CN107998874B - Constructed wetland VOCs waste gas purification method and system - Google Patents

Constructed wetland VOCs waste gas purification method and system Download PDF

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CN107998874B
CN107998874B CN201711376456.8A CN201711376456A CN107998874B CN 107998874 B CN107998874 B CN 107998874B CN 201711376456 A CN201711376456 A CN 201711376456A CN 107998874 B CN107998874 B CN 107998874B
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董婵
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Nanjing Polytechnic Institute
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Abstract

The invention relates to a constructed wetland VOCs waste gas purification method and a system, wherein a main functional area of the system comprises a moisture saturated packing layer and a moisture unsaturated packing layer, VOCs gas firstly enters the saturated packing layer through a gas distribution device, the layer of packing and a biological membrane attached to the surface of the layer of packing are completely immersed in sewage, and the degradation mechanism of the VOCs waste gas follows the absorption-biological membrane theory; then VOCs gas enters the unsaturated packing layer, and the removal of pollutants accords with the theory of adsorption-biological membrane. Finally, the purified gas is discharged out of the wetland system from the top. Sewage uniformly enters the medium from the water distribution area through the perforated plate and flows horizontally, nutrient elements are provided for the biomembrane attached to the packing layer, healthy and stable life activities of the biomembrane are maintained, and finally the sewage is discharged out of the system through the water outlet device. The method and the system can purify the VOCs waste gas with low concentration, no recovery value and serious environmental pollution generated in industrial production, building materials and transportation with high efficiency.

Description

Constructed wetland VOCs waste gas purification method and system
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to a biological ecological treatment technology capable of treating Volatile Organic Compounds (VOCs), namely an artificial wetland VOCs waste gas treatment process.
Background
With the rapid development of economy, the pollution problem of Volatile Organic Compounds (VOCs) is increasingly serious, the VOCs are not only various, but also most toxic, and have carcinogenic, teratogenic and mutagenic effects, and especially benzene, toluene and xylene can cause great harm to human health. Besides the hazards of VOCs, secondary pollution is also easily caused. In urban or industrial dense areas, VOCs and nitrogen oxides in air and O, O in free atmospheric state are irradiated by ultraviolet rays3OH and HO2And the like, to generate photochemical smog. VOCs can react with particles in the air under specific conditions to form secondary organic aerosols containing a large number of triorganically effective organic compounds, such as polychlorinated biphenyls,Polycyclic aromatic hydrocarbons and other halogenated organic matters and the like, and can be transmitted in long distance, thereby affecting the global environment. Volatile Organic Compounds (VOCs) can destroy the ozone layer, cause haze weather, generate photochemical smog and are very harmful to human health, and particularly low-concentration VOCs are not easy to pay attention to, so that people generate chronic poisoning and canceration to endanger life. All countries in the world strictly control emission through legislation, and simultaneously continuously research and develop new VOCs treatment technology.
At present, VOCs treatment technologies are various, and are mainly divided into a chemical oxidation method, a physical separation method, a photolysis method, a low-temperature plasma method, a biological method and the like according to the basic principle. (1) The chemical oxidation method is mostly applied to a combustion method, and is suitable for volatile organic waste gas with high concentration and difficult recycling, but if the waste gas cannot be fully mixed and combusted with air, harmful components such as dioxin and the like are contained in a product, secondary pollution is caused, and concentration pretreatment is needed when low-concentration organic waste gas cannot be directly combusted. On the basis, a small amount of combustion auxiliary agent is added to ensure that the regenerative combustion method is gradually mature, the energy consumption is low, the treatment efficiency reaches 99 percent, but when organic waste gas with complex components is treated, catalyst poisoning is easily caused, the treatment effect is reduced, and the catalyst is generally noble metal and has higher cost. (2) The physical separation method can recycle the separated organic matters, however, when the condensation method is used for treating the low-concentration organic waste gas, concentration treatment is needed, the manufacturing and operating costs of the membrane separation method are high, the adsorbent needs to be continuously replaced by the adsorption method, the operating cost is increased, and secondary pollution is easily caused in the desorption process. Most of the absorbent of the absorption method has certain toxic and polluting organic solvents, and secondary pollution is generated in the subsequent absorption process. (3) The photolysis process is a new technology for treating various organic compounds which are difficult to degrade and have low concentration, but is not suitable for large-scale industrial application because the catalyst loses activity when the accumulation of organic compounds on the surface of the catalyst is too high. (4) The desulfurization and denitration reaction of the low-temperature plasma method can avoid the final product SO2、NO2Secondary pollution of (2). However, if the conditions are not well controlled, the corresponding product is unstable.
The invention saturates the VOCs in the artificial wetlandUnsaturated filtering medium attached with biological membrane, organic matter as energy substance participating in metabolism of microorganism and being decomposed into CO2And H2O, etc., thereby achieving the purpose of purifying exhaust gas. The constructed wetland waste gas treatment system belongs to an environment-friendly technology, is more suitable for treating low-concentration VOCs waste gas compared with the traditional method, and has the characteristics of low investment and operation cost, simple maintenance and management, no secondary pollution and the like.
Disclosure of Invention
The invention aims to provide an improved constructed wetland treatment technology capable of treating low-concentration VOCs waste gas, wherein main pollutants comprise total hydrocarbons, benzene, toluene, ethylbenzene, xylene, phenol and the like, and the purpose of improving the quality of atmospheric environment and protecting human health is achieved. The constructed wetland not only can purify the waste gas of the low-concentration VOCs, but also has a certain ecological landscape function, and can provide places for people to have leisure and entertainment.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
an artificial wetland VOCs waste gas purification system comprises an artificial wetland tank body, a filler, a water inlet device, a water outlet device, a gas distribution device and aquatic plants; the artificial wetland pool body is divided into a filler area and a water distribution area in the horizontal direction, the filler area and the water distribution area are separated by a perforated plate, and the water distribution area is provided with a water inlet device; the filler area is filled with fillers, and the filler area is sequentially provided with a moisture saturated filler layer and a moisture unsaturated filler layer from bottom to top in the vertical direction, wherein the filler layer immersed in water is the moisture saturated filler layer, and the pore spaces which are not filled with water are the moisture unsaturated filler layers; aquatic plants are planted above the moisture unsaturated packing layer; the filler area is provided with a first water outlet device and a second water outlet device, the first water outlet device is arranged at the top of the moisture unsaturated filler layer, and the second water outlet device is arranged at the top of the moisture saturated filler layer; and an air distribution device is laid at the bottom of the moisture saturated packing layer in the packing area, VOCs waste gas enters the bottom of the moisture saturated packing layer through the air distribution device, and purified gas is discharged from the top of the packing area after being purified in the packing area.
The main functional area of the system comprises a moisture saturated packing layer and a moisture unsaturated packing layer, VOCs gas firstly enters the saturated packing layer through a gas distribution device, the packing of the layer and a biological membrane attached to the surface of the packing are completely immersed in sewage, and the degradation mechanism of VOCs waste gas follows the absorption-biological membrane theory; then VOCs gas enters the unsaturated packing layer, and the removal of pollutants accords with the theory of adsorption-biological membrane. Finally, the purified gas is discharged out of the wetland system from the top. Sewage uniformly enters the medium from the water distribution area through the perforated plate and flows horizontally, nutrient elements are provided for the biomembrane attached to the packing layer, healthy and stable life activities of the biomembrane are maintained, and finally the sewage is discharged out of the system through the water outlet device.
Further, the gas distribution device comprises a gas distribution main pipe, a gas distribution branch pipe and a pipe plug; the air distribution trunk pipe extends at the bottom of the moisture saturated packing layer and is used for air inlet; the gas distribution branch pipes are symmetrically distributed on two sides of the gas distribution main pipe body, one end of each gas distribution branch pipe is vertically connected with the gas distribution main pipe body, and the other end of each gas distribution branch pipe is provided with a pipe plug.
Furthermore, the gas distribution branch pipe consists of a supporting pipe, a rubber gas distribution membrane pipe and a hoop; the supporting tube is vertically connected with the gas distribution main pipe body, the outer surface of the supporting tube is wrapped with the rubber gas distribution membrane tube, and two ends of the supporting tube wrapped with the rubber gas distribution membrane tube are locked by using hoops; a groove is formed in the tube body of the supporting tube; the surface of the rubber gas distribution membrane tube is provided with micropores which are opened under the action of gas pressure. Through improving the surface structure of stay tube, set up the recess on the surface of stay tube body along stay tube axis of ordinates direction, gaseous can directly get into the air passage of stay tube surface recess from the gas distribution main pipe to but the resistance loss of greatly reduced air. The micropores on the surface of the membrane tube can realize uniform gas distribution. When the artificial wetland is in work, the micropores of the rubber air distribution membrane tube can automatically open under the air pressure, and VOCs waste gas enters the artificial wetland; when the gas distribution is stopped, the micropores are closed under the action of the sewage pressure, so that the sewage is prevented from entering the gas distribution device to block the holes, and therefore, the defects of hole blocking, contamination and the like are avoided. Meanwhile, VOCs waste gas entering the gas distribution device does not need to be subjected to dust removal and purification, and sewage cannot flow backwards when gas inlet is stopped.
Furthermore, the first water outlet device, the second water outlet device and the water inlet device are water pipes; the first water outlet device, the second water outlet device, the water inlet device and the air distribution main pipe are positioned on the same vertical plane.
Furthermore, the filler is volcanic cinders. The filler is a carrier of the biological membrane, plays a role in intercepting and adsorbing VOCs, is a key part of an artificial wetland system, and directly influences the treatment effect. Meanwhile, the cost of the artificial wetland is higher in the construction of the improved artificial wetland system, so that the selection of proper filler is related to the economic rationality of the improved artificial wetland technology. The filler selected by the invention is volcanic cinders, the volcanic cinders have porous surfaces, large specific surface area and good water flow state, are beneficial to exerting mass transfer effect, have certain biological adhesive force, stable chemical and physical properties, are durable, have sufficient sources of goods, are low in price, are convenient to transport, construct and install, and have detailed chemical compositions shown in table 1.
TABLE 1 chemical composition and percentage content of volcanic cinders
Figure BDA0001514663920000031
Furthermore, the artificial wetland pool body is formed by excavating earthwork below the ground, and clay is tamped on the inner wall to be used as an impermeable layer.
Further, the aquatic plant is selected from reed leaves, and the planting density is 20 plants/m2。
Another object of the present invention is to provide a method for using the above system, comprising the steps of:
(1) injecting the inoculated sludge into the constructed wetland tank body (1), and injecting artificially prepared nutrient solution and phosphate buffer solution into the constructed wetland tank body (1) through a water inlet device (31) to be mixed;
(2) pumping domestic sewage into the artificial wetland tank body (1), then injecting tap water, and adjusting the pH value of a water body in the artificial wetland tank body (1) to be 6.5-7.5 and the temperature to be 15-40 ℃; injecting air into the artificial wetland pool body (1); the film forming process is completed by detecting the COD change of the water body and manually observing the film forming condition;
(3) in the normal operation process, VOCs waste gas is input from a gas distribution main pipe (51) of the system, enters a gas distribution branch pipe (52), enters a moisture saturated packing layer (22) through the gas distribution branch pipe (52), meanwhile, domestic sewage is continuously input into the artificial wetland tank body (1) from a water inlet device (31), and then continuously flows out from a second water outlet device (42);
(4) and regularly monitoring the pH value and the temperature of the water body, keeping the pH value stable within the range of 6.5-7.5, and keeping the temperature stable within the range of 15-40 ℃.
Further, the method further comprises: further comprising: periodically raising the water level; the method comprises the following steps:
(1) closing the second water outlet device (42) and keeping continuous water inlet until the first water outlet device (41) discharges water;
(2) stopping water inflow, and enabling the sewage to immerse the whole packing layer for 30 min;
(3) the second water outlet device (42) is opened to discharge water until water outlet is stopped, and continuous water inlet is restarted;
(4) repeating the operation for one period every day by taking the (1) to (3) as one period.
Further, the mass ratio of the artificially prepared nutrient solution C to N to P is 100:2: 1; the components are as follows: 800mg/L of glucose, 50mg/L of urea, 150mg/L of dipotassium phosphate, 225mg/L of magnesium sulfate, 275mg/L of calcium chloride and 25mg/L of ferrous sulfate;
the phosphate buffer solution comprises the following components in percentage by weight: k2HPO4∙H2O 0.11g/L，Na2HPO4∙12H2O 0.16g/L，KH2PO40.04g/L，NH4Cl 0.025g/L。
The constructed wetland waste gas purification system and the method can utilize domesticated microorganisms to metabolize and decompose VOCs, and can efficiently purify low concentration (inlet gas concentration is generally 500-1000 mg/m-3) The VOCs waste gas which has no recycling value and seriously pollutes the environment eliminates the adverse effect of volatile organic compounds, improves the quality of atmospheric environment and protects the health of people. The invention has the advantages of good treatment effect, low energy consumption, low investment and operationLow cost, simple operation and maintenance, no secondary pollution, beautifying environment and the like.
Drawings
FIG. 1 is a general structure diagram of an artificial wetland system;
FIG. 2 is a top plan view of FIG. 1;
FIG. 3 is a detailed view of a tubular microporous gas distributor;
the dimensions in the figure are in mm.
Detailed Description
The technical scheme of the invention is further described in the following description in combination with the accompanying drawings.
Example 1
This embodiment specifically illustrates the technical solution of the system of the present invention.
The constructed wetland VOCs waste gas purification system shown in the figures 1-3 comprises an constructed wetland tank body 1, a filler, a water inlet device, a water outlet device, a gas distribution device 5 and aquatic plants 6; the artificial wetland pool body 1 is formed by excavating earthwork below the ground, and clay is tamped on the inner wall to be used as an impermeable layer; the artificial wetland pool body 1 is divided into a packing area 2 and a water distribution area 3 in the horizontal direction, the packing area 2 and the water distribution area 3 are separated by a perforated plate 7, and the water distribution area 3 is provided with a water inlet device 31; the filler area 2 is filled with fillers, and the filler area 2 is sequentially provided with a moisture saturated filler layer 22 and a moisture unsaturated filler layer 21 from bottom to top in the vertical direction; aquatic plants 6 are planted above the packing layers 21 and 22, and the root systems of the plants 6 in water depth extend to the water unsaturated packing layer 21; the filler area is provided with a first water outlet device 41 and a second water outlet device 42, the first water outlet device 41 is arranged at the top of the moisture unsaturated filler layer 21, and the second water outlet device 42 is arranged at the top of the moisture saturated filler layer 22; and an air distribution device 5 is laid at the bottom of the water saturation packing layer 21 of the packing area, VOCs waste gas enters the bottom of the water saturation packing layer 22 through the air distribution device 5, and purified gas is discharged from the top of the packing area 2 after being purified by the packing area 2.
The gas distribution device 5 comprises a gas distribution main pipe 51, a gas distribution branch pipe 52 and a pipe plug 53; the air distribution trunk pipe 51 extends at the bottom of the moisture saturated packing layer 21 and is used for air inlet; the plurality of gas distribution branch pipes 52 are symmetrically distributed on two sides of the gas distribution main pipe 51, one end of each gas distribution branch pipe is vertically connected with the pipe body of the gas distribution main pipe 51, and the other end of each gas distribution branch pipe is provided with a pipe plug 53.
The air distribution branch pipe 52 consists of a support pipe 521, a rubber air distribution membrane pipe 522 and an anchor ear 523; the supporting pipe 521 is vertically connected with the pipe body of the air distribution main pipe 51, the outer surface of the supporting pipe 521 is wrapped with the rubber air distribution membrane pipe 522, and two ends of the supporting pipe 521 wrapped with the rubber air distribution membrane pipe 522 are locked by using anchor ears 523; a groove is formed in the pipe body of the supporting pipe 521; micropores are formed in the surface of the rubber gas distribution membrane tube 522 and are opened under the action of gas pressure; when the gas distribution is stopped, the micropores are closed under the action of the sewage pressure, so that the sewage is prevented from entering the gas distribution device 5 to block the holes.
The first water outlet device 41, the second water outlet device 42 and the water inlet device 31 are water pipes; the first water outlet device 41, the second water outlet device 42, the water inlet device 31 and the air distribution main pipe 51 are positioned on the same vertical plane.
In the embodiment, the filler is volcanic cinders; the scoria component comprises 64.77 percent of SiO2；15.47％Al2O3；8.99％Fe2O3；7.75％CaO；0.66％MgO；0.47％SO2(ii) a 0.88% loss on ignition; the aquatic plant 6 is selected from folium Phragmitis with planting density of 20 plants/m2。
Example 2
This example illustrates the method of use of the system described in example 1.
In this embodiment, the system structure and size are specifically shown in fig. 1, and the tank body: the tank body of the artificial wetland is rectangular (round, square or irregular shape can be adopted as the actual one) on the plane, the thickness of the impervious layer is 0.05m, and the compactness is 97 percent; the height of the filling in the pool is 1.0m, the height of the saturated water layer at the bottom is 0.7m, the height of the unsaturated layer at the top is 0.3cm, the height is 0.3m, and the total height is 1.3 m.
The service area of the gas distribution device in the embodiment is 0.3-1.5m2Per m, ventilation volume 1-10m3The/m ∙ h, the air hole density of 15000-.
The system operating parameters were as follows:
the particle size of the medium volcanic cinders is 2-3 cm;
air inlet flow rate of 100 and 200m3/h；
Intake air concentration 500-3；
The gas retention time is 25-50 s;
the average organic load rate is 10-15 g/(m)3∙h)；
The mass ratio of C to N to P in the sewage is 100:2: 1;
the hydraulic load of the nutrient water is 0.3m3/m2∙ d; the organic load of the nutrient water is 0.06kgCOD/m2∙d；
The purification efficiency is 90% -98%;
biomass 8-10kgMicroorganisms/m3；
The pH value is 6.5-7.5; the temperature is 15-40 ℃;
(1) injecting inoculated sludge into the constructed wetland tank body 1, wherein the MLSS of the inoculated sludge is 2000mg/L, the inoculated sludge contains microorganisms, and the biomass is 8-10kgMicroorganisms/m3Artificially prepared nutrient solution and phosphate buffer solution are injected into the constructed wetland pool body 1 through a water inlet device 31, wherein the mass ratio of C to N to P is 100:2:1, and the nutrient solution comprises the following components: 800mg/L of glucose, 50mg/L of urea, 150mg/L of dipotassium hydrogen phosphate, 225mg/L of magnesium sulfate, 275mg/L of calcium chloride and 25mg/L of ferrous sulfate; the buffer solution has a ratio of K2HPO4∙H2O 0.11g/L、Na2HPO4∙12H2O 0.16g/L、KH2PO40.04g/L、NH4Cl0.025g/L；
(2) Pumping domestic sewage into the artificial wetland tank body 1, injecting tap water for dilution, and adjusting the pH value of a water body in the artificial wetland tank body 1 to be 6.5-7.5 at the temperature of 15-40 ℃; injecting air into the artificial wetland tank body 1, performing aeration to ensure that microorganisms in the sludge quickly grow and propagate under the conditions of sufficient nutrition and proper environmental factors to form a biological membrane, and completing the membrane hanging process by detecting the COD (chemical oxygen demand) change of a water body and manually observing the membrane hanging condition;
the specific conditions in this example are as follows:
pumping the domestic sewage with about 1/3 tank volume into the artificial wetland tank body 1, and then injecting tap waterDiluting, adjusting the pH value of the water body in the artificial wetland tank body 1 to 6.5-7.5 and the temperature to 15-40 ℃; air is injected into the artificial wetland tank body 1 at the air inlet flow rate of 50m3H, inlet gas concentration 300mg/m3After the conditions are met, the domestic sewage is supplemented after 8 hours of inflation. And (4) aeration is carried out for 1d, a proper amount of nutrient buffer solution is added every 8h, and the sewage in the 1/3 tank is replaced. Generally, a very thin film can be seen on the surface of the filler after 3-5 days, if the microorganisms are normally proliferated, the water quantity can be increased to 1/3-1/2 of the tank volume, the water quantity can be treated according to the designed water quantity after about 10 days, and microscopic examination shows that the fixed ciliates are on the biological film, and the zoogloea is good in growth. And finishing the film forming process of the wetland system.
(3) In the normal operation process, VOCs waste gas is input from a gas distribution main pipe 51 of the system, enters a gas distribution branch pipe 52, enters a moisture saturated packing layer 22 through the gas distribution branch pipe 52, meanwhile, domestic sewage continuously flows into the artificial wetland tank body 1 from a water inlet device 31, and then continuously flows out from a second water outlet device 42;
specifically, VOCs waste gas is input from the gas distribution main pipe 51, and the air inlet flow rate is 200m3H, intake gas concentration 500mg/m3Uniformly enters the moisture saturated packing layer 22 through the gas distribution branch pipe 52, and finally purified gas is discharged out of the wetland system from the top; meanwhile, domestic sewage is continuously fed from the water inlet device 31, and the hydraulic load is 0.3m3/m2∙ d; the organic load was 0.06kgCOD/m2∙ d, and then the domestic sewage is continuously discharged from the second water discharging device 42.
(4) And regularly monitoring the pH value and the temperature of the water body, keeping the pH value stable within the range of 6.5-7.5, and keeping the temperature stable within the range of 15-40 ℃.
In this embodiment, in order to keep the biofilm in the unsaturated packing layer moist, the water level needs to be raised periodically.
The method comprises the following steps:
(1) closing the second water outlet device 42 and keeping continuously feeding water until the first water outlet device 41 discharges water;
(2) stopping water inflow, and enabling the sewage to immerse the whole packing layer for 30 min;
(3) the second water outlet device 42 is opened to drain water until water outlet is stopped, and continuous water inlet is restarted;
(4) repeating the operation for one period every day by taking the (1) to (3) as one period.

Claims (7)

1. An artificial wetland VOCs waste gas purification system comprises an artificial wetland tank body (1), a filler, a water inlet device, a water outlet device, a gas distribution device (5) and aquatic plants (6);
the artificial wetland pool body (1) is divided into a filler area (2) and a water distribution area (3) in the horizontal direction, the filler area (2) and the water distribution area (3) are separated by a perforated plate (7), and the water distribution area (3) is provided with a water inlet device (31) for injecting sewage to be treated;
the filler area (2) is filled with filler, and a biological film is attached to the surface of the filler; the filling area (2) is sequentially provided with a moisture saturated filling layer (22) and a moisture unsaturated filling layer (21) from bottom to top in the vertical direction; wherein the filler layer immersed in water is a moisture saturated filler layer, and the pores which are not filled with water are moisture unsaturated filler layers; aquatic plants (6) are planted above the filler layers (21, 22);
the packing area is provided with a first water outlet device (41) and a second water outlet device (42), the first water outlet device (41) is arranged at the top of the moisture unsaturated packing layer (21), and the second water outlet device (42) is arranged at the top of the moisture saturated packing layer (22);
a gas distribution device (5) is laid at the bottom of the water saturated packing layer (22) in the packing region, VOCs waste gas enters the bottom of the water saturated packing layer (22) through the gas distribution device (5), and purified gas is discharged from the top of the packing region (2) after being purified by the packing region (2);
the gas distribution device (5) comprises a gas distribution main pipe (51), a gas distribution branch pipe (52) and a pipe plug (53);
the air distribution main pipe (51) extends at the bottom of the moisture saturated packing layer (22) and is used for air inlet;
the gas distribution branch pipes (52) are symmetrically distributed on two sides of the pipe body of the gas distribution main pipe (51), one end of each gas distribution branch pipe is vertically connected with the pipe body of the gas distribution main pipe (51), and the other end of each gas distribution branch pipe is provided with a pipe plug (53);
the system is used as follows:
(1) injecting the inoculated sludge into the constructed wetland tank body (1), and injecting artificially prepared nutrient solution and phosphate buffer solution into the constructed wetland tank body (1) through a water inlet device (31);
(2) pumping domestic sewage into the artificial wetland tank body (1), then injecting tap water, and adjusting the pH value of a water body in the artificial wetland tank body (1) to be 6.5-7.5 and the temperature to be 15-40 ℃; injecting air into the artificial wetland pool body (1); the film forming process is completed by detecting the COD change of the water body and manually observing the film forming condition;
(3) in the normal operation process, VOCs waste gas is input from a gas distribution main pipe (51) of the system, enters a gas distribution branch pipe (52), enters a moisture saturated packing layer (22) through the gas distribution branch pipe (52), meanwhile, domestic sewage is continuously input into the artificial wetland tank body (1) from a water inlet device (31), and then continuously flows out from a second water outlet device (42);
(4) regularly monitoring the pH value and the temperature of the water body, keeping the pH value stable within the range of 6.5-7.5, and keeping the temperature stable within the range of 15-40 ℃;
the using process also comprises periodically raising the water level; the method comprises the following steps:
a. closing the second water outlet device (42) and keeping continuous water inlet until the first water outlet device (41) discharges water;
b. stopping water inflow, and enabling the sewage to immerse the whole packing layer for 30 min;
c. the second water outlet device (42) is opened to discharge water until water outlet is stopped, and continuous water inlet is restarted;
d. and repeating the operation for one period every day by taking a-c as one period.
2. The system according to claim 1, characterized in that the gas distribution manifold (52) consists of a support tube (521), a rubber gas distribution membrane tube (522) and an anchor ear (523);
the supporting pipe (521) is vertically connected with a pipe body of the air distribution main pipe (51), the outer surface of the supporting pipe (521) is wrapped with the rubber air distribution membrane pipe (522), and the rubber air distribution membrane pipe (522) and the supporting pipe (521) are locked by using hoops (523) at two ends;
a groove is arranged on the pipe body of the supporting pipe (521);
the surface of the rubber gas distribution membrane tube (522) is provided with micropores which are opened under the action of gas pressure to realize uniform gas distribution.
3. The system according to claim 1, characterized in that the first water outlet means (41), the second water outlet means (42) and the water inlet means (31) are water pipes; the first water outlet device (41), the second water outlet device (42), the water inlet device (31) and the air distribution main pipe (51) are positioned on the same vertical plane.
4. The system of claim 1, wherein the filler is volcanic cinders; the scoria component comprises 64.77 percent of SiO2；15.47% Al2O3；8.99% Fe2O3；7.75% CaO；0.66% MgO；0.47% SO2(ii) a 0.88% loss on ignition.
5. The system according to claim 1, wherein the artificial wetland tank body (1) is formed by excavating earthwork below the ground, and clay is tamped in the inner wall as an impermeable layer.
6. The system according to claim 1, wherein the aquatic plant (6) is reed leaves with a planting density of 20 plants/m2。
7. The system of claim 1, wherein the artificially prepared nutrient solution has a mass ratio of C: N: P of 100:2: 1; the components are as follows: 800mg/L of glucose, 50mg/L of urea, 150mg/L of dipotassium phosphate, 225mg/L of magnesium sulfate, 275mg/L of calcium chloride and 25mg/L of ferrous sulfate;
the phosphate buffer solution comprises the following components in percentage by weight: k2HPO4∙H2O 0.11g/L，Na2HPO4∙12H2O 0.16g/L，KH2PO40.04g/L，NH4Cl 0.025g/L。
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