CN114804540A - Near-zero-carbon sewage ecological treatment system and method - Google Patents

Near-zero-carbon sewage ecological treatment system and method Download PDF

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CN114804540A
CN114804540A CN202210565617.2A CN202210565617A CN114804540A CN 114804540 A CN114804540 A CN 114804540A CN 202210565617 A CN202210565617 A CN 202210565617A CN 114804540 A CN114804540 A CN 114804540A
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sewage
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plant
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CN114804540B (en
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尹文超
卢兴超
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China Architecture Design and Research Group Co Ltd
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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
    • 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
    • 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
    • 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
    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/38—Organic compounds containing nitrogen
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/007—Modular design
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/009—Apparatus with independent power supply, e.g. solar cells, windpower, fuel cells
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/22—O2
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/42—Liquid level
    • 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
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used

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  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biotechnology (AREA)
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  • Biodiversity & Conservation Biology (AREA)
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Abstract

The application relates to a near-zero-carbon sewage ecological treatment system and method, belongs to the technical field of sewage treatment, and solves the problems that a large amount of greenhouse gases are discharged by the existing sewage treatment method, and the influence of the greenhouse gas effect on the climate environment is aggravated. Nearly zero carbon sewage ecological treatment system includes: the solar power supply system is used for providing electric energy for the operation of the system; the sewage ecological treatment system comprises a sewage ecological treatment pool, a plant carbon fixation purification pool and a recycling pool; the sewage ecological treatment pool comprises a water distribution layer, a filtering and purifying layer, a water storage layer and a sludge discharge layer which are arranged from top to bottom, wherein the water distribution layer is connected with a sewage source, and the water storage layer is connected with a reuse pool; be equipped with the solid carbon-layer of plant in the solid carbon purification pond of plant, the solid carbon-layer of plant is located the top of water distribution layer, and the top cover on the solid carbon-layer of plant is equipped with the printing opacity cover, plants the clean carbon plant in the enclosure space that the printing opacity cover formed. The invention has good effect on sewage purification treatment and can achieve the aim of nearly zero carbon emission.

Description

Near-zero-carbon sewage ecological treatment system and method
Technical Field
The application belongs to the technical field of sewage treatment, and particularly relates to a near-zero-carbon sewage ecological treatment system and method.
Background
With the continuous advance of urbanization, the vigorous development of the construction industry, the transportation industry and the manufacturing industry leads toThe generation of urban greenhouse gases, sewage and waste water and industrial garbage causes certain pressure on the urban bearing capacity. Wherein, CO is used 2 The direct influence of the representative greenhouse gas (GHG) on global climate deterioration is more prominent, such as frequent extreme rainstorm, rise of sea level, thawing of glaciers in polar regions, frequent extreme cold weather and the like, and the generation of the greenhouse gas is closely related to industrial production, daily traffic, resident life and the like.
The sewage treatment technology in the traditional process needs to consume electric energy generated by fossil energy during aeration and dosing, and the electric energy production process generates carbon dioxide and belongs to a carbon emission process. The electric energy consumed by aeration in the whole sewage treatment process is mainly produced by fossil fuel production, and a large amount of greenhouse gases and harmful gases are generated in the process. According to the research of the prior scholars, the engineering SBR and An/O are adopted b Pro-hypoxia + A 2 The process comprises the following steps of treating each cubic meter of sewage to generate 150-500 gCO direct gas 2 Indirect gas 200-320 gCO 2 Total gas release amount is 380-830 gCO 2 In the meantime. When the ecological surface flow constructed wetland technology and the horizontal subsurface flow constructed wetland technology are adopted, 340-350 gCO direct gas is generated by treating sewage per cubic meter 2 Indirect 99gCO gas 2 Total gas release amount is 440-450 gCO 2 In the meantime. From the above analysis of carbon emissions, the current wastewater treatment technology is CO 2 Resulting in carbon emissions.
In conclusion, when the existing sewage treatment method is adopted to treat sewage, a large amount of greenhouse gases such as carbon dioxide and methane are discharged, the influence of greenhouse gas effect on the climatic environment is aggravated, meanwhile, the existing municipal sewage treatment plant has the defects of more mechanical equipment usage, high energy consumption, large occupied area and low treatment efficiency in the existing artificial wetland technology.
Disclosure of Invention
In view of the above analysis, the present invention aims to provide a near-zero carbon sewage ecological treatment system and method, so as to solve the problem that the existing sewage treatment method can discharge a large amount of greenhouse gases, and the influence of greenhouse gas effect on the climate environment is aggravated.
The purpose of the invention is realized as follows:
in one aspect, a near-zero carbon sewage ecological treatment system is provided, comprising:
the solar power supply system is used for providing electric energy for the operation of the system;
the sewage ecological treatment system comprises a sewage ecological treatment pool, a plant carbon fixation purification pool and a recycling pool;
the sewage ecological treatment pool comprises a water distribution layer, a filtering and purifying layer, a water storage layer and a sludge discharge layer which are arranged from top to bottom, wherein the water distribution layer is connected with a sewage source through a water distribution device, and the water storage layer is connected with a reuse pool through a drainage device;
the plant carbon fixation purification tank is internally provided with a plant carbon fixation layer which is arranged above the water distribution layer, the upper part of the plant carbon fixation layer is covered with a light transmission cover, and a carbon purification plant is planted in a closed space formed by the light transmission cover.
Furthermore, the near-zero-carbon sewage ecological treatment system also comprises an air interchanger and a waste gas collecting device, wherein the air interchanger and the waste gas collecting device are both communicated with the closed space of the light-transmitting cover, and an oxygen concentration sensor is arranged in the closed space of the light-transmitting cover; the ventilation device is used for supplying air into the closed space of the light-transmitting cover when the oxygen concentration in the closed space is low; the waste gas collecting device is used for discharging and collecting waste gas generated in the plant carbon fixation purifying pond.
Further, the near-zero-carbon sewage ecological treatment system further comprises a control and display system, wherein the control and display system is configured to control the water distribution device to replenish the water level in the water distribution layer to H1 in T2 time when the water level of the water distribution layer is lowered from H1 to H2 in T1 time;
H2=H1-V/S，T2=0.13~0.16T3；
in the above formula: h1 is the highest water distribution level (m);
h2 is the lowest water distribution level (m);
v is the sewage treatment capacity (m) in a single purification treatment period of the system 3 ）；
S is the system water distribution area (m) 2 ）；
T1 is the running time of a single decontamination processing period of the system;
t2 is the water distribution time of a single purification treatment period of the system;
t3 is the total time from the time when the water level in the water distribution layer reaches H1 to the time when the oxygen concentration in the plant carbon fixation purification tank reaches C1, and C1 is 13-14.8% vol.
Furthermore, T1 is 8-12 h, and T2 is 1-2 h.
Furthermore, the volume of the sewage ecological treatment pool is 3-5 times of the sewage treatment amount V in a single purification treatment period of the system, and the hydraulic load is 0.53-1.06 m 3 /（m 2 ·d）。
Further, the control and display system is also configured to start the operation of the air interchanger when the oxygen concentration in the plant carbon fixation purifying tank reaches C1, air enters the plant carbon fixation layer through the air output pipe of the air interchanger, and waste gas in the plant carbon fixation purifying tank is exhausted and collected through the waste gas exhaust pipe of the waste gas collecting device; when the oxygen concentration value in the plant carbon fixation layer is C2, the ventilation device stops working, wherein C2= 1.3-1.7C 1.
Further, the filtering and purifying layer comprises a primary purifying layer and a secondary purifying layer which are arranged from top to bottom; wherein, the first-stage purification layer is filled with shale ceramic particles, and the second-stage purification layer is filled with composite active alumina particles.
Furthermore, the drainage device comprises a drainage pipe and a drainage pump arranged on the drainage pipe, wherein a liquid inlet of the drainage pipe is positioned in the water storage layer, and a liquid outlet of the drainage pipe is connected into the recycling pool.
Further, the sludge discharging layer is connected with a sludge discharging device for discharging sludge; the sludge discharge device comprises a sludge discharge pipe and a sludge discharge pump arranged on the sludge discharge pipe.
Further, the carbon-free plants are modular vegetation previously cultivated in flowerpots or flower boxes.
Furthermore, the adjusting tank is connected with a sewage source treated by the pretreatment tanks, and a stirring device and a liquid level sensor are arranged in the adjusting tank.
Furthermore, a permeable partition plate is arranged between two adjacent layers of the plant carbon fixing layer, the water distribution layer, the primary purification layer, the secondary purification layer, the water storage layer and the sludge discharge layer.
Furthermore, the first-level purification layer and the second-level purification layer both adopt modular structures.
Further, ecological processing system of sewage still includes preliminary treatment pond, equalizing basin, and the upper reaches of the ecological preliminary treatment pond of sewage are located through the pipeline to the equalizing basin, and the upper reaches of equalizing basin are located through the pipeline to the preliminary treatment pond, and the treatment pond is connected with the detritus pond on upper reaches through the pipeline, and the detritus pond is connected with the sewage source on upper reaches.
Furthermore, the water distribution device comprises a water distribution pump, a liquid inlet of the water distribution pump is communicated with the regulating tank through a water inlet pipe, and a liquid outlet of the water distribution pump is communicated with the water distribution layer through a water distribution pipe.
Furthermore, the water distribution pipe is connected with a plurality of water distribution branch pipes, and the plurality of water distribution branch pipes are uniformly arranged in the water distribution layer; and a liquid level sensor is arranged in the water distribution layer.
On the other hand, the near-zero carbon sewage ecological treatment method utilizes the near-zero carbon sewage ecological treatment system.
Further, the method comprises the steps of:
building a solar power supply system and a sewage ecological treatment system;
domestic sewage is fed into a slag settling tank and then enters a sewage ecological treatment system for purification treatment, and the purified sewage is discharged into a reuse tank for water supply;
the domestic sewage entering the sewage ecological treatment system firstly enters a sediment tank, large-particle impurities are settled under the action of gravity, then enters a pretreatment tank, is filtered by a filtering component in the pretreatment tank, and overflows to an adjusting tank;
when the regulating tank reaches a preset water level, the water distribution pump is started, sewage in the regulating tank is supplied into the water distribution layer through the water distribution pipe, and the sewage is distributed into the sewage ecological treatment tank from top to bottom in the water distribution layer; sewage in the water distribution layer sequentially enters a primary purification layer and a secondary purification layer, pseudomonas stutzeri is added in the sewage ecological treatment tank, the sewage treated by the secondary purification layer enters a water storage layer and is supplied to a reuse tank through a drainage device for water supply;
in the process of sewage purification treatment, the carbon-purifying plants adsorb organic matters such as nitrogen, phosphorus and the like in the sewage, and absorb CO generated in the process of sewage treatment through photosynthesis 2 A gas.
Further, an oxygen concentration sensor monitors the oxygen concentration in a sealed space above the plant carbon-fixing layer in real time, when the oxygen concentration in the plant carbon-fixing layer reaches a value of C1, a scavenging pump starts to work, air enters the plant carbon-fixing layer through an air output pipe, and waste gas is discharged into a lime water filtering pool through a waste gas exhaust pipe; when the oxygen concentration value in the plant carbon fixation layer is C2, the ventilation pump stops working.
Furthermore, the energy required by the operation of the whole sewage ecological treatment system is provided by a solar power supply system.
Compared with the prior art, the invention can realize at least one of the following beneficial effects:
a) the solar power supply system is adopted to replace the traditional power supply system to supply power to the whole sewage ecological treatment system, and compared with the traditional sewage treatment process, the carbon emission is reduced by 10.00%; the sewage ecological treatment system realizes sewage low-carbonization ecological treatment, can avoid the generation of a large amount of carbon-containing gas, realizes large-scale reduction, and realizes the reduction of 78.57% of carbon emission compared with the traditional sewage treatment process; plant in the solid carbon purification pond of plant and have the adsorptivity strong, remove nitrogen effectual, the high aquatic plant of photosynthetic efficiency, plant roots carries out solidification treatment to the carbon in the sewage treatment process, also consumes the low concentration carbon dioxide who produces by the plant through photosynthesis, realizes the maximize degradation, for traditional sewage treatment process, realizes reducing 8.57% carbon emission. The near-zero carbon sewage treatment system can reduce the carbon emission by about 97.14 percent in an accumulated mode.
b) The proper gas components are maintained in the closed space on the plant solid carbon layer through the ventilation device and the waste gas collecting device, and the continuous and stable operation of the system is realized.
c) The invention reduces the emission of greenhouse gases from the source, reduces the generation of carbon, reduces the spread of carbon, realizes the low-carbon sewage ecological treatment, has important significance on the carbon emission of sewage and assists the realization of the double-carbon target.
Drawings
In order to more clearly illustrate the embodiments of the present specification or the technical solutions in the prior art, the drawings needed to be 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 some embodiments described in the embodiments of the present specification, and other drawings can be obtained by those skilled in the art according to the drawings.
FIG. 1 is a schematic structural view of a near-zero carbon sewage ecological treatment system of the present invention;
FIG. 2 is a schematic structural view of the sewage ecological treatment system of the present invention;
FIG. 3 is a schematic sectional view of the ecological sewage treatment system of the present invention;
FIG. 4 is a schematic structural view of a modular purification layer of the sewage ecological treatment system of the present invention;
FIG. 5 is a control logic diagram of the ecological sewage treatment method of the present invention.
Reference numerals:
1. domestic sewage;
2. a slag settling tank;
3. a sewage ecological treatment system; 31. a pretreatment tank; 32. a regulating tank; 33. a sewage ecological treatment tank; 331. a water inlet pipe; 332. a water distribution pump 333 and a water distribution pipe; 333-1, a water distribution branch pipe; 334. preparing a water layer; 335. a primary purification layer; 335-1, primary purification module a; 335-2, primary purification module b; 335-3, a primary purification module c; 335-4, a primary purification module d; 335-5, a primary purification module e; 336. a secondary purification layer; 336-1, a secondary purification module a; 336-2, a secondary purification module b; 336-3, a secondary purification module c; 336-4, a secondary purification module d; 336-5, a secondary purification module e; 337. a water storage layer; 337-1, a drain pipe; 337-2, draining pump; 338. discharging a mud layer; 338-1, a sludge collection funnel; 338-2, a sludge discharge pipe; 338-3, a dredge pump; 339. a water permeable barrier; 34. a recycling pool; 35. a plant carbon fixation layer; 351. a carbon-free plant; 352. a light-transmitting cover; 36. a ventilation device; 361. an air outlet duct; 362. a scavenging pump; 363. an air inlet pipe; 37. an exhaust gas pipe; 38. a lime water filtering tank;
4. a solar power supply system; 41. solar energy; 42. a photovoltaic energy storage facility;
5. a sludge discharge device.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
For the purpose of facilitating understanding of the embodiments of the present application, the following detailed description will be given with reference to the accompanying drawings, which are not intended to limit the embodiments of the present application.
In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly stated or limited, the term "connected" should be interpreted broadly, and may be, for example, a fixed connection, a detachable connection, or an integral connection, which may be a mechanical connection, an electrical connection, which may be a direct connection, or an indirect connection via an intermediate medium. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The terms "top," "bottom," "above … …," "below," and "on … …" as used throughout the description are relative positions with respect to components of the device, such as the relative positions of the top and bottom substrates inside the device. It will be appreciated that the devices are multifunctional, regardless of their orientation in space.
Example 1
A specific embodiment of the present invention, as shown in fig. 1 to 3, discloses a near-zero carbon sewage ecological treatment system, which comprises a solar power supply system 4 and a sewage ecological treatment system 3, wherein the solar power supply system 4 provides electric energy for system operation, and the sewage ecological treatment system 3 comprises a sewage ecological treatment pool 33, a plant carbon fixation purification pool and a recycling pool 34;
the sewage ecological treatment system 3 further comprises a pretreatment tank 31 and an adjusting tank 32, wherein the adjusting tank 32 is arranged at the upstream of the sewage ecological treatment tank 33 through a pipeline, the treatment tank 31 is arranged at the upstream of the adjusting tank 32 through a pipeline, the treatment tank 31 is connected with the slag settling tank 2 at the upstream through a pipeline, and the slag settling tank 2 is connected with at least one sewage source at the upstream.
The sewage ecological treatment tank 33 comprises a water distribution layer 334, a filtration purification layer, a water storage layer 337 and a sludge discharge layer 338 which are arranged from top to bottom, the adjusting tank 32 is communicated with the water distribution layer 334 through a water distribution device, and sewage primarily treated by the pretreatment tank 31 and the adjusting tank 32 is fed into the water distribution layer 334 through the water distribution device.
Wherein, the water distribution device includes water distribution pump 332 and inlet tube 331 and water distribution pipe 333 that are connected with water distribution pump 332, specifically, the inlet of water distribution pump 332 is connected with equalizing basin 32 through inlet tube 331, and the liquid outlet of water distribution pump 332 passes through water distribution pipe 333 and water distribution layer 334 intercommunication.
Further, in order to achieve uniform water replenishment in the water distribution layer 334, the water distribution pipe 333 is connected to a plurality of water distribution branch pipes 333-1, and the plurality of water distribution branch pipes 333-1 are uniformly arranged in the water distribution layer 334.
Further, a liquid level sensor is arranged in the water distribution layer 334 and used for monitoring the liquid level of the water distribution layer 334 in real time. When the water level of the water distribution layer 334 reaches the highest water distribution level H1, the system operates, the water level in the water distribution layer 334 gradually decreases, after the operation time T1, the water level of the water distribution layer decreases to the lowest water distribution level H2, at this time, water needs to be supplemented into the water distribution layer 334 through the water distribution pipe 333 by the water distribution pump 332 within the time T2, the water level in the water distribution layer 334 rises to H1 again, and when the water level rises to H1, water distribution is stopped.
The filtering and purifying layer is used for purifying sewage seeped under the water distribution layer 334, and adopts two-stage filtering, and specifically comprises a first-stage purifying layer 335 and a second-stage purifying layer 336 which are arranged from top to bottom; wherein, the first-stage purification layer 335 is filled with shale ceramisite, the particle size of the shale ceramisite is 10-15 mm, the thickness of the shale ceramisite is 600-800 mm, and meanwhile, the shale ceramisite material has better adsorbability to pollutants such as nitrogen, phosphorus and the like and organic matters in the domestic sewage; the secondary purification layer 336 is filled with composite active alumina particles, which has good adsorbability to pollutants and organic matters such as nitrogen, phosphorus and the like in the domestic sewage. The size of the composite active alumina particles is 10-15 mm, and the thickness of the composite active alumina particles is 600-800 mm. The composite activated alumina is an activated alumina layer taking construction waste aggregate as a core, the particle size of the construction waste aggregate is 5-10 mm, and the thickness of the activated alumina layer is 10-5 mm. Through setting up shale haydite + compound active alumina two-stage purification layer, from top to bottom the water distribution, the ecological treatment system core unit of structure, purifying effect is good.
The water storage layer 337 is used for storing purified water filtered and purified by the filtering and purifying layer, and the water storage layer 337 is connected with the recycling tank 34 through a drainage device. Specifically, the drainage device comprises a drainage pipe 337-1 and a drainage pump 337-2, for example, the drainage pipe 337-1 is arranged in the water storage layer 337, the drainage pipe 337-1 is provided with the drainage pump 337-2, the drainage pump 337-2 and the drainage pipe 337-1 discharge the water in the water storage layer 337 to the reuse tank 34, the chemical is added to the reuse tank 34 by the chemical adding pump, and the lift pump in the reuse tank 34 supplies the purified water in the reuse tank 34 to a water using point after being processed by the quartz sand filter.
The sludge discharging layer 338 is used for containing the aggregated suspended particles generated in the purification and filtration process, and the sludge discharging layer 338 is connected with a sludge discharging device 5 for discharging the sludge. The sludge discharge device 5 comprises a sludge discharge pipe 338-2, a sludge collection funnel 338-1 and a sludge discharge pump 338-3, specifically, the sludge discharge pipe 338-2 is arranged in the sludge discharge layer 338, the sludge collection funnel 338-1 is also arranged in the sludge discharge layer 338, the sludge discharge pump 338-3 is arranged on the sludge discharge pipe 338-2, the gradient of the bottom surface of the sludge discharge layer is 1%, the sludge discharge pipe 338-2 is inclined, and the sludge in the sludge discharge layer 338 is discharged through the sludge discharge pump 338-3 and the sludge discharge pipe 338-2.
The plant carbon fixation purification tank is a part of a sewage ecological treatment system, a plant carbon fixation layer 35 is arranged in the plant carbon fixation purification tank, the plant carbon fixation layer 35 comprises a biological ceramsite layer and a carbon purification plant 351 planted on the biological ceramsite layer, a light-transmitting cover 352 such as a glass cover or a plastic shed cover is covered on the plant carbon fixation layer 35, and the carbon purification plant 351 grows in a closed space formed by the light-transmitting cover 352; the plants with better carbon sequestration performance are adopted to circularly purify the sewage, and the photosynthesis of the plants effectively absorbs the carbon dioxide generated in the sewage treatment process, thereby realizing the carbon reduction and carbon reduction effects. The biological ceramsite is used as a biological membrane carrier filter material and has the advantages of light weight, large specific surface area, strong adsorption capacity and the like.
The sewage ecological treatment tank 33 is arranged in the underground space below the plant solid carbon layer 35, and the plant solid carbon layer 35 is positioned above the water distribution layer 334. This structural design helps realizing the setting of integrating of sewage ecological treatment pond 33 and the solid carbon purification pond of plant.
Optionally, in this embodiment, the carbon-purifying plant 351 is a plant with high carbon-fixing and oxygen-releasing capabilities, the planting mode is a water culture mode, the carbon-purifying plant 351 is placed in a flowerpot or a flower box with a depth of about 100-150 mm, a plurality of through holes are formed in the bottom of the flowerpot or the flower box, the roots of the carbon-purifying plant 351 penetrate through the through holes to enter the water distribution layer 334 and are filled with biological ceramsite with a particle size of 20-30 mm, which is detailed in table 1.
TABLE 1 carbon-free plant selection and Capacity analysis Table
Figure 889076DEST_PATH_IMAGE001
Further, the carbon-purified plant 351 is pre-cultivated in a flowerpot or a flower box to form a modular vegetation, the body of the flowerpot or the body of the flower box is made of a water-permeable material, and the modular vegetation is directly planted in the biological ceramic grain layer of the plant carbon-fixing layer 35 when the plant carbon-fixing purification tank is built. Through making net carbon plant 351 modularization vegetation in advance, not only be convenient for construct the cultivation, when needs are changed moreover, can directly change modularization vegetation can, convenient and fast.
In this embodiment, the near-zero carbon sewage treatment system further includes an air interchanger 36 and an exhaust gas collecting device, wherein the air interchanger 36 is communicated with the closed space of the light-transmitting cover 352, and is used for supplying air into the closed space of the light-transmitting cover 352 when the oxygen concentration in the closed space is low; the waste gas collecting device is communicated with the closed space of the light-transmitting cover 352 and is used for discharging and collecting plant solidsThe carbon purification tank generates excessive CO except for the growth of plant photosynthesis 2 Gases and acidic exhaust gases such as hydrogen sulfide.
The air interchanger 36 comprises an air interchanger 362, an air outlet of the air interchanger 362 is communicated with the closed space of the light-transmitting cover 352 through an air outlet pipe 361, an air inlet pipe 363 is connected with an air inlet of the air interchanger 362, and a valve and a flowmeter are arranged on the air outlet pipe 361 so as to realize accurate air exchanging amount; an oxygen concentration sensor is arranged in the closed space above the plant carbon fixation layer 35 and used for monitoring the oxygen concentration of the closed space above the plant carbon fixation layer, and the scavenging pump 362 is started or closed according to the monitored oxygen concentration value, so that the oxygen content in the closed space is maintained in a proper range.
The waste gas collecting device comprises a lime water filtering tank 38, the lime water filtering tank 38 is communicated with the closed space of the light-transmitting cover 352 through a waste gas exhaust pipe 37, acid waste gases such as carbon dioxide and hydrogen sulfide in the waste gas can be removed through lime water filtering liquid, and an exhaust pump, a valve and a flowmeter can be arranged on the waste gas exhaust pipe 37 to realize accurate waste gas discharge capacity.
The solar power supply system 4 is characterized in that photovoltaic energy storage facilities 42 are distributed on sites and spaces such as building roofs, building curtain walls and outdoor greenbelts, absorbed solar energy 41 is converted into electric energy and stored in the photovoltaic energy storage facilities 42, and the electric energy is used by power utilization facilities in the system. Because solar energy is influenced by limitations of solar illumination time, illumination angle, illumination intensity and the like, the solar energy is flexibly arranged in residential buildings and public buildings by combining the shapes of the buildings, for example, photovoltaic power generation facilities are arranged in places and spaces such as building roofs, building curtain walls, outdoor greenbelts and the like, absorbed solar energy is converted into electric energy and stored for use, self-sufficiency of energy in local areas is realized, and the use of fossil energy is effectively reduced.
In this embodiment, the treatment tank 31 is provided with a filtering component and an overflow pipe for filtering the sewage supplied from the slag settling tank 2, and the filtered sewage overflows into the adjusting tank 32 through the overflow pipe, wherein the filtering component comprises a grid filter, a hair collector and an oil dirt separator.
In this embodiment, a plurality of sewage sources can be adjusted in the equalizing basin 32, and sewage from different sources can all be supplied into the equalizing basin 32, sets up agitating unit in the equalizing basin 32, and sewage from different sources is evenly mixed in the equalizing basin 32 through agitating unit. A liquid level sensor is also arranged in the adjusting tank 32 and used for monitoring the water level height of the sewage in the adjusting tank 32.
In this embodiment, a water permeable partition 339 is horizontally disposed between two adjacent layers of the plant carbon-fixing layer 35, the water distribution layer 334, the primary purification layer 335, the secondary purification layer 336, the water storage layer 337 and the sludge discharge layer 338. In order to realize the modular construction of the ecological sewage treatment tank 33, a plurality of vertically parallel water-permeable partition plates 339 are longitudinally arranged in the ecological sewage treatment tank 33 and used for partitioning and fixing modular facilities of the primary purification layer 335 and the secondary purification layer 336, so that the replacement of the filler is convenient.
Further, the layer 335 is purified to the one-level and the layer 336 is purified to the second grade all adopts modular structure, and the installation construction of being convenient for promotes the efficiency of construction. Illustratively, as shown in FIG. 4, the primary purification layer 335 comprises a primary purification module a335-1, a primary purification module b335-2, a primary purification module c335-3, a primary purification module d335-4, and a primary purification module e335-5 arranged in parallel; the secondary purification layer 336 comprises a secondary purification module a336-1, a secondary purification module b336-2, a secondary purification module c336-3, a secondary purification module d336-4 and a secondary purification module e336-5 which are arranged in parallel.
The nearly zero carbon sewage ecological treatment system of this embodiment still includes control and display system, and control and display system are used for controlling the operation of nearly zero carbon sewage ecological treatment system and are used for showing nearly zero carbon sewage ecological treatment system's running state and operating parameter. The control and display system is configured to control the water dispenser to replenish the water level in the water distribution layer to H1 for a time T2 when the water level in the water distribution layer is lowered from H1 to H2 for a time T1. That is, when the water level of the water distribution layer reaches the maximum water distribution level H1, the water level of the water distribution layer is lowered to the minimum water distribution level H2 after the time of the system sewage purification operation T1, water is supplied again to the water distribution layer 334 by the water distribution device, the water level of the water distribution layer 334 is supplied to the maximum water distribution level H1 within the time of T2, the operation is continued for a time T1, and the operation is repeated to realize the sewage purification treatment.
The control and display system is also configured to start working when the oxygen concentration in the plant carbon fixation purification tank reaches C1, air enters the plant carbon fixation layer through the air output pipe, and waste gas in the plant carbon fixation layer is discharged into the lime water filtering tank 38 through the waste gas exhaust pipe; when the oxygen concentration value in the plant carbon fixation layer 35 is C2, the ventilation device stops working, wherein C2= 1.3-1.7C 1.
The embodiment also discloses a near-zero-carbon sewage ecological treatment method, and the near-zero-carbon sewage ecological treatment system is utilized.
FIG. 5 shows the control logic of the ecological sewage treatment method of the present embodiment.
The near-zero carbon sewage ecological treatment method comprises the following steps:
the method comprises the following steps: a solar power supply system 4 and a sewage ecological treatment system 3 are built.
Specifically, when the sewage ecological treatment tank 33 and the plant carbon fixation purification tank are constructed, a pit groove is excavated on the ground, a sludge discharge layer 338, a water storage layer 337, a secondary purification layer 336, a primary purification layer 335, a water distribution layer 334 and a plant carbon fixation layer 35 are laid from bottom to top, a carbon purification plant 351 is planted on the plant carbon fixation layer 35, a light-transmitting cover 352 is covered on the plant carbon fixation layer 35, and the carbon purification plant 351 is located in the inner space of the light-transmitting cover 352. The pretreatment tank 31, the adjusting tank 32 and the sewage ecological treatment tank 33 are built at certain positions, pipelines are laid, and various devices required by operation are installed. According to the position of the sewage ecological treatment system 3, photovoltaic energy storage facilities 42 are distributed in the places and spaces such as nearby building roofs, building curtain walls, outdoor greenbelts and the like, absorbed solar energy 41 is converted into electric energy and stored in the photovoltaic energy storage facilities 42, and the photovoltaic energy storage facilities 42 are electrically connected with electric facilities in the system.
Step two: the domestic sewage 1 is precipitated by the slag settling tank 2 and then is supplied to the sewage ecological treatment system 3 for purification treatment, and the purified sewage is discharged to the reuse tank 34 for water supply.
Specifically, domestic sewage 1 is discharged into a slag basin 2, the domestic sewage 1 is collected by the slag basin 2 and then discharged into a sewage ecological treatment system 3, the domestic sewage in the sewage ecological treatment system 3 firstly enters a pretreatment tank 31, is filtered by a filter assembly in the pretreatment tank 31 and then overflows into an adjusting tank 32, the adjusting tank 32 can uniformly mix the sewage from different sources, and the sewage in the adjusting tank 32 gradually rises;
when the adjusting tank 32 reaches a preset water level, the water distribution pump 332 is started to supply the sewage in the adjusting tank 32 into the water distribution layer 334 of the ecological sewage treatment tank 33 through the water distribution pipe 333, and the sewage is distributed to the ecological sewage treatment tank from top to bottom in the water distribution layer 334; the sewage in the water distribution layer 334 firstly enters the first-level purification layer 335, enters the second-level purification layer 336 under the action of self gravity, is subjected to second-level purification layer treatment, the sewage subjected to adsorption filtration and biological decomposition of biological filter materials enters the water storage layer 337, the purified sewage in the water storage layer 337 enters the recycling tank 34 through the drain pipe 337-1, large suspended particles are accumulated and then settle in the sludge discharge layer 338, and the collected suspended particles are discharged into the sludge collection funnel 338-1 under the action of gravity and then discharged through the sludge discharge pipe 338-2. Wherein, the purified sewage in the water storage layer 337 can be regularly supplied to the plant solid carbon layer 35 for watering the carbon-purified plant 351, and the purified sewage is filtered by the plant solid carbon layer 35 and then enters the recycling tank 34 again for secondary purification layer treatment, thereby improving the sewage treatment effect.
Meanwhile, the carbon-purifying plant 351 in the plant carbon-fixing layer 35 adsorbs nitrogen, phosphorus and other organic matters in the sewage, and the photosynthesis of the carbon-purifying plant 351 absorbs CO generated in the sewage treatment process 2 Gas, promoting photosynthesis to help plant growth. An oxygen concentration sensor in the plant carbon fixation purification tank monitors the oxygen concentration of gas in a sealed space above a plant carbon fixation layer in real time, when the oxygen concentration in the plant carbon fixation layer 35 reaches a value of C1, a scavenging pump 362 starts to work, air enters the plant carbon fixation layer 35 through an air output pipe 361, waste gas in the plant carbon fixation layer is discharged into a lime water filtering tank 38 through a waste gas exhaust pipe 37, and the lime water solution in the lime water filtering tank 38 removes gases such as carbon dioxide, hydrogen sulfide and the like in the waste gas; when the oxygen concentration value in the plant carbon fixation layer 35 is C2, the ventilation pump 362 stops working, wherein C2= 1.3-1.7C 1. Optionally, C1 is less than 15% vol, and C2 is more than or equal to 21% vol.
In the sewage purification process, a liquid level sensor in the water distribution layer 334 monitors the water level in the water distribution layer 334 in real time, when the water level of the water distribution layer reaches the highest water distribution level H1, the water level of the water distribution layer is reduced to the lowest water distribution level H2 after the system purifies sewage for T1 time, water is then distributed into the water distribution layer 334 again, the water level in the water distribution layer 334 is supplemented to the highest water distribution level H1 in T2 time, the operation is continued for T1 time, and the operation is repeated to realize sewage purification treatment. The sewage treatment in the process goes through the following stages: the instantaneous water inlet-treatment period T1-the instantaneous water discharge-water distribution period T2 are alternatively performed, so that the problems of easy blockage, insufficient oxygen supply and the like of the traditional artificial wetland are solved. Meanwhile, the running time and the water distribution time are related to the carbon treatment strength of the plants, the water distribution time is shorter if the carbon sequestration capacity of the plants is strong, and the water distribution time is longer if the carbon sequestration capacity of the plants is weak. The whole process can realize intelligent control through the real-time monitoring of the control system and the sensor.
Further, H2= H1-V/S;
wherein: h1 — maximum water distribution level (m);
h2 — lowest water distribution level (m);
v-amount of wastewater treated in a single cycle of purification treatment (m) of the system 3 ）；
S-System Water distribution area (m) 2 ）。
Further, the volume of the sewage ecological treatment pool 33 is 3-5 times of the sewage treatment amount V in a single purification treatment period of the system, and the hydraulic load is 0.53-1.06 m 3 /（m 2 ·d）。
The verification shows that the running time T1 of a single purification treatment period of the system is 8-12 hours, the water distribution time T2 of the single purification treatment period of the system is 1-2 hours, and the time parameter not only enables the sewage purification treatment effect of the system to be good, but also enables the growth environment of the carbon-purifying plant 351 to be appropriate, so that the system can run continuously and is closer to zero-carbon emission.
Furthermore, the water distribution time is related to the oxygen concentration, the total time from the time when the water level in the water distribution layer 334 reaches H1 to the time when the oxygen concentration in the plant carbon sequestration purification tank reaches C1 is T3, T2= 0.13-0.16T 3, and C1 is 13-14.8% vol.
In this embodiment, pseudomonas stutzeri is added into the ecological sewage treatment tank 33, and pseudomonas stutzeri can be added into one or more of the water storage layer 337, the secondary purification layer 336 or the primary purification layer 335 during the process of building the ecological sewage treatment system in the step one; alternatively, when the sewage is supplied to the ecological sewage treatment tank 33 in the second step, Pseudomonas stutzeri may be added to the supplied sewage, and the sewage mixed with Pseudomonas stutzeri may be supplied to the water distribution layer 334 to be infiltrated step by step to fill the whole ecological sewage treatment tank 33.
In this embodiment, the organic pollutants in the sewage in the dissolved and colloidal states are degraded and converted into harmless substances by the metabolism function of microorganisms, so that the sewage is purified. When sewage is fed into the water distribution layer 334, the sewage sequentially passes through the first-stage purification layer 335 and the second-stage purification layer 336 from top to bottom, after the sewage filters and purifies the porous filter material substrate for a long time, a layer of biomembrane is formed on the outer layer of the filter material substrate, and the biomembrane extends from the outer layer to form an anaerobic zone, a facultative zone and an aerobic zone from inside to outside, respectively growing nitrobacteria and denitrifying bacteria, and decomposing organic matters and colloid in the sewage by the microorganisms, meanwhile, pseudomonas stutzeri is added into the sewage in the sewage ecological treatment pool 33 to have good denitrification effect, according to experimental analysis, when the OD value of the concentration of the added bacteria solution is selected 600 =1.0, the feeding ratio V Bacterial liquid ：V Sewage to be treated The ratio of the bacteria liquid to the nitrogen in the sewage is 1: 200-1: 300, the bacteria liquid is continuously added for 10 days, the effect of the bacteria liquid on the nitrogen in the sewage is the best when the bacteria liquid is homogeneous at each time, then the system can automatically run without adding the bacteria liquid, the N element is absorbed and converted, the purpose of removing the nitrogen and purifying the sewage is achieved, and the emission of carbon-containing greenhouse gas is reduced.
Compared with the prior art, the system and the method for the ecological treatment of the nearly zero-carbon sewage provided by the embodiment have at least one of the following beneficial effects:
1. the sewage ecological treatment system adopts an ecological treatment process constructed by two-stage purification layers of shale ceramsite and composite activated alumina, realizes physical-chemical-biological synergistic degradation of organic matters, nitrogen and phosphorus in sewage, does not depend on a traditional mechanical aeration facility, reduces the sewage treatment energy consumption to the maximum extent, and adopts a solar power supply system to supply power for the energy consumption used in the sewage treatment operation; the plant carbon fixation layer is arranged in a relatively sealed space, plants with good carbon fixation performance are adopted to circularly purify sewage, and meanwhile, carbon dioxide generated in the sewage treatment process is effectively absorbed through plant photosynthesis, or appropriate gas components are maintained in a closed space on the plant carbon fixation layer through a ventilation device and a waste gas collecting device, so that the nearly zero carbon emission of sewage treatment is realized by integrating the plurality of emission reduction measures.
2. According to the existing research results, the gas emission generated by the traditional sewage treatment method is 350g of CO 2 /m, in this example, the amount of gas emitted during the purification treatment of the wastewater in the ecological wastewater treatment tank was 75g CO 2 /m, 78.57% reduction in gas emissions compared to conventional wastewater treatment technologies. In the embodiment, in the ecological treatment of sewage, the consumed electric energy is supplied by solar energy, and the equivalent of gas generated by the consumed energy for treating 1 cubic meter of sewage is 35g of CO 2 Equivalent to 10.00% of the gas discharge amount of the traditional sewage treatment technology. The amount of CO consumed per square meter of carbon fixation and photosynthesis of the plant is 30g 2 The discharge amount of the gas is 8.57 percent of the gas discharge amount of the traditional sewage treatment technology. Compared with the traditional sewage treatment technology, the embodiment reduces the carbon emission by 97.14% by adopting a sewage ecological treatment system, a solar power supply system and the like, and basically achieves the aim of nearly zero carbon.
3. By improving and optimizing the water inlet and distribution mode, hydraulic load and treatment flow, the dissolved oxygen level of the substrate is effectively controlled, the periodic change of the oxygen-enriched-anoxic-anaerobic environment in the treatment unit is realized, the synchronous nitrification and denitrification efficiency is improved, the stable and durable removal of phosphorus is promoted, the growth of a biological membrane on the surface of the substrate is reasonably controlled to avoid blockage, the synchronous denitrification and dephosphorization efficiency of the system is further improved, and the stable operation of the ecological treatment process is ensured.
4. The scavenging pump can be adjusted according to the oxygen concentration in the light-transmitting cover to control the carbon emission amount in the plant pond, the time of different stages of sewage treatment in the filtering and purifying layer is further controlled by combining the oxygen content, near zero emission is realized in an optimal mode, and meanwhile, the solar energy system is a zero-emission power system, so that the near zero emission is realized.
The above-mentioned embodiments, objects, technical solutions and advantages of the present application are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present application should be included in the scope of the present application.

Claims (10)

1. The utility model provides a nearly zero carbon sewage ecological treatment system which characterized in that includes:
the solar power supply system is used for providing electric energy for the operation of the system;
the sewage ecological treatment system comprises a sewage ecological treatment pool, a plant carbon fixation purification pool and a recycling pool;
the sewage ecological treatment pool comprises a water distribution layer, a filtering and purifying layer, a water storage layer and a sludge discharge layer which are arranged from top to bottom, wherein the water distribution layer is connected with a sewage source through a water distribution device, and the water storage layer is connected with a reuse pool through a drainage device;
be equipped with the solid carbon-layer of plant in the solid carbon purification pond of plant, the solid carbon-layer of plant is located the top of water distribution layer, and the top cover on the solid carbon-layer of plant is equipped with the printing opacity cover, plants the clean carbon plant in the enclosure space that the printing opacity cover formed.
2. The ecological treatment system for sewage containing nearly zero carbon of claim 1, further comprising an air interchanger and an exhaust gas collecting device, wherein the air interchanger and the exhaust gas collecting device are both communicated with the closed space of the light-transmitting cover, and an oxygen concentration sensor is arranged in the closed space of the light-transmitting cover;
the ventilation device is used for supplying air into the closed space of the light-transmitting cover when the oxygen concentration in the closed space is low;
the waste gas collecting device is used for discharging and collecting waste gas generated in the plant carbon fixation purifying pond.
3. The ecological treatment system for sewage water with near zero carbon of claim 2, further comprising a control and display system, wherein the control and display system is configured to control the water distribution device to replenish the water level in the water distribution layer to H1 in T2 time when the water level in the water distribution layer is lowered from H1 to H2 in T1 time;
H2=H1-V/S，T2=0.13~0.16T3；
in the above formula: h1 is the highest water distribution level (m);
h2 is the lowest water distribution level (m);
v is the sewage treatment capacity (m) in a single purification treatment period of the system 3 ）；
S is the system water distribution area (m) 2 ）；
T1 is the running time of a single decontamination processing period of the system;
t2 is the water distribution time of a single purification treatment period of the system;
t3 is the total time from the time when the water level in the water distribution layer reaches H1 to the time when the oxygen concentration in the plant carbon fixation purification tank reaches C1, and C1 is 13-14.8% vol.
4. The ecological treatment system for sewage water with near zero carbon as claimed in claim 3, wherein the control and display system is further configured to start the operation of the air interchanger when the oxygen concentration in the plant carbon sequestration purification tank reaches C1, to introduce air into the plant carbon sequestration layer through the air output pipe of the air interchanger, and to discharge and collect the waste gas inside through the waste gas exhaust pipe of the waste gas collection device; when the oxygen concentration value in the plant carbon fixation layer is C2, the ventilation device stops working, wherein C2= 1.3-1.7C 1.
5. The ecological treatment system for sewage water with near zero carbon of claim 1, wherein the filtering and purifying layer comprises a primary purifying layer and a secondary purifying layer arranged from top to bottom;
wherein, the first-stage purification layer is filled with shale ceramic particles, and the second-stage purification layer is filled with composite active alumina particles.
6. The ecological sewage treatment system with near-zero carbon content of claim 1, wherein the drainage device comprises a drainage pipe and a drainage pump arranged on the drainage pipe, wherein a liquid inlet of the drainage pipe is positioned in the water storage layer, and a liquid outlet of the drainage pipe is connected into the recycling tank.
7. The ecological treatment system for sewage water with near zero carbon of claim 1, wherein the sludge discharge layer is connected with a sludge discharge device for discharging sludge;
the sludge discharge device comprises a sludge discharge pipe and a sludge discharge pump arranged on the sludge discharge pipe.
8. The ecological sewage treatment system with near-zero carbon content of claim 1, further comprising a pretreatment tank and a regulation tank, wherein the regulation tank is arranged upstream of the ecological sewage treatment tank through a pipeline, the pretreatment tank is arranged upstream of the regulation tank through a pipeline, the pretreatment tank is connected with an upstream sludge tank through a pipeline, and the sludge tank is connected with an upstream sewage source.
9. An ecological treatment method of near-zero carbon sewage, which is characterized in that the ecological treatment system of near-zero carbon sewage of any one of claims 1 to 8 is utilized.
10. The ecological treatment method of near-zero carbon sewage according to claim 9, characterized in that the method comprises the following steps:
building a solar power supply system and a sewage ecological treatment system;
the domestic sewage is fed into a sewage ecological treatment system for purification treatment, and the purified sewage is discharged into a reuse pool for water supply;
the domestic sewage entering the sewage ecological treatment system firstly enters a sediment tank, large-particle impurities are settled under the action of gravity, then enters a pretreatment tank, is filtered by a filtering component in the pretreatment tank, and overflows to an adjusting tank;
when the regulating tank reaches a preset water level, the water distribution pump is started, sewage in the regulating tank is supplied into the water distribution layer through the water distribution pipe, and the sewage is distributed into the sewage ecological treatment tank from top to bottom in the water distribution layer; sewage in the water distribution layer sequentially enters a primary purification layer and a secondary purification layer, pseudomonas stutzeri is added in the sewage ecological treatment tank, the sewage treated by the secondary purification layer enters a water storage layer and is supplied to a reuse tank through a drainage device for water supply;
in the process of sewage purification treatment, the carbon-purifying plants adsorb organic matters such as nitrogen, phosphorus and the like in the sewage, and absorb CO generated in the process of sewage treatment through photosynthesis 2 A gas.
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