Application of aquatic plants in removing diazepam residues from water bodies and methods for removing diazepam residues from water.

Abstract

This invention belongs to the field of biological treatment technology, specifically relating to the application of aquatic plants in removing diazepam residues from water bodies and methods for removing diazepam residues from water. This invention uses water hyacinth and / or water lettuce to remove diazepam residues from water bodies, effectively improving the removal rate of diazepam in water. As the plants grow and absorb the pollutants, the concentration of pollutants in the water gradually decreases, thereby enabling the reuse of the water.

Description

Technical Field

[0001] This invention belongs to the field of biological treatment technology, specifically relating to the application of aquatic plants in removing diazepam residues from water bodies and methods for removing diazepam residues from water. Background Technology

[0002] Diazepam has been detected in surface water, groundwater, and aquaculture water. In recent years, it has also been illegally used in aquaculture and transportation to slow down fish metabolism and reduce environmental stress. Aquaculture water is often recycled using wastewater recirculation technology, filtering the water before reuse. However, traditional adsorption methods cannot effectively remove diazepam from the recycled water, and the process of adsorption-separation-recirculation is prone to loss, difficulty in separation, and secondary pollution.

[0003] Phytoremediation is a low-cost, pollution-free in-situ ecological remediation technology with certain landscape value. Its plant roots can provide a suitable growth environment for microorganisms and play a role in intercepting and filtering suspended pollutants. At the same time, it can avoid the problems of difficult separation and recovery of pollutants in water treated by traditional adsorbents and the easy generation of secondary pollution. It is crucial for controlling the pollution level of such drugs.

[0004] Carmen G. Franks et al. published a study in the journal "Environmental Management" entitled "A Prescription for Drug-Free Rivers: Uptake of Pharmaceuticals by a Widespread Streamside Willow." The study showed that willow seedlings removed 40% of diazepam from water bodies within 24 hours in a greenhouse. However, the application of willow branches for diazepam remediation in aquatic environments has limitations; they are not as easy to plant and manage as floating plants. Reports indicate that wastewater treatment plants in Shanghai and other areas have poor effectiveness in removing diazepam and other psychotropic drugs, with an average removal rate of less than 50%. Therefore, seeking a method with a higher removal rate of diazepam from water is particularly important. Summary of the Invention

[0005] The purpose of this invention is to provide the application of aquatic plants in removing diazepam residues from water bodies, thereby improving the removal rate of pollutants in water when plants adsorb and treat residual pollutants.

[0006] This invention provides the application of aquatic plants in removing diazepam residues from water bodies, said aquatic plants including water hyacinth and / or water hyacinth.

[0007] The present invention also provides a method for removing diazepam residues from water, comprising planting plants in the water body to be restored; said plants include water hyacinth and / or water hyacinth.

[0008] Preferably, the planting areas of the plants are isolated from each other, and the area of ​​each planting area is 70×60cm.

[0009] Preferably, the temperature of the water body is 20–30°C.

[0010] Preferably, the planting density is 0.5–1.0 kg / m². 2 .

[0011] Preferably, the ambient temperature for planting is 20°C.

[0012] Preferably, the concentration of diazepam in the water body to be remediated is 0.03–0.67 μg / L.

[0013] Preferably, the water body to be restored includes aquaculture water.

[0014] Preferably, the planting period is 7 to 14 days.

[0015] Beneficial effects:

[0016] This invention applies water hyacinth and / or water hyacinth to remove diazepam residues from water bodies, which can effectively improve the removal rate of diazepam from water bodies by phytoremediation methods and realize the reuse of water bodies.

[0017] This invention pre-selects plants and plants them in the water body to be restored. The planting area is separated by ecological floating beds, which can effectively control the growth of the plants and facilitate the recycling of the plants. As the plants grow and absorb pollutants, the concentration of pollutants in the water body gradually decreases, thereby realizing the reuse of the water body.

[0018] Furthermore, by adjusting the water temperature and planting density, this invention can effectively improve the absorption efficiency of diazepam by water hyacinth and water hyacinth, effectively purify aquaculture water, and realize the reuse of aquaculture water. The solution of this invention can achieve the best restoration effect at a water temperature of 25℃. In spring and autumn, water hyacinth and / or water hyacinth can be directly planted in the water to produce good restoration effect without the need for additional water heating. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the embodiments will be briefly described below.

[0020] Figure 1 Dynamic residual concentration of diazepam in the water for treating water hyacinth;

[0021] Figure 2 The dynamic residual concentration of diazepam in water treated with dapoxetine was determined. Detailed Implementation

[0022] This invention provides the application of aquatic plants in removing diazepam residues from water bodies, said aquatic plants including water hyacinth and / or water hyacinth.

[0023] The present invention also provides a method for removing diazepam residues from water, comprising planting plants in the water body to be restored; said plants include water hyacinth and / or water hyacinth.

[0024] In this invention, after planting the aquatic plants, it is preferable to isolate the planting areas from each other, with each planting area measuring 70×60cm. This method of isolating the planting areas effectively controls plant growth, facilitates plant recycling, and as the plants grow and absorb pollutants, the concentration of pollutants in the water gradually decreases, thereby enabling the reuse of the water.

[0025] In this invention, the temperature of the water body is preferably 20–30°C, more preferably 25°C; the planting density is preferably 0.5–1.5 kg / m². 2 More preferably, it is 1.0–1.5 kg / m³. 2 More preferably 1.5 kg / m 2 The preferred ambient temperature for planting is 20℃; the preferred planting duration is 7–14 days, more preferably 7–13 days, and most preferably 7 days. This invention, by adjusting the water temperature, planting density, and planting duration, can effectively improve the elimination rate of diazepam in water by water hyacinth and / or water hyacinth, achieving highly efficient removal of diazepam from water. Furthermore, the solution of this invention achieves optimal remediation results at a water temperature of 25℃, and good remediation effects can be produced by directly planting water hyacinth and / or water hyacinth in water during spring and autumn without the need for additional water heating.

[0026] In this invention, the concentration of diazepam in the water body to be restored is preferably 0.03-0.67 μg / L, more preferably 0.22-0.67 μg / L, and even more preferably 0.51-0.67 μg / L; the water body to be restored preferably includes aquaculture water.

[0027] This invention utilizes the planting of water hyacinth and / or water hyacinth in water bodies where diazepam pollution has been detected to accelerate the degradation of diazepam. Examples show that planting water hyacinth can achieve a maximum diazepam elimination rate of 70.55% in water bodies; planting water hyacinth can achieve a maximum elimination rate of 60.51%.

[0028] To further illustrate the present invention, the method for removing diazepam residues from water and its application provided by the present invention will be described in detail below with reference to the accompanying drawings and embodiments, but these should not be construed as limiting the scope of protection of the present invention.

[0029] Example 1

[0030] Water bodies contaminated with diazepam were divided into 10 groups: the water hyacinth group (S1, S2, S3, S4, S5, S6, S7, S8, S9) and the blank control group (S10). The ambient temperature of each treatment group was controlled at 20℃. The water was placed in a white transparent box (70cm×60cm×40cm) to simulate a water tank environment, and a water pump (without filter cotton) was used to simulate the actual environmental water circulation. A heating device controlled the water temperature.

[0031] S1: Water temperature 20℃, water hyacinth planting density 0.5kg / m² 2 ;

[0032] S2: Water temperature 20℃, water hyacinth planting density 0.8kg / m² 2 ;

[0033] S3: Water temperature 20℃, water hyacinth planting density 1.0 kg / m² 2 ;

[0034] S4: Water temperature 25℃, water hyacinth planting density 0.5kg / m² 2 ;

[0035] S5: Water temperature 25℃, water hyacinth planting density 0.8kg / m² 2 ;

[0036] S6: Water temperature 25℃, water hyacinth planting density 1.0 kg / m² 2 ;

[0037] S7: Water temperature 30℃, water hyacinth planting density 0.5kg / m² 2 ;

[0038] S8: Water temperature 30℃, water hyacinth planting density 0.8kg / m² 2 ;

[0039] S9: Water temperature 30℃, water hyacinth planting density 1.0kg / m² 2 ;

[0040] S10: Water temperature 25℃, no plants.

[0041] For each group, water hyacinth plants with similar characteristics and good growth were selected. Before the experiment, the water hyacinths were rinsed with deionized water, dried with absorbent paper, and placed in a white transparent box (70cm×60cm×40cm). Any green algae or plants that occasionally grew in the blank control group were promptly removed to ensure no plant growth in the blank control group. Once there were no obviously surviving plants with yellowing, decay, or root rot in the simulation system, and all plants in each group had stabilized, the system was officially started and defined as D0. The first day of system operation was recorded as day 1. The optimal scheme for accelerating diazepam degradation was selected.

[0042] Test Example 1

[0043] Diazepam was selected as the water quality indicator for this experiment to detect its content in the water after water hyacinth remediation. The water quality was determined using liquid chromatography-mass spectrometry (LC-MS). Water sampling began at D0. Before sampling, the sampling bottle was rinsed and then placed 5 cm below the water surface along with the cap. The cap was opened to prevent suspended solids from entering the bottle. The bottle was filled to overflow, and the cap was tightened after ensuring no air bubbles remained. The samples were stored in a foam freezer and immediately sent to the laboratory for water quality analysis. The results are shown in Table 1 and... Figure 1 As shown.

[0044] Table 1. Residual concentration of diazepam in water remediated by water hyacinth

[0045]

[0046] From Table 1 and Figure 1 It is evident that the technical solution provided by this invention can effectively improve the elimination rate of diazepam in water by plants, achieving an elimination rate of 40.88–70.55% after 7 days and 43.34–70.36% after 13 days. This is particularly effective when the water temperature is 25°C and the planting density is 1 kg / m². 2 At that time, water hyacinth had the highest removal efficiency of diazepam in water, with a removal rate of 70.55% after 7 days. From the 7th day after planting, the removal rate of diazepam in water by water hyacinth no longer showed a significant improvement.

[0047] Example 2

[0048] Water bodies contaminated with diazepam were divided into 10 groups: a diazepam group (S1, S2, S3, S4, S5, S6, S7, S8, S9) and a blank control group (S10). The ambient temperature in each treatment group was controlled at 20℃. A water pump (without filter cotton) was used to simulate actual environmental water circulation, and a heating device was used to control the water temperature.

[0049] S1: Water temperature 20℃, water hyacinth planting density 0.5kg / m² 2 ;

[0050] S2: Water temperature 20℃, water hyacinth planting density 0.8kg / m² 2 ;

[0051] S3: Water temperature 20℃, water hyacinth planting density 1.0 kg / m³ 2 ;

[0052] S4: Water temperature 25℃, water hyacinth planting density 0.5kg / m² 2 ;

[0053] S5: Water temperature 25℃, water hyacinth planting density 0.8kg / m² 2 ;

[0054] S6: Water temperature 25℃, water hyacinth planting density 1.0 kg / m³ 2 ;

[0055] S7: Water temperature 30℃, water hyacinth planting density 0.5kg / m² 2 ;

[0056] S8: Water temperature 30℃, water hyacinth planting density 0.8kg / m² 2 ;

[0057] S9: Water temperature 30℃, water hyacinth planting density 1.0 kg / m³ 2 ;

[0058] S10: Water temperature 25℃, no plants.

[0059] For each group, select *Isatis tinctoria* plants with similar traits and good growth condition. Before the experiment, rinse the plants thoroughly with deionized water, dry them with absorbent paper, and place them in a white transparent box (70cm×60cm×40cm). Any green algae or plants that occasionally grow in the blank control group should be promptly removed to ensure no plant growth in the blank control group. Once there are no obviously surviving plants with yellowing, decay, or root rot in the simulation system, and all plants in each group have stabilized, the system will be officially run and defined as D0. The first day of system operation will be recorded as day 1. The optimal scheme for accelerating diazepam degradation will be selected.

[0060] Test Example 2

[0061] The diazepam content in the water after remediation with tamarisk was measured according to the method in Test Example 1. The results are shown in Table 2 and... Figure 2 As shown.

[0062] Table 2. Residual concentrations of diazepam in the reclaimed water treated with taro.

[0063]

[0064]

[0065] From Table 2 and Figure 2 It is evident that the technical solution provided by this invention can effectively improve the elimination rate of diazepam in water by plants, achieving an elimination rate of 40.54–56.59% after 7 days and 41.60–60.51% after 13 days. This is particularly effective when the water temperature is 25℃ and the planting density is 1 kg / m². 2 At that time, the removal efficiency of diazepam in water bodies was the highest, with a 7-day removal rate of 56.59% and a 13-day removal rate of 60.51%.

[0066] As can be seen from the above embodiments, water hyacinth and water lettuce can effectively remove diazepam residues in water. This application uses water hyacinth and water lettuce to remove diazepam residues in water, which effectively improves the removal rate of diazepam in water by phytoremediation methods and is conducive to the recycling of aquaculture water.

[0067] Although the above embodiments have provided a detailed description of the present invention, they are only some embodiments of the present invention, and not all embodiments. People can obtain other embodiments based on these embodiments without creative effort, and these embodiments all fall within the protection scope of the present invention.

Claims

1. The application of aquatic plants in removing diazepam residues from water bodies, characterized in that, Plant aquatic plants in the water bodies to be restored; The aquatic plants are floating plants, including water hyacinth and / or water hyacinth; The planting period is 7-14 days; The water temperature is 25℃, and the planting density is 1.0 kg / m². 2 ; The planting areas for the aquatic plants are isolated from each other using ecological floating beds, and each planting area has an area of ​​70×60cm. The ambient temperature for planting was 20℃; The concentration of diazepam in the water body to be remediated was 0.51~0.67 μg / L; The water bodies to be restored include aquaculture water bodies; Using the above methods, planting water hyacinth can achieve a maximum diazepam elimination rate of 70.55% in water bodies; planting water hyacinth can achieve a maximum diazepam elimination rate of 60.51% in water bodies.

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