In-situ algae control system for tail water receiving river channel of sewage plant
By combining chemical dosing, physical shading and aeration, ecological floating islands and light guiding technology into a multi-layered algae control system, the problem of rapid algae proliferation in the receiving river of sewage treatment plant effluent was solved, achieving water quality stability and ecosystem restoration.
Patent Information
- Application Number
- CN202423027760.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-09
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-09
AI Technical Summary
Existing technologies are insufficient to effectively control the growth of algae in the receiving rivers of sewage treatment plant effluent in the short term. Traditional methods are costly, difficult to maintain, and have a negative impact on the aquatic ecosystem.
An in-situ algae control system combining emergency dosing units, shading algae control units, ecological floating island units, and submerged plant units alters the algae's living environment and constructs a natural food chain through the addition of chemicals, physical shading and aeration, ecological floating islands, and light guiding technology.
It effectively controls algae growth, stabilizes water quality, enhances the water body's self-purification capacity, improves biodiversity, and rebuilds a healthy river ecosystem.
Smart Images
Figure CN223534949U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of ecological environment restoration technology, specifically to an in-situ algae control system for receiving rivers of sewage treatment plant effluent. Background Technology
[0002] Eutrophication-induced cyanobacterial blooms are a major global water environmental problem. During an cyanobacterial bloom, the massive accumulation of algae can severely impact the structure and function of aquatic ecosystems, leading to exceedances of pH, COD, and other pollutants, threatening water safety, and also affecting the surrounding environment.
[0003] The fundamental technology for controlling cyanobacterial blooms is to reduce nutrient load through comprehensive management, bringing nutrient levels to or below the concentration threshold that limits algal proliferation. However, in practice, the treatment of external pollution sources is extremely difficult, time-consuming, and yields limited results in the short term. Urban lakes and rivers are heavily impacted by human activities, resulting in high nutrient loads. Urban sewage channels, in particular, serve to receive, store, and discharge rainwater, sewage, and effluent. Even if sewage and effluent meet strict discharge standards, achieving the goal of controlling nutrient levels below the threshold is difficult to accomplish in the short term.
[0004] In response to the problems of eutrophication leading to aquatic habitat degradation and excessive algal blooms, in-situ algae control technology research has gained attention and is gradually being carried out. This type of technology directly implements algae control and removal in situ. From a technical perspective, these technologies focus on disrupting the growth environment conducive to algal proliferation, increasing water flow, and introducing biological species to regulate the aquatic ecosystem. Among the many environmental factors directly affecting algal proliferation, light is the easiest factor to intervene in, compared to temperature, nutrients, and pH. Traditional in-situ algae control technologies are mainly based on a single trophic level, and are limited by the size and depth of the water body, the control time, and seasonal changes. System maintenance is difficult and costly, and it cannot continuously and effectively control algal blooms. Furthermore, the destruction of the algal growth environment may also lead to the degradation of aquatic plants and a decline in biodiversity. Utility Model Content
[0005] This invention addresses the aforementioned shortcomings in the existing technology by providing an in-situ algae control system for wastewater treatment plant effluent receiving channels, used to control algae growth in wastewater treatment plant effluent receiving channels in situ and stabilize water quality.
[0006] According to one aspect of this utility model, an in-situ algae control system for receiving rivers of wastewater treatment plant effluent is provided, characterized in that it comprises: an emergency dosing unit, a light-shielding algae control unit, an ecological floating island unit, and a submerged plant unit arranged sequentially; wherein:
[0007] The emergency dosing unit is used to directly destroy cells and control algal biomass by adding agents;
[0008] The light-blocking algae control unit is used to directly inhibit the proliferation of harmful algae through physical light-blocking devices and oxygenation aeration equipment.
[0009] The ecological floating island unit is used to reduce nutrients in the water through the ecological floating island;
[0010] The submerged plant unit is used in conjunction with the ecological floating island unit to promote the establishment and survival of local submerged plant communities through light guiding technology.
[0011] Preferably, the emergency dosing unit is equipped with a dosing system, which includes a dosing tank and a dosing pipeline connected to each other, and fixed to supporting wooden stakes installed within the emergency dosing unit. More preferably, the emergency dosing unit is located 0.5–1 km from the wastewater treatment plant's effluent outlet; more preferably, the emergency dosing unit is activated when the chlorophyll concentration in the water exceeds 30 μg / L.
[0012] Preferably, the light-shielding algae control unit uses high-density polyethylene cloth or shade net with a thickness greater than 0.5 mm as a physical light-shielding device, with a coverage area of 80-90% of the controlled water area and a light-shielding rate of 70-95%, controlling the underwater light intensity to be lower than 1000 LX; underwater aeration pipes are installed as oxygenation and aeration equipment to control the underwater dissolved oxygen to be not lower than 5 mg / L; the hydraulic retention time of the light-shielding algae control unit is not less than 0.5 days.
[0013] Preferably, the ecological floating island unit is constructed using high-density polyethylene boards with a thickness of 2-5 cm to form emergent plant modules, creating a plant cover layer with a coverage rate of 50-80% in the controlled water area. The plant cover layer reduces nutrients in the water through assimilation. The hydraulic retention time of the ecological floating island unit is not less than 0.2 days.
[0014] Preferably, the submerged plant unit includes an underwater planting device and a light guiding device; wherein, the underwater planting device is used to construct local submerged plant modules underwater, and the light guiding device is used to promote the establishment and survival of the submerged plant module community; the hydraulic residence time of the submerged plant unit is not less than 0.2 days.
[0015] By adopting the above technical solution, this utility model has at least one of the following beneficial effects compared with the prior art:
[0016] This invention provides an in-situ algae control system for receiving rivers from wastewater treatment plants. By altering the living environment of algae in the water, it achieves algae control and water quality stabilization. Simultaneously, based on the principle of multi-trophic level regulation, engineering measures are used to create microhabitats, enhance the competitive effect among primary producers (algae and aquatic plants) and the downstream effect of primary consumers (zooplankton), thereby reconstructing the natural food chain and further controlling algal biomass in the water. Furthermore, it enhances the water body's self-purification capacity, increases biodiversity, and fosters a stable and healthy river ecosystem through the natural food chain.
[0017] The in-situ algae control system provided by this invention for receiving rivers of wastewater treatment plant effluent can destroy the growth environment conducive to algae proliferation and reconstruct the natural food chain, thereby controlling the algae biomass in the water body and promoting the enhancement of aquatic ecosystem biodiversity. Attached Figure Description
[0018] Other features, objects, and advantages of this invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:
[0019] Figure 1 This is a schematic diagram illustrating the working principle of an in-situ algae control system for a wastewater treatment plant effluent receiving river in a preferred embodiment of this utility model.
[0020] Figure 2 This is a schematic diagram of the in-situ algae control system for the receiving river of sewage treatment plant effluent in a preferred embodiment of the present invention. Detailed Implementation
[0021] The embodiments of this utility model are described in detail below: These embodiments are implemented based on the technical solution of this utility model, and provide detailed implementation methods and specific operation processes. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model.
[0022] Most existing technologies adopt a single-element, segmented treatment approach, choosing rapid and direct treatment methods while lacking subsequent engineering measures for ecological restoration. Therefore, it is difficult to guarantee the healthy and sustainable recovery of river ecosystems. To address this problem, one embodiment of this utility model provides an in-situ algae control system for receiving rivers carrying wastewater treatment plant effluent. This system combines traditional physical and chemical methods with aquatic ecological restoration, integrating the combined effects of aquatic animals, plants, and microorganisms to achieve a comprehensive algae control technology and process that integrates multiple processes for algae control and ecological restoration in urban sewage-receiving rivers.
[0023] Specifically, such as Figure 1As shown, the in-situ algae control system for the receiving river of wastewater treatment plant effluent provided in this embodiment may include: an emergency dosing unit, a shading algae control unit, an ecological floating island unit, and a submerged plant unit arranged in sequence; wherein:
[0024] The emergency dosing unit is used to directly destroy cells by adding chemicals to reduce algal biomass in order to deal with the abnormally rapid proliferation of algae;
[0025] The shading and algae control unit is used to directly inhibit the proliferation of harmful algae through physical shading devices and aeration equipment.
[0026] Ecological floating island units are used to reduce nutrients in the water through ecological floating islands;
[0027] Submerged plant units are used in conjunction with ecological floating island units to promote the establishment and survival of local submerged plant communities through light-guiding technology.
[0028] In some preferred embodiments, the emergency dosing unit is equipped with a dosing system, which includes a dosing tank and a dosing pipeline connected to each other and fixed to supporting wooden stakes installed within the emergency dosing unit.
[0029] In some preferred embodiments, the emergency dosing unit is located 0.5 to 1 kilometer from the wastewater treatment plant effluent outlet and is activated when the chlorophyll concentration in the water body is greater than 30 μg / L; the dosing agent is a chlorine-containing algaecide; the dosage of the dosing agent is 0.3 to 3 mg available chlorine / L / d.
[0030] In some preferred embodiments, the shading and algae control unit uses high-density polyethylene cloth or shade net with a thickness greater than 0.5 mm as a physical shading device, with a coverage area of 80-90% of the controlled water area and a shading rate of 70-95%, ensuring that the underwater light intensity is below 1000 LX; underwater aeration pipes are installed as oxygenation and aeration equipment to control the underwater dissolved oxygen to be not less than 5 mg / L; the hydraulic retention time of the shading and algae control unit is not less than 0.5 days.
[0031] In some preferred embodiments, the ecological floating island unit uses high-density polyethylene boards with a thickness of 2-5 cm to plant emergent plants to construct emergent plant modules, forming a plant cover layer with a coverage rate of 50-80% in the controlled water area, reducing the amount of nutrients in the water through the assimilation effect of the plant cover layer; the hydraulic residence time of the ecological floating island unit is not less than 0.2 days.
[0032] In some preferred embodiments, the emergent plant module adopts any one or any combination of emergent plants that are easy to grow, such as calamus, pickerelweed, water plantain, and sedge.
[0033] In some preferred embodiments, the submerged plant unit includes an underwater planting device and a light guiding device; wherein, the underwater planting device is used to plant local submerged plants underwater to construct submerged plant modules, and the light guiding device is used to promote the establishment and survival of the submerged plant module community; the hydraulic residence time of the submerged plant unit is not less than 0.2 days.
[0034] In some preferred embodiments, the light guiding device includes: a light-collecting dome, a light guide tube, a diffuser, a float, a sinker, and an illuminance meter; wherein:
[0035] The float is a flat plate with a density less than that of water, and at least one sinker with a density greater than that of water is connected to its bottom. The light guide device can be stabilized in the desired position by adjustment. The light guide tube is a cylindrical structure that can be adjusted in water depth and transmit sunlight. It is installed through the float. The top of the light guide tube is equipped with a light-collecting cover, and the bottom is equipped with a diffuser. The light-collecting cover is hemispherical and can collect and capture sunlight. The diffuser can evenly diffuse natural light underwater. The illuminance meter includes a digital display and a probe. The digital display is fixed on the float, and the probe is located on top of the submerged plants underwater. The digital display is used to display the underwater light intensity detected by the probe.
[0036] By adjusting the depth of the light guide tube in the water, the light intensity required for the growth of the submerged plant module can be met.
[0037] In some preferred embodiments, the submerged plant module adopts any one or any combination of several of the following: Myriophyllum spicatum, Ceratophyllum demersum, Vallisneria natans, Potamogeton crispus, etc.
[0038] The in-situ algae control system for wastewater treatment plant effluent receiving channels provided in the above embodiments of this utility model adopts a combination of methods. It uses low-dose chemical agents to inhibit abnormal algal proliferation and algal toxin release, reducing side effects and secondary risks. Through physical shading combined with flow generation and reoxygenation, it increases the fluidity and exchange of water in local areas, altering the living environment of algae and achieving algae control and water quality stability. Simultaneously, based on the principle of multi-trophic level regulation, it creates microhabitats through engineering measures, strengthening the competitive effect among primary producers and the downstream effect of primary consumers, reconstructing the natural food chain, and further controlling algal biomass in the water. This provides technical support for algae control and water quality stability in wastewater treatment plant effluent receiving channels.
[0039] The technical solution provided by the above embodiments of this utility model will be further described in detail below with reference to a specific application example.
[0040] This specific application example employs physical, chemical, and aquatic ecological restoration methods, combining chemical algae control technology, physical shading technology, flow-generating and reoxygenation technology, multifunctional ecological floating island technology, and artificial assisted restoration technology for submerged plant communities. By adding chlorine-containing algaecides to directly damage cells, algal biomass is reduced, thus addressing the abnormally rapid proliferation of algae. Physical shading systems and aeration methods directly inhibit the proliferation of harmful algae in the Suitang River. Ecological floating islands reduce nutrients in the water, and combined with light-guiding measures, promote the establishment and survival of local submerged plant communities, enhance the assimilation of nutrients by higher plants, reduce water disturbance and sediment mixing, and reduce the release of endogenous nutrients, thereby reducing the acquisition of nutrients by algae. Simultaneously, it provides shelter for zooplankton, reduces fish predation on zooplankton, increases zooplankton density and biodiversity, thereby increasing the feeding pressure of zooplankton on algae, forming a complex ecosystem with a complex food chain structure, and ultimately controlling algal blooms.
[0041] like Figure 2 As shown, this specific application example utilizes an in-situ algae control system for a wastewater treatment plant's effluent receiving channel. The system targets an artificial channel approximately 5 kilometers long with an effective storage capacity of 290,000 cubic meters and a hydraulic retention time of about 3 days. This channel primarily receives treated wastewater from a petrochemical company, wastewater treatment plant effluent, and some rainwater. Although all discharge outlets strictly adhere to standards, during the high-temperature summer season, under suitable light, temperature, and nutrient conditions, abnormal algal proliferation occurs in the channel, sometimes leading to algal blooms and exceeding pH and COD limits. The system includes: an emergency chemical dosing unit, a shading algae control unit, an ecological floating island unit, and a submerged plant unit. After entering the receiving channel, the wastewater first enters the emergency chemical dosing unit, then the shading algae control unit, and finally the ecological floating island unit and the submerged plant unit. The construction of each treatment unit is as follows:
[0042] The emergency dosing unit, equipped with a dosing system consisting of a dosing tank and dosing pipelines, is fixed to supporting wooden stakes within the unit; it is located 0.6 kilometers from the wastewater treatment plant's effluent outlet. It is activated when the chlorophyll concentration in the water exceeds 50 μg / L; the dosing agent is a chlorine-containing algaecide; the dosage is 0.3–2.0 mg available chlorine / L.
[0043] The shading and algae control unit is located approximately 1.3 kilometers from the sewage outlet, with a length of about 0.7 kilometers and a hydraulic retention time of about 0.5 days. It uses high-density polyethylene cloth or shade netting with a thickness greater than 0.5 mm, covering 80% of the shading and algae control unit area, achieving a shading rate of 90%. The underwater illumination is 40–300 LX. Underwater aeration pipes are installed to create flow and reoxygenate, increasing the fluidity and exchange of the local water body, ensuring that the underwater dissolved oxygen is not lower than 5–9 mg / L.
[0044] The ecological floating island unit is approximately 0.2 kilometers long, with a hydraulic residence time of about 0.2 days. The floating islands are deployed on the water surface, achieving a coverage rate of 70%. The floating islands are constructed using 5cm thick high-density polyethylene sheets; the vegetation consists of emergent plants such as calamus and sedge.
[0045] The submerged plant unit is approximately 0.35 kilometers long, with a hydraulic residence time of about 0.3 days. Underwater cauda algae are cultivated, and a light-guiding device is installed to promote the establishment and survival of the submerged plant community.
[0046] Before the construction of the aforementioned in-situ algae control system, the peak chlorophyll concentration at the main discharge outlet of the river reached 100 μg / L, and the pH exceeded 9. The in-situ algae control system began operation in May, with a temperature of 25-28℃. The chlorophyll concentration at the wastewater discharge outlet was 6 μg / L, the total nitrogen concentration in the water was 8.5 mg / L, and the total phosphorus concentration was 0.1 mg / L. Emergency chemical dosing was not activated. The chlorophyll concentrations at the influent and effluent of the shading algae control unit, the effluent of the ecological floating island unit, the effluent of the submerged plant unit, and the main discharge outlet of the river were 41, 18, 12, 9.5, and 17 μg / L, respectively.
[0047] In July, the temperature was 31-33℃. The chlorophyll concentration at the sewage outlet was 10μg / L, the total nitrogen concentration in the water was 7.0mg / L, and the total phosphorus concentration was 0.1mg / L. Emergency dosing was not activated. The chlorophyll concentrations at the inlet and outlet of the shading algae control unit, the outlet of the ecological floating island unit, the outlet of the submerged plant unit, and the total outlet of the river were 60, 27, 18, 14.5, and 25μg / L, respectively.
[0048] In August, the temperature was 32-34℃. The chlorophyll concentration at the sewage outlet was 52μg / L, the total nitrogen concentration in the water was 9.0mg / L, and the total phosphorus concentration was 0.1mg / L. Emergency dosing was activated, with a dosage of 1.0mg available chlorine / L / d. The chlorophyll concentrations at the inlet and outlet of the shading algae control unit, the outlet of the ecological floating island unit, the outlet of the submerged plant unit, and the total river outlet were 35, 16, 10.5, 8.4, and 15μg / L, respectively.
[0049] As demonstrated by the specific application examples above, the in-situ algae control system provided in the embodiments of this invention effectively alters the living environment of algae in the water, achieving the goals of algae control and water quality stabilization. Simultaneously, based on the principle of multi-trophic level regulation, engineering measures create microhabitats, strengthen the competitive effect among primary producers (algae and aquatic plants) and the downstream effect of primary consumers (zooplankton), reconstructing the natural food chain and further controlling algal biomass in the water. Furthermore, this structure enhances the self-purification capacity of the water body, increases biodiversity, and forms a stable and healthy river ecosystem through the natural food chain.
[0050] The in-situ algae control system for receiving rivers of wastewater treatment plant effluent provided in the above embodiments of this utility model achieves the purpose of algae control and water quality stabilization by changing the living environment of algae in the water. Simultaneously, based on the principle of multi-trophic level regulation, through engineering measures, it creates microhabitats, strengthens the competitive effect among primary producers (algae and aquatic plants) and the downstream effect of primary consumers (zooplankton), reconstructs the natural food chain, and further controls the algal biomass in the water. It also enhances the self-purification capacity of the water body, increases biodiversity, and forms a stable and healthy river ecosystem through the natural food chain; it can destroy the growth environment conducive to algal proliferation and reconstruct the natural food chain, thereby controlling the algal biomass in the water and promoting the enhancement of aquatic ecosystem biodiversity.
[0051] Any matters not covered in the above embodiments of this utility model are known in the art.
[0052] The specific embodiments of this utility model have been described above. It should be understood that this utility model is not limited to the specific embodiments described above, and those skilled in the art can make various modifications or variations within the scope of the claims, which do not affect the substantive content of this utility model.
Claims
1. An in-situ algae control system for receiving rivers of wastewater treatment plant effluent, characterized in that, include: The emergency dosing unit, the light-shading algae control unit, the ecological floating island unit, and the submerged plant unit are arranged sequentially; among them: The emergency dosing unit is used to directly destroy cells by adding agents, thereby controlling algal biomass; The light-blocking algae control unit is used to directly inhibit the proliferation of harmful algae through physical light-blocking devices and oxygenation aeration equipment. The ecological floating island unit is used to reduce nutrients in the water through the ecological floating island; The submerged plant unit is used in conjunction with the ecological floating island unit to promote the establishment and survival of local submerged plant communities through light guiding.
2. The in-situ algae control system for receiving rivers of wastewater treatment plant effluent according to claim 1, characterized in that, The emergency dosing unit is equipped with a dosing system, which includes a dosing tank and a dosing pipeline that are connected to each other and are respectively fixed to the supporting wooden stakes set in the emergency dosing unit.
3. The in-situ algae control system for receiving rivers of wastewater treatment plant effluent according to claim 2, characterized in that, It also includes any one or more of the following: - The emergency dosing unit is located 0.5 to 1 kilometer from the wastewater treatment plant's effluent outlet; -The emergency dosing unit is activated when the chlorophyll concentration in the water body is greater than 30 μg / L; -The added agent is a chlorine-containing algaecide; - The dosage of the added agent is 0.3 to 3 mg available chlorine / L / d.
4. The in-situ algae control system for receiving rivers of wastewater treatment plant effluent according to claim 1, characterized in that, The light-shading and algae control unit uses high-density polyethylene cloth or shade net with a thickness greater than 0.5 mm as a physical light-shading device, with a coverage area of 80-90% of the controlled water area and a light-shading rate of 70-95%, controlling the underwater light intensity to be below 1000 LX; underwater aeration pipes are installed as oxygenation and aeration equipment to control the underwater dissolved oxygen to be not less than 5 mg / L; the hydraulic retention time of the light-shading and algae control unit is not less than 0.5 days.
5. The in-situ algae control system for receiving rivers of wastewater treatment plant effluent according to claim 1, characterized in that, The ecological floating island unit is constructed using high-density polyethylene boards with a thickness of 2-5 cm to create emergent plant modules, forming a plant cover layer with a coverage rate of 50-80% in the controlled water area. The plant cover layer reduces nutrients in the water through assimilation. The hydraulic retention time of the ecological floating island unit is not less than 0.2 days.
6. The in-situ algae control system for receiving rivers of wastewater treatment plant effluent according to claim 5, characterized in that, The emergent plant module uses any one or any combination of calamus, pickerelweed, alisma, and sedge.
7. The in-situ algae control system for receiving rivers of wastewater treatment plant effluent according to claim 1, characterized in that, The submerged plant unit includes an underwater planting device and a light guiding device; wherein, the underwater planting device is used to construct local submerged plant modules underwater, and the light guiding device is used to promote the establishment and survival of the submerged plant module community; the hydraulic residence time of the submerged plant unit is not less than 0.2 days.
8. The in-situ algae control system for receiving rivers of wastewater treatment plant effluent according to claim 7, characterized in that, The light guiding device includes: a light-collecting cover, a light guide tube, a diffuser, a float, a sinker, and an illuminance meter; wherein: the float is a flat plate with a density less than that of water, and at least one sinker with a density greater than that of water is connected to its bottom; the light guide tube is a cylindrical structure and is disposed through the float; the light-collecting cover is disposed at the top end of the light guide tube, and the diffuser is disposed at the bottom end of the light guide tube; the illuminance meter is fixed to the float.
9. The in-situ algae control system for receiving rivers of wastewater treatment plant effluent according to claim 7, characterized in that, The submerged plant module uses any one or any combination of several of the following: Myriophyllum spicatum, Ceratophyllum demersum, Vallisneria natans, and Potamogeton crispus.