Sewage treatment equipment based on straw purification

Abstract

The invention provides sewage treatment equipment based on straw purification, and relates to the technical field of sewage treatment.The sewage treatment equipment comprises a collection primary screening pond, a straw water purification pond and a wetland adjusting pond, the collection primary screening pond comprises a collection primary screening pond, and the straw water purification pond comprises a first straw pond, an activated sludge pond and a second straw pond; the wetland adjusting tank comprises a wetland adjusting tank body, a first connecting pipe is fixedly installed between the collection primary screening tank and the straw water purifying tank, a third connecting pipe is fixedly installed between the straw water purifying tank and the wetland adjusting tank body, and electromagnetic valves are fixedly installed on the first connecting pipe and the third connecting pipe; the straw which is originally used as solid waste is applied to sewage treatment, and resource utilization of the straw is realized by utilizing the characteristic that the straw adsorbs N and P elements in sewage. The treated straw can also be used as fertilizer to be returned to the field, so that the returning time is shortened, the carbon emission and the chemical fertilizer use amount are reduced, the comprehensive utilization rate of the straw is improved, and the comprehensive utilization process of the straw is promoted.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and more specifically, relates to sewage treatment equipment based on straw purification. Background Art

[0002] Due to economic constraints, rural sewage treatment infrastructure is lacking, resulting in low treatment capacity. Low-cost, adaptable sewage treatment methods are urgently needed. Although some researchers have found that straw can adsorb elements such as nitrogen and phosphorus, such as Lu Wenlong's research demonstrating straw's adsorption properties for nitrogen and phosphorus in soil, and Ussiri et al.'s study of the adsorption of ammonium nitrogen in aqueous solutions by four types of straw, mature straw-based sewage treatment equipment is still not widely used in rural areas. The challenges of rural sewage treatment and the comprehensive utilization of straw remain pressing. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a sewage treatment equipment based on straw purification to solve the above problems.

[0004] A sewage treatment equipment based on straw purification includes a collecting and screening pool, a straw water purification pool and a wetland regulating pool, wherein the collecting and screening pool includes a collecting and screening pool, the straw water purification pool includes a first straw pool, an activated sludge pool and a second straw pool, the wetland regulating pool includes a wetland regulating pool, a first connecting pipe is fixedly installed between the collecting and screening pool and the straw water purification pool, a third connecting pipe is fixedly installed between the straw water purification pool and the wetland regulating pool, electromagnetic valves are fixedly installed on the first connecting pipe and the third connecting pipe, and a filter is fixedly installed inside the end of the third connecting pipe, and the electromagnetic valve is used to control the time that sewage stays in different pools.

[0005] Preferably, a sewage inlet pipe is fixedly installed at the initial end of the collection and primary screening pool, and a filter screen is installed in the end of the first connecting pipe located inside the collection and primary screening pool for removing larger debris and performing preliminary sedimentation. The filter screen can be set in the abandoned corner of each household and managed by each household. This solves the land occupation problem while reducing management pressure. The first straw pool and the second straw pool both include a permeable screen frame. Straw and activated sludge are placed in the permeable screen frame. The activated sludge pool is located between the first straw pool and the second straw pool, and the activated sludge pool is located at the bottom of the straw water purification pool. The first straw pool and the activated sludge pool are convenient for replacing straw. The sewage flowing into the primary screening pool is absorbed by the straw to absorb part of the N and P elements, reducing the water quality fluctuation range to ensure the water purification effect of the activated sludge, and removing smaller debris at the same time. The activated sludge pool is provided with a biofilm and an aeration pipe to ensure that the activated sludge can adsorb N and P elements, remove pathogens and other pathogenic bacteria, and then flow into the second straw pool for secondary straw adsorption to prevent water quality fluctuations from affecting the water purification effect of the artificial wetland.

[0006] A second connecting pipe is fixedly installed between each of the first straw pool, the activated sludge pool and the second straw pool, and each second connecting pipe is provided with a solenoid valve. The pools are connected with pipes and solenoid valves to ensure sufficient reaction time, so that the treatment effect is guaranteed to a certain extent. The straw originally used as solid waste is fully utilized in sewage treatment, and the replaced straw is returned to the field as fertilizer after simple treatment, which shortens the time required for returning to the field, reduces carbon emissions and the use of chemical fertilizers, and improves the comprehensive utilization rate of straw. The biofilm is located inside the aeration pipe, and a blower is fixedly installed at the end of the aeration pipe, and an electric wire is installed on the outside of the blower.

[0007] Preferably, the wetland conditioning pond reprocesses wastewater through aquatic plant purification, microbial decomposition, and matrix filtration to achieve excellent treatment and ecological benefits. Furthermore, the wetland conditioning pond can be used for aquaculture, beautifying the rural environment and increasing farmers' income. It also helps accelerate the establishment of a green, low-carbon, circular economic system and promotes a comprehensive green transformation of economic and social development.

[0008] Compared with the prior art, the present invention has the following beneficial effects: Comprehensive Utilization of Straw Resources: Straw, once considered solid waste, is used in sewage treatment, leveraging its ability to absorb nitrogen and phosphorus from wastewater, realizing its resourceful utilization. Treated straw can also be returned to farmland as fertilizer, shortening return time, reducing carbon emissions and fertilizer usage, and increasing its comprehensive utilization rate, thereby advancing its overall utilization.

[0009] Reduced sewage treatment costs: The equipment's infrastructure is primarily constructed using locally sourced materials, such as abandoned rivers and earth pits, which reduces construction costs. Furthermore, the decentralized approach to sewage treatment simplifies the treatment process and reduces operating costs, aligning with the current weak rural economic foundation and facilitating future expansion and application.

[0010] Improving sewage treatment capacity: Through the synergistic effects of a collection and screening tank, a straw-based water purification tank, and a wetland conditioning tank, sewage is treated in multiple stages. The collection and screening tank removes bulky debris and initial sedimentation. The straw-based water purification tank uses straw and activated sludge to absorb nitrogen and phosphorus and remove pathogens. The wetland conditioning tank further purifies sewage through aquatic plants, microorganisms, and substrates. This improves sewage treatment efficiency and meets rural sewage treatment needs.

[0011] Protecting the ecological environment: This reduces air pollution and greenhouse gas emissions from straw burning, while also reducing water resource pollution caused by eutrophication due to fertilizer runoff. Wetland regulation ponds are used to plant aquatic plants and develop aquaculture, beautifying the rural environment and improving human comfort, contributing to the establishment of a green, low-carbon, circular economic system.

[0012] Easy to manage and maintain: The collection and screening pool can be set up in each household's waste corner and managed by each household, reducing management pressure. The overall equipment has a simple structure, a clear processing flow, and low operation and management difficulty. It is suitable for the current situation of low operation and management level in rural areas and facilitates subsequent maintenance.

[0013] Increase farmers' income: Wetland regulation ponds can be used for aquaculture, providing farmers with an additional source of income, while solving sewage treatment problems and promoting rural economic development. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a left view of the overall structure of the present invention; Figure 3 It is a top view of the overall structure of the present invention; Figure 4 It is a line graph of the adsorption rate of N and P elements on straw.

[0015] In the figure, the correspondence between the component names and the drawing numbers is: 1. Sewage inlet pipe; 11. Collection and primary screening tank; 12. First connecting pipe; 13. Electric wire; 14. Blower; 15. First straw tank; 16. Activated sludge tank; 17. Second straw tank; 18. Second connecting pipe; 19. Permeable screen frame; 2. Third connecting pipe; 21. Wetland regulation tank. DETAILED DESCRIPTION

[0016] The following embodiments of the present invention are described in further detail with reference to the accompanying drawings and examples. The following examples are used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0017] See also Figures 1-4 The present invention provides a sewage treatment equipment based on straw purification, including a collecting primary screening pool, a straw water purification pool and a wetland regulating pool 21, the collecting primary screening pool includes a collecting primary screening pool 11, the straw water purification pool includes a first straw pool 15, an activated sludge pool 16 and a second straw pool 17, the wetland regulating pool 21 includes a wetland regulating pool 21, a first connecting pipe 12 is fixedly installed between the collecting primary screening pool and the straw water purification pool, a third connecting pipe 2 is fixedly installed between the straw water purification pool and the wetland regulating pool 21, electromagnetic valves are fixedly installed on the first connecting pipe 12 and the third connecting pipe 2, and a filter is fixedly installed inside the end of the third connecting pipe 2, and the electromagnetic valve is used to control the time that sewage stays in different pools.

[0018] The initial end of the collecting primary screening pool 11 is fixedly installed with a sewage inlet pipe 1, and the end of the first connecting pipe 12 inside the collecting primary screening pool 11 is installed with a filter screen 1 for removing larger debris and performing preliminary sedimentation. It can be set in the abandoned corner of each household and managed by each household, which solves the land occupation problem while reducing management pressure. The first straw pool 15 and the second straw pool 17 both include a permeable screen frame 19, in which straw and activated sludge are placed. The activated sludge pool 16 is located between the first straw pool 15 and the second straw pool 17, and the activated sludge pool 16 is located at the bottom of the straw water purification pool. The first straw pool 15 and the activated sludge pool 16 are convenient for replacing straw. The sewage flowing into the primary screening pool is absorbed by the straw to absorb part of the N and P elements, reducing the water quality fluctuation range to ensure the water purification effect of the activated sludge, and removing smaller debris at the same time. The activated sludge pool 16 is provided with a biofilm and an aeration pipe to ensure that the activated sludge can adsorb N and P elements, remove pathogens and other pathogenic bacteria, and then flow into the second straw pool 17 for secondary straw adsorption to prevent water quality fluctuations from affecting the water purification effect of the artificial wetland.

[0019] A second connecting pipe 18 is fixedly installed between each of the first straw pool 15, the activated sludge pool 16 and the second straw pool 17, and each second connecting pipe 18 is provided with a solenoid valve. The pools are connected by pipes and solenoid valves to ensure sufficient reaction time, so that the treatment effect is guaranteed to a certain extent. The straw that was originally used as solid waste is fully utilized in sewage treatment. The replaced straw is returned to the field as fertilizer after simple treatment, which shortens the time required for returning to the field, reduces carbon emissions and the use of chemical fertilizers, and improves the comprehensive utilization rate of straw. The biofilm is located inside the aeration pipe, and a blower 14 is fixedly installed at the end of the aeration pipe. An electric wire 13 is installed outside the blower 14.

[0020] Wetland regulation ponds reprocess wastewater through aquatic plant purification, microbial decomposition, and matrix filtration, achieving excellent treatment results and ecological benefits. Furthermore, wetland regulation ponds can be used for aquaculture, beautifying the rural environment and increasing farmers' incomes. They also help accelerate the establishment of a green, low-carbon, circular economic system and promote a comprehensive green transformation of economic and social development.

[0021] Wastewater first enters a collection and screening tank, where filters intercept larger debris, such as branches and garbage. The wastewater then flows into a sedimentation tank for initial sedimentation, allowing some solid matter, such as silt, to settle, completing a preliminary physical separation and reducing the burden of subsequent treatment. The wastewater, after initial screening, flows into a straw-based water purification tank. Within this tank, the straw, through its structure and composition, absorbs nitrogen and phosphorus from the wastewater. The gaps between the straw stalks also filter out smaller debris, minimizing water quality fluctuations and creating a stable environment for the subsequent activated sludge processing. The wastewater then flows into the activated sludge tank, where the biofilm within provides a support for microorganisms to attach and grow. Aeration pipes continuously aerate the tank, ensuring an aerobic environment for the microorganisms in the activated sludge. Under aerobic conditions, the microorganisms use the activated sludge to absorb remaining nitrogen and phosphorus from the wastewater and remove pathogens and other disease-causing bacteria, achieving advanced wastewater treatment. The treated wastewater then flows into a second straw tank for secondary straw adsorption, further stabilizing water quality and preventing fluctuations that could impact the subsequent water purification process in the constructed wetland. Wastewater flowing from the straw tank ultimately enters the wetland conditioning tank, where aquatic plants absorb nutrients through their roots, microorganisms decompose organic pollutants, and the matrix filters the wastewater. These three processes work synergistically to further treat the wastewater. The wetland conditioning tank can also be used for aquaculture, generating economic benefits while purifying wastewater. Throughout the entire treatment process, electromagnetic valves control the wastewater's residence time between tanks, ensuring that each treatment link is fully operational, ultimately achieving effective wastewater treatment and resource recycling.

[0022] This device takes the promotion of comprehensive utilization of straw and improvement of rural sewage treatment capacity as its starting point, and integrates the rural sewage treatment and straw pollution problems into a unified and comprehensive treatment. By utilizing their respective characteristics, it not only reduces the discharge of straw burning waste and sewage, but also reduces the cost of sewage treatment. It also provides a new idea for the treatment of agricultural straw, turning straw, which was originally a pollution source, into a new resource to achieve the purpose of promoting the comprehensive utilization of straw and improving rural sewage treatment capacity, thereby further promoting energy conservation and emission reduction.

[0023] (1) In combination with the current situation of agricultural straw and the demand for rural sewage treatment, the characteristics of straw in adsorbing nitrogen and phosphorus are utilized to build a sewage treatment system, promote the comprehensive utilization of straw, reduce greenhouse gas emissions, and improve the capacity of rural sewage treatment. After being used for a period of time, straw can also be returned to the fields as fertilizer, reducing the use of chemical fertilizers. At the same time, it can also reduce the pollution of water resources in agricultural production such as eutrophication caused by fertilizer loss, which not only protects the local ecological environment, but also helps to reduce the production and increase the efficiency of pesticides and fertilizers.

[0024] (2) Use abandoned earth pits and river channels in rural areas to build wetland regulating ponds, plant aquatic plants, and further treat sewage. This not only reduces energy consumption, but also promotes the development of aquaculture, improves the comfort of the living environment, and can increase farmers' income to a certain extent.

[0025] (3) Most of the raw materials for the system's infrastructure can be obtained locally, which reduces the cost of sewage treatment infrastructure construction and facilitates its subsequent promotion and application.

[0026] Experiments with this device confirm straw's excellent ability to absorb nitrogen and phosphorus. By integrating this concept with the current state of rural areas and rural sewage, a sewage treatment system has been constructed. This project not only provides new insights into the comprehensive utilization of straw but also addresses rural sewage treatment issues to a certain extent. The sewage treatment system, tailored to local conditions, features a simple structure, low cost, and easy management, making it suitable for rural deployment.

[0027] This device uses agricultural straw for sewage treatment, solving the dual problems of agricultural straw utilization and rural sewage treatment. Therefore, there are two key issues: first, how effective is straw at treating rural sewage, and second, how to build a sewage treatment system suitable for rural characteristics.

[0028] To address the issue of straw water treatment effectiveness, and considering the dispersed rural population and lack of specialized sewage treatment technicians, we designed a simple treatment process and conducted experiments. We crushed the straw into small pieces, soaked them in sewage, and measured the changes in total phosphorus and ammonia nitrogen content in the sewage over a 24-hour period. Some of the experimental data obtained are shown in Table 1. A line graph of the adsorption rate of total phosphorus and ammonia nitrogen by straw is plotted as shown below. Figure 4 shown.

[0029] From Table 1 and Figure 4 It can be seen that the adsorption rate of straw on total phosphorus in sewage can reach 37.5%, and the adsorption rate on ammonia nitrogen can reach 21.4%, indicating that straw has a good effect in adsorbing nitrogen and phosphorus in sewage.

[0030]

[0031] The embodiments of the present invention are presented for purposes of illustration and description and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those skilled in the art. The embodiments are chosen and described in order to better illustrate the principles of the invention and its practical application and to enable those skilled in the art to understand the invention and design various embodiments with various modifications as suited for specific applications.

Claims

1. A sewage treatment equipment based on straw purification, characterized in that: The invention comprises a collecting primary screening pool, a straw water purification pool and a wetland regulating pool (21), wherein the collecting primary screening pool comprises a collecting primary screening pool (11), the straw water purification pool comprises a first straw pool (15), an activated sludge pool (16) and a second straw pool (17), and the wetland regulating pool (21) comprises a wetland regulating pool (21). A first connecting pipe (12) is fixedly installed between the collecting primary screening pool and the straw water purification pool, and a third connecting pipe (2) is fixedly installed between the straw water purification pool and the wetland regulating pool (21). Electromagnetic valves are fixedly installed on the first connecting pipe (12) and the third connecting pipe (2), and a filter is fixedly installed inside the end of the third connecting pipe (2).

2. The sewage treatment equipment based on straw purification according to claim 1 is characterized in that: A sewage inlet pipe (1) is fixedly installed at the initial end of the collecting and primary screening pool (11), and a filter screen 1 is installed in the end of the first connecting pipe (12) located inside the collecting and primary screening pool (11).

3. The sewage treatment equipment based on straw purification according to claim 1 is characterized in that: The first straw pool (15) and the second straw pool (17) both comprise a permeable screen frame (19), wherein straw and activated sludge are placed in the permeable screen frame (19), and the activated sludge pool (16) is located between the first straw pool (15) and the second straw pool (17), and the activated sludge pool (16) is located at the bottom of the straw water purification pool.

4. The sewage treatment equipment based on straw purification according to claim 3 is characterized in that: The activated sludge tank (16) is provided with a biofilm and an aeration pipe.

5. The sewage treatment equipment based on straw purification according to claim 1, characterized in that: Second connecting pipes (18) are fixedly installed between each of the first straw pool (15), the activated sludge pool (16) and the second straw pool (17), and each second connecting pipe (18) is provided with a solenoid valve.

6. The sewage treatment equipment based on straw purification according to claim 5, characterized in that: The biofilm is located inside the aeration tube, a blower (14) is fixedly installed at the end of the aeration tube, and an electric wire (13) is installed outside the blower (14).

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