A multi-stage sewage treatment device for particulate microalgae
By designing a multi-stage wastewater treatment device using granular microalgae, nitrogen and phosphorus removal are achieved through the self-reproduction of microalgae, eliminating the need for aeration devices. This solves the problems of high investment and high energy consumption in rural wastewater treatment and provides an efficient and low-cost wastewater purification solution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NANCHANG HANGKONG UNIVERSITY
- Filing Date
- 2024-12-20
- Publication Date
- 2026-06-02
AI Technical Summary
Existing rural domestic sewage treatment technologies suffer from high investment costs, complex operation, high energy consumption, and the need for professional maintenance. In particular, granular microalgae reaction tanks require aeration devices and are inconvenient to maintain, making them unsuitable for simple rural treatment.
Design a multi-stage wastewater treatment device for granular microalgae. It uses three microalgae reaction tanks to achieve nitrogen and phosphorus removal by the self-reproduction of microalgae under light. The aeration device is omitted, and a sieve plate gasket is used to prevent microalgae loss. Acrylic material is used to reduce cost and energy consumption.
It achieves efficient purification of rural sewage, reduces energy consumption, simplifies equipment structure, reduces land occupation and construction costs, and is suitable for independent households in rural areas and on the outskirts of cities. The microalgae can be utilized as a resource.
Smart Images
Figure CN224313348U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater treatment equipment, and in particular to a multi-stage wastewater treatment device for granular microalgae. Background Technology
[0002] Rural domestic sewage generally refers to pollution such as domestic sewage, domestic garbage, exhaust gas, and human (animal) excrement generated in the daily life of rural residents or in activities that provide services for their daily life.
[0003] Currently, most rural areas in China typically use biological treatment methods centered on microorganisms to treat domestic sewage, such as biofilm processes and activated sludge processes. However, these methods have some limitations in rural sewage treatment. For example, activated sludge processes have high investment costs, complex operating technologies, require professional management and maintenance, and generate sludge that can cause secondary pollution. Emission reduction and carbon sequestration are currently hot topics, and rural sewage treatment, as an important measure to improve the rural ecological environment, is closely linked to emission reduction and carbon sequestration.
[0004] Although the energy consumption of the wastewater treatment industry is not as high as that of industries such as power generation, steel, and chemicals, it still accounts for a significant portion of total energy consumption and is considered a major energy consumer. Reducing carbon emissions and lowering energy consumption in wastewater treatment is an inevitable goal for the environmental protection industry. Granular microalgae, used in wastewater treatment, represents a natural ecological approach to wastewater treatment. It boasts advantages such as simple equipment structure, low investment costs, and easy operation. However, the maintenance and survival of granular microalgae require light and oxygen. Chinese patent "Particle Microalgae Continuous Circulation Reactor" (ZL2021220882058) discloses a reactor that uses staggered guide plates to divide the reactor body into interconnected unit tanks. Wastewater flows in a serpentine pattern through the space created by the guide plates. A microporous aeration device is placed at the bottom of the middle unit tank, serving as an aeration tank. In the two unit tanks on either side, a horizontal sedimentation method is used. Finally, the wastewater enters the overflow tank through the overflow hole and is discharged from the outlet. Although the structure of the reaction tank is simple, it still requires the installation of an aeration device, resulting in low wastewater treatment efficiency. It also requires professional personnel to operate, and the aeration device is installed at the bottom of the reaction tank, making maintenance inconvenient and unsuitable for simple rural sewage treatment. Utility Model Content
[0005] The purpose of this invention is to provide a multi-stage wastewater treatment device using granular microalgae. Under sunlight, this device achieves nitrogen and phosphorus removal from wastewater through the self-reproduction of microalgae. The treated wastewater is then discharged through pipes after passing through three microalgae reaction tanks with varying elevations. This design achieves highly efficient purification of rural wastewater while reducing energy consumption. The invention features a simple structure and a compact integrated system, saving on land area and construction costs.
[0006] A multi-stage wastewater treatment device for granular microalgae includes a sedimentation tank, a lift pump, pipelines, and a microalgae reaction tank. The microalgae reaction tank comprises reaction tanks A, B, and C, each containing microalgae, connected vertically in series via a connecting pipeline. The upper part of the sedimentation tank is connected to the upper inlet of reaction tank A via a lift pipeline. A lift pump is fixedly connected to the lift pipeline. The inlets and outlets of reaction tanks A, B, and C are connected to the connecting pipeline via flanges, and the gasket between the two flanges is a sieve plate gasket.
[0007] The connecting pipe is equipped with flange connections near the inlet and / or outlet, and the gasket between the two flanges is a sieve plate gasket.
[0008] To prevent the loss of microalgae, the sieve plate of the sieve plate gasket has a sieve plate aperture of 0.1 mm.
[0009] The connecting pipes include pipe I connecting the upper outlet of reaction tank A and the lower inlet of reaction tank B, and pipe II connecting the upper outlet of reaction tank B and the upper inlet of reaction tank C. The outlet of reaction tank C is located at the lower part or bottom of reaction tank C.
[0010] The outlet of reaction tank A is located on the left and the inlet is located on the right; the outlet of reaction tank B is located on the right and the inlet is located on the left; the outlet of reaction tank C is located on the left and the inlet is located on the right.
[0011] Overflow pools are provided on the left and right sides of the reaction pools A, B, and C, with the inlet and outlet located on the outer wall of the overflow pools.
[0012] The connecting pipe is a straight pipe, which is composed of several straight pipes connected in a detachable and sealed manner.
[0013] The connecting pipe is a three-dimensional spiral pipe, which is composed of several arc-shaped pipes that are detachably and sealed together.
[0014] The detachable sealing connection is equipped with a sieve-type gasket.
[0015] The connecting pipe is a transparent circular acrylic pipe, and the reaction tanks A, B, and C are made of transparent acrylic material.
[0016] This application utilizes three vertically connected reaction tanks, generating foam gas through the natural cascading of water, thus eliminating the need for an aeration device and saving on equipment and labor maintenance costs. To prevent microalgae from being lost with the wastewater, sieve-plate gaskets are used to maintain the microalgae content in each reaction tank.
[0017] Compared with traditional rural domestic sewage treatment devices, this utility model device adopts the principle of microalgae's own nitrogen and phosphorus removal. After treatment in three microalgae reaction tanks, the effluent is discharged through pipelines, making it suitable for treating rural domestic sewage. Algae are placed in the microalgae reaction tanks, and the rural domestic sewage network is connected to this utility model device. The effluent from the rural sewage collection pipeline undergoes mud-water separation in a sedimentation tank. The supernatant from the sedimentation tank is pumped to microalgae reaction tank A by a lift pump. Under the action of light, the microalgae reproduce, achieving nitrogen and phosphorus removal from the sewage. After treatment in the three microalgae reaction tanks A, B, and C, the effluent is discharged through the outlet, thus achieving sewage purification.
[0018] This utility model device uses microalgae particles, and the pipe has detachable port screen plates at both ends to prevent microalgae from entering the water and causing additional load. The use of microalgae particles is also beneficial for subsequent cleaning. The proliferated microalgae particles can be processed into feed or fertilizer, thereby maximizing the utilization of resources.
[0019] The main component of this device is made of acrylic, which is low in cost, highly corrosion-resistant, and has a long service life. The device has a simple structure, low investment cost, and low energy consumption. This device achieves nitrogen and phosphorus removal from wastewater through the self-propagation of microalgae. After treatment in three microalgae reaction tanks, the effluent is discharged through pipelines, providing a new approach to the efficient purification of rural domestic wastewater.
[0020] This device is suitable not only for rural areas, but also for independent households scattered on the outskirts of cities. Attached Figure Description
[0021] Figure 1 This is a front view schematic diagram of the device of this utility model.
[0022] Figure 2 for Figure 1 Schematic diagram of part I in the middle,
[0023] Figure 3 This is a front view schematic diagram of the sieve plate gasket in the device of this utility model.
[0024] The labels in the diagram are as follows: 1-Reaction tank A, 2-Connecting pipe I, 3-Reaction tank B, 4-Reaction tank C, 5-Outlet, 6-Overflow tank, 7-Lifting pipe, 8-Connecting pipe II, 9-Sedimentation tank, 10-Lifting pump, 11-Flange, 12-Sieve plate gasket. Detailed Implementation
[0025] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.
[0026] like Figure 1-3As shown, this utility model discloses a multi-stage rural sewage treatment device for granular microalgae, comprising a sedimentation tank 9, a lift pump 10, pipelines, and a microalgae reaction tank. The microalgae reaction tank comprises three reaction tanks (A1, B3, and C4) vertically connected in series via a connecting pipeline. The upper part of the sedimentation tank 9 is connected to the upper right inlet of reaction tank A1 via a lift pipeline 7. A lift pump 10 is fixedly connected to the lift pipeline 7. The inlets and outlets of reaction tanks A1, B3, and C4 are connected to the connecting pipeline via flanges 11, and the gasket between the two flanges 11 is a sieve plate gasket 12.
[0027] Overflow tanks 6 are provided on the left and right sides of reaction tanks A, B, and C, with inlets and outlets located on the outer walls of the overflow tanks 6. The connecting pipes include pipe I2 connecting pipe between the outlet on the upper left side of reaction tank A1 and the inlet on the lower left side of reaction tank B3, and pipe II8 connecting pipe II8 connecting the outlet on the upper right side of reaction tank B3 and the inlet on the upper right side of reaction tank C4. The outlet 5 of reaction tank C4 is located on the lower left side of reaction tank C4, and the entire device discharges the treated wastewater through outlet 5.
[0028] Preferably, the connecting pipe may be equipped with flange connections near the inlet and / or outlet, and the gaskets between the flanges are sieve-type gaskets to increase the probability of intercepting microalgae. To prevent microalgae loss, the sieve plate aperture of the sieve-type gasket is 0.1mm.
[0029] Acrylic material is preferred for connecting pipes and microalgae reaction tanks to increase the amount of light reaching the microalgae. At the same time, the connecting pipes can be of various shapes, such as straight or spiral, to increase the pipe length. The detachable sealing connection can also be equipped with sieve-type gaskets to control the loss of microalgae in multiple stages and to facilitate the cleaning of retained microalgae.
[0030] Sedimentation tank 9 is connected to the effluent pipe of the rural domestic sewage network and is connected to reaction tank A1 via lift pipe 7 and lift pump 10. Reaction tank A1 contains microalgae particles. The overflow tanks 6 on the left and right sides of microalgae reaction tank A1 are used to make the effluent more uniform and to a certain extent to prevent particulate algae from entering the treated water. The treated sewage is connected to reaction tank B3 via connecting pipe I2. Reaction tank B3 contains microalgae particles and is also equipped with overflow tanks 6 on the left and right sides, and is connected to reaction tank C4 via connecting pipe II8. The outlet 5 of reaction tank C discharges the treated sewage.
[0031] The treatment process for rural domestic sewage in the aforementioned sewage treatment device is as follows: Sewage passes through sedimentation tank 9 for sludge-water separation. The supernatant from the sedimentation tank is then pumped by lift pump 10 to microalgae reaction tank A1. Microalgae use nitrogen and phosphorus from the sewage as nutrients to complete their life activities, achieving the removal of nitrogen, phosphorus, and some organic pollutants from the water. The treated sewage then enters microalgae reaction tank B3, where microalgae further remove nitrogen, phosphorus, and some organic pollutants. Finally, the treated sewage enters microalgae reaction tank C4, and the effluent from microalgae reaction tank C4 ultimately meets discharge standards.
[0032] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0033] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.
Claims
1. A multi-stage wastewater treatment device for granular microalgae, comprising a sedimentation tank, a booster pump, pipelines, and a microalgae reaction tank, characterized in that: The microalgae reaction tank includes reaction tank A, reaction tank B, and reaction tank C, which are vertically connected in series via a connecting pipe. The upper part of the sedimentation tank is connected to the upper inlet of reaction tank A via a lifting pipe. A lifting pump is fixedly connected to the lifting pipe. The inlets and outlets of reaction tanks A, B, and C are connected to the connecting pipe via flanges. The gasket between the two flanges is a sieve plate gasket.
2. The granular microalgae multi-stage wastewater treatment device according to claim 1, characterized in that: The connecting pipe is equipped with flange connections near the inlet and / or outlet, and the gasket between the two flanges is a sieve plate gasket.
3. The granular microalgae multi-stage wastewater treatment device according to claim 1, characterized in that: The aperture of the sieve plate of the sieve plate gasket is 0.1 mm.
4. The granular microalgae multi-stage wastewater treatment device according to claim 1, characterized in that: The connecting pipes include pipe I connecting the upper outlet of reaction tank A and the lower inlet of reaction tank B, and pipe II connecting the upper outlet of reaction tank B and the upper inlet of reaction tank C. The outlet of reaction tank C is located at the lower part or bottom of reaction tank C.
5. The granular microalgae multi-stage wastewater treatment device according to claim 4, characterized in that: The outlet of reaction tank A is located on the left and the inlet is located on the right; the outlet of reaction tank B is located on the right and the inlet is located on the left; the outlet of reaction tank C is located on the left and the inlet is located on the right.
6. The granular microalgae multi-stage wastewater treatment device according to claim 5, characterized in that: Overflow pools are provided on the left and right sides of the reaction pools A, B, and C, with the inlet and outlet located on the outer wall of the overflow pools.
7. The granular microalgae multi-stage wastewater treatment device according to claim 1, characterized in that: The connecting pipe is a straight pipe, which is composed of several straight pipes connected in a detachable and sealed manner.
8. The granular microalgae multi-stage wastewater treatment device according to claim 1, characterized in that: The connecting pipe is a three-dimensional spiral pipe, which is composed of several arc-shaped pipes that are detachably and sealed together.
9. The granular microalgae multi-stage wastewater treatment device according to claim 7 or 8, characterized in that: The detachable sealing connection is equipped with a sieve-type gasket.
10. The granular microalgae multi-stage wastewater treatment device according to claim 1, characterized in that: The connecting pipe is a transparent circular acrylic pipe, and the reaction tanks A, B, and C are made of transparent acrylic material.