Efficient and environment-friendly COD (Chemical Oxygen Demand) remover and preparation method thereof

Abstract

The invention provides an efficient and environment-friendly COD (Chemical Oxygen Demand) remover and a preparation method thereof, and the remover is mainly prepared from the following raw materials in parts by mass: 10-27 parts of an oxidant, 30-50 parts of a coagulant, 40-60 parts of an adsorbent, 10-20 parts of a catalyst, 30-40 parts of a stabilizer and 3-8 parts of an inhibitor. The COD remover can quickly and effectively reduce the COD value in wastewater and reduce the negative influence on the environment at the same time.

Description

Technical Field

[0001] The invention belongs to the technical field of sewage treatment, and in particular to a highly efficient and environmentally friendly COD remover and a preparation method thereof. Background Art

[0002] In recent years, with the accelerated advancement of industrialization and the continuous improvement of urbanization, wastewater discharge has shown a sharp growth trend, exacerbating the severity of COD pollution. COD (chemical oxygen demand) is an important indicator for assessing the degree of organic pollution in water bodies. It directly reflects the total amount of oxidized and reduced substances in water bodies by strong oxidants. It is an intuitive and effective parameter for measuring water pollution. The level of COD value is directly related to the degree of organic pollution in water bodies. High COD means that the water body is more seriously polluted by organic matter, and the potential harm to the natural environment and ecosystem is also quite large.

[0003] In the industrial field, especially in some specific industries such as chemical, pharmaceutical, printing and dyeing, a large amount of high-concentration organic wastewater is generated during the production process. If the wastewater is discharged directly without proper pretreatment, it will cause irreversible pollution to the water environment. This pollution will not only cause a significant decrease in the dissolved oxygen content in the water, threatening the survival and reproduction of aquatic organisms, but also increase the energy consumption and cost of the water treatment process, posing a huge challenge to environmental protection and water resources management.

[0004] Faced with the increasingly serious COD pollution problem, traditional methods of removing COD include biological treatment and chemical precipitation. Although they can reduce the concentration of COD to a certain extent, they generally have limitations such as low treatment efficiency, high cost, and easy secondary pollution. Biological treatment methods are not effective in treating high-concentration organic wastewater and are easily affected by environmental conditions; chemical precipitation methods may introduce other chemicals and cause secondary pollution. At the same time, some common COD removers on the market now also have environmental problems during the production process or use process, as well as harmful substance residues or new polluting organisms caused by backward treatment technology.

[0005] Therefore, based on the severity of the current COD pollution problem and the limitations of traditional removal methods, it is particularly urgent and important to develop a remover that can solve the above problems.

[0006] In view of this, the present invention is proposed. Summary of the invention

[0007] The first object of the present invention is to provide an efficient and environmentally friendly COD remover, which can effectively reduce the COD value in wastewater and reduce the negative impact on the environment by rapidly oxidizing and decomposing organic matter in water.

[0008] The second purpose of the present invention is to provide a method for preparing an efficient and environmentally friendly COD remover, which is not only simple to operate and can achieve rapid preparation of products, but also reduces the generation of harmful by-products from the perspective of economy and environmental friendliness, thereby achieving a green economy.

[0009] In order to achieve the above-mentioned purpose of the present invention, the following technical solutions are particularly adopted: The invention provides an efficient and environmentally friendly COD remover, which is mainly prepared from the following raw materials by weight: 10-27 parts of oxidant, 30-50 parts of coagulant, 40-60 parts of adsorbent, 10-20 parts of catalyst, 30-40 parts of stabilizer and 3-8 parts of inhibitor.

[0010] Preferably, as a further specific implementation, the oxidant is 16-26 parts, the coagulant is 35-45 parts, the adsorbent is 45-55 parts, the catalyst is 11-16 parts, the stabilizer is 33-38 parts, and the inhibitor is 4-7 parts.

[0011] Preferably, as a further specific implementation, the oxidant is 25 parts, the coagulant is 40 parts, the adsorbent is 50 parts, the catalyst is 13 parts, the stabilizer is 36 parts, and the inhibitor is 5 parts.

[0012] Preferably, the oxidant is one or more of potassium permanganate, hydrogen peroxide, ammonium chloride and sodium chloride.

[0013] Preferably, the coagulant is one or more of polyaluminium chloride and polyacrylamide. Preferably, the adsorbent is one or more of activated carbon and sodium carbonate.

[0014] Preferably, the catalyst is at least one transition metal ion.

[0015] Preferably, the inhibitor is one or more of sodium sulfate, aluminum sulfate, magnesium sulfate and sodium silicate.

[0016] In the above-mentioned materials of the present invention, the oxidants selected are potassium permanganate, hydrogen peroxide, ammonium chloride and sodium chloride. These strong oxidants can quickly and effectively oxidize and decompose organic matter in the water body, and significantly reduce the COD value; at the same time, in order to promote the coagulation and sedimentation of colloidal particles and suspended matter in the water body, a coagulant is added, and through the mechanisms of double layer compression, adsorption and electrical neutralization, adsorption bridging, precipitation and net capture, and exchange, tiny particles are condensed into larger particles, thereby efficiently removing organic matter and purifying the water body.

[0017] The activated carbon in the adsorbent has a huge specific surface area and adsorption capacity, which can effectively adsorb organic matter, heavy metals and other impurities in the water; sodium carbonate can sometimes be used as an auxiliary adsorbent to adjust the water hardness, improve the adsorption efficiency, and significantly improve the water quality of the water body. The catalyst is a transition metal ion, such as iron ions, copper ions, etc., which can accelerate the decomposition rate of the oxidant, improve the oxidation efficiency, and thus reduce the COD content in the water body. Selecting inorganic salts or organic polymer compounds as stabilizers can effectively stabilize the water quality, prevent the generation of excessive colloidal particles during the coagulation process, and ensure the coagulation effect; at the same time, the stabilizer can also prevent the COD remover of the present invention from decomposing or precipitating during storage and use; the use of inhibitors effectively inhibits the biodegradation of organic pollutants and possible side reactions, thereby preventing further pollution of pollutants. According to the specific water quality and treatment requirements, an appropriate amount of pH regulator, surfactant, etc. can also be added as an auxiliary agent to enhance the adaptability and stability of the COD remover to ensure that the water treatment effect is optimal. Through the above-mentioned comprehensive treatment measures, organic matter in the water body can be effectively removed and the water quality is significantly improved.

[0018] That is to say, the efficient and environmentally friendly COD remover of the present invention has an excellent removal effect through the synergistic effect of the combination of carefully designed components. The oxidant effectively decomposes organic matter, and the small molecular substances produced are efficiently captured and precipitated by the coagulant; the flocs formed by the coagulant not only enhance this effect and accelerate the oxidation reaction, but the addition of the adsorbent further improves the removal efficiency, and it can effectively adsorb the organic matter remaining on the flocs to ensure more thorough purification; the application of the catalyst accelerates the decomposition of the oxidant and produces more strongly oxidizing substances, which have a stronger effect on the decomposition of organic matter; the stabilizer plays an important role in this, which prevents the excessive formation of colloidal particles during the coagulation process, which not only ensures the coagulation effect, but also reduces the burden of subsequent treatment; the use of the inhibitor effectively inhibits the activity of harmful substances and prevents them from interfering with the oxidation process, thereby ensuring the efficient use of the oxidant; and the auxiliary agent optimizes the water quality, so that all components work together in the best state to improve the removal rate of organic matter in the water.

[0019] In addition to providing an efficient and environmentally friendly COD remover, the present invention also provides a method for preparing the efficient and environmentally friendly COD remover, comprising the following steps: The oxidant, coagulant, adsorbent, catalyst, stabilizer and inhibitor are added in sequence, mixed and stirred, and finally a highly efficient and environmentally friendly COD remover is prepared.

[0020] Preferably, the pH value of the COD remover solution is adjusted by adding an auxiliary agent after sequentially adding, mixing and stirring.

[0021] The preparation process of the invention is simple to operate, the raw materials are widely available, the cost is low, and the raw materials are harmless, and no harm is caused to the body of the operator during the preparation process, and the invention has high economy and practicality.

[0022] Compared with the prior art, the present invention has the following beneficial effects: (1) While the oxidant is decomposing organic matter, the inorganic small molecules produced can serve as auxiliary coagulation of the coagulant to enhance the coagulation effect. At the same time, the coagulant removes organic and inorganic matter together through coagulation, reducing the amount of oxidant used and reducing the treatment cost. While adsorbing organic matter, the adsorbent provides many attachment sites for the catalyst, allowing the catalyst to catalyze the oxidation reaction more effectively. The use of the catalyst accelerates the adsorption of organic matter by the adsorbent and improves the removal efficiency. The ion strength of the COD remover solution is adjusted by the stabilizer to provide a stable reaction environment for the inhibitor. The inhibitor protects the effect of the stabilizer by inhibiting possible side reactions, making the entire treatment process more stable and reliable. The addition of the auxiliary agent makes the COD remover of the present invention more flexible and convenient when used; the auxiliary agent for pH adjustment can be quickly adjusted according to the pH value requirements of different water qualities to ensure that the remover works under the optimal pH value conditions, and the surfactant can reduce the surface tension of water and improve the dispersibility and stability of the remover in water. The high-efficiency and environmentally friendly COD remover of the present invention realizes rapid and efficient removal of organic matter in water through the synergistic effect of various components, while maintaining stable water quality and environmental friendliness.

[0023] (2) The COD remover of the present invention is environmentally friendly, non-toxic and harmless. It will not produce harmful gases or residues during use and will not cause secondary pollution to the environment.

[0024] (3) By adjusting the composition and ratio of the COD remover within a certain range, it can adapt to different water quality and treatment requirements and has wide applicability. DETAILED DESCRIPTION

[0025] The technical scheme of the present invention will be clearly and completely described below in conjunction with specific embodiments, but it will be appreciated by those skilled in the art that the following described embodiments are part of embodiments of the present invention, rather than all embodiments, and are only used to illustrate the present invention, and should not be considered as limiting the scope of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work, all belong to the scope of protection of the present invention. If specific conditions are not indicated in the embodiments, they are carried out according to normal conditions or conditions recommended by the manufacturer. If the manufacturer is not indicated in the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0026] Example 1 The specific preparation process of the COD remover of this embodiment is carried out according to the following steps: (1) Weigh 10g potassium permanganate, 30g polyaluminium chloride, 40g activated carbon, 10g ferric chloride, 30g sodium chloride and 3g sodium sulfate and place them in different clean glass bottles for later use; (2) Add 50 g of deionized water into the reactor, and add the above-prepared materials in the order of weighing, namely potassium permanganate, polyaluminium chloride, activated carbon, ferric chloride, sodium chloride and sodium sulfate into the reactor in sequence; turn on the stirring device of the reactor, control it at 80 rpm, and continue stirring for 55 minutes to allow all the materials to be completely dissolved to form a uniform solution.

[0027] (3) Add an appropriate amount of calcium hydroxide to the solution obtained above to adjust the pH value of the solution to 7, and continue stirring for 12 minutes until it is completely dissolved; filter the solution with the adjusted pH value to remove the impurities and obtain a COD remover solution.

[0028] Example 2 The specific preparation process of the COD remover of this embodiment is carried out according to the following steps: (1) Weigh 20 g of ammonium chloride, 50 g of polyacrylamide, 60 g of sodium carbonate, 20 g of copper chloride, 40 g of ethyl acetate and 8 g of aluminum sulfate and place them in different clean glass bottles for later use; (2) First, add 55 g of deionized water into the reactor, and then add the above-prepared materials in the order of weighing, namely, ammonium chloride, polyacrylamide, sodium carbonate, cupric chloride, ethyl acetate and aluminum sulfate into the reactor; turn on the stirring device of the reactor, control it at 80 rpm, and continue stirring for 53 minutes to allow all materials to be completely dissolved to form a uniform solution.

[0029] (3) Add an appropriate amount of sodium hydroxide to the solution obtained above to adjust the pH value of the solution to 9, and continue stirring for 8 minutes until it is completely dissolved; filter the solution with the adjusted pH value to remove the impurities and obtain a COD remover solution.

[0030] Example 3 The specific preparation process of the COD remover of this embodiment is carried out according to the following steps: (1) Place 26g potassium permanganate, 45g polyacrylamide, 55g activated carbon, 16g copper chloride, 33g aluminum hydroxide and 4g magnesium sulfate in different clean glass bottles for later use; (2) First, add 45 g of deionized water into the reactor, and then add the above-prepared materials in the order of weighing, namely potassium permanganate, polyacrylamide, activated carbon, copper chloride, aluminum hydroxide and magnesium sulfate into the reactor; turn on the stirring device of the reactor, control it at 85 rpm, and continue stirring for 60 minutes to allow all materials to completely dissolve and form a uniform solution.

[0031] (3) Add an appropriate amount of calcium hydroxide to the solution obtained above to adjust the pH value of the solution to 7, and continue stirring for 10 minutes until it is completely dissolved; filter the solution with the adjusted pH value to remove the impurities and obtain a COD remover solution.

[0032] Example 4 The specific preparation process of the COD remover of this embodiment is carried out according to the following steps: (1) Weigh 27g of hydrogen peroxide, 35g of polyaluminium chloride, 45g of activated carbon, 11g of ferric chloride, 38g of ethyl acetate and 7g of sodium silicate and place them in different clean glass bottles for later use; (2) First, add 57 g of deionized water into the reactor, and then add the above-prepared materials in the order of weighing, namely, hydrogen peroxide, polyaluminum oxide, activated carbon, ferric chloride, ethyl acetate and sodium silicate into the reactor; turn on the stirring device of the reactor, control it at 75 rpm, and continue stirring for 65 minutes to allow all materials to completely dissolve and form a uniform solution.

[0033] (3) Add an appropriate amount of sodium hydroxide to the solution obtained above to adjust the pH value of the solution to 10, and continue stirring for 15 minutes until it is completely dissolved; filter the solution with the adjusted pH value to remove the impurities and obtain a COD remover solution.

[0034] Example 5 (1) Weigh 25g of sodium chloride, 40g of polyaluminium chloride, 50g of sodium carbonate, 13g of copper chloride, 36g of aluminium hydroxide and 5g of magnesium sulfate and place them in different clean glass bottles for later use; (2) First, add 50 g of deionized water into the reactor, and then add the above-prepared materials in the order of weighing, namely sodium chloride, polyaluminium chloride, sodium carbonate, cupric chloride, aluminium hydroxide and magnesium sulfate into the reactor; turn on the stirring device of the reactor, control it at 80 rpm, and continue stirring for 55 minutes to allow all the materials to completely dissolve and form a uniform solution.

[0035] (3) Add an appropriate amount of calcium hydroxide to the solution obtained above to adjust the pH value of the solution to 8, and continue stirring for 12 minutes until it is completely dissolved; filter the solution with the adjusted pH value to remove the impurities and obtain a COD remover solution.

[0036] Example 6 The specific implementation method is consistent with Example 5, except that calcium hydroxide (auxiliary agent) is replaced by an equal mass of hydrochloric acid.

[0037] Example 7 The specific implementation method is consistent with Example 5, except that the mass fraction of sodium chloride is changed to 16g.

[0038] Comparative Example 1 The specific implementation method is consistent with Example 5, and the dosage of each substance is changed. The specific changes are shown in Table 1.

[0039] Table 1. Changes in dosage of each substance

[0040] Comparative Example 2 Choose a common COD remover on the market, whose main ingredients are polymer, sodium hypochlorite and hydrogen peroxide.

[0041] Experimental Example 1 The treated wastewater was selected and divided equally. After testing, the COD content in the wastewater was 300 mg / L. The products prepared in the above embodiments and comparative examples were experimented, and their COD removal rates were measured. They were put into the equally divided wastewater, stirred continuously and then allowed to stand for 2 hours. The liquid in the treated wastewater was taken out to measure its COD value. The experimental results are shown in Tables 2 and 3.

[0042] Table 2. Experimental data of the examples

[0043] Table 3. Experimental data of comparative example

[0044] Based on the above data, we can draw the following conclusions: Through the record of the above data, it can be seen that the synergistic effect between the components of the present invention is very important. In Example 1-Example 7, excellent removal effect is shown. Compared with the remover sold on the market, that is, Comparative Example 2, it can be learned that when the dosage of the agent is 100ppm, the COD removal rate is as high as more than 97.9%, and can reach up to 98.9%. Compared with Comparative Example 2, under the same dosage of 100ppm, the COD removal rate is not 70%, even when the dosage of the agent is increased to 150ppm, the COD removal rate is far from reaching the level of the embodiment, which further proves that the COD remover of the present invention has a very high removal efficiency and can significantly reduce the COD content in the wastewater.

[0045] By comparing the experimental data of the embodiment and the comparative example, it can be seen that the raw materials configured in a certain proportion in the embodiment can produce a significant synergistic effect, so that the COD removal rate of the embodiment is much better than the COD removal rate of the comparative example. It can be seen from Scheme 1 to Scheme 12 in Comparative Example 1 that by changing the amount of each material, the removal effect of the COD remover obtained is not as good as the COD remover of the embodiment. The highest COD removal rate of the COD remover in Comparative Example 1 is only 79.1%, which shows the synergistic effect between the components. When the content of individual components is too much or too little, it will seriously affect the removal rate of the COD remover of the present invention; Comparative Example 2 uses a common COD remover available on the market. Even if the dosage of the agent is increased, its COD removal rate is much lower than that of the embodiment. This shows that the COD remover of the present invention is not prepared by simply randomly configuring the types of oxidants, coagulants, adsorbents, catalysts, stabilizers, inhibitors and auxiliary agents. The types and ratios of the raw materials in the present invention are crucial to improving the COD removal rate. Only by controlling the ratio of the raw materials within a certain range can the synergistic effect between the raw materials be achieved, ensuring that the COD remover of the present invention exerts the best removal effect.

[0046] In the embodiment, an appropriate amount of sodium hydroxide or calcium hydroxide or hydrochloric acid is added as an auxiliary agent to adjust the pH value of the COD remover solution, thereby facilitating the reaction and synergistic effect between the components and improving the removal effect of the COD remover of the present invention in the water body.

[0047] It can be seen from the observation that the remover prepared in Example 5 achieved the highest COD removal rate in the experiment, reaching 98.9%, which fully proves that the COD remover provided by the present invention has excellent treatment efficiency under the condition of optimized ratio. By comparing the effects between Examples 1-7, it can be seen that the type and ratio of raw materials also have an impact on the COD remover finally prepared, further verifying the optimality of the ratio range described in the present invention.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements 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 highly efficient and environmentally friendly COD remover, characterized in that: The invention is mainly prepared from the following raw materials in parts by mass: 10-27 parts of oxidant, 30-50 parts of coagulant, 40-60 parts of adsorbent, 10-20 parts of catalyst, 30-40 parts of stabilizer and 3-8 parts of inhibitor.

2. The highly efficient and environmentally friendly COD remover according to claim 1, characterized in that: In parts by mass: 16-26 parts of oxidant, 35-45 parts of coagulant, 45-55 parts of adsorbent, 11-16 parts of catalyst, 33-38 parts of stabilizer, and 4-7 parts of inhibitor.

3. The highly efficient and environmentally friendly COD remover according to claim 1, characterized in that: In parts by mass: 25 parts of oxidant, 40 parts of coagulant, 50 parts of adsorbent, 13 parts of catalyst, 36 parts of stabilizer, and 5 parts of inhibitor.

4. The highly efficient and environmentally friendly COD remover according to any one of claims 1 to 3, characterized in that: The oxidant is one or more of potassium permanganate, hydrogen peroxide, ammonium chloride and sodium chloride.

5. The highly efficient and environmentally friendly COD remover according to any one of claims 1 to 3, characterized in that: The coagulant is one or more of polyaluminium chloride and polyacrylamide.

6. The highly efficient and environmentally friendly COD remover according to any one of claims 1 to 3, characterized in that: The adsorbent is one or more of activated carbon and sodium carbonate.

7. The highly efficient and environmentally friendly COD remover according to any one of claims 1 to 3, characterized in that: The catalyst is at least one of transition metal ions.

8. The highly efficient and environmentally friendly COD remover according to any one of claims 1 to 3, characterized in that: The inhibitor is one or more of sodium sulfate, aluminum sulfate, magnesium sulfate and sodium silicate.

9. A method for preparing a highly efficient and environmentally friendly COD remover according to any one of claims 1 to 8, characterized in that: The steps include: The oxidant, coagulant, adsorbent, catalyst, stabilizer and inhibitor are added in sequence, mixed and stirred, and finally a highly efficient and environmentally friendly COD remover is prepared.

10. The method for preparing a highly efficient and environmentally friendly COD remover according to claim 9, characterized in that: After adding and mixing in sequence, an auxiliary agent is added to adjust the pH value of the COD remover solution.

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