CN112551802A - Energy-saving and environment-friendly sewage treatment device and method - Google Patents
Energy-saving and environment-friendly sewage treatment device and method Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses an energy-saving and environment-friendly sewage treatment device, which comprises: a sewage collecting tank, a grid, a grit chamber, a culture tank, an aeration tank and a flocculation sedimentation tank; wherein, the water outlet of the sewage collecting tank is connected with the grit chamber, the ecological tank, the aeration tank and the flocculation sedimentation tank in turn; the grid is arranged between the water outlet of the sewage collecting tank and the grit chamber; emergent aquatic plants and floating plants are planted in the culture pond. The using method comprises the following steps: (1) opening a water outlet of the sewage collecting tank, and introducing the sewage in the sewage collecting tank into a grit chamber through a grid for sedimentation treatment; (2) introducing into a culture pond, and staying for 6-10 days; (3) introducing the mixture into an aeration tank for aeration treatment; (4) introducing into a flocculation sedimentation tank, adding a flocculating agent for flocculation treatment, and finally discharging after reaching the standard. The invention synthesizes the sewage treatment device with less investment, low energy consumption, energy conservation and environmental protection, and is a novel sewage treatment method with good practicability, easy popularization and application and extremely suitable for the national conditions.
Description
Technical Field
The invention relates to the technical field of sewage treatment, in particular to an energy-saving and environment-friendly sewage treatment device and method.
Background
With the rapid increase of economy in China, the problem of water pollution is increasingly serious along with industrialization and urbanization, wherein industrial wastewater and urban sewage are polluted most, and the sewage pollutes rivers and lakes where human beings rely on to live, so that the sewage becomes one of the reasons for benefiting the living environment of the human beings. Therefore, how to effectively treat water pollution has attracted extensive social attention.
At present, the sewage treatment methods which are commonly used at home and abroad generally comprise a Fenton reagent method, a photocatalytic oxidation method, an ozone oxidation method, an activated sludge method and the like, but the technologies have the defects of large occupied area, large investment, higher treatment cost, lower standard reaching rate of wastewater treatment and the like, so the method is greatly limited in practical engineering popularization.
The phytoremediation technology has the advantages of low investment and maintenance cost, simple operation, self-renewal, strong sustainability, no secondary pollution and the like, can effectively remove organic matters, nitrogen, phosphorus and the like in the water body, increase the dissolved oxygen in the water body, inhibit the propagation of harmful algae, inhibit the re-release of nutritive salt in the sediment into the water, and is beneficial to the biological balance of the water body. Therefore, the phytoremediation technology is practical, cheap and efficient as a means for sewage treatment, and has attracted wide attention of domestic and foreign scholars.
However, most of the existing sewage treatment methods adopting floating plants to remove phosphorus and nitrogen have the defects of long hydraulic retention time, large floor area and the like.
Therefore, the technical personnel in the field need to solve the problem of how to provide an energy-saving and environment-friendly sewage treatment device and method.
Disclosure of Invention
In view of the above, the present invention provides an energy-saving and environment-friendly sewage treatment apparatus and method, so as to solve the deficiencies in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
an energy-saving and environment-friendly sewage treatment device comprises: a sewage collecting tank, a grid, a grit chamber, a culture tank, an aeration tank and a flocculation sedimentation tank; wherein, the water outlet of the sewage collecting tank is connected with the grit chamber, the ecological tank, the aeration tank and the flocculation sedimentation tank in turn; the grid is arranged between the water outlet of the sewage collecting tank and the grit chamber; emergent aquatic plants and floating plants are planted in the culture pond.
The invention has the beneficial effects that various physical treatment modes and the biological characteristics of emergent aquatic plants and floating plants are comprehensively utilized, the energy-saving and environment-friendly sewage treatment device with low investment and energy consumption is synthesized, and the novel sewage treatment method is a novel sewage treatment method which has good practicability, is easy to popularize and use and is extremely suitable for national conditions.
Furthermore, the material of the grating is a stainless steel square steel pipe, and the width of the gap is 20-30 mm.
The stainless steel square steel pipe has the beneficial effects that large impurities in sewage can be intercepted through the stainless steel square steel pipe, and later-stage precipitation treatment is facilitated.
Further, the grit chamber is a horizontal flow type grit chamber, the length is 30-50m, the width is 5-10m, and the depth is 2-3 m.
The further technical scheme has the beneficial effects that the horizontal flow type grit chamber can remove the sewage with the grain diameter of more than 0.2mm and the density of more than 2.65t/m3The sand grains can protect the pipeline, valve and other facilities from abrasion and blockage, and has the advantages of simple structure, good treatment effect, stable work and the like.
Further, the aeration tank is a biological aerated filter.
The aeration biological filter tank has the beneficial effects that the aeration biological filter tank is a new process integrating biological oxidation and suspended solid interception, can remove SS, COD, BOD and AOX (harmful substances) in sewage, and has the functions of nitrification, denitrification and dephosphorization. Compared with the common activated sludge method, the method has the advantages of high organic load, small occupied area (1/3 of the common activated sludge method), less investment (saving 30%), no sludge expansion, high oxygen transmission efficiency, good effluent quality and the like, reduces the treatment difficulty of a subsequent flocculation sedimentation tank, and has the characteristics of large volume load, large hydraulic load, short hydraulic retention time, less required capital investment, good effluent quality, low operation energy consumption and low operation cost.
Further, the emergent aquatic plant is at least one of a redroot, an evergreen iris and a canna; the floating plant is at least one of HUANGHUASHUILONG, JIAOCAO and DAHUANG.
The beneficial effect of adopting the further technical scheme is that the emerging plants and the floating plants of the invention can react with NH in sewage3N, TN and TP have good purifying effect, specifically, NH in water body3A part of the N is removed by plant absorption and volatilization and another part by successive reactions of nitrification and denitrification; because the plants need to absorb inorganic nitrogen as the nutrient components of the plants and are used for synthesizing organic nitrogen such as plant protein, and an aerobic-anoxic-anaerobic microenvironment can be formed near the roots of the plants, so that the coexistence of nitrifying bacteria and denitrifying bacteria is facilitated, the nitrification and denitrification effects of microorganisms are enhanced, and the purification efficiency of N in sewage is improved; the removal of phosphorus from water is carried out in the form of phosphate settling and being bound to the substrate, on the one hand, and the uptake of the available phosphorus by the plants, on the other hand.
An application method of an energy-saving and environment-friendly sewage treatment device specifically comprises the following steps:
(1) opening a water outlet of the sewage collecting tank, intercepting large impurities in the sewage by a grid, introducing the sewage into a grit chamber for sedimentation treatment, and removing sand grains to obtain sewage A;
(2) introducing the sewage A into a culture pond, staying for 6-10 days, and absorbing a large amount of pollutants by emergent aquatic plants and floating plants to obtain sewage B;
(3) introducing the sewage B into an aeration tank for aeration treatment to obtain sewage C;
(4) and introducing the sewage C into a flocculation sedimentation tank, adding a flocculating agent for flocculation treatment, and finally discharging the sewage up to the standard.
Furthermore, in the step (1), the time for precipitation treatment is 4-6 h.
The further technical scheme has the beneficial effects that through precipitation treatment for 4-6 hours, sand grains in the sewage can be fully precipitated, and are convenient to remove.
Further, in the step (3), the concentration of dissolved oxygen in aeration treatment is 2-4mg/L, the water temperature is 15-25 ℃, and the time is 3-6 h.
Adopt above-mentioned further technical scheme's beneficial effect to lie in, through aeration treatment, to forcing into air in the sewage, make in the pond sewage and air contact oxygenate to stir liquid, the transfer of oxygen in the acceleration of air to in the liquid prevents that the pond suspended object from sinking, strengthens the contact of organic matter in the pond with microorganism and dissolved oxygen, carries out oxidative decomposition to organic matter in the sewage.
Further, in the step (4), the flocculating agent is at least one of poly-phosphorus ferric chloride, poly-phosphorus aluminum chloride, poly-ferric aluminum sulfate chloride, polyacrylamide and sodium polyacrylate.
The further technical scheme has the beneficial effects that the inorganic flocculating agents selected from the poly-phosphorus ferric chloride, the poly-phosphorus aluminum chloride, the poly-ferric aluminum sulfate chloride and the like can provide a large amount of complex ions and can strongly adsorb colloid particles, colloid is condensed through the adsorption, bridge frame and crosslinking action, the physical and chemical changes are generated at the same time, the charges on the surfaces of the colloid particles and suspended matters are neutralized, the delta potential is reduced, the colloid particles are changed from the original repulsion to the attraction, the micelle stability is damaged, the colloid particles are mutually collided, flocculent coagulation precipitates are formed, and the surface area of the precipitates can reach (200-2Per g, has extremely high adsorption capacity. The organic polymer flocculant such as polyacrylamide, sodium polyacrylate and the like selected by the invention can improve the efficiency by times, and the product has stable quality and lower price.
According to the technical scheme, compared with the prior art, the invention has the following beneficial effects:
1. the land resource is saved, the environment is beautified, the operation is stable, the operation and maintenance cost is low, and the expensive civil engineering investment of the traditional sewage treatment plant is saved;
2. a small processing center can be built according to the geographic environment of individual areas without investing in huge pipe network construction;
3. has more efficient dephosphorization and denitrification capability and high sewage discharge standard which reaches the first grade A standard of the sewage discharge standard.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
FIG. 1 is a schematic structural diagram of an energy-saving and environment-friendly sewage treatment device provided by the invention.
Wherein, the method comprises the steps of 1-sewage collecting tank, 2-grid, 3-grit chamber, 4-culture tank, 5-aeration tank and 6-flocculation sedimentation tank.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
Example 1
The embodiment 1 of the invention discloses an energy-saving and environment-friendly sewage treatment device, as shown in figure 1, comprising: a sewage collecting tank 1, a grid 2, a grit chamber 3, a culture tank 4, an aeration tank 5 and a flocculation sedimentation tank 6; wherein, the water outlet of the sewage collecting tank 1 is connected with a grit chamber 3, an ecological tank, an aeration tank 5 and a flocculation sedimentation tank 6 in turn; the grid 2 is arranged between the water outlet of the sewage collecting tank 1 and the grit chamber 3; emergent aquatic plants and floating plants are planted in the culture pond 4. The invention comprehensively utilizes various physical treatment modes and biological characteristics of emergent aquatic plants and floating plants to synthesize the sewage treatment device which has the advantages of low investment, low energy consumption, energy conservation and environmental protection, and is a novel sewage treatment method which has good practicability, is easy to popularize and use and is extremely suitable for the national conditions.
In one embodiment, the material of the grating 2 is stainless steel square steel pipe, and the gap width is 20 mm; in another embodiment, the gap width is 30 mm; in other embodiments, the gap width is also 25 mm. The invention can intercept large impurities in sewage by passing through the stainless steel square steel pipe, and is convenient for later precipitation treatment.
In one embodiment, the grit chamber 3 is a horizontal flow grit chamber, with a length of 30m, a width of 5m, and a depth of 2 m; in another embodiment, the length is 50m, the width is 10m, and the depth is 3 m; in other embodiments, the length is 40m, the width is 8m, and the depth is 2.5 m. The horizontal flow type grit chamber can remove sewage with the grain diameter of more than 0.2mm and the density of more than 2.65t/m3The sand grains can protect the pipeline, valve and other facilities from abrasion and blockage, and has the advantages of simple structure, good treatment effect, stable work and the like.
In one embodiment, aeration tank 5 is a biological aerated filter. The aeration biological filter tank of the invention is a new process integrating biological oxidation and suspended solid interception, can remove SS, COD, BOD and AOX (harmful substances) in sewage, and has the functions of nitrification, denitrification and dephosphorization. Compared with the common activated sludge method, the method has the advantages of high organic load, small occupied area (1/3 of the common activated sludge method), less investment (saving 30%), no sludge expansion, high oxygen transmission efficiency, good effluent quality and the like, reduces the treatment difficulty of the subsequent flocculation sedimentation tank 6, and has the characteristics of large volume load, large hydraulic load, short hydraulic retention time, less required capital investment, good effluent quality, low operation energy consumption and low operation cost.
In one embodiment, the emergent aquatic plant is a thalictrum ramosissimum and the floating plant is a yellow croaker; in another embodiment, the emergent aquatic plants are iris evergreen and canna, and the floating plants are grasses gathering and big floats; in other embodiments, the emergent aquatic plants are reslothes, irish-greens, and canna, and the buoyant plants are daylily, polygrass, and dampis. The emergent aquatic plants and the floating plants of the invention can treat NH in sewage3N, TN and TP have good purifying effect, specifically, NH in water body3A part of the N is removed by plant absorption and volatilization and another part by successive reactions of nitrification and denitrification; since plants need to absorb inorganic nitrogen as their own nutrient components, they are used for synthesizing plant proteins and the likeOrganic nitrogen, and meanwhile, an aerobic-anoxic-anaerobic microenvironment can be formed near the roots of the plants, so that coexistence of nitrobacteria and denitrifying bacteria is facilitated, nitrification and denitrification of microorganisms are enhanced, and purification efficiency of N in sewage is improved; the removal of phosphorus from water is carried out in the form of phosphate settling and being bound to the substrate, on the one hand, and the uptake of the available phosphorus by the plants, on the other hand.
Example 2
The use method of the energy-saving and environment-friendly sewage treatment device specifically comprises the following steps:
(1) opening a water outlet of the sewage collecting tank 1, intercepting large impurities in the sewage by a grid 2, introducing the sewage into a grit chamber 3 for sedimentation treatment for 4 hours, and removing sand grains to obtain sewage A;
(2) introducing the sewage A into a culture pond 4, staying for 6 days, and absorbing a large amount of pollutants by emergent aquatic plants and floating plants to obtain sewage B;
(3) introducing the sewage B into an aeration tank 5 for aeration treatment, wherein the concentration of dissolved oxygen is 2mg/L, the water temperature is 15 ℃, and the time is 3 hours to obtain sewage C;
(4) and introducing the sewage C into a flocculation sedimentation tank 6, adding the poly-phosphorus ferric chloride for flocculation treatment, and finally discharging the sewage up to the standard.
Example 3
The use method of the energy-saving and environment-friendly sewage treatment device specifically comprises the following steps:
(1) opening a water outlet of the sewage collecting tank 1, intercepting large impurities in the sewage by a grid 2, introducing the sewage into a grit chamber 3 for precipitation treatment for 6 hours, and removing sand grains to obtain sewage A;
(2) introducing the sewage A into a culture pond 4, staying for 10 days, and absorbing a large amount of pollutants by emergent aquatic plants and floating plants to obtain sewage B;
(3) introducing the sewage B into an aeration tank 5 for aeration treatment, wherein the concentration of dissolved oxygen is 4mg/L, the water temperature is 25 ℃, and the time is 6 hours to obtain sewage C;
(4) and introducing the sewage C into a flocculation sedimentation tank 6, adding polymeric ferric aluminum sulfate chloride for flocculation treatment, and finally discharging the sewage after reaching the standard.
Example 4
The use method of the energy-saving and environment-friendly sewage treatment device specifically comprises the following steps:
(1) opening a water outlet of the sewage collecting tank 1, intercepting large impurities in the sewage by a grid 2, introducing the sewage into a grit chamber 3 for sedimentation treatment for 5 hours, and removing sand grains to obtain sewage A;
(2) introducing the sewage A into a culture pond 4, staying for 8 days, and absorbing a large amount of pollutants by emergent aquatic plants and floating plants to obtain sewage B;
(3) introducing the sewage B into an aeration tank 5 for aeration treatment, wherein the concentration of dissolved oxygen is 3mg/L, the water temperature is 20 ℃, and the time is 5 hours to obtain sewage C;
(4) and introducing the sewage C into a flocculation sedimentation tank 6, adding polyacrylamide and sodium polyacrylate for flocculation treatment, and finally discharging after reaching the standard.
Performance testing
The wastewater discharged from a certain factory in Fengyang county, Anhui province was treated by the wastewater treatment apparatus of example 1 and the method of example 4, and the COD (chemical oxygen demand), BOD (biochemical oxygen demand), NH (NH) of the wastewater and the wastewater were measured before and after the treatment, respectively3N (Ammonia Nitrogen) and SS (suspended solids) concentrations.
The measurement results are shown in table 1.
Table 1 measurement results of various index concentrations in example 1
| Measurement items | COD(mg/L) | BOD(mg/L) | NH3-N(mg/L) | SS(mg/L) |
| Emission standard | ≤100 | ≤30 | ≤25 | ≤30 |
| Waste water | 15000 | 6000 | 1200 | 2200 |
| Draining water | 78 | 26 | 18 | 12 |
| Removal Rate (%) | 99.48 | 99.57 | 98.50 | 99.45 |
As is clear from Table 1, COD, BOD and NH in the wastewater treated by the wastewater treatment apparatus of example 1 and the method of use of example 4 of the present invention3The concentration of N and SS is greatly reduced, the highest removal rate is as high as 99.57%, and finally the drainage meets the corresponding discharge standard.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. An energy-saving and environment-friendly sewage treatment device is characterized by comprising: a sewage collecting tank, a grid, a grit chamber, a culture tank, an aeration tank and a flocculation sedimentation tank;
the water outlet of the sewage collecting tank is sequentially connected with the grit chamber, the ecological tank, the aeration tank and the flocculation sedimentation tank;
the grid is arranged between the water outlet of the sewage collecting tank and the grit chamber;
emergent aquatic plants and floating plants are planted in the culture pond.
2. The energy-saving and environment-friendly sewage treatment plant according to claim 1, wherein the grid is made of stainless steel square steel pipes, and the width of the gap is 20-30 mm.
3. The energy-saving and environment-friendly sewage treatment plant as claimed in claim 1, wherein the grit chamber is a horizontal flow type grit chamber, the length is 30-50m, the width is 5-10m, and the depth is 2-3 m.
4. The energy-saving and environment-friendly sewage treatment plant according to claim 1, wherein the aeration tank is a biological aerated filter.
5. The energy-saving and environment-friendly sewage treatment plant according to claim 1, wherein the emergent aquatic plant is at least one of a redroot flower, an evergreen iris and a canna.
6. The energy-saving and environment-friendly sewage treatment plant according to claim 1, wherein the floating plants are at least one of yellow croaker, poly grass and big float.
7. The application method of the energy-saving and environment-friendly sewage treatment device is characterized by comprising the following steps:
(1) opening a water outlet of the sewage collecting tank, intercepting large impurities in the sewage by a grid, introducing the sewage into a grit chamber for sedimentation treatment, and removing sand grains to obtain sewage A;
(2) introducing the sewage A into a culture pond, staying for 6-10 days, and absorbing a large amount of pollutants by emergent aquatic plants and floating plants to obtain sewage B;
(3) introducing the sewage B into an aeration tank for aeration treatment to obtain sewage C;
(4) and introducing the sewage C into a flocculation sedimentation tank, adding a flocculating agent for flocculation treatment, and finally discharging the sewage up to the standard.
8. The use method of the energy-saving and environment-friendly sewage treatment device according to claim 7, wherein in the step (1), the precipitation treatment time is 4-6 h.
9. The use method of the energy-saving and environment-friendly sewage treatment device according to claim 7, wherein in the step (3), the concentration of the dissolved oxygen in the aeration treatment is 2-4mg/L, the water temperature is 15-25 ℃, and the time is 3-6 h.
10. The use method of the energy-saving and environment-friendly sewage treatment device according to claim 7, wherein in the step (4), the flocculating agent is at least one of poly-phosphorus ferric chloride, poly-phosphorus aluminum chloride, poly-ferric aluminum sulfate chloride, polyacrylamide and sodium polyacrylate.
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