LED light strategy for improving waste water treatment energy efficiency of spirulina

Abstract

The invention discloses an LED (light-emitting diode) light strategy for improving the efficiency of treating waste water by using spirulina, which comprises the following operation steps: step 1, introducing aquaculture waste water into a column tube, and then adding spirulina into the column tube; 2, an LED lamp tube is connected to the outer surface of the Column tube in a wound mode, irradiation of the LED lamp tube is used for providing sufficient illumination for the spirulina, photosynthesis of the spirulina is improved, the LED lamp tube is used for adjusting the light quality and the light intensity, and therefore the protein content and biomass changes of the spirulina are obtained. The whole treatment process of the aquaculture wastewater is connected through a conveying pipeline. Compared with the prior art, the method has the advantages that the efficiency and stability of spirulina in wastewater treatment can be further improved by reasonably adjusting the light intensity and optimizing the illumination condition, the wastewater treatment effect is remarkably improved, and green and sustainable development of the aquaculture industry is promoted.

Description

Technical Field

[0001] The invention relates to the technical field of light intensity compensation in the field of aquaculture wastewater treatment, and specifically to an LED light strategy for improving the energy efficiency of spirulina in treating aquaculture wastewater. Background Art

[0003] As a high-quality microalgae, Spirulina has great application potential in the field of wastewater treatment. It not only has the ability to efficiently absorb and remove pollutants such as ammonia nitrogen and nitrate nitrogen in water, effectively reducing the pollution load of wastewater, but also has a wide range of resource application value in animal feed, food supplements, etc. because it is rich in protein and various amino acids.

[0004] Photosynthesis of microalgae is the core process of its growth and wastewater treatment, and light intensity is a key factor affecting its photosynthetic efficiency, metabolic activity and growth rate. Studies have shown that appropriate light intensity can significantly increase the growth rate of microalgae and enhance its ability to absorb wastewater pollutants. However, too high or too low light intensity may lead to photoinhibition or light attenuation, thereby reducing the wastewater treatment effect. Current microalgae wastewater treatment systems generally have problems such as uneven light intensity distribution and unstable treatment effects due to differences in wastewater types. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the above technical defects and provide a method that can further improve the efficiency and stability of Spirulina in wastewater treatment by reasonably adjusting the light intensity and optimizing the lighting conditions, thereby significantly improving the wastewater treatment effect and promoting the green and sustainable development of the aquaculture industry.

[0006] In order to solve the above problems, the technical solution of the present invention is: an LED light strategy to improve the energy efficiency of spirulina wastewater treatment, comprising the following steps:

[0007] Step 1: introduce aquaculture wastewater into the column tube, and then add spirulina into the column tube;

[0008] Step 2: Wrap LED light tubes around the outer surface of the column tube, use the LED light tubes to provide sufficient light for Spirulina to increase its photosynthesis, and use the LED light tubes to adjust the light quality and intensity, so as to obtain the changes in the protein content and biomass of Spirulina.

[0009] Furthermore, in step 1 and step 2, the entire treatment process of the aquaculture wastewater is connected by a transmission pipeline.

[0010] Furthermore, the LED lamp tube is wound around the surface of the column tube, and the column tube is made of transparent material.

[0011] Further, based on the results of step 1 and step 2 above, red light was used with a light intensity of 450 μmol·m -2 ·s -1 When the aquaculture wastewater is treated with Spirulina, the effect is the best.

[0012] Furthermore, a balanced air pressure valve is provided on the left side of the column tube, and an air valve is provided on the right side.

[0013] The advantages of the present invention compared with the prior art are:

[0014] The present invention can further improve the efficiency and stability of Spirulina in wastewater treatment by rationally adjusting light intensity and optimizing lighting conditions. The present invention aims to provide a scientific light intensity control strategy to overcome the deficiencies in the prior art, significantly improve the wastewater treatment effect, and promote the green and sustainable development of the aquaculture industry;

[0015] Specifically, in the aquaculture wastewater system with 25% Zarrouk medium added, the growth of Spirulina and the wastewater treatment effect were significantly affected by light intensity. -2 ·s -1 Under high light intensity conditions, ammonia nitrogen NH can be efficiently utilized 4 + -N, the removal rate exceeded 95%. -2 ·s -1 Under the red light condition, the biomass accumulation of Spirulina was the most significant, and the total nitrogen TN and nitrate nitrogen NO 3 - -N had the best removal effect, reaching 1.59 g·L -1 The maximum biomass was 92.34% of nitrate removal efficiency and 99.79% of total nitrogen removal efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of column tube 4 of an LED light intensity method for improving the energy efficiency of spirulina wastewater treatment according to the present invention.

[0017] Figure 2 It is a line graph of the biomass change of Spirulina (Spirulina platensis 902) in a wastewater treatment system under different light quality conditions in a LED light intensity method for improving the energy efficiency of Spirulina in treating wastewater according to the present invention.

[0018] Figure 3 It is a bar graph of changes in the protein content of Spirulina (Spirulina platensis 902) in a wastewater treatment system under different light quality conditions in an LED light intensity method for improving the energy efficiency of Spirulina in treating wastewater according to the present invention.

[0019] Figure 4 This is Table 1 of data on the biomass changes of Spirulina (Spirulina platensis 902) in a wastewater treatment system under different light quality conditions according to an LED light intensity method for improving the energy efficiency of Spirulina in treating wastewater.

[0020] Figure 5 Table 2 is the data table of the change of the biomass of Spirulina (Spirulina platensis 902) in the wastewater treatment system under different light intensity conditions according to the LED light intensity method for improving the energy efficiency of Spirulina in treating wastewater of the present invention.

[0021] 1. LED light tube; 2. Air valve; 3. Balanced air pressure valve; 4. Column tube. DETAILED DESCRIPTION

[0022] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings, wherein the same components are represented by the same reference numerals.

[0023] It should be noted that the words "front", "rear", "left", "right", "up" and "down" used in the following description refer to directions in the drawings, and the words "inside" and "outside" refer to directions toward or away from the geometric center of a specific component, respectively.

[0024] In order to make the contents of the present invention more clearly understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0025] like Figures 1 to 5 As shown, an LED light strategy for improving the energy efficiency of spirulina wastewater treatment includes the following steps:

[0026] Step 1: introducing aquaculture wastewater into column pipe 4, and then adding spirulina into column pipe 4;

[0027] Step 2: Wrap the LED lamp tube 1 around the outer surface of the column tube 4, use the LED lamp tube 1 to provide sufficient light for the spirulina to increase its photosynthesis, and use the LED lamp tube 1 to adjust the light quality and light intensity, so as to obtain the changes in the protein content and biomass of the spirulina.

[0028] In step 1 to step 2, the entire treatment process of the aquaculture wastewater is connected through a conveying pipeline, the LED lamp tube 1 is wrapped around the surface of the column tube 4, and the column tube 4 is made of transparent material. A balanced air pressure valve 3 is provided on the left side of the column tube 4, and an air valve 2 is provided on the right side.

[0029] Based on the results of steps 1 and 2 above, red light was used with a light intensity of 450 μmol·m -2 ·s -1 When , the treatment effect of Spirulina wastewater is optimal.

[0030] In specific use, different light qualities showed a significant effect on the growth of Spirulina platensis902 (p<0.05). Among them, red light was most conducive to the accumulation of Spirulina biomass, reaching a maximum value of 1.13 gL on the 12th day of culture. -1 ,like Figure 2 As shown in the figure, the biomass of Spirulina under white light, blue light and mixed light conditions also reached a peak on the 12th day of culture, which were 0.775 g L -1 , 0.575gL -1 and 0.9 gL -1 ,like Figure 2 As shown in the figure, the maximum biomass of Spirulina under red light conditions was significantly higher than that under other light quality conditions, which were 1.46 times, 1.97 times and 1.26 times those under white light, blue light and mixed light conditions, respectively (p<0.05). In addition, the change trend of ash-free dry weight of Spirulina under different light quality conditions was basically consistent with that of dry weight, such as Figure 2 As shown, it indicates that light quality has a consistent effect on the biomass accumulation of Spirulina.

[0031] Under different light quality conditions, there were differences in the protein content of Spirulina platensis902 in the aquaculture wastewater treatment system. On the 12th day, under white light and red light conditions, the protein content of Spirulina increased slightly to 64.94% and 58.27%, respectively, which was an increase from the initial protein content of 57.06% at the time of inoculation. Under blue light and mixed light conditions, the protein content of Spirulina decreased below the initial level, to 47.54% and 51.46%, respectively. In summary, the protein content of Spirulina under white light and red light conditions was higher than that under mixed light and blue light conditions. Figure 3 shown.

[0032] Different light intensities (100, 200, 300, 450, 600 μmol m -2 s -1 ) on the nutrient removal efficiency, biomass accumulation and biochemical composition of Spirulina platensis902 in aquaculture wastewater treatment, aiming to provide a theoretical basis and practical support for optimizing microalgae wastewater treatment technology based on light intensity control. Through simulation experiments in a photobioreactor, the results showed that 450 μmol m -2 s -1 The red light intensity was most conducive to the biomass accumulation of Spirulina and the total nitrogen removal rate, reaching 1.59 g L-1 The biomass peak and TN removal efficiency of 99.79% were achieved. In addition, 450 and 600 μmol m -2 s -1 Under different light intensity conditions, the accumulation of carbon (C) and nitrogen (N) in Spirulina in the aquaculture wastewater treatment system was significantly higher, with 450 μmol m -2 s -1 The accumulation of C and N elements under the light intensity was slightly higher than 600 μmol m -2 s -1 Light intensity. At 100, 200 and 300 μmol m -2 s -1 Under the light intensity conditions, the removal of N in the wastewater system relies more on non-algae pathways.

[0033] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. An LED light strategy for improving the energy efficiency of spirulina wastewater treatment, characterized by: The steps include: Step 1: introducing aquaculture wastewater into the column pipe (4), and then adding spirulina into the column pipe (4); Step 2: An LED light tube (1) is wound around the outer surface of the column tube (4), and the LED light tube (1) is used to provide sufficient light for the spirulina to increase its photosynthesis. The LED light tube (1) is used to adjust the light quality and light intensity, thereby obtaining changes in the protein content and biomass of the spirulina.

2. The LED light strategy for improving the energy efficiency of spirulina wastewater treatment according to claim 1, characterized in that: In step 1 to step 2, the entire treatment process of the aquaculture wastewater is connected by a transmission pipeline.

3. The LED light strategy for improving the energy efficiency of spirulina wastewater treatment according to claim 1, characterized in that: The LED lamp tube (1) is wound around the surface of the column tube (4), and the column tube (4) is made of a transparent material.

4. The LED light strategy for improving the energy efficiency of spirulina wastewater treatment according to claim 1, characterized in that: Based on the results of steps one and two above, the treatment effect of Spirulina wastewater is optimal when red light is used with a light intensity of 450 μmol·m-2·s-1.

5. The LED light strategy for improving the energy efficiency of spirulina wastewater treatment according to claim 1, characterized in that: The column tube (4) is provided with a balanced air pressure valve (3) on the left side and an air valve (2) on the right side.

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