25mL of supernatant, adding 20mL of 10% KI solution and 0.5mol/L H2SO410mL of the solution;
standing in dark for 5min, and adding calibrated Na2S2O3The solution was titrated to light yellow, then 1mL of 0.5% starch solution was added, the solution turned blue, and then titrated to colorless.
TABLE 1 determination of available chlorine content in solid bleaching powder by iodometry
The available chlorine was calculated from the experimental data as follows:
wherein 0.0355 is in contact with 1mL of 1mol/L Na2S2O3The titration solution corresponds to the available chlorine mass in grams.
Scheme 3
In the test for measuring the available chlorine of the bleaching powder solution, the mass ratio of the solid bleaching powder to the deionized water is 1: 8.
3.0086g of bleaching powder solid is weighed, and 24mL of deionized water is added to prepare suspension;
standing, taking 1.30mL of supernatant, and weighing 1.3066g of average weight for three times;
20mL of 10% KI solution and 0.5mol/L H were added2SO410mL of the solution;
standing in dark for 5min, and adding calibrated Na2S2O3Titrating the solution to light yellow, adding 1mL of 0.5% starch solution, changing the solution to blue, and titrating to colorless;
the available chlorine was calculated from the experimental data as follows:
wherein 0.0355 is in contact with 1mL of 1mol/L Na2S2O3The titration solution corresponds to the available chlorine mass in grams.
Scheme 4
In the test for measuring the available chlorine of the bleaching powder solution, the mass ratio of the solid bleaching powder to the deionized water is 1: 12.
3.0012g of bleaching powder solid is weighed, and 36mL of deionized water is added to prepare suspension;
standing, taking 1.30mL of supernatant, and weighing 1.3066g of average weight for three times;
20mL of 10% KI solution and 0.5mol/L H were added2SO410mL of the solution;
standing in dark for 5min, and adding calibrated Na2S2O3Titrating the solution to light yellow, adding 1mL of 0.5% starch solution, changing the solution to blue, and titrating to colorless;
the available chlorine was calculated from the experimental data as follows:
wherein 0.0355 is in contact with 1mL of 1mol/L Na2S2O3The titration solution corresponds to the available chlorine mass in grams.
Scheme 5
In the test for measuring the available chlorine of the bleaching powder solution, the mass ratio of the solid bleaching powder to the deionized water is 1: 16.
Weighing 3.0000g of bleaching powder solid, and adding 48mL of deionized water to prepare suspension;
standing, taking 1.30mL of supernatant, and weighing 1.3066g of average weight for three times;
20mL of 10% KI solution and 0.5mol/L H were added2SO410mL of the solution;
standing in dark for 5min, and adding calibrated Na2S2O3Titrating the solution to light yellow, adding 1mL of 0.5% starch solution, changing the solution to blue, and titrating to colorless;
the available chlorine was calculated from the experimental data as follows:
wherein 0.0355 is in contact with 1mL of 1mol/L Na2S2O3The titration solution corresponds to the available chlorine mass in grams.
Scheme 6
In the test for measuring the available chlorine of the bleaching powder solution, the mass ratio of the solid bleaching powder to the deionized water is 1: 4.
6.0019g of bleaching powder solid is weighed, and 24mL of deionized water is added to prepare suspension;
standing, taking 1.30mL of supernatant, and weighing 1.3066g of average weight for three times;
20mL of 10% KI solution and 0.5mol/L H were added2SO410mL of the solution;
standing in dark for 5min, and adding calibrated Na2S2O3Titrating the solution to light yellow, adding 1mL of 0.5% starch solution, changing the solution to blue, and titrating to colorless;
the available chlorine was calculated from the experimental data as follows:
wherein 0.0355 is in contact with 1mL of 1mol/L Na2S2O3The titration solution corresponds to the available chlorine mass in grams.
Scheme 3-scheme 6 the results of the tests and calculations are shown in the following table.
TABLE 2 iodine titration determination of available chlorine content in bleaching powder solution with different modulation ratios
Note: in the blank experiment, the ratio of AC% to 0 and the effective chlorine unit is converted into 1000mg/L to 1%.
Scheme 7
And measuring the content of the available chlorine in the bleaching powder fine treatment wastewater by adopting an instrument rapid determination method.
The instrument adopts a clear-time portable T-CL501C quick determination instrument for available chlorine, the supernatant obtained by the scheme 3 to the scheme 6 and the available chlorine content of the solution with 4 modulation ratios are determined by the determination instrument, and the determination results are as follows in parallel 3 times.
TABLE 3 quick determination result of available chlorine content in bleaching powder solutions with different modulation ratios by instrument
Modulation ratio
Results 1%
Results 2/%)
Results 3/%)
Mean/%
①
1:8
6.18
6.12
6.15
6.15
②
1:12
4.08
4.08
4.08
4.08
③
1:16
2.89
2.90
2.91
2.90
④
1:4
6.41
6.43
6.41
6.42
Note: and converting the effective chlorine unit into 1000 mg/L-1%.
As can be seen from tables 2 and 3, the above comparative analysis shows that the instrumental rapid assay method has less deviation in the detection result of the same sample compared to the iodometry method, but the instrumental rapid assay method is convenient, rapid and less in operation, thereby reducing errors caused by human factors, and therefore the instrumental rapid assay method is selected as the main method for detecting the effective chlorine content of the sample.
Scheme 8
And (3) preparing and inspecting a bleaching powder (1:8) solution.
10.0023g of the blanc powder solid is weighed, 80mL of deionized water is added, the pH value of the solution and available chlorine are measured, and three groups are measured. The test results are shown in the following table:
TABLE 4 determination of the pH and available chlorine content of the bleaching powder (1:8) solution
Example 1
Preparation of the composition, mixing Na2SO3、CH3Mixing COOH and deionized water at a mass ratio of 2:0.10:10, and mixingDissolving to obtain the composition. Taking the bleaching powder (1:8) solution prepared in the scheme 8, mixing the bleaching powder (1:8) solution with the composition according to the volume ratio of 5:2, recording the reaction phenomenon, centrifuging the mixture after white precipitation, no gas, no odor and heat release, and taking the supernatant to measure the pH and the available chlorine.
Example 2
Preparation of the composition, mixing Na2SO3、CH3Mixing COOH and deionized water in a mass ratio of 2:0.10:15, and fully dissolving to obtain the composition. Taking the bleaching powder (1:8) solution prepared in the scheme 8, mixing the bleaching powder (1:8) solution with the composition according to the volume ratio of 5:2.8, recording the reaction phenomenon, centrifuging the mixture after white precipitate, gas-free, tasteless and heat release is measured, and taking the supernatant to measure the pH and available chlorine.
Example 3
Preparation of the composition, mixing Na2SO3、NaHSO3And deionized water with the mass ratio of 2:0.12:10, and fully dissolving to obtain the composition. Taking the bleaching powder (1:8) solution prepared in the scheme 8, mixing the bleaching powder (1:8) solution with the composition according to the volume ratio of 5:2.17, recording the reaction phenomenon, centrifuging the mixture after white precipitate, gas-free, odorless and heat release is measured, and taking the supernatant to measure the pH and available chlorine.
Example 4
Preparation of the composition, mixing Na2SO3、NaHSO3And deionized water with the mass ratio of 2:0.12:10, and fully dissolving to obtain the composition. Taking the bleaching powder (1:8) solution prepared in the scheme 8, mixing the bleaching powder (1:8) solution with the composition according to the volume ratio of 5:2.3, recording the reaction phenomenon, centrifuging the mixture after white precipitate, gas-free, tasteless and heat release is measured, and taking the supernatant to measure the pH and available chlorine.
Example 5
Preparation of the composition, mixing Na2SO3、K2C2O4·H2And mixing O and deionized water in a mass ratio of 2:0.2:10, and fully dissolving to obtain the composition. The blanc powder (1:8) solution prepared in scheme 8 is mixed with the composition in a ratio of 5:3 by volume of the blanc powder (1:8) solution, and the reaction is recordedPhenomenon, after waiting for a white precipitate, no gas, no odor, heat release, the mixture was centrifuged and the supernatant was taken to measure its pH and available chlorine.
Example 6
Preparation of the composition, mixing Na2SO3、(NH4)2Fe(SO4)2And deionized water with the mass ratio of 2:0.18:10, and fully dissolving to obtain the composition. Taking the bleaching powder (1:8) solution prepared in the scheme 8, mixing the bleaching powder (1:8) solution with the composition according to the volume ratio of 5:1.5, recording the reaction phenomenon, centrifuging the mixture after white precipitate, gas-free, tasteless and heat release is measured, and taking the supernatant to measure the pH and available chlorine.
Example 7
Preparation of the composition, mixing Na2SO3、K2C2O4·H2O、(NH4)2Fe(SO4)2And deionized water in a mass ratio of 2:0.05:0.15:10, and fully dissolving to obtain the composition. Taking the bleaching powder (1:8) solution prepared in the scheme 8, mixing the bleaching powder (1:8) solution with the composition according to the volume ratio of 5:1.8, recording the reaction phenomenon, centrifuging the mixture after white precipitate, gas-free, tasteless and heat release is measured, and taking the supernatant to measure the pH and available chlorine.
TABLE 5 determination of pH and available chlorine content of solutions after reaction of examples 7-12
As can be seen from Table 5, the effective chlorine in the solution after the reaction can be effectively reduced by adopting the above-mentioned ratio, and the applicant believes that the effective chlorine content remained in the solution can be rapidly reduced by fully utilizing the binding characteristics of the main reactant and the auxiliary reactant by adopting the above-mentioned ratio, and when the auxiliary reactant adopts CH3COOH or NaHSO3Or K2C2O4·H2O and (NH)4)2Fe(SO4)2When the method is used, the effective chlorine reducing effect is better.
Example 8
Preparation of the composition, mixing Na2SO3、NaHSO3And the active carbon and the deionized water are mixed according to the mass ratio of 2:0.2:4:10 and fully dissolved to prepare the composition. Taking the bleaching powder (1:8) solution prepared in the scheme 8, mixing the bleaching powder (1:8) solution with the composition according to the volume ratio of 5:2, recording the reaction phenomenon, centrifuging the mixture after white precipitation, no gas, no odor and heat release, and taking the supernatant to measure the pH and the available chlorine.
Example 9
Preparation of the composition, mixing Na2SO3、NaHSO3And mixing the graphite powder and the deionized water according to the mass ratio of 2:0.2:4:10, and fully dissolving to obtain the composition. Taking the bleaching powder (1:8) solution prepared in the scheme 8, mixing the bleaching powder (1:8) solution with the composition according to the volume ratio of 5:2, recording the reaction phenomenon, centrifuging the mixture after white precipitation, no gas, no odor and heat release, and taking the supernatant to measure the pH and the available chlorine.
Example 10
Preparation of the composition, mixing Na2SO3、NaHSO3The active carbon, the graphite powder and the deionized water are mixed according to the mass ratio of 2:0.2:1:3:10, and the mixture is fully dissolved to prepare the composition. Taking the bleaching powder (1:8) solution prepared in the scheme 8, mixing the bleaching powder (1:8) solution with the composition according to the volume ratio of 5:2, recording the reaction phenomenon, centrifuging the mixture after white precipitation, no gas, no odor and heat release, and taking the supernatant to measure the pH and the available chlorine.
Example 11
Preparation of the composition, mixing Na2SO3、CH3Mixing COOH, activated carbon and deionized water according to the mass ratio of 2:0.2:4:10, and fully dissolving to obtain the composition. Mixing the bleaching powder (1:8) solution prepared in the scheme 8 with the composition according to the volume ratio of 5:2 of the bleaching powder (1:8) solution to the composition, recording the reaction phenomenon, centrifuging the mixture after white precipitate is quantified, no gas is generated, no smell is generated, and heat is released, taking supernatant liquid, and measuring the pH value and the existence of the pH valueChlorine is available.
Example 12
Preparation of the composition, mixing Na2SO3、CH3Mixing COOH, graphite powder and deionized water in a mass ratio of 2:0.2:4:10, and fully dissolving to obtain the composition. Taking the bleaching powder (1:8) solution prepared in the scheme 8, mixing the bleaching powder (1:8) solution with the composition according to the volume ratio of 5:2, recording the reaction phenomenon, centrifuging the mixture after white precipitation, no gas, no odor and heat release, and taking the supernatant to measure the pH and the available chlorine.
Example 13
Preparation of the composition, mixing Na2SO3、CH3Mixing COOH, activated carbon, graphite powder and deionized water according to the mass ratio of 2:0.2:1:3:10, and fully dissolving to obtain the composition. Taking the bleaching powder (1:8) solution prepared in the scheme 8, mixing the bleaching powder (1:8) solution with the composition according to the volume ratio of 5:2, recording the reaction phenomenon, centrifuging the mixture after white precipitation, no gas, no odor and heat release, and taking the supernatant to measure the pH and the available chlorine.
TABLE 6 determination of pH and available chlorine content of solutions after reaction of examples 7-12
Group of
pH
AC(mg/L)
Example 8
7.89
546
Example 9
7.96
593
Example 10
8.01
364
Example 11
7.93
514
Example 12
7.91
557
Example 13
8.00
329
As can be seen from Table 6, the effective chlorine in the solution after the reaction can be effectively reduced by adopting the above-mentioned ratio, and the applicant believes that the effective chlorine content remained in the solution can be rapidly reduced by fully utilizing the binding characteristics of the main reactant and the auxiliary reactant by adopting the above-mentioned ratio, and when the auxiliary reactant adopts CH3COOH, NaHSO3, and active carbon and graphite powder as load, which has excellent effective chlorine reducing effect and makes the treated solution neutral.
It should be noted that, for those skilled in the art, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall into the protection scope of the claims of the present application.
