A shallow buried domestic sewage ecological treatment system and a treatment method thereof

Abstract

The application discloses a kind of shallow buried domestic sewage ecological treatment system, including communication in sequence's sedimentation tank, microbial reaction pool and filter adsorption pool;Sedimentation tank and microbial reaction pool top are provided with first cover plate;Filter adsorption pool top is provided with second cover plate, wherein, sedimentation tank and microbial reaction pool top are provided with second cover plate;Filter adsorption pool top is provided with first cover plate;Microbial reaction pool includes microbial reaction layer by treatment filler;The treatment filler includes resin, inorganic matrix, microbial inoculant and inoculant activator.The application constructs a kind of shallow buried domestic sewage ecological treatment system, only need to dig about 1 meter depth, it can be constructed to still be normal use in cold winter domestic sewage treatment system, and because the depth of digging is not deep, farmer can maintain cleaning to equipment, greatly improve the practicability of equipment.

Description

Technical Field

[0001] This invention belongs to the field of domestic sewage treatment technology, specifically relating to a shallow buried ecological treatment system for domestic sewage and its treatment method. Background Technology

[0002] To address the unique characteristics of rural domestic sewage in different regions, the main treatment processes currently employed include constructed wetlands, biological treatment, and MBR membrane treatment. Constructed wetlands offer low construction costs but slow treatment results, require a large area, and are prone to clogging over long periods. Biological treatment provides good results and requires less space, but treatment and subsequent maintenance costs are higher. MBR membrane treatment achieves high standards and rapid results, but also requires regular membrane cleaning and replacement, resulting in high operating costs.

[0003] In addition, in areas where winter temperatures drop below zero, the treatment systems often need to be dug to a depth of at least 3 meters to ensure that the wastewater treatment system can function in the low-temperature environment. However, this method makes it difficult for farmers to clean and maintain the treatment system due to the excessive depth, and the excessive depth also poses certain safety hazards. Summary of the Invention

[0004] To address the aforementioned shortcomings in the existing technology, this invention provides a shallow-buried ecological treatment system for domestic sewage and its treatment method. This invention designs a shallow-buried ecological treatment system for domestic sewage.

[0005] To achieve the above objectives, the technical solution adopted by the present invention to solve its technical problem is as follows:

[0006] A shallow-buried ecological treatment system for domestic sewage is characterized by comprising a sedimentation tank, a microbial reaction tank, a filtration and adsorption tank, and a solar energy system connected in sequence.

[0007] The sedimentation tank and the microbial reaction tank are equipped with a second cover plate; the filtration and adsorption tank is equipped with a first cover plate; the microbial reaction tank includes a microbial reaction layer composed of treatment packing material; the treatment packing material includes resin, inorganic matrix, microbial agent and agent activator.

[0008] The microbial agents used in the microbial reactor are commonly chosen in this field, including *Pseudoxanthomonas* (family Xanthomonadaceae), *Sphingomonas* (family Sphingomonasadaceae), *Comamonadaceae*, and *Shewanella*, with abundances of 10–15%, 10–15%, 5–10%, and 10–15%, respectively.

[0009] Furthermore, the weight percentages of each component in the packing are as follows:

[0010] The composition consists of 5-10% resin, 30-50% inorganic matrix, 5-10% microbial activator, and the remainder is microbial inoculant.

[0011] Furthermore, the weight percentages of each component in the packing are as follows:

[0012] The composition consists of 5% resin, 50% inorganic matrix, 5% microbial activator, and the remainder is microbial inoculant.

[0013] Furthermore, the resin is a thiourea-formaldehyde resin.

[0014] Furthermore, the inorganic matrix comprises biochar, vermiculite, and gravel in a weight ratio of 1–3:1–2:1–2.

[0015] Furthermore, the microbial activator includes iron salts, polysaccharides, rhamnolipids, and amino acid esters in a weight ratio of 3–5:1–2:1–3:0.5–2.

[0016] Furthermore, the microbial activator comprises iron salts, polysaccharides, rhamnolipids, and amino acid esters in a weight ratio of 3:1:1:0.5.

[0017] Furthermore, the iron salts are soluble iron salts.

[0018] Furthermore, the sedimentation tank is connected to the inlet; the inlet is located 10-30cm below the ground surface.

[0019] Furthermore, the solar energy system includes solar panels and batteries; the solar energy system is electrically connected to the aeration equipment to supply power to it; the aeration equipment is used to aerate the microbial reaction tank.

[0020] An ecological treatment method for domestic sewage involves using the aforementioned shallow-buried ecological treatment system for domestic sewage, and then introducing domestic sewage into it.

[0021] The beneficial effects of this invention are:

[0022] 1. In this application, thiourea-formaldehyde resin is used as the substrate of the microbial reaction tank, combined with an inorganic substrate, which can effectively adsorb various harmful components in wastewater, especially heavy metal ions contained in wastewater, and can effectively purify wastewater.

[0023] 2. Thiourea-formaldehyde resin has excellent adsorption properties in water treatment, but it also has a certain inhibitory effect on microorganisms. Therefore, this application adds an auxiliary agent to the matrix, which is a compound of iron salts, polysaccharides, rhamnolipids, and amino esters. Iron salts effectively promote microbial growth and can also bind with thiourea-formaldehyde resin, reducing its inhibitory effect on microorganisms. Rhamnolipids have micellar catalysis, converting nitrogen, oxygen, polysaccharides, and other components in the air into amino acid-like substances and sugars, which become effective nutrients that can be utilized by microorganisms, thus promoting their growth. Amino esters are commonly used to promote plant root growth, but they also enhance microbial activity. When compounded with rhamnolipids, the effects of both are significantly enhanced, further reducing the inhibitory effect of thiourea-formaldehyde resin on microbial activity.

[0024] 3. This invention constructs a shallow-buried ecological treatment system for domestic sewage. It only requires digging to a depth of about 1 meter to construct a domestic sewage treatment system that can still be used normally in the cold winter. Moreover, because the digging depth is not deep, farmers can maintain and clean the equipment themselves, which greatly improves the practicality of the equipment. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of this application.

[0026] The components include: 1. Sedimentation tank; 2. Microbial reaction tank; 3. Filtration and adsorption tank; 4. Solar energy system; 5. Aeration equipment; 6. First cover plate; 7. Second cover plate; 8. Inlet. Detailed Implementation

[0027] The specific embodiments of the present invention are described below to enable those skilled in the art to understand the present invention. However, it should be understood that the present invention is not limited to the scope of the specific embodiments. For those skilled in the art, various changes are obvious as long as they are within the spirit and scope of the present invention as defined and determined by the appended claims. All inventions utilizing the concept of the present invention are protected.

[0028] Example 1

[0029] A shallow-buried ecological treatment system for domestic sewage, such as Figure 1 As shown, the shallow buried domestic sewage ecological treatment system includes a sedimentation tank 1, a microbial reaction tank 2, and a filtration and adsorption tank 3 connected in sequence.

[0030] During this period, a first cover plate 6 is installed above the sedimentation tank 1 and the microbial reaction tank 2; a second cover plate 7 is installed above the filtration and adsorption tank.

[0031] The microbial reactor includes a microbial reaction layer composed of treatment packing material; the treatment packing material comprises the following components by weight percentage:

[0032] The composition consists of 5% thiourea-formaldehyde resin, 50% inorganic matrix, 6% microbial activator, and the remainder is microbial inoculant.

[0033] Microbial inoculants are commonly used in this field, including *Pseudoxanthomonas* (family Xanthomonadaceae), *Sphingomonas* (family Sphingomonasadaceae), *Comamonadaceae*, and *Shewanella*. Their abundances were 10.2%, 11.4%, 8.6%, and 10.5%, respectively.

[0034] The inorganic matrix consists of biochar, vermiculite, and gravel in a weight ratio of 1:1:2.

[0035] The microbial activator consists of ferrous sulfate, polysaccharide, rhamnolipid, and amino acid ester in a weight ratio of 3:1:1:0.5.

[0036] In addition, the sedimentation tank 1 is connected to the inlet 8; the inlet 8 is located 10-30 cm below the ground. Furthermore, a solar energy system 4 and an aeration device 5 are also installed.

[0037] The solar energy system 4 includes a solar controller, the first terminal of which is electrically connected to the automatic control system; a solar panel, which is electrically connected to the second terminal of the solar controller; a storage battery, which is electrically connected to the third terminal of the solar controller; and a solar power supply device that supplies power, in which the solar controller converts the solar energy obtained by the solar panel into electrical energy and stores it in the storage battery; the second terminal of the frequency converter is electrically connected to the sludge return pump, the aeration blower, and the sewage lift pump, respectively, and the sewage lift pump is connected to the water distribution network of the microbial reaction tank of the sewage treatment system, and the aeration blower is connected to the air distribution network of the microbial reaction tank of the sewage treatment system.

[0038] The landscape plants in filtration and adsorption pond 3 include reeds, cattails, rushes, calamus, canna lilies, yellow irises, water chestnuts, windmill grass, thalia, vetiver, water hyacinth, water hyacinth, duckweed, hyacinth, lotus, water lilies, azolla, water hyacinth, eelgrass, hydrangea, elm, foxtail, sedge, willow, dawn redwood, pond cypress, or combinations thereof, with a seeding rate of 10-15 grams per square meter. The soil layer is 0.3-0.5 meters high, the land is relatively flat, and the soil does not contain stones or other debris. Preferably, the support layer includes mineral aggregates such as gravel, pebbles, or pebbles; the particle size of the mineral aggregates (gravel, pebbles, or pebbles, etc.) in the support layer is 1-5 cm.

[0039] This invention employs a programmable automatic control system, eliminating the need for manual management and maintenance. It is low-carbon, energy-saving, and environmentally friendly, effectively utilizing natural energy sources, reducing operating costs, and improving the intelligence level of wastewater treatment. It can be widely applied to various wastewater treatment environments, meeting national standards for effluent water quality. The automatic control system controls the frequency converter, automatically controlling the operating status of the aeration blower, thus automating the wastewater treatment system, reducing operating costs, and improving the intelligence level and stability of effluent water quality in various wastewater treatment processes.

[0040] Example 2

[0041] In this embodiment, the mechanical structure of the shallow-buried domestic sewage ecological treatment system is the same as that in Embodiment 1, with only the microbial reaction tank 2 being adjusted, as follows:

[0042] The microbial reactor includes a microbial reaction layer composed of treatment packing material; the treatment packing material comprises the following components by weight percentage:

[0043] The composition consists of 5% thiourea-formaldehyde resin, 50% inorganic matrix, 6% microbial activator, and the remainder is microbial inoculant.

[0044] Microbial inoculants are commonly used in this field, including *Pseudoxanthomonas* (family Xanthomonadaceae), *Sphingomonas* (family Sphingomonasadaceae), *Comamonadaceae*, and *Shewanella*, with abundances of 10%, 11%, 8%, and 12%, respectively.

[0045] The inorganic matrix consists of biochar, vermiculite, and gravel in a weight ratio of 1:1:2.

[0046] The microbial activator consists of ferrous sulfate, polysaccharides, rhamnolipids, and amino acid esters in a weight ratio of 3:2:1.5:0.5.

[0047] Example 3

[0048] In this embodiment, the mechanical structure of the shallow-buried domestic sewage ecological treatment system is the same as that in Embodiment 1, with only the microbial reaction tank 2 being adjusted, as follows:

[0049] The microbial reactor includes a microbial reaction layer composed of treatment packing material; the treatment packing material comprises the following components by weight percentage:

[0050] The composition consists of 10% thiourea-formaldehyde resin, 50% inorganic matrix, 10% microbial activator, and the remainder is microbial inoculant.

[0051] Microbial inoculants are commonly used in this field, including *Pseudoxanthomonas* (family Xanthomonadaceae), *Sphingomonas* (family Sphingomonasdaceae), *Comamonadaceae*, and *Shewanella*, with abundances of 12%, 15%, 5%, and 12%, respectively.

[0052] The inorganic matrix consists of biochar, vermiculite, and gravel in a weight ratio of 1:1:2.

[0053] The microbial activator consists of ferrous sulfate, polysaccharides, rhamnolipids, and amino acid esters in a weight ratio of 2:1:1.5:0.5.

[0054] Comparative Example 1

[0055] Compared with Example 1, only the composition of the treatment filler was modified, and a filler without thiourea-formaldehyde resin was used for treatment; the rest of the process was the same as in Example 1.

[0056] Comparative Example 2

[0057] Compared with Example 1, the treatment packing material in the microbial reaction tank lacks amine ester as the bacterial activator, while the rest of the process is the same as in Example 1.

[0058] Comparative Example 3

[0059] Compared with Example 1, the treatment packing material in the microbial reaction tank uses sugar alcohol instead of amino acid ester, and the rest of the process is the same as in Example 1.

[0060] Comparative Example 4

[0061] Compared with Example 1, the microbial activator in the treatment packing material of the microbial reaction tank is commercially available HMC indigenous microbial activator, and the rest of the process is the same as in Example 1.

[0062] Experimental Example

[0063] 1. Place the treatment packing materials constructed in Examples 1-3 and Comparative Examples 1-4 of this application into conical flasks with ground glass stoppers and graduations, store them at room temperature for 20 days, and then prepare dilutions. Take 1 mL from each dilution and place it in a sterile Petri dish and mix it with nutrient agar medium. After incubating at a certain temperature for 48 hours, record the number of colonies formed in each Petri dish and calculate the total number of colonies contained in each gram (or each mL) of the original sample.

[0064] As can be seen from the cultivation, the average survival rates of the microorganisms cultivated in Examples 1-3 of this application reached approximately 96.4%, 96.3%, and 95.8%, respectively. The average survival rate of the microorganisms cultivated in Comparative Example 1 reached approximately 98.2%. However, the average survival rates of the microorganisms cultivated in Comparative Examples 2-4 were significantly lower than those in Comparative Example 1 and Examples 1-3 of this application, at only 76.8%, 80.4%, and 74.3%, respectively.

[0065] 2. The treatment systems constructed in Examples 1-3 and Comparative Examples 1-4 of this application were used to treat rural domestic sewage in a certain area, and the treatment effect was then tested. The results are shown in Table 1. COD, BOD, ammonia nitrogen, and total phosphorus in the sewage were selected as the detection indicators, and their concentrations in the sewage were: COD 460 mg / L, BOD 340 mg / L, ammonia nitrogen 48 mg / L, and total phosphorus greater than 30 mg / L.

[0066] Table 1 Removal rates of various indicators after wastewater treatment

[0067]

[0068] As can be seen from the results in Table 1, although the technical solution of Comparative Example 1 can increase the survival rate of microorganisms to higher than that of Examples 1-3, the overall treatment effect of the solution on sewage cannot reach the effect of Examples 1-3 of this application due to the lack of thiourea resin.

[0069] In Comparative Examples 2-4, the bacterial activator was partially and completely replaced, respectively. It can be seen that the replaced technical solutions are not only significantly inferior to Examples 1-3 and Comparative Example 1 in terms of microbial viability, but also have a significantly reduced sewage treatment efficiency.

[0070] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A shallow-buried ecological treatment system for domestic sewage, characterized in that, It includes a sedimentation tank, a microbial reaction tank, a filtration and adsorption tank, and a solar energy system connected in sequence; The sedimentation tank and the microbial reaction tank are equipped with a second cover plate; the filtration and adsorption tank is equipped with a first cover plate. The microbial reaction tank includes a microbial reaction layer composed of treatment packing material; the weight percentages of each component in the treatment packing material are as follows: The composition consists of 5-10% resin, 30-50% inorganic matrix, 5-10% microbial activator, and the remainder is microbial inoculant. The resin is thiourea-formaldehyde resin; the microbial activator comprises iron salts, polysaccharides, rhamnolipids and amino acid esters in a weight ratio of 3~5:1~2:1~3:0.5~2.

2. The shallow-buried ecological treatment system for domestic sewage according to claim 1, characterized in that, The weight percentages of each component in the treatment packing are as follows: The composition consists of 5% resin, 50% inorganic matrix, 5% microbial activator, and the remainder is microbial inoculant.

3. The shallow-buried ecological treatment system for domestic sewage according to claim 1 or 2, characterized in that, The inorganic matrix comprises biochar, vermiculite, and gravel in a weight ratio of 1~3:1~2:1~2.

4. The shallow-buried ecological treatment system for domestic sewage according to claim 1, characterized in that, The microbial activator comprises iron salts, polysaccharides, rhamnolipids, and amino acid esters in a weight ratio of 3:1:1:0.

5.

5. The shallow-buried ecological treatment system for domestic sewage according to claim 1, characterized in that, The sedimentation tank is connected to the water inlet; the water inlet is located 10-30cm below the ground.

6. The shallow-buried ecological treatment system for domestic sewage according to claim 1, characterized in that, The solar energy system includes solar panels and a battery; the solar energy system is electrically connected to the aeration equipment to supply power to it; the aeration equipment is used to aerate the microbial reaction tank.

7. A method for ecological treatment of domestic sewage, characterized in that, The shallow buried domestic sewage ecological treatment system according to any one of claims 1 to 6 is used, and then domestic sewage is introduced into it.

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