A method for regulating diatom-dominated algal communities

Abstract

This invention discloses a method for regulating algal communities dominated by diatoms, relating to the field of river and lake water environment technology. It involves setting up a flotation purification zone, adding flocculants to initially settle large impurities, and simultaneously adding an air flotation device in this zone to allow floatable impurities to float and be dehydrated and removed by a screen. A sedimentation purification zone is set up, adding flocculants to cause colloidal particles to collide and form flocculent precipitates. An algal community regulation zone is set up to supplement carbon sources, enhance denitrification, reduce total nitrogen, and inhibit diatom growth. An enhanced treatment zone is set up, using floating island ecological walls to further purify the water, utilizing planktonic microorganisms to absorb wastewater and phytoplankton photosynthesis to achieve water purification. This invention uses diatoms as the dominant species, inhibiting their growth through water treatment, allowing green algae to gradually become the dominant species. This method effectively improves water quality, regulates algal communities, shifts the dominance of diatoms to green algae, eliminates water discoloration, and has broad application prospects.

Description

Technical Field

[0001] This invention relates to the field of water environment technology for river and lake systems, specifically to a method for regulating algal communities dominated by diatoms. Background Technology

[0002] Currently, the water color observed at various sites in the Qianhu water system is predominantly yellowish-green. Aside from the presence of water pumps, aeration, and human activities causing a muddy yellow hue, the predominantly diatom and green algae biomass detected at sampling points aligns with the resulting water color, indicating that algae are a significant factor influencing the water color of the Qianhu system. Furthermore, the biomass ratio of green algae to diatoms in the data shows that their growth mutually inhibits each other, with diatoms exhibiting greater competitiveness than green algae in the Qianhu system, contributing to the brownish-yellow color. In better water quality, green algae should be more competitive than diatoms, and a clear water color only appears when green algae dominate (occupying a larger proportion). Therefore, there is an urgent need to develop a method for regulating the algal community with diatoms as the dominant species. Summary of the Invention

[0003] To address the shortcomings of existing technologies, the present invention aims to provide a method for regulating algal communities dominated by diatoms, which can effectively improve water quality, regulate algal populations, shift the dominance of diatoms to green algae, eliminate water discoloration, and is easy to promote and use.

[0004] To achieve the above objectives, the present invention is implemented through the following technical solution: a method for adjusting an algal community dominated by diatoms, which is achieved through the following steps:

[0005] ① Flotation purification: The first section is set as the flotation purification zone. Flocculant is added at the inlet of the Qianhu regulating pond. The flocculant diffuses under the flushing of water, causing large impurities to initially settle. At the same time, an air flotation device is added under the first section to allow floatable impurities to float and be dewatered and removed by the screen.

[0006] ② Promote sedimentation and purification: Set up the second area as the sedimentation and purification zone, add flocculant, so that colloidal particles collide with each other and form flocculent coagulation and sedimentation;

[0007] ③ Set up an algal community adjustment zone to supplement carbon sources, enhance denitrification, and reduce total nitrogen;

[0008] ④ Set up an enhanced treatment zone and enhance water purification through floating island ecological walls.

[0009] Preferably, step ④ utilizes the ecological community on the floating island ecological wall, and uses planktonic microorganisms to absorb sewage and phytoplankton photosynthesis to achieve the effect of purifying the water.

[0010] Preferably, in step ③, the algal phase adjustment zone is equipped with a submerged ecological purification wall to enhance the competitiveness of green algae and inhibit the growth of diatoms.

[0011] Preferably, in step ①, polyaluminum chloride (PAC) and polyacrylamide (PAM) are added to the flocculation reaction tank via a dosing device for sedimentation. After solid-liquid separation in the air flotation reaction tank, the flotation impurities are dewatered and removed through a screen and sent to the slag storage tank, where they are discharged by a slag pump.

[0012] Preferably, step ② requires regular cleaning of the formed flocculent precipitate and sludge, and the sediment and sludge in the sedimentation tank are transferred to the sludge treatment point by the sludge discharge pump.

[0013] The beneficial effects of this invention are as follows: This invention uses diatoms as the dominant species and treats the water to inhibit the growth of diatoms, so that green algae gradually become the dominant species. This method can effectively improve water quality, regulate algae populations, and transform the dominance of diatoms into that of green algae, thereby eliminating water discoloration. It has broad application prospects. Attached Figure Description

[0014] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments;

[0015] Figure 1 This is a schematic diagram of the technical design of the present invention;

[0016] Figure 2 This is a schematic diagram of the process equipment layout for the present invention. Implementation

[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0018] Reference Figure 1-2 The specific implementation adopts the following technical solution: a method for adjusting the algal community dominated by diatoms, which is achieved through the following steps:

[0019] ① Flotation purification: Set the first section as flotation purification zone A. Add flocculant at the inlet of the Qianhu regulating pond. The flocculant diffuses under the flushing of water flow, causing large impurities to initially settle. At the same time, add air flotation device 1 under the first section to allow floatable impurities to float and be dewatered and removed by the screen 2.

[0020] ② Promote sedimentation and purification: Set the second area as the sedimentation and purification zone B, add flocculant, so that the colloidal particles collide with each other to form flocculent coagulation sedimentation 3;

[0021] ③ Set up algal phase regulation zone C to supplement carbon sources, enhance denitrification and reduce total nitrogen. This algal phase regulation zone enhances the competitiveness of green algae and inhibits the growth of diatoms by setting up a submerged ecological purification wall 5.

[0022] ④ Set up an enhanced treatment zone D, and enhance the purification of the water body through the floating island ecological wall 4. Utilize the ecological community on the floating island ecological wall 4, and use planktonic microorganisms to absorb sewage and the photosynthesis of phytoplankton to achieve the effect of purifying the water body.

[0023] It is worth noting that in step ①, the flocculant is added to the flocculation reaction tank 7 via the dosing device 6 for sedimentation. After solid-liquid separation in the air flotation reaction tank 8, the flotation impurities are dewatered and removed by the screen 2 and sent to the slag storage tank 9, and then discharged by the slag discharge pump 10.

[0024] This flocculant uses polyaluminum chloride (PAC) and polyacrylamide (PAM). PAC is used in the coagulation and flocculation processes of water treatment, exhibiting strong flocculation capabilities. It can form large and dense flocs in a short time, facilitating sedimentation and filtration, and effectively removing suspended solids, turbidity, and organic matter from water. PAM has excellent adsorption and sedimentation properties, adsorbing suspended and colloidal substances in water and causing them to aggregate into larger agglomerates. This promotes the rapid sedimentation of suspended and colloidal substances. It also possesses good stability, is not easily decomposed, and can adapt to different water quality variations within a certain range. The combined use of PAC and PAM improves water treatment effects, including flocculation, sedimentation, and purification. The two work synergistically to enhance treatment efficiency and can be used for treating various water qualities.

[0025] In addition, step ② requires the formation of flocculent precipitate 3 and sludge to be cleaned regularly, and the sediment and sludge in the sedimentation tank 11 are connected to the sludge treatment point by the sludge discharge pump 12.

[0026] This specific implementation method focuses on diatoms as the dominant species, inhibiting their growth through water treatment to allow green algae to gradually become the dominant population. The method employs flocculants for flotation and sedimentation purification, effectively removing various suspended solids and impurities, reducing turbidity, and improving water transparency. It also utilizes carbon source supplementation to regulate the algal community, promoting green algae growth and reproduction while reducing diatom numbers, thus achieving algal population regulation. Furthermore, the application of floating island ecological walls enhances water purification, effectively decomposing organic matter and nutrients, reducing eutrophication levels, and ultimately improving water quality.

[0027] This specific implementation method involves a series of steps including flotation, sedimentation, algal community adjustment, and enhanced treatment. On the one hand, it clarifies the formation mechanism and influencing factors of abnormal water color in the main stream of Qianhu Lake; on the other hand, it establishes an algal community adjustment ecological engineering project to in-situ dissolve pollutants, regulate the algal community, and improve water color. This method is suitable for water bodies with slow flow and severe accumulation of pollutants. It is also applicable to situations where silicon ions from soil erosion cause diatoms to become more competitive than green algae. It can effectively improve water quality, regulate algal populations, and shift the dominance of diatoms to green algae, thereby eliminating water color and has broad market application prospects.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A method for regulating an algal community dominated by diatoms, characterized in that, This can be achieved through the following steps: ① Flotation purification: Set the first section as the flotation purification zone (A). Add flocculant at the inlet of the Qianhu regulating pond to initially settle large impurities. At the same time, add an air flotation device (1) under the first section to allow floatable impurities to float and then be dewatered and removed by the screen (2). ②Promoting sedimentation and purification: Set the second area as the promoting sedimentation and purification zone (B), add flocculant to form flocculent coagulation sedimentation (3); ③ Set up an algal community adjustment zone (C) to supplement carbon sources, enhance denitrification, and reduce total nitrogen; ④ Set up an enhanced treatment zone (D) and enhance water purification through floating island ecological walls (4).

2. The method for adjusting an algal community dominated by diatoms according to claim 1, characterized in that, Step ④ utilizes the ecological community on the floating island ecological wall (4) to utilize planktonic microorganisms to absorb sewage and phytoplankton photosynthesis to purify the water.

3. The method for regulating an algal community dominated by diatoms according to claim 1, characterized in that, In step ③, the algal phase adjustment zone enhances the competitiveness of green algae and inhibits the growth of diatoms by setting up a submerged ecological purification wall (5).

4. The method for adjusting an algal community dominated by diatoms according to claim 1, characterized in that, In step ①, polyaluminum chloride (PAC) and polyacrylamide (PAM) are added to the flocculation reaction tank (7) via the dosing device (6) for precipitation. After solid-liquid separation in the air flotation reaction tank (8), the flotation impurities are dewatered and removed through the screen (2) to the slag storage tank (9), and then discharged by the slag discharge pump (10).

5. The method for adjusting an algal community dominated by diatoms according to claim 1, characterized in that, Step ② requires regular cleaning of the formed flocculent precipitate (3) and sludge, and the sediment and sludge in the sedimentation tank (11) are connected to the sludge treatment point by the sludge discharge pump (12).

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