Rural domestic sewage treatment system

Abstract

The utility model provides a rural domestic sewage treatment system which comprises an adjusting tank, a bacteria culture tank, a bacteria-algae symbiotic tank, a benthic symbiotic tank and a water storage tank which are sequentially connected, an adjusting pump for adjusting the liquid level of the bacterium culture pond is arranged between the adjusting pond and the bacterium culture pond, a water valve is arranged on a pipeline for connecting the bacterium culture pond and the bacterium-algae symbiotic pond, suspended filler is arranged in the bacterium culture pond, the top of the bacterium-algae symbiotic pond is arranged in a light-transmitting mode, and the benthic symbiotic pond adopts an algae-grass-fish mode. Macromolecular substances in rural domestic sewage are decomposed into micromolecular substances, organic nitrogen and phosphorus are decomposed into inorganic nitrogen and phosphorus which can be absorbed by carp algae, the inorganic nitrogen and phosphorus can be supplied to growth and reproduction of anaerobic bacteria and can also be supplied to growth and reproduction of bacteria and algae in a subsequent bacteria-algae symbiotic pool, the construction cost is reduced, the economic value is improved, and the environment is beautified.

Description

Technical Field

[0001] The utility model relates to the technical field of rural domestic sewage treatment, in particular to a rural domestic sewage treatment system. Background Art

[0002] There are many administrative villages in my country. The daily sewage generation of a rural town with a population of 4,000-6,000 people can reach about 500 tons. It mainly comes from the sewage discharged during the daily life of residents (kitchen, bathroom, bathing, laundry, etc.), which contains a large amount of grease, microorganisms, and debris. It has high nitrogen and phosphorus content, stable water quality, good biodegradability, and obvious peak-to-valley difference. At present, rural non-point source pollution mainly comes from the disorderly discharge of untreated domestic sewage. The large amount of organic matter and microorganisms contained in the sewage cannot be effectively treated, thereby polluting surface water and groundwater, causing the overall deterioration of the rural environment. Therefore, how to achieve the harmless treatment of rural domestic sewage is the key to the comprehensive improvement of the rural environment.

[0003] There are two types of sewage treatment modes: centralized sewage treatment mode and decentralized sewage treatment mode. The centralized sewage treatment mode is suitable for cities and towns with concentrated populations, while the decentralized sewage treatment mode is suitable for rural areas with more dispersed populations. Most of the existing decentralized sewage treatment facilities in my country use traditional contact oxidation, activated sludge, artificial wetlands (plants), and non-powered processes. Some only use a single aeration method with high energy consumption; some use plant treatment methods such as artificial wetlands, which occupy a large area, are affected by climate, and are unstable in operation.

[0004] CN202226754U discloses an integrated rural sewage treatment system, which is composed of a sewage collection tank, a biological treatment system, and a sludge tank. The sewage collection tank is connected to the biological treatment system through a water delivery pump. The biological treatment system includes an anoxic tank, an anaerobic tank, an aerobic tank, and a secondary sedimentation tank. The sludge tank is placed beside the anoxic tank and the anaerobic tank and connected to the secondary sedimentation tank through an air stripping device. The process has the advantages of stable technical performance, good treatment effect, low investment, small footprint, simple operation, and convenient management.

[0005] CN204281506U discloses a device for removing pollutants from rural domestic sewage, comprising a three-compartment septic tank, a filter, an anaerobic suspended filler bed reaction tank, a hypoxic aeration tank, a vertical flow sedimentation tank, an artificial aquatic plant bed and a phosphorus absorption tank connected in sequence. The device has the advantages of high treatment efficiency, effluent water quality reaching Class A standard, small footprint, and low operation and maintenance costs.

[0006] The existing rural sewage treatment system is highly dependent on seasons and temperature, and each treatment unit basically requires manual excavation, which is labor-intensive. In addition, although the constructed sewage treatment system meets the basic sewage treatment performance, it has limited effect on the rational use of rural land and beautification of the rural environment. Rural areas usually have large and small ponds, which have natural conditions for the construction of aquatic ecosystems, so the above characteristics can be fully utilized for artificial construction of ecosystems. Utility Model Content

[0007] In view of the deficiencies in the prior art, the utility model provides a rural domestic sewage treatment system. In order to achieve the above-mentioned purpose, the utility model adopts the following technical solutions:

[0008] A rural domestic sewage treatment system comprises a regulating tank, a bacteria cultivation tank, a bacteria-algae symbiotic tank, a benthic symbiotic tank and a water storage tank which are connected in sequence, wherein a sewage inlet and a sewage outlet are respectively arranged at the upstream and downstream of the regulating tank, a regulating pump for regulating the liquid level of the bacteria cultivation tank is arranged between the regulating tank and the bacteria cultivation tank, a water valve is arranged on the pipeline connecting the bacteria cultivation tank and the bacteria-algae symbiotic tank, a hanging filler is arranged in the bacteria cultivation tank, the top of the bacteria-algae symbiotic tank is light-transmitting, and the benthic symbiotic tank adopts an algae-grass-fish mode.

[0009] Furthermore, a first overflow port is provided on one side of the bacteria-algae symbiosis pool, and the first overflow port is connected to the benthic symbiosis pool.

[0010] Furthermore, a second overflow port is provided on one side of the benthic symbiosis pond, and the second overflow port is connected to the water storage tank.

[0011] Furthermore, the suspended filler is 0.3-0.5m away from the water surface, and the filling ratio of the suspended filler is 20%-40% of the volume of the bacteria culture tank.

[0012] A light-transmitting net is arranged on the top of the bacteria-algae symbiosis pool, and a light source group is arranged inside.

[0013] Furthermore, a filler layer is provided at the bottom of the benthic symbiosis pool, and a heat preservation layer and a heating system are provided on both sides.

[0014] Furthermore, the filler layer includes a crushed stone layer and a gravel layer laid successively up and down.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] Bacteria culture pools are used to decompose macromolecules in rural domestic sewage into small molecules, and organic nitrogen and phosphorus into inorganic nitrogen and phosphorus absorbed by carp algae, which can not only provide the growth and reproduction of anaerobic bacteria, but also provide the growth and reproduction of bacteria and algae in the subsequent bacteria-algae symbiosis pool. The bacteria in the bacteria-algae symbiosis pool are aerobic bacteria, which can further strengthen the decomposition of macromolecules and provide algae growth. The algae grown in the bacteria-algae symbiosis pool enters the algae-grass-fish-benthic symbiosis pool to provide food for fish, reducing the use of feed. At the same time, the fed fish can also generate economic value. The algae-grass-fish-benthic symbiosis pool can be constructed using restricted ponds in rural areas, reducing construction costs, increasing economic value, and beautifying the environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described below in conjunction with the accompanying drawings and embodiments:

[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0019] Figure 2 It is a structural schematic diagram of the benthic symbiosis pond of the utility model.

[0020] In the above drawings: regulating tank 1, bacteria culture tank 2, bacteria-algae symbiosis tank 3, benthic symbiosis tank 4, water storage tank 5, regulating pump 6, sewage inlet 7, hanging filler 8, water valve 9, light source group 10, first overflow port 11, insulation layer 12, crushed stone layer 13, gravel layer 14, second overflow port 15, heating system 16, sewage outlet 17, light-transmitting net 18. DETAILED DESCRIPTION

[0021] The technical solution of the present utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0022] Embodiment 1:

[0023] like Figure 1~Figure 2 As shown, the utility model provides a technical solution, a rural domestic sewage treatment system, the regulating tank 1 is connected to the bacteria culture tank 2 through the regulating pump 6, the bacteria culture tank 2 is connected with the bacteria-algae symbiosis tank 3, the algae-grass-fish-benthic symbiosis tank 4, and the water storage tank 5 in sequence; the regulating tank 1 can adjust the water volume of rural domestic sewage to keep the water volume input to the subsequent treatment unit stable, the bacteria culture tank 2 is an anaerobic environment, and anaerobic bacteria are used to decompose macromolecules to produce nutrients such as nitrogen and phosphorus; water containing nutrients is transported to the bacteria-algae symbiosis tank 3 through a pipeline, and the aerobic bacteria therein continue to decompose organic pollutants, and together with the nutrients and CO2 produced by the bacteria culture tank 2, supply algae growth and reproduction, the algae and water in the bacteria-algae symbiosis tank 3 enter the algae-grass-fish-benthic symbiosis tank 4 for further treatment and feeding, and fish and benthic organisms are cultured, and finally the water with qualified water quality enters the water storage tank 5 for recycling.

[0024] In this embodiment, a sewage inlet 7 is provided on the upper part of one side of the regulating tank 1, and a sewage outlet 17 is provided on the bottom of the other side. The sewage outlet 17 is connected to the regulating pump 6 pipeline to maintain a stable water volume in the regulating tank 2 and input it into the subsequent treatment unit.

[0025] In this embodiment, a hanging filler 8 is provided in the bacteria culture pool 2. The hanging filler 8 is 0.3-0.5 m away from the water surface to provide an attachment site for anaerobic bacteria.

[0026] In this embodiment, a water valve 9 is provided on the pipeline connecting the bacteria culture pool 2 and the bacteria-algae symbiosis pool 3 to prevent oxygen, algae, and other types of bacteria in the bacteria-algae symbiosis pool from entering the bacteria culture pool 2 and affecting the treatment effect of the bacteria culture pool 2.

[0027] Preferably, the filling ratio of the suspended filler 8 is 20%-40% of the volume of the bacteria culture tank 2 .

[0028] Preferably, the length-to-width ratio of the bacteria culture pool 2 is 2-2.5:1, and the depth is 2.5-3.5 m; the bacteria cultured in the bacteria culture pool 2 are anaerobic bacteria.

[0029] Preferably, a light-transmitting net 18 is provided on the top of the bacteria-algae symbiosis pond 3 to block external impurities while ensuring the penetration of natural light for the growth and reproduction of algae; a light source group 10 is provided inside, and when the output of algae cannot meet the needs of subsequent fish, the light source group 10 is started to supplement light to enhance the production of algae.

[0030] Preferably, the light intensity of the light source group 10 is 8000-12000 Lux.

[0031] Preferably, a first overflow port 11 is provided on one side of the bacteria-algae symbiosis pool 3, and the first overflow port 11 is connected to the algae-grass-fish-benthic symbiosis pool 4, so that the algae-treated water and the algae with higher density produced in the bacteria-algae symbiosis pool can overflow into the algae-grass-fish-benthic symbiosis pool 4, the water is further treated, and the algae is used as feed to feed the fish.

[0032] Further preferably, the length-to-width ratio of the bacteria-algae symbiosis pool 3 is 5-5.5:1, and the depth is 0.5-1m, wherein the cultured bacteria are aerobic bacteria, and the algae are diatoms and / or green algae, which are mainly diatoms when the temperature is lower than 25°C, and mainly green algae when the temperature is higher than 25°C.

[0033] Preferably, a second overflow port 15 is provided on one side of the algae-grass-fish-benthic symbiosis pond 4, and the second overflow port 15 is connected to the water storage tank 5, so that the water that meets the water quality standards after deep treatment of the algae-grass-fish-benthic organisms is sent to the water storage tank 5 for temporary storage for subsequent recycling.

[0034] Further preferably, a filler layer is provided at the bottom of the algae-grass-fish-benthic symbiotic pond 4, and a heat preservation layer 12 and a warming system are provided on both sides, so that the water temperature is maintained in a relatively stable state, reducing the influence of seasons.

[0035] Furthermore, the filler layer includes a crushed stone layer 13 and a gravel layer 14 from top to bottom; the crushed stone layer 13 has a thickness of 5-10 cm and a crushed stone particle size of 0.8-1.5 cm; the gravel layer 14 has a thickness of 3-5 cm, providing a growth environment and space for benthic organisms and submerged plants.

[0036] Preferably, the density of benthic organisms in the algae-grass-fish-benthic symbiotic pond 4 is 0.2-0.5 tails / m2; the grass is a submerged plant with a density of 10-20 plants / m2.

[0037] Preferably, if the daily sewage treatment volume is 1, the volume of the bacteria culture pool 2 is 1 / 3-1 / 2 of the daily sewage treatment volume, the volume of the bacteria-algae symbiosis pool 3 is 2-6 times the daily sewage treatment volume, and the volume of the algae-grass-fish-benthic symbiosis pool 4 is 4-10 times the daily sewage treatment volume.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution of the utility model, which should be included in the scope of the claims of the utility model.

Claims

1. A rural domestic sewage treatment system, characterized in that: The invention comprises a regulating tank, a bacteria culture tank, a bacteria-algae symbiotic tank, a benthic symbiotic tank and a water storage tank which are connected in sequence. A sewage inlet and a sewage outlet are respectively arranged at the upstream and downstream of the regulating tank. A regulating pump for regulating the liquid level of the bacteria culture tank is arranged between the regulating tank and the bacteria culture tank. A water valve is arranged on the pipeline connecting the bacteria culture tank and the bacteria-algae symbiotic tank. A hanging filler is arranged in the bacteria culture tank. The top of the bacteria-algae symbiotic tank is light-transmitting. The benthic symbiotic tank adopts an algae-grass-fish mode.

2. A rural domestic sewage treatment system as claimed in claim 1, characterized in that: A first overflow port is provided on one side of the bacteria-algae symbiosis pool, and the first overflow port is connected to the benthic symbiosis pool.

3. A rural domestic sewage treatment system as claimed in claim 1, characterized in that: A second overflow port is provided on one side of the benthic symbiosis pool, and the second overflow port is connected to the water storage tank.

4. A rural domestic sewage treatment system as claimed in claim 1, characterized in that: The hanging filler is 0.3-0.5m away from the water surface, and the filling ratio of the hanging filler is 20%-40% of the volume of the bacteria culture tank.

5. A rural domestic sewage treatment system as claimed in claim 1, characterized in that: A light-transmitting net is arranged on the top of the bacteria-algae symbiosis pool, and a light source group is arranged inside.

6. A rural domestic sewage treatment system as claimed in claim 1, characterized in that: A filler layer is arranged at the bottom of the benthic symbiosis pool, and a heat preservation layer and a temperature increasing system are arranged on both sides.

7. A rural domestic sewage treatment system as claimed in claim 6, characterized in that: The filler layer comprises a crushed stone layer and a gravel layer which are laid successively up and down.

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