Method for removing drug pollutants in water by compounding tea saponin and moringa seed protein

Abstract

The invention discloses a method for removing drug pollutants in water by compounding tea saponin and moringa seed protein. The method comprises the following steps: sequentially adding tea saponin and moringa seed protein into a reactor containing medicine wastewater according to a mass ratio, and ensuring that the tea saponin and the moringa seed protein are uniformly dispersed; adjusting the pH value of the wastewater to a proper range, and keeping the temperature under a proper condition; quickly stirring for a period of time, and then slowly stirring to promote full combination of the drug pollutants, the tea saponin and the moringa seed protein; and after standing and precipitating, separating the precipitate from the wastewater by a filtering or centrifuging method so as to realize drug removal. The process is simple, convenient and environment-friendly, the tea saponin and the moringa seed protein extracted from the tea leaves and the moringa tree seeds are utilized, introduction of harmful chemical components is avoided, and the method is harmless to the environment and safe to a human body. Meanwhile, the method has a remarkable cost advantage compared with a traditional chemical flocculant while effectively removing drug pollutants in water.

Description

Technical Field

[0001] The invention belongs to the field of wastewater treatment, and specifically relates to a method for removing drug pollutants in water by combining tea saponin and moringa seed protein. Background Art

[0002] China is one of the most populous countries in the world, and drugs are widely used in the medical and agricultural fields. However, this widespread use has also brought a series of negative effects, one of which is the generation of pharmaceutical wastewater. Pharmaceutical wastewater not only poses a serious threat to the environment, but pharmaceutical pollution has been detected in multiple locations in China's seven major rivers and other waters. At the same time, pharmaceutical wastewater also exacerbates the problem of antibiotic resistance and threatens the health of humans and animals. Therefore, how to remove pharmaceutical pollutants in water efficiently, economically and greenly has become an urgent problem to be solved.

[0003] At present, the commonly used treatment methods for pharmaceutical wastewater include adsorption, advanced oxidation, membrane separation, coagulation / flocculation, etc. Although the adsorption method is effective, it needs to be replaced in time when the adsorbent reaches saturation. Advanced oxidation has a good degradation effect on drugs, but its operating costs are high and it is not suitable for large-scale application. Membrane separation technology can effectively remove drugs, is simple to operate and has significant effects, but membrane pollution problems and high costs limit its promotion. In contrast, coagulation / flocculation, as a common water treatment process, has a high cost-effectiveness and development value. In recent years, with the development of coagulation / flocculation technology, it has gradually been applied in drug removal. By adjusting the type and dosage of coagulants and flocculants and optimizing process conditions, pollutants can be encouraged to form larger floc particles for sedimentation and separation, thereby effectively removing pharmaceutical pollutants from water.

[0004] The Chinese patent application publication number is CN106082511A, and the invention name is "A method for deep removal of antibiotics in water". It discloses a method for deep removal of antibiotics in water using ultrasonic assisted oxidation and solid-liquid separation technology. The method has the characteristics of simple treatment process, high removal depth and wide applicability, but its operating conditions are harsh and the treatment cost is high.

[0005] Chinese patent application publication number CN116354481A, invention name "A method for preparing a photosensitive flocculant and its application", discloses a method for preparing a photosensitive flocculant formed by light-induced self-assembly, having photoresponsiveness and enhanced flocculation performance, and its application in water treatment. It utilizes low-cost raw materials and achieves a high efficiency in pollutant removal rate. However, its preparation process has a high dependence on precise operating conditions, and the required equipment cost is relatively high.

[0006] Therefore, it is very necessary to develop a method for removing various drugs from water bodies with simple operating conditions, good removal effect and environmental friendliness. Summary of the invention

[0007] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for removing drug pollutants in water by combining tea saponin and Moringa seed protein.

[0008] In order to achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] Tea saponin and moringa seed protein are added to the reactor containing drug wastewater in turn according to the mass ratio, the pH value of the wastewater is adjusted to an appropriate range, and the two are ensured to be evenly dispersed; the temperature is maintained under appropriate conditions, and rapid stirring is performed for a period of time, followed by slow stirring to promote the full combination of the drug, tea saponin and moringa seed protein; after standing and settling, the precipitate is separated from the wastewater by filtration or centrifugation to achieve drug removal.

[0010] The specific steps include:

[0011] (1) For the removal of drug pollutants such as tetracycline hydrochloride, ciprofloxacin and diclofenac sodium in water bodies, the concentration range is 1 to 20 mg / L.

[0012] (2) Tea saponin and Moringa seed protein were added into a reactor containing pharmaceutical wastewater in a mass ratio of 1 to 4:1, with the addition amount of tea saponin being 50 to 250 mg / L, and ensuring that the two were evenly dispersed.

[0013] (3) Adjust the pH value of the wastewater to 7-9 and maintain the temperature at 20-40°C.

[0014] (4) Stir rapidly for 1 to 5 minutes and then slowly for 10 to 20 minutes to promote the full combination of drug pollutants, tea saponins and Moringa seed protein, let it stand for 20 minutes, and separate the precipitate from the wastewater by filtration or centrifugation to achieve drug removal.

[0015] Wherein: in step (2), tea saponin and moringa seed protein are sequentially added to the reactor containing pharmaceutical wastewater in a mass ratio of 1 to 4:1. When the mass ratio of tea saponin to moringa seed protein is too low, effective flocs cannot be formed; when the mass ratio of tea saponin to moringa seed protein is too high, the material cost will increase.

[0016] The pH value in step (3) is 7 to 9. When the pH value is too low or too high, the Moringa seed protein may denature.

[0017] In step (3), the reaction temperature is controlled at 20-40° C. When the reaction temperature is too low, the reaction rate is slow; when the reaction temperature is too high, the reaction rate is not significantly improved, and the energy consumption is high.

[0018] The rapid stirring in step (4) is for 1 to 5 minutes. The purpose is to ensure that the drug pollutants, tea saponins and moringa seed proteins are fully dispersed and initially combined to form tiny composite particles. If the stirring time is too short, it is not conducive to the full contact between the drug pollutants, tea saponins and moringa seed proteins; if the stirring time is too long, the generated flocs may be broken due to high shear force.

[0019] The slow stirring in step (4) is for 10 to 20 minutes. The purpose is to promote the aggregation of composite particles under mild conditions and gradually generate larger flocs. If the stirring time is too short, the flocs will begin to precipitate before they are fully grown, resulting in smaller particles, poor sedimentation effect, and reduced removal rate; if the stirring time is too long, the overall processing time will be extended, increasing the operating cost.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. This method is simple and environmentally friendly. Tea saponin is extracted from tea leaves, and moringa seed protein is extracted from the seeds of the moringa tree. Both are natural substances and will not introduce harmful chemical components. They are harmless to the environment and safe for the human body.

[0022] 2. This method can not only effectively remove pharmaceutical pollutants in water, but also has a great cost advantage compared to traditional chemical flocculants. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below with reference to specific embodiments. Unless otherwise specified in the embodiments, the raw materials used are common commercially available products.

[0024] Embodiment 1:

[0025] (1) For the removal of tetracycline hydrochloride pollutants in water bodies, the concentration is 20 mg / L.

[0026] (2) Tea saponin and Moringa seed protein were added into the reactor containing pharmaceutical wastewater in a mass ratio of 1:1, with the addition amount of tea saponin being 30 mg / L, and ensuring that both were evenly dispersed.

[0027] (3) Adjust the pH value of the wastewater to 7 and maintain the temperature at 20°C.

[0028] (4) Stir rapidly for 1 min and then slowly for 10 min to promote the full combination of drug pollutants, tea saponin and Moringa seed protein, let it stand for 20 min, and separate the precipitate from the wastewater by filtration or centrifugation to achieve drug removal.

[0029] Embodiment 2:

[0030] (1) For the removal of tetracycline hydrochloride pollutants in water bodies, the concentration is 10 mg / L.

[0031] (2) Tea saponin and moringa seed protein were added into the reactor containing pharmaceutical wastewater in a mass ratio of 2:1, with the addition amount of tea saponin being 40 mg / L, and ensuring that both were evenly dispersed.

[0032] (3) Adjust the pH value of the wastewater to 7 and maintain the temperature at 20°C.

[0033] (4) Stir rapidly for 2 min and then slowly for 15 min to promote the full combination of drug pollutants, tea saponin and Moringa seed protein, let it stand for 20 min, and separate the precipitate from the wastewater by filtration or centrifugation to achieve drug removal.

[0034] Embodiment 3:

[0035] (1) For the removal of ciprofloxacin pollutants in water bodies, the concentration is 1 mg / L.

[0036] (2) Tea saponin and Moringa seed protein were added into the reactor containing pharmaceutical wastewater in a mass ratio of 3:1, with the addition amount of tea saponin being 30 mg / L, and ensuring that both were evenly dispersed.

[0037] (3) Adjust the pH value of the wastewater to 8 and maintain the temperature at 40°C.

[0038] (4) Stir rapidly for 3 min and then slowly for 20 min to promote the full combination of drug pollutants, tea saponin and Moringa seed protein, let it stand for 20 min, and separate the precipitate from the wastewater by filtration or centrifugation to achieve drug removal.

[0039] Embodiment 4:

[0040] (1) For the removal of ciprofloxacin pollutants in water bodies, the concentration is 5 mg / L.

[0041] (2) Tea saponin and Moringa seed protein were added into the reactor containing pharmaceutical wastewater in a mass ratio of 4:1, with the addition amount of tea saponin being 40 mg / L, and ensuring that both were evenly dispersed.

[0042] (3) Adjust the pH value of the wastewater to 9 and maintain the temperature at 25°C.

[0043] (4) Stir rapidly for 5 min and then slowly for 15 min to promote the full combination of drug pollutants, tea saponin and Moringa seed protein, let it stand for 20 min, and separate the precipitate from the wastewater by filtration or centrifugation to achieve drug removal.

[0044] Embodiment 5:

[0045] (1) For the removal of diclofenac sodium pollutants in water bodies, the concentration is 20 mg / L.

[0046] (2) Tea saponin and Moringa seed protein were added into the reactor containing pharmaceutical wastewater in a mass ratio of 1:1, with the addition amount of tea saponin being 30 mg / L, and ensuring that both were evenly dispersed.

[0047] (3) Adjust the pH value of the wastewater to 7 and maintain the temperature at 20°C.

[0048] (4) Stir rapidly for 3 min and slowly for 10 min to promote the full combination of drug pollutants, tea saponin and Moringa seed protein, let it stand for 20 min, and separate the precipitate from the wastewater by filtration or centrifugation to achieve drug removal.

[0049] Embodiment 6:

[0050] (1) For the removal of diclofenac sodium pollutants in water bodies, the concentration is 10 mg / L.

[0051] (2) Tea saponin and Moringa seed protein were added into the reactor containing pharmaceutical wastewater in a mass ratio of 3:1, with the addition amount of tea saponin being 30 mg / L, and ensuring that both were evenly dispersed.

[0052] (3) Adjust the pH value of the wastewater to 8 and maintain the temperature at 40°C.

[0053] (4) Stir rapidly for 3 min and slowly for 10 min to promote the full combination of drug pollutants, tea saponin and Moringa seed protein, let it stand for 20 min, and separate the precipitate from the wastewater by filtration or centrifugation to achieve drug removal.

[0054] The removal rates of the tea saponin and Moringa seed protein composites for removing pharmaceutical pollutants in water were measured respectively in Examples 1 to 6, and the data are shown in Table 1.

[0055] Table 1 Removal rate of drug pollutants in water by combining tea saponin and Moringa seed protein

[0056]

[0057]

[0058] As can be seen from Table 1 above, the tea saponin and Moringa seed protein compound involved in the present invention shows excellent and stable effect in removing drug pollutants in water, and has a high removal efficiency. Its removal effect on various drug pollutants is stable and efficient, proving that this is a feasible and effective method for removing drug pollutants in water.

[0059] Finally, it should be noted that the above embodiments of the present invention are only examples for illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes and modifications can be made based on the above description. It is impossible to list all implementation methods here. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A method for removing drug pollutants in water by combining tea saponin and Moringa seed protein, characterized in that: Add tea saponin and moringa seed protein to a reactor containing pharmaceutical wastewater in a mass ratio of 1 to 4:1, and ensure that the two are evenly dispersed; adjust the pH value of the wastewater to 7 to 9, and maintain the temperature at 20 to 40°C; stir rapidly for 1 to 5 minutes and slowly for 10 to 20 minutes to promote the full combination of pharmaceutical pollutants, tea saponin and moringa seed protein; let it stand for 20 minutes, and separate the precipitate from the wastewater by filtration or centrifugation to achieve drug removal.

2. The method for removing drug pollutants in water by combining tea saponin and Moringa seed protein according to claim 1, characterized in that: The dosage of the tea saponin is 50-250 mg / L.

3. The method for removing drug pollutants in water by combining tea saponin and Moringa seed protein according to claim 1, characterized in that: The concentration range of the pharmaceutical pollutants in the water is 1 to 20 mg / L.

4. The method for removing drug pollutants in water by combining tea saponin and Moringa seed protein according to claim 1, characterized in that: The pharmaceutical pollutants in the water include tetracycline hydrochloride, ciprofloxacin and diclofenac sodium.

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