A waste recycling system for rural domestic sewage

Abstract

The present application relates to a kind of waste recycling system for rural domestic sewage, belong to environmental engineering water pollution control technical field.The system includes domestic sewage regulating reservoir, micro-algae symbiotic purification unit, aquatic ecosystem unit, and water quality on-line monitoring system is equipped at the effluent of micro-algae symbiotic purification unit and aquatic ecosystem unit, and is connected with data processing terminal.Polluted water into domestic sewage regulating reservoir is settled under the action of gravity in water large particle material, and the water body after preliminary treatment of domestic sewage is discharged into micro-algae symbiotic purification unit by outlet, and the water after purification by micro-algae symbiotic purification unit enters aquatic ecosystem unit, and aquatic plant is planted in the aquatic ecosystem unit.The system can solve the problem of current rural domestic sewage and realize the recycling of waste.

Description

Technical Field

[0001] This invention belongs to the field of environmental engineering water pollution control technology, specifically relating to a waste recycling system for rural domestic sewage. Background Technology

[0002] Due to significant differences in the generation and management of rural domestic sewage compared to urban areas, traditional water pollution purification processes and methods have encountered numerous problems in rural domestic sewage treatment. The energy consumption involved in pollution control significantly reduces the effectiveness of treatment, and the vast majority of pollutants removed are essential elements for plant and animal growth. Based on the needs and development requirements for rural domestic sewage treatment, an economical, efficient, convenient, low-carbon purification system with resource recovery capabilities is particularly important. Summary of the Invention

[0003] The purpose of this invention is to provide a waste recycling system for rural domestic sewage, which solves the current problem of domestic sewage in rural areas and realizes the recycling of waste.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A waste recycling system for rural domestic sewage includes a sewage storage tank, a micro-algae symbiotic purification unit, and an aquatic ecosystem unit. Electric valves are installed between the sewage storage tank and the micro-algae symbiotic purification unit, and between the micro-algae symbiotic purification unit and the aquatic ecosystem unit. An online water quality monitoring system is installed at the outlet of both the micro-algae symbiotic purification unit and the aquatic ecosystem unit. The electric valves and the online water quality monitoring system are connected to a data processing terminal. The electric valves between the sewage storage tank and the micro-algae symbiotic purification unit are effectively controlled by the data processing terminal based on the effluent flow rate. When the levels of various pollutants in the sewage within the micro-algae symbiotic purification unit meet the standards, the online water quality monitoring system feeds the data back to the data processing terminal, thereby opening the electric valves between the micro-algae symbiotic purification unit and the aquatic ecosystem unit, allowing sewage to flow into the aquatic ecosystem unit. When the levels of various pollutants in the sewage within the aquatic ecosystem unit meet the standards, the online water quality monitoring system feeds the data back to the data processing terminal, and the sewage is discharged.

[0006] The domestic sewage storage tank is equipped with an inlet and an outlet. Large particles in the sewage entering the tank settle naturally under gravity, resulting in pre-treated sewage that flows through the outlet into the micro-algae symbiotic purification unit. This unit consists of a reaction tank, a baffle plate, and a blower aeration system. The baffle plate divides the reaction tank into two parts. The blower aeration system is located at the bottom of the part containing the inlet of the micro-algae symbiotic purification unit and is used for aeration and oxygenation. The reaction tank contains microorganisms and algae.

[0007] Water purified by the micro-algae symbiotic purification unit enters the aquatic ecosystem unit, which includes a water distribution pipe and an aquatic plant planting trough. Aquatic filter-feeding animals are raised at the lower end of the water distribution pipe, and an aquatic plant planting trough with an inner diameter of 8 cm is set at the upper end with holes drilled every 15 cm. Aquatic vegetables are planted in the aquatic plant planting trough and a sponge and a fence net are provided.

[0008] Furthermore, the blower aeration device is externally connected to a solar panel.

[0009] Furthermore, the aquatic vegetables are one or more of the following: water celery, watercress, water chestnut, and water spinach.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0011] 1. This invention addresses the problems existing in rural domestic sewage treatment by proposing a biological and chemical coupling method. It combines aquatic biological ecological chain restoration technology with Internet of Things (IoT) technology to construct a waste recycling system for rural domestic sewage. The aquatic biological ecological chain restoration technology can effectively remove nutrients such as nitrogen and phosphorus from rural domestic sewage. In addition, this invention integrates an online water quality monitoring system based on IoT technology to achieve automation, store and monitor the data of the entire process, improve operational transparency, and allow operators to fully control the system's operation at any time, reducing the frequency of on-site investigations, saving manpower and improving work efficiency.

[0012] 2. The purification effect of this invention on rural domestic sewage meets the water quality requirements of surface water in the "Surface Water Environmental Quality Standard" (GB3838-2002), and can reach the standard of Class IV surface water.

[0013] 3. This invention is low in cost and easy to operate, and has a good removal effect on elements such as nitrogen and phosphorus in rural domestic sewage. At the same time, it can also harvest aquatic vegetables and filter-feeding shellfish regularly to increase economic benefits, achieving a double harvest of economic and environmental benefits. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the system structure of the present invention;

[0015] Figure 2 A top view of a water ecosystem unit;

[0016] Figure 3 Side view of a water ecosystem unit;

[0017] Figure 4 The effect of light intensity on the COD removal efficiency of the micro-algae symbiotic purification unit;

[0018] Figure 5 The effect of aeration time on COD removal efficiency of micro-algae symbiotic purification unit;

[0019] Figure 6 This is a diagram showing the COD removal effect of the micro-algae symbiotic purification unit.

[0020] Figure 7 This is a diagram showing the removal effect of the micro-algae symbiotic purification unit on TP.

[0021] Figure 8 This is a diagram showing the TN removal effect of the micro-algae symbiotic purification unit;

[0022] Figure 9 This is a diagram illustrating the effect of chlorophyll a removal on aquatic ecosystem units.

[0023] Figure 1 In the middle, 1-inlet, 2-domestic sewage storage tank, 3-data processing terminal, 4-blower aeration facility, 5-micro-algae symbiotic purification unit, 6-electric valve, 7-aquatic ecosystem unit, 8-aquatic plant planting trough, 9-online water quality monitoring system, 10-outlet, 11-sponge, 12-fence net. Detailed Implementation

[0024] The technical solution and effects of the present invention will be further described below with reference to the accompanying drawings and specific embodiments, but the scope of protection of the present invention is not limited thereto.

[0025] The online water quality monitoring system and blower aeration device in this invention are existing technologies. Example

[0026] like Figure 1As shown, a waste recycling system for rural domestic sewage includes a domestic sewage storage tank 2, a micro-algae symbiotic purification unit 5, and an aquatic ecosystem unit 7. Electric valves 6 are installed between the domestic sewage storage tank 2 and the micro-algae symbiotic purification unit 5, and between the micro-algae symbiotic purification unit 5 and the aquatic ecosystem unit 7. An online water quality monitoring system 9 is installed at the outlet of the micro-algae symbiotic purification unit 5 and the aquatic ecosystem unit 7. The electric valves 6 and 9 are connected to a data processing terminal 3. The electric valves between the domestic sewage storage tank 2 and the micro-algae symbiotic purification unit 5 are effectively controlled by the data processing terminal 3 based on the effluent flow rate. The data processing terminal 3 relies on the online water quality monitoring system. The online water quality monitoring system 9 issues instructions based on the feedback data, enabling it to obtain accurate water quality parameter measurement results in real time. Under the action of the domestic sewage storage tank 2, it can reduce peak effluent flow and improve the utilization rate of domestic sewage. When the content of each pollutant in the sewage within the micro-algae symbiotic purification unit 5 meets the standards, the online water quality monitoring system 9 will feed the data back to the data processing terminal 3, thereby opening the electric valve 6 between the micro-algae symbiotic purification unit 5 and the aquatic ecosystem unit 7, allowing sewage to flow into the aquatic ecosystem unit 7. When the content of each pollutant in the sewage within the aquatic ecosystem unit 7 meets the standards, the online water quality monitoring system 9 will feed the data back to the data processing terminal 3, and the sewage can be discharged through the outlet 10.

[0027] The domestic sewage storage tank 2 is equipped with an inlet 1 and an outlet. Large particles in the sewage entering the storage tank 2 naturally settle under gravity, resulting in pre-treated sewage that flows into the micro-algae symbiotic purification unit 5 through the outlet. The micro-algae symbiotic purification unit 5 consists of a reaction tank, a baffle plate, and a blower aeration device 4. The baffle plate divides the reaction tank into two parts. The blower aeration device 4 is located at the bottom of the part containing the inlet of the micro-algae symbiotic purification unit 5, and aeration and oxygenation are achieved using the blower aeration device 4. The reaction tank contains microorganisms and algae. The microorganisms include indigenous microorganisms and added compound microbial agents. The compound microbial agents are a mixture of five microbial agents with an OD600 value of 0.6-0.8: photosynthetic bacteria, Bacillus, Bifidobacterium, Lactobacillus, and Enterococcus faecalis. The algae are one or more of Chlorella, Oocystis, Navicula, and Cryptophyta. In this embodiment, the blower aeration device 4 is distributed in the water body. The blower aeration device 4 is connected to an external solar panel, which converts solar radiation into electrical energy and stores it. An AC inverter then converts the direct current into alternating current to power the aeration equipment. Through the synergistic effect of microorganisms and algae, the micro-algae symbiotic purification unit 5 can effectively remove carbon, nitrogen, phosphorus, and other substances from domestic sewage, offering significant advantages in simultaneously achieving sewage treatment and nutrient recovery.

[0028] Water purified by the micro-algae symbiotic purification unit 5 enters the aquatic ecosystem unit 7, which includes water distribution pipes and aquatic plant planting troughs 8, such as... Figure 2 As shown, the lower end of the water distribution pipe is used to cultivate aquatic filter-feeding animals, such as the triangular sail mussel, the pleated crown mussel, or the toothless mussel. The upper end has a planting trough 8 with an inner diameter of 8cm, perforated every 15cm. The planting trough 8 is used to cultivate aquatic vegetables and is equipped with a sponge 11 and a fence net 12. Figure 3 As shown, the aquatic vegetables are one or more of water celery, watercress, water chestnut, and water spinach. Water purified by aquatic ecosystem unit 7 is discharged through outlet 10. By utilizing the synergistic effect of aquatic filter-feeding animals and aquatic vegetables, algae can be effectively controlled while further removing nutrients such as nitrogen and phosphorus, restoring BOD5 and COD in the water to within the water body's tolerance range, thereby restoring the water body's self-purification capacity.

[0029] In this invention's rural domestic sewage waste recycling system, three units—a domestic sewage storage tank, a micro-algae symbiotic purification unit, and an aquatic ecosystem unit—work synergistically to purify rural domestic sewage. The sewage undergoes initial treatment in the storage tank, followed by further purification with the assistance of the micro-algae symbiotic purification unit and solar aeration facilities. Finally, it is further purified by the aquatic filter-feeding animals and aquatic vegetables in the aquatic ecosystem unit, thereby restoring the water body's self-purification capacity. Furthermore, the aquatic plants and animals growing in this unit retain economic value after water purification, realizing the resource-based reuse of rural domestic sewage. Example

[0030] Based on the micro-algae symbiotic purification unit of Example 1, the effects of light intensity and aeration time on the COD removal efficiency of this unit were investigated. Figure 4 As shown, after 15 days of treatment under light intensities of 3000 lux, 4000 lux, and 5000 lux, the COD removal rates of this unit were 73.16%, 88.50%, and 77.56%, respectively. This indicates that the COD degradation effect was best at a light intensity of 4000 lux, and the COD concentration remained relatively stable in the later stages. Figure 5 As shown, after 15 days of treatment with aeration times of 0.5 h / d, 1 h / d, and 2 h / d, the COD removal rates of this unit were 79.57%, 84.94%, and 88.47%, respectively. This indicates that increasing the aeration time can improve the COD removal efficiency.

[0031] Based on the micro-algae symbiotic purification unit of Example 1, it was used for wastewater treatment. Specifically, the algae and microorganisms in the micro-algae symbiotic purification unit were inoculated in an artificial climate and light incubator and cultured under the conditions of a culture temperature of 25±0.5℃, a light intensity of 4000 lux, an aeration time of 2h / d, and a light-dark ratio of 12h:12h. Every 2 days, 1 / 5 of the rural domestic sewage in the reactor was replaced with fresh rural domestic sewage. When the degradation effect of rural domestic sewage in the reactor was stable, it could be added to the micro-algae symbiotic purification unit.

[0032] The influent was artificially prepared to simulate rural domestic sewage. It consisted of glucose, starch, NH4Cl, KH2PO4, CaCl2, NaHCO3, and Fe2(SO4)3 in a specific ratio, with the addition of trace element solutions MgSO4·5H2O, CoCl2·6H2O, MnSO4·4H2O, and ZnSO4·7H2O. The influent COD, TP, and TN concentrations were 344–356 mg / L, 2.81–6.41 mg / L, and 20.27–30.43 mg / L, respectively, with a pH of 6–9 and a temperature of 15–25℃.

[0033] This invention was conducted under continuous water influent conditions, with a 15-day experiment performed at a suitable temperature. During the experiment, water quality indicators such as COD, total phosphorus, and total nitrogen in the influent and effluent were measured daily, and their removal rates were calculated. The results are as follows: Figure 6 , 7 8. For example Figures 6-8 As shown, under continuous influent conditions, the experiment was conducted continuously for 15 days, and the pollutant removal effect was good, with effluent COD, total phosphorus, and total nitrogen removal rates reaching 92.38%, 56.64%, and 84.31%, respectively. Figure 9 As shown, under the conditions of initial chlorophyll a concentration of 813.2±20.5μg / L and water temperature of 25℃, after 24 hours of continuous experiment, the removal rate of chlorophyll a by filter-feeding shellfish reached 90.04%.

[0034] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A waste recycling system for rural domestic sewage, characterized in that, The system includes a domestic sewage storage tank, a micro-algae symbiotic purification unit, and an aquatic ecosystem unit. Electric valves are installed between the domestic sewage storage tank and the micro-algae symbiotic purification unit, and between the micro-algae symbiotic purification unit and the aquatic ecosystem unit. An online water quality monitoring system is installed at the outlet of both the micro-algae symbiotic purification unit and the aquatic ecosystem unit. The electric valves and the online water quality monitoring system are connected to a data processing terminal. The electric valves between the domestic sewage storage tank and the micro-algae symbiotic purification unit are effectively controlled by the data processing terminal based on the effluent flow rate. When the levels of various pollutants in the sewage within the micro-algae symbiotic purification unit meet the standards, the online water quality monitoring system feeds the data back to the data processing terminal, thereby opening the electric valves between the micro-algae symbiotic purification unit and the aquatic ecosystem unit, allowing sewage to flow into the aquatic ecosystem unit. When the levels of various pollutants in the sewage within the aquatic ecosystem unit meet the standards, the online water quality monitoring system feeds the data back to the data processing terminal, and the sewage can then be discharged. The domestic sewage storage tank is equipped with an inlet and an outlet. Large particles in the sewage entering the tank settle naturally under gravity, resulting in pre-treated sewage that flows through the outlet into the micro-algae symbiotic purification unit. This unit consists of a reaction tank, a baffle plate, and a blower aeration system. The baffle plate divides the reaction tank into two parts. The blower aeration system is located at the bottom of the part containing the inlet of the micro-algae symbiotic purification unit and is used for aeration and oxygenation. The reaction tank contains microorganisms and algae. The microorganisms include indigenous microorganisms and added compound microbial agents. The compound microbial agents are a mixture of five microbial agents with an OD600 value of 0.6-0.8: photosynthetic bacteria, Bacillus, Bifidobacterium, Lactobacillus, and Enterococcus faecalis. The algae are one or more of Chlorella, Oocystis, Navicula, and Cryptophyta. Water purified by the micro-algae symbiotic purification unit enters the aquatic ecosystem unit, which includes a water distribution pipe and an aquatic plant planting trough. Aquatic filter-feeding animals are raised at the lower end of the water distribution pipe, and an aquatic plant planting trough with an inner diameter of 8 cm is set at the upper end with holes drilled every 15 cm. Aquatic vegetables are planted in the aquatic plant planting trough and a sponge and a fence net are provided. The blower aeration device is connected to an external solar panel; The aquatic vegetables are one or more of the following: water celery, watercress, water chestnut, and water spinach; Aquatic filter-feeding animals, including the triangular sail mussel, the pleated crown mussel, or the toothless mussel.

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