Wastewater degradation agent and use method thereof

Abstract

The present invention relates to the technical field of environmental protection and water treatment, and discloses a wastewater degradation agent, which comprises a basic component and an auxiliary component, the basic component comprises an oxidizing agent, a catalyst and a stabilizer, the auxiliary component comprises a chelating agent, a surfactant and a synergist, the mass fraction accounts for 30%-40% of the total medicament; the catalyst is an iron-based compound, and the mass fraction of the catalyst accounts for 10%-20% of the total medicament; the stabilizer is a phosphate compound, and the mass fraction of the stabilizer accounts for 5%-10% of the total medicament; the chelating agent is ethylenediaminetetraacetic acid, and the mass fraction of the chelating agent accounts for 5%-15% of the total agent. Through scientific component proportioning, the oxidant, the catalyst and the stabilizer in the basic components form a synergistic effect, strong oxidizing free radicals generated by decomposition of the oxidant can quickly attack molecular chains of organic matters, the catalyst remarkably improves the generation rate of the free radicals, and the stabilizer ensures that the agent continuously plays a role.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of environmental protection and water treatment, in particular to a wastewater degradation agent and its use method. BACKGROUND

[0002] Sewage treatment refers to a series of engineering activities aimed at controlling and reducing water pollution to improve water quality, protect the ecological environment, and achieve sustainable utilization of water resources. Sewage treatment technology covers industrial wastewater treatment, domestic sewage treatment, agricultural drainage treatment, and purification treatment of special wastewater (such as medical wastewater, oily wastewater, etc.). With the rapid development of industrialization and urbanization, the discharge of various types of wastewater has been increasing year by year, which contains a large amount of organic matter, heavy metal ions, nitrogen and phosphorus compounds, and other difficult-to-degrade pollutants. If these pollutants are not effectively treated before being discharged, they will not only destroy the ecological balance of water bodies, but also pose a threat to human health.

[0003] Currently, chemical agents are widely used as an auxiliary means in wastewater treatment to improve treatment efficiency. However, existing wastewater degradation agents have many problems in actual application. For example, the degradation efficiency of some agents is low, especially when facing wastewater with complex components, which cannot meet the increasingly stringent discharge standards. In addition, the existing agents have a narrow application range, and can usually only act on a certain type of pollutants, while the effect on multi-component mixed wastewater is limited. At the same time, some agents may cause secondary pollution problems during use, such as introducing new harmful substances or generating difficult-to-treat byproducts, thereby further increasing the difficulty of subsequent treatment. In addition, the use method of existing agents is often complex, requiring precise control of dosage, reaction conditions, and operation steps, which requires high equipment requirements and increases the operating cost and management difficulty.

[0004] Although some research has tried to solve the above problems by optimizing the formulation of the agent or improving the process, the actual effect still has certain limitations. For example, although some agents have improved degradation efficiency, their high cost limits large-scale promotion; while some agents have a wide application range, but the effect is not ideal when treating high-concentration pollutants. In addition, there is little research on the synergistic effect of the components of the agent in the existing technology, which leads to the overall performance of the agent not being fully utilized. SUMMARY

[0005] (I) Technical problems solved In view of the deficiencies of the prior art, the present application provides a wastewater degradation agent and its use method, which solves the problem of "low working efficiency" in the above background art.

[0006] (II) Technical solutions

[0007] In order to achieve the above object, the present application is implemented by the following technical scheme: a wastewater degradation agent, comprising a basic component and an auxiliary component, the basic component is composed of an oxidizing agent, a catalyst and a stabilizer, the auxiliary component is composed of a chelating agent, a surfactant and a synergist, wherein: The oxidizing agent is persulfate, and the mass fraction is 30%-40% of the total agent. The catalyst is an iron-based compound, and the mass fraction is 10%-20% of the total agent. The stabilizer is a phosphate compound, and the mass fraction is 5%-10% of the total agent. The chelating agent is ethylenediaminetetraacetic acid, and the mass fraction is 5%-15% of the total agent. The surfactant is a non-ionic polyoxyethylene ether compound, and the mass fraction is 3%-8% of the total agent. The synergist is a silicate compound, and the mass fraction is 2%-5% of the total agent.

[0008] Preferably, the iron-based compound is ferrous sulfate or ferrous chloride.

[0009] Preferably, the agent is prepared by physical mixing, and the particles are refined to micron level during the mixing process.

[0010] Preferably, a method for using the wastewater degradation agent comprises the following steps: S1: determining the agent dosage according to the types and concentrations of pollutants in the wastewater, for high-concentration organic wastewater, the agent dosage is 0.5%-1% of the wastewater volume, and for low-concentration wastewater, the agent dosage is 0.1%-0.3% of the wastewater volume; S2: controlling the reaction temperature in the range of 20-40 DEG C, the reaction time is 30 minutes to 2 hours, and the wastewater is stirred, and the stirring speed is controlled at 100-200 rpm; S3: for wastewater containing heavy metal ions, the proportion of chelating agent is increased and the reaction time is prolonged to more than 2 hours; for oil-containing wastewater, the proportion of surfactant is increased and the floating oil is removed by an oil separation tank before reaction; for high-salinity wastewater, the proportion of stabilizer is increased; S4: detecting the treated wastewater, and the detection indexes include chemical oxygen demand, biochemical oxygen demand and heavy metal ion concentration.

[0011] Preferably, the agent dosage method includes direct addition and addition after dilution, direct addition is suitable for small wastewater treatment system, and addition after dilution is suitable for large wastewater treatment system.

[0012] Preferably, if the detection result does not reach the discharge standard, the agent is repeatedly added and the reaction time is prolonged.

[0013] Preferably, the medicament is in powder form for storage and transportation.

[0014] Preferably, the medicament is dissolved in water to form a uniform solution when used.

[0015] Preferably, the stirring speed is preferably 150 rpm, the reaction temperature is preferably 30°C, and the chemical oxygen demand and biochemical oxygen demand in the detection index correspond to the evaluation standard of wastewater degradation effect, respectively.

[0016] (Three) beneficial effects

[0017] The present application provides a wastewater degradation medicament and its use method. It has the following beneficial effects: (1) The present application forms a synergistic effect among the oxidizing agent, catalyst and stabilizer in the basic component through scientific component proportioning. The strong oxidizing free radicals generated by the decomposition of the oxidizing agent can quickly attack the molecular chain of organic matter. The catalyst significantly improves the generation rate of free radicals, and the stabilizer ensures the continuous effect of the medicament. At the same time, the auxiliary component further enhances the reaction activity. After granulation refinement treatment, the solubility and reaction activity are greatly improved, effectively solving the problems of low degradation efficiency of existing medicaments and poor performance in the face of complex component wastewater. Even for complex wastewater containing multiple pollutants, it can efficiently reduce the concentration of COD, BOD and heavy metal ions and other indicators.

[0018] (2) The present application can flexibly adjust the proportion of each component of the medicament according to the type of wastewater. For wastewater containing heavy metal ions, increasing the proportion of chelating agent and prolonging the reaction time can ensure complete complexation of heavy metal ions. For oil-containing wastewater, increasing the proportion of surfactant and cooperating with pretreatment can improve the degradation efficiency. For high salinity wastewater, increasing the proportion of stabilizer can prevent the medicament from failing. This flexible adjustment mechanism breaks through the limitations of existing medicaments with narrow application range and only targeting specific pollutants, and can be widely applied to the treatment of industrial wastewater, domestic sewage, special wastewater and other types of wastewater.

[0019] (3) The components of the medicament of the present application are safe and environmentally friendly. During use, no new harmful substances are introduced, and no by-products that are difficult to handle are generated, effectively avoiding the risk of secondary pollution. At the same time, its preparation process is physical mixing, and the use method is simple, divided into direct addition and addition after dilution, without complex operation steps and expensive equipment support, reducing the requirements for equipment, thereby reducing the operating cost and management difficulty of wastewater treatment, solving the problems of existing medicaments that are prone to secondary pollution and complex use methods leading to high cost BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The present application provides a wastewater degradation medicament and its use method. It has the following beneficial effects:

[0021] In the diagram: 1. Basic ingredients; 2. Auxiliary ingredients; 3. Oxidizing agents; 4. Catalysts; 5. Stabilizers; 6. Chelating agents; 7. Surfactants; 8. Synergists. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0023] Please see Figure 1 This invention provides a wastewater degradation agent, comprising basic and auxiliary components. The basic component 1 consists of an oxidant 3, a catalyst 4, and a stabilizer 5, which are mixed in specific proportions to ensure synergistic effects. The oxidant 3 is a persulfate, with a mass fraction of 30%–40% of the total agent. The catalyst 4 is an iron-based compound such as ferrous sulfate or ferrous chloride, with a mass fraction of 10%–20%. The stabilizer 5 is a phosphate compound, with a mass fraction of 5%–10%. The auxiliary component 2 includes a chelating agent 6, a surfactant 7, and a synergist 8. The chelating agent 6 is ethylenediaminetetraacetic acid (EDTA), with a mass fraction of 5%–15%. The surfactant 7 is a nonionic polyoxyethylene ether compound, with a mass fraction of 3%–8%. The synergist 8 is a silicate compound, with a mass fraction of 2%–5%. The components are physically mixed, and the mixing process refines the particles to the micron level to improve solubility and reactivity.

[0024] In the specific preparation process, oxidant 3 and catalyst 4 are first weighed and initially mixed according to the specified ratio. Then, stabilizer 5 is added for secondary mixing. During this step, the stirring speed must be controlled to ensure uniform particle distribution and prevent agglomeration. Next, chelating agent 6, surfactant 7, and synergist 8 are added to the mixture sequentially. Each component must be thoroughly stirred to achieve uniform dispersion. The resulting powdered drug exhibits good storage stability and dissolves rapidly in water to form a homogeneous solution upon use.

[0025] Based on the above, this invention also provides a method for using a wastewater degradation agent. The specific operating steps are as follows: First, determine the dosage of the agent based on the type and concentration of pollutants in the wastewater. For high-concentration organic wastewater, the dosage is 0.5% to 1% of the wastewater volume, while for low-concentration wastewater, the dosage can be reduced to 0.1% to 0.3%. There are two addition methods: direct addition and addition after dilution. Direct addition is suitable for small-scale wastewater treatment systems; simply sprinkle the agent evenly into the wastewater. Addition after dilution is suitable for large-scale wastewater treatment systems; first, dissolve the agent in an appropriate amount of water to form a solution, and then use a pump to evenly add the solution to the wastewater. Second, control the reaction conditions to optimize the degradation effect. The reaction temperature should be maintained within the range of 20℃-40℃. Temperatures that are too high or too low will affect the agent's activity. The reaction time is usually set to 30 minutes to 2 hours, with the specific time adjusted according to the degree of wastewater pollution. During the reaction, the wastewater needs to be stirred, and the stirring speed should be controlled at 100-200 rpm to avoid the sedimentation of the reagent particles due to excessive stirring.

[0026] For different types of wastewater, the usage parameters of the reagents need to be adjusted appropriately. For wastewater containing heavy metal ions, the proportion of chelating agent 6 needs to be increased, and the reaction time extended to more than 2 hours to ensure that the heavy metal ions are completely complexed. For oily wastewater, the proportion of surfactant 7 needs to be increased, and the wastewater should be pretreated before the reaction, such as by removing floating oil through an oil separator, to improve the degradation efficiency of the reagents. For high-salinity wastewater, the proportion of stabilizer 5 needs to be increased to prevent the reagents from becoming ineffective due to the high-salinity environment. Finally, the treated wastewater is tested to evaluate the degradation effect of the reagents. The test indicators include chemical oxygen demand (COD), biochemical oxygen demand (BOD), and heavy metal ion concentration. If the test results do not meet the discharge standards, the reagents need to be added again and the reaction time extended.

[0027] In practical applications, taking the treatment of high-concentration organic wastewater from a chemical plant as an example, this wastewater contains a large amount of benzene compounds and a small amount of heavy metal ions. First, the wastewater is introduced into a reaction tank. The required dosage of the reagent is calculated based on the wastewater volume. Assuming the wastewater volume is 100 cubic meters, the reagent dosage is 0.8% of the wastewater volume, i.e., 800 kg. The reagent is dissolved in 10 cubic meters of water to form a solution, which is then uniformly added to the wastewater using a pump. A stirring device is installed in the reaction tank, with a stirring speed set at 150 rpm. The reaction temperature is controlled at 30℃, and the reaction time is set at 1.5 hours. After the reaction, samples are taken for testing. The results show that COD decreased from the initial 800 mg / L to 50 mg / L, BOD decreased from the initial 300 mg / L to 10 mg / L, and the concentration of heavy metal ions also decreased significantly, meeting national emission standards.

[0028] Further analysis of the mechanisms of action of each component in the reagent revealed that oxidant 3 decomposes in aqueous solution to generate highly oxidizing free radicals. These free radicals rapidly attack the molecular chains of organic matter in wastewater, breaking them down into smaller molecules until they are completely mineralized into carbon dioxide and water. The presence of catalyst 4 significantly increases the rate of free radical generation, thereby accelerating the degradation process of organic matter. Stabilizer 5 ensures the reagent's continued effectiveness during the reaction by slowing down its decomposition rate, preventing premature degradation efficiency loss. Chelating agent 6 forms stable complexes with heavy metal ions in wastewater, reducing the inhibitory effect of heavy metal ions on the oxidation reaction and preventing secondary pollution caused by the re-release of heavy metal ions into the environment. Surfactant 7 enhances the contact area between the reagent and pollutants by reducing the surface tension of wastewater, thereby improving degradation efficiency. Synergist 8 enhances the dispersibility and stability of the reagent, enabling it to maintain high performance even in complex wastewater environments.

[0029] In an industrial wastewater treatment scenario, a plating plant's wastewater containing heavy metal ions required advanced treatment. First, the wastewater underwent pretreatment by adjusting the pH and removing some suspended solids through sedimentation. Then, the wastewater was introduced into a reaction tank. The required dosage of the reagent was calculated based on the wastewater volume; assuming a volume of 50 cubic meters, the reagent dosage was 1% of the wastewater volume, or 500 kg. Due to the high concentration of heavy metal ions in the wastewater, the proportion of chelating agent 6 was appropriately increased to 15% of the total reagent, and the reaction time was extended to 2.5 hours. During the reaction, the stirring speed was maintained at 120 rpm, and the reaction temperature was controlled at 25°C. After the reaction, samples were taken for testing, and the results showed a significant reduction in heavy metal ion concentration, meeting national emission standards. This example demonstrates that the wastewater degradation reagent of this invention exhibits excellent performance in treating wastewater containing heavy metal ions.

[0030] In a domestic wastewater treatment scenario, a city's wastewater treatment plant needs to treat domestic wastewater containing grease and suspended solids. First, the wastewater is introduced into a reaction tank. The required dosage of chemicals is calculated based on the wastewater volume. Assuming the wastewater volume is 200 cubic meters, the dosage of chemicals is 0.3% of the wastewater volume, or 600 kg. Since the wastewater contains a certain amount of grease, the proportion of surfactant 7 needs to be appropriately increased to 8% of the total chemicals, and floating oil is removed through an oil separator before the reaction. During the reaction, the stirring speed is maintained at 180 rpm, the reaction temperature is controlled at 35°C, and the reaction time is set to 1 hour. After the reaction, samples are taken for testing. The results show that COD and BOD are significantly reduced, meeting national emission standards. This example demonstrates that the wastewater degradation agent of this invention also exhibits highly efficient degradation capabilities when treating oily wastewater.

[0031] The wastewater degradation agent of this invention achieves efficient treatment of various wastewaters through a scientifically proportioned formula and a rigorous operating procedure. It has a wide range of applications and can handle different types of wastewater, including industrial wastewater, domestic sewage, and special wastewater. The agent does not introduce new harmful substances or generate difficult-to-treat byproducts during use, thus effectively reducing the risk of secondary pollution. Furthermore, the agent is simple to use, requiring no complex operating procedures or expensive equipment, thereby reducing the cost and management difficulty of wastewater treatment.

[0032] Furthermore, the specific implementation principle of the present invention will be further explained below with reference to a specific application scenario.

[0033] In a high-concentration organic wastewater treatment scenario at a chemical plant, the wastewater to be treated is first introduced into the reaction tank, and the required dosage of chemicals is calculated based on the wastewater volume. Assuming the wastewater volume is 100 cubic meters, the chemical dosage is 0.8% of the wastewater volume, which translates to 800 kg of chemical. Furthermore, the chemical is added after dilution; it is first dissolved in 10 cubic meters of water to form a homogeneous solution, which is then pumped evenly into the wastewater. This process ensures sufficient contact between the chemical and the wastewater, thus laying the foundation for the subsequent reaction.

[0034] A stirring device is installed in the reaction tank, with a stirring speed set at 150 rpm to ensure uniform distribution of the reagent particles in the wastewater and prevent sedimentation. The reaction temperature is controlled at 30℃, which effectively activates the persulfate in oxidant 3, causing it to decompose and generate highly oxidizing free radicals. These free radicals rapidly attack the organic molecular chains in the wastewater, breaking them down into smaller molecules until they are completely mineralized into carbon dioxide and water. The presence of catalyst 4 significantly increases the rate of free radical generation, thereby accelerating the degradation process of organic matter. Stabilizer 5 slows down the decomposition rate of the reagent, ensuring its continued effectiveness during the reaction and preventing a decrease in degradation efficiency due to premature reagent failure.

[0035] Chelating agent 6 plays a crucial role in addressing the trace amounts of heavy metal ions present in the wastewater. Furthermore, chelating agent 6 forms stable complexes with heavy metal ions, reducing their inhibitory effect on the oxidation reaction and preventing secondary pollution caused by the re-release of heavy metal ions into the environment. Surfactant 7 enhances the contact area between the agent and pollutants by reducing the surface tension of the wastewater, thereby further improving degradation efficiency. Synergist 8 enhances the dispersibility and stability of the agent, ensuring its high performance even in complex wastewater environments.

[0036] The reaction time was set at 1.5 hours, during which the reagent fully reacted with the pollutants in the wastewater. After the reaction, samples were taken for testing. The results showed that the chemical oxygen demand (COD) decreased from the initial 800 mg / L to 50 mg / L, the biochemical oxygen demand (BOD) decreased from the initial 300 mg / L to 10 mg / L, and the concentration of heavy metal ions also decreased significantly, meeting national emission standards. This result directly reflects the reagent's highly efficient degradation ability for pollutants.

[0037] In another industrial wastewater treatment scenario, a plating plant was generating wastewater containing heavy metal ions that required advanced treatment. First, the wastewater underwent pretreatment by adjusting the pH and removing some suspended solids through sedimentation. Then, the wastewater was introduced into a reaction tank. The required dosage of chemicals was calculated based on the wastewater volume; assuming a volume of 50 cubic meters, the dosage was 1% of the wastewater volume, or 500 kg. Due to the high concentration of heavy metal ions in the wastewater, the proportion of chelating agent 6 was appropriately increased to 15% of the total reagents, and the reaction time was extended to 2.5 hours. This adjustment ensured that the heavy metal ions were completely chelated, preventing them from interfering with subsequent treatment processes.

[0038] During the reaction, the stirring speed was maintained at 120 rpm, and the reaction temperature was controlled at 25°C. Under these conditions, the free radicals generated by the decomposition of oxidant 3 reacted with the organic matter in the wastewater, while chelating agent 6 formed stable complexes with heavy metal ions. After the reaction, samples were taken for testing, and the results showed that the concentration of heavy metal ions was significantly reduced, meeting national emission standards. This example demonstrates that the wastewater degradation agent of the present invention exhibits excellent performance in treating wastewater containing heavy metal ions.

[0039] In a domestic wastewater treatment scenario, a city's wastewater treatment plant needs to treat domestic wastewater containing grease and suspended solids. First, the wastewater is introduced into a reaction tank. The required dosage of chemicals is calculated based on the wastewater volume. Assuming the wastewater volume is 200 cubic meters, the dosage of chemicals is 0.3% of the wastewater volume, or 600 kg. Since the wastewater contains a certain amount of grease, the proportion of surfactant 7 is appropriately increased to 8% of the total chemicals, and the floating oil is removed in an oil separator before the reaction. This pretreatment step effectively reduces the impact of grease on the degradation efficiency of the chemicals.

[0040] During the reaction, the stirring speed was maintained at 180 rpm, the reaction temperature was controlled at 35°C, and the reaction time was set to 1 hour. Under these conditions, the free radicals generated by the decomposition of oxidant 3 efficiently degraded organic matter in the wastewater, while surfactant 7 increased the contact area between the agent and pollutants by reducing the surface tension of the wastewater. After the reaction, samples were taken for testing, and the results showed a significant reduction in COD and BOD, meeting national emission standards. This indicates that the wastewater degradation agent of the present invention also exhibits highly efficient degradation capabilities when treating oily wastewater.

[0041] In summary, the wastewater degradation agent of this invention achieves efficient treatment of various wastewaters through a scientifically proportioned formula and a rigorous operating procedure. The synergistic effect between the components ensures the agent's wide applicability in different wastewater environments, while simplifying the operation process and reducing wastewater treatment costs and management complexity.

[0042] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A wastewater degradation agent, characterized in that, It includes a base component (1) and an auxiliary component (2), wherein the base component (1) consists of an oxidant (3), a catalyst (4), and a stabilizer (5), and the auxiliary component (2) consists of a chelating agent (6), a surfactant (7), and a synergist (8), wherein: The oxidant (3) is persulfate, accounting for 30% to 40% of the total reagent by mass. The catalyst (4) is an iron-based compound, accounting for 10% to 20% of the total reagent by mass. The stabilizer (5) is a phosphate compound, accounting for 5% to 10% of the total reagent by mass. The chelating agent (6) is ethylenediaminetetraacetic acid, with a mass fraction of 5% to 15% of the total reagent; The surfactant (7) is a nonionic polyoxyethylene ether compound, accounting for 3% to 8% of the total reagent by mass. The synergist (8) is a silicate compound, and its mass fraction accounts for 2% to 5% of the total reagent.

2. The wastewater degradation agent according to claim 1, characterized in that: The iron-based compound is ferrous sulfate or ferrous chloride.

3. The wastewater degradation agent according to claim 1, characterized in that: The agent is prepared by physical mixing, during which the particles are refined to the micron level.

4. A method of using the wastewater degradation agent as described in any one of claims 1-3, characterized in that: Includes the following steps: S1: Determine the dosage of the reagent based on the type and concentration of pollutants in the wastewater. For high-concentration organic wastewater, the dosage is 0.5% to 1% of the wastewater volume; for low-concentration wastewater, the dosage is 0.1% to 0.3% of the wastewater volume. S2: Control the reaction temperature within the range of 20℃-40℃, the reaction time is 30 minutes to 2 hours, and stir the wastewater at a speed of 100-200 rpm. S3: For wastewater containing heavy metal ions, increase the proportion of chelating agent (6) and extend the reaction time to more than 2 hours; for oily wastewater, increase the proportion of surfactant (7) and remove floating oil through an oil separator before the reaction; for high salinity wastewater, increase the proportion of stabilizer (5). S4: Test the treated wastewater, including chemical oxygen demand (COD), biochemical oxygen demand (BOD), and heavy metal ion concentration.

5. The method of using a wastewater degradation agent according to claim 4, characterized in that: The agent can be added by direct addition or by dilution. Direct addition is suitable for small wastewater treatment systems, while dilution is suitable for large wastewater treatment systems.

6. The method of using a wastewater degradation agent according to claim 4, characterized in that: If the test results do not meet the emission standards, the reagent should be added again and the reaction time extended.

7. The method of using a wastewater degradation agent according to claim 1, characterized in that: The medicine is in powder form and is used for storage and transportation.

8. The method of using a wastewater degradation agent according to claim 1, characterized in that: The agent dissolves in water to form a homogeneous solution during use.

9. The method of using a wastewater degradation agent according to claim 4, characterized in that: The preferred stirring speed is 150 rpm, the preferred reaction temperature is 30°C, and the chemical oxygen demand (COD) and biochemical oxygen demand (BOD) among the detection indicators correspond to the evaluation standards for wastewater degradation effect.

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