1. The utility model provides an aerobic composting strengthens horizontal undercurrent constructed wetland denitrification device which characterized in that: comprises an aerobic composting unit and a horizontal subsurface flow constructed wetland unit;

the aerobic composting unit comprises an intelligent gas supply device (1), a composting reactor (2) and an intelligent aeration device (22);

the intelligent gas supply equipment (1) is connected with a gas inlet of the composting reactor (2), and a gas outlet of the composting reactor (2) is connected with at least one aeration pipe (7) of the horizontal subsurface flow constructed wetland unit;

the intelligent aeration equipment (22) comprises a nitrogen concentration detection component (12) and a dissolved oxygen concentration detection component (3) which are arranged on the horizontal subsurface flow constructed wetland, and an oxygen concentration detection component (3) and a temperature detection component (4) which are arranged on the compost reactor (2).

2. The aerobic compost enhanced horizontal subsurface flow constructed wetland denitrification device according to claim 1, wherein the horizontal subsurface flow constructed wetland unit comprises an impermeable layer (17), a substrate layer and a vegetation layer (10) from bottom to top in sequence; the matrix layer comprises a coarse sand layer (6), a filler layer (13) and a soil layer (20); the soil layer comprises a layer of nitrification soil (14) and a layer of denitrification soil (18); the pH value of the nitrification soil layer is 7.0-8.0, and the pH value of the denitrification soil layer is 6.5-7.5.

3. The aerobic compost enhanced horizontal subsurface flow constructed wetland denitrification device as claimed in claim 2, wherein the filler layer (13) is of a drawer type structure; the filler of the filler layer is zeolite.

4. The aerobic composting enhanced horizontal subsurface flow constructed wetland denitrification device of claim 3, wherein the zeolite is subjected to an activation treatment, and the activation treatment step comprises:

(1) natural zeolite is put into H with the mass fraction of 5 to 10 percent₂O₂Soaking the solution for 2-3 h, taking out and draining;

(2) roasting the zeolite at the temperature of 300-400 ℃ for 3-6 h;

(3) quickly putting the zeolite obtained in the step (2) into a NaCl solution with the mass fraction of 5% -10% for quenching and soaking for 1-2 h, then carrying out ultrasonic treatment in the soaking solution, washing the zeolite at least once with clear water after the ultrasonic treatment is finished, carrying out ultrasonic treatment in ionized water after the washing, taking out the zeolite and draining;

(4) and (4) carrying out microwave drying on the zeolite obtained in the step (3) to obtain activated zeolite.

5. The aerobic compost enhanced horizontal subsurface flow constructed wetland denitrification device according to claim 2, wherein the coarse sand layer (6) is communicated with an aeration pipe (7); the aeration pipe (7) is of a net structure or a disc structure, uniform vertical downward air distributing openings (15) are distributed in the aeration pipe (7), and filter screens are arranged on the air distributing openings (15).

6. The aerobic compost enhanced horizontal subsurface flow constructed wetland denitrification device according to claim 1, wherein the horizontal subsurface flow constructed wetland unit comprises a water distribution zone (9), a nitrification zone, a denitrification zone and a water collection zone (19); the nitrification area is an aeration area for the compost waste gas to enter the horizontal subsurface flow constructed wetland; the nitrification region and the denitrification region are separated by a partition plate (21); the position of the water inlet (8) of the water distribution area (9) is higher than the position of the water outlet (16) of the water collection area (19) in the vertical direction.

7. The aerobic compost enhanced horizontal subsurface flow constructed wetland denitrification device according to claim 6, wherein the nitrification region is provided with a dissolved oxygen concentration detection component (3) and a nitrogen detection component (12), wherein the nitrogen detection component (12) is arranged at the junction of a nitrification soil layer (14) and a denitrification soil layer (18) at the top end of the partition plate (21); the concentration range of dissolved oxygen in the nitrification region is 2-3 mg/L, NH₄ ⁺Concentration of<35 mg/L; a water outlet (16) NH of the water collecting area (19)₄ ⁺Concentration of<5 mg/L。

8. The aerobic composting enhanced horizontal subsurface flow constructed wetland denitrification device of claim 1 wherein the composting reactor (2) comprises a stirrer (5); the stirrer (5) is connected with an intelligent aeration device (22); the intelligent aeration equipment (22) is connected with the intelligent gas supply equipment (1).

9. The aerobic composting enhanced horizontal subsurface flow constructed wetland denitrification plant of claim 8, wherein the temperature in the composting reactor (2) ranges from room temperature to 65 ℃; the oxygen concentration in the composting reactor (2) accounts for 10-15% of the gas mass percentage.

10. A method for denitrification of constructed wetland using the denitrification facility of any one of claims 1 to 9, comprising the steps of:

(1) pumping air into the composting reactor (2) through the intelligent air supply device (1) to supply NH in the composting reactor (2)₃Is carried into an aeration pipe (7); the compost material is stirred by a stirrer (5) in the composting reactor (2);

(2) air and NH in the aeration pipe (7)₃Enters a coarse sand layer of the horizontal subsurface flow constructed wetland from the gas distribution port (15), and is NH₃And O in air₂Dissolving in water to generate NH₄ ⁺；

（3）NH₄ ⁺Into the packing layer (13), part of the NH₄ ⁺Will be adsorbed by the zeolite filler leaving NH₄ ⁺Entering the soil layer;

(4) NH into the soil layer₄ ⁺In the nitrified soil layer (14), a nitration reaction takes place, producing a nitride, a partial nitride and NH which is not converted into a nitride₄ ⁺Absorbed by plants, and the rest part enters a denitrification soil layer (18);

(5) the denitrification soil layer (18) carries out denitrification reaction to reduce N elements in the nitride into N₂The water after reaction enters a water collecting area (19) and is detected and discharged at a water outlet (16);

the nitrogen concentration detection part (12) and the dissolved oxygen concentration detection part (3) of the horizontal subsurface flow constructed wetland monitor the nitrogen concentration and the dissolved oxygen concentration of the nitrification region in real time, and feed information back to the intelligent aeration equipment (22) so as to adjust the intelligent gas supply equipment (1) and the stirrer (5); an oxygen concentration detection component (3) and a temperature detection component (4) which are arranged in the composting reactor (2) monitor the temperature and the oxygen concentration in the composting reactor (2), and information is fed back to the intelligent aeration equipment (22), so that the intelligent gas supply equipment (1) and the stirrer (5) are adjusted;

NH monitored by the nitrogen concentration detection part₄ ⁺When the concentration is more than or equal to 35 mg/L, the filler layer is replaced.

Background

Aerobic composting is a sludge advanced treatment mode widely applied, and harmful substances in sludge are degraded through aerobic microorganism fermentation, so that the sludge is converted into valuable resources. And the product of the aerobic composting of the sludge can be used as a soil conditioner, an organic fertilizer and the like after being qualified through risk assessment. However, the development of the process is limited by the emission of a large amount of malodorous gases during aerobic composting of sludge. It was found that NH₃Is the most malodorous gas discharged in the aerobic composting process of the sludge. High concentration NH in composting plants₃In addition to having a strong sensory impact on the human body, it also poses serious health risks to the eyes, respiratory tract, etc. Thus, NH₃Is a key factor for stink pollution in the aerobic composting process of sludge and treats NH₃Is the key to eliminate the odor pollution. But at the same time NH₃Can be used as the raw material of inorganic nitrogen fertilizer and other resources. If waste NH generated in the sludge aerobic composting process can be generated₃The nitrogen fertilizer can be used as a nitrogen fertilizer, so that the odor pollution can be eliminated, the environmental air quality can be protected, and the resource recycling can be realized.

The artificial wetland is an ecological engineering system which is characterized in that a pool or a groove is constructed artificially, an anti-seepage water-stop layer is laid on the bottom surface of the pool or the groove, a matrix layer with a certain depth is filled, aquatic plants are planted, and the sewage is purified by utilizing the physical, chemical and biological synergistic effects of the matrix, the plants and microorganisms. The water purification function (such as denitrification) of the artificial wetland becomes an important ecological service function of the wetland. In the denitrification process of the artificial wetland, the denitrification process is mainly divided into physical action, chemical action and biological action. The biological action can account for more than 60 percent of the total nitrogen removal, and the biological action mode mainly comprises plant absorption, ammoniation of microorganisms, nitrification/denitrification processes and the like. The artificial wetland is generally divided into a surface flow artificial wetland, a horizontal subsurface flow artificial wetland andthe vertical subsurface flow constructed wetland. The horizontal subsurface flow constructed wetland has the advantages of large hydraulic load and pollution load, small floor area, little stink and little phenomenon of breeding mosquitoes and flies, and the like. However, the oxygen in the horizontal subsurface flow constructed wetland is insufficient, mainly in anoxic and anaerobic environments, the nitrification capability is limited, and the removal of NH in sewage is restricted₄ ⁺The effect of (1).

If the waste gas generated by aerobic composting is introduced into the artificial wetland, the oxygen in the waste gas can increase the content of dissolved oxygen in water, thereby strengthening the nitrification of the artificial wetland and improving the denitrification efficiency. In addition, NH in the exhaust gas₃Form NH after dissolution in water₄ ⁺Can be used as a nitrogen fertilizer to be absorbed and utilized by wetland plants to realize waste NH₄ ⁺And (5) recycling.

No. CN105198085B discloses a parallel horizontal subsurface flow constructed wetland enhanced nitrogen and phosphorus removal system and a method. Mainly comprises a water inlet quantity regulator, a multi-unit parallel horizontal subsurface flow constructed wetland main body and a water outlet level controller. The water level in the horizontal subsurface flow constructed wetland is regulated by the water inlet quantity regulator and the water outlet level controller, the atmospheric reoxygenation performance in the horizontal subsurface flow constructed wetland system is enhanced, the dissolved oxygen level and the microbial activity in the system are improved, and the nitration reaction is promoted. The water treatment amount is stable and sustainable through the parallel configuration of the multi-unit horizontal subsurface flow constructed wetlands. The sewage passes through the enhanced nitrogen removal matrix layer and the enhanced phosphorus removal matrix layer in a front-back sequence, so that the nitrogen and phosphorus removal effect is enhanced, and the reduction of the pollutant removal effect caused by unreasonable matrix filling is avoided. The invention makes up the defects of low dissolved oxygen level and poor denitrification and dephosphorization effects in the horizontal subsurface flow constructed wetland, but is only used in the field of water treatment, can not be applied to the recycling of organic wastes, and can not be applied to the condition of low oxygen content below a certain water level.

Publication No. CN103043865A discloses a reclaimed water treatment system combining an upward flow aeration biological filter and a horizontal subsurface flow constructed wetland. It consists of an upward flow aeration biological filter and a horizontal subsurface flow constructed wetland; the upward flow aeration biological filter comprises a water inlet flow guide pipe positioned at the bottom of the filter, wherein a filter plate, a support layer, an A section filler area, a B section filler area and a water outlet area are sequentially arranged on the water inlet flow guide pipe, and a communicating water pipe is arranged on the water outlet area and is communicated with a regulating tank of the horizontal subsurface flow artificial wetland; the aeration pipe is led out from the bearing layer; the lower layer of the horizontal subsurface flow constructed wetland comprises a regulating tank and a matrix area parallel to the regulating tank, wherein the matrix area sequentially comprises a gravel area, a steel slag area, a zeolite area and a water outlet gravel area from left to right, and a water outlet pipe is arranged in the water outlet gravel area; the upper layer of the horizontal undercurrent artificial wetland is provided with a covering soil layer and aquatic plants. The invention realizes the on-site treatment and utilization of sewage, simplifies the sewage treatment process flow and reduces the operation and management cost. The method is mainly used for water pollution treatment, but does not mention specific sewage treatment effect, and can not realize waste recycling.

Disclosure of Invention

Aiming at a large amount of waste NH generated by the aerobic composting of the sludge at present₃The invention aims to provide a denitrification device for an aerobic compost enhanced horizontal subsurface flow constructed wetland and application thereof, which can realize the purpose of producing waste NH by aerobic compost₃By regulating NH₃The concentration of the water is adjusted, the oxygen content of the nitrification area of the horizontal subsurface flow constructed wetland is adjusted, the nitrification capacity is enhanced, and the denitrification efficiency of the horizontal subsurface flow constructed wetland is enhanced.

The specific technical scheme of the invention is as follows: firstly, the invention provides an aerobic composting reinforced horizontal undercurrent artificial wetland denitrification device, which comprises an aerobic composting unit and a horizontal undercurrent artificial wetland unit;

the aerobic composting unit comprises an intelligent gas supply device, a composting reactor and an intelligent aeration device;

the intelligent gas supply equipment is connected with a gas inlet of the composting reactor, and a gas outlet of the composting reactor is connected with an aeration pipe of at least one horizontal subsurface flow constructed wetland unit;

the intelligent aeration equipment comprises a nitrogen concentration detection component and a dissolved oxygen concentration detection component which are arranged on the horizontal subsurface flow constructed wetland, and an oxygen concentration detection component and a temperature detection component which are arranged on the compost reactor.

The aerobic composting unit comprises intelligent gas supply equipment, a composting reactor and intelligent aeration equipment, wherein the intelligent gas supply equipment is connected with a gas inlet of the composting reactor, and a gas outlet of the composting reactor is connected with an aeration pipe which is introduced into the horizontal subsurface flow constructed wetland unit. The intelligent gas supply equipment is used for providing the amount of gas sent into the composting reactor and further adjusting the oxygen content at the gas outlet of the composting reactor and the gas outlet of the aeration pipe, and the specific method comprises the following steps: the intelligent gas supply device feeds the reactor with larger gas quantity, and the outlet gas quantity has higher oxygen concentration; the smaller the amount of gas fed into the reactor by the intelligent gas supply device, the lower the oxygen concentration of the gas amount at the outlet. The intelligent aeration equipment can adjust parameters of the intelligent gas supply equipment and the reactor through a dissolved oxygen concentration detection part and a water quality nitrogen detection part of the horizontal subsurface flow constructed wetland, and an oxygen concentration detection part and a temperature detection part which are arranged on the composting reactor; in order to improve the efficiency, the air outlet of the composting reactor can be connected with aeration pipes which are introduced into a plurality of horizontal subsurface flow constructed wetland units.

Preferably, the horizontal subsurface flow constructed wetland unit comprises an impermeable layer, a substrate layer and a vegetation layer which are sequentially arranged from bottom to top; the substrate layer comprises a coarse sand layer, a filler layer and a soil layer; the soil layer comprises a nitrification soil layer and a denitrification soil layer; the pH value of the nitrification soil layer is 7.0-8.0, and the pH value of the denitrification soil layer is 6.5-7.5.

The matrix layer comprises coarse sand layer, filler layer and soil layer. The reaction layer is distributed with microorganisms causing nitrification and denitrification reactions, and thus the pH of the layer is set to enable the microorganisms to have good activity, and the pH can be adjusted by using an acetic acid-sodium acetate buffer, or a sodium carbonate-sodium bicarbonate buffer. The presence of the vegetable layer is intended to better utilize the N element and absorb the NH not adsorbed by the zeolite₄ ⁺And partially nitrated reaction products.

Preferably, the filler layer is of a drawer type structure; the filler of the filler layer is zeolite;

the scheme of the invention for further realizing N element resource utilization is that a drawer-type filler layer is adopted, and NH in a nitrification region is used as₄ ⁺When the concentration reaches a set value, the artificial wetland stops air intake and water inflow, and water is distributedThe water level of the area is controlled below the drawer type structure, the drawer type structure is drawn out, and the filler layer is replaced. The replaced zeolite can be used as soil conditioner.

Preferably, the zeolite is subjected to an activation treatment, the activation treatment step comprising:

(1) natural zeolite is put into H with the mass fraction of 5 to 10 percent₂O₂Soaking the solution for 2-3 h, taking out and draining;

(2) roasting the zeolite at the temperature of 300-400 ℃ for 3-6 h;

(3) quickly putting the zeolite obtained in the step (2) into a NaCl solution with the mass fraction of 5% -10% for quenching and soaking for 1-2 h, then carrying out ultrasonic treatment in the soaking solution, washing the zeolite at least once with clear water after the ultrasonic treatment is finished, carrying out ultrasonic treatment in ionized water after the washing, taking out the zeolite and draining;

(4) and (4) carrying out microwave drying on the zeolite obtained in the step (3) to obtain activated zeolite.

In order to activate the zeolite, firstly, the zeolite is put into H with the mass fraction of 5-10%₂O₂Soaking in the solution for 2-3H to fill the zeolite pore channels with H₂O₂Solution, subsequent high temperature calcination thereof, due to H₂O₂The solution is filled in the pore canal and can decompose O at high temperature₂Organic matters in the zeolite can be better removed, gas is generated, and zeolite pore channels can be dredged; secondly, the zeolite surface material is rapidly separated along with the boiling of the surface water film by quenching in NaCl solution, the surface pore channels are dredged, the gas in the zeolite is rapidly discharged, and Na⁺Can replace Ca in zeolite²⁺、Mg²⁺Cations with larger equal radius have small steric hindrance, accelerated internal diffusion and increased exchange capacity, thereby improving the NH pair of the zeolite₄ ⁺The adsorption capacity and the ion exchange capacity of the composite material are improved, and the ultrasonic treatment is carried out after the composite material is fully soaked, so that the flow rate of liquid in a pore channel can be accelerated, and Na can be added⁺The exchange is more sufficient, then the washing and the draining are carried out, and the ultrasonic is soaked in the deionized water to clean the pore channel; drying with microwave, wherein water molecules in zeolite pore channels vibrate violently under the action of microwave to collideThe zeolite pore channels are hit, so that the zeolite structure is looser, and the activity of the zeolite is further improved.

Preferably, the coarse sand layer is communicated with an aeration pipe; the aeration pipe is of a net structure or a disc structure, uniform vertical downward air distributing openings are distributed in the aeration pipe, and filter screens are arranged at the air distributing openings.

In order to aerate more fully, be equipped with evenly distributed's cloth gas port on the aeration pipe, and in order to prevent that cloth gas port from blockking up, the cloth gas port direction that this device adopted is vertical downwards to it has the filter screen to cover at cloth gas port aeration pipe cloth gas port is vertical downwards and the filter screen setting is in order to prevent that particle thing from blockking up the aeration pipe in the coarse sand layer, and the mouth of pipe is equipped with the filter screen simultaneously and can makes the bubble of cloth gas port refine, increases the area of contact of gas and water.

Preferably, the horizontal subsurface flow constructed wetland unit comprises a water distribution area, a nitrification area, a denitrification area and a water collection area; the nitrification area is an aeration area for the compost waste gas to enter the horizontal subsurface flow constructed wetland; the nitrification region and the denitrification region are separated by a partition plate; the water inlet of the water distribution area is higher than the water outlet of the water collection area in the vertical direction.

Water enters the nitrification region through the osmosis in the water distribution region in order to better utilize NO in the nitrification region₃ ^-And NO₂ ^-The nitrification area and the denitrification area are separated by the partition plate, so that microorganisms on two sides are prevented from channeling each other; in order to enable the discharge of the water outlet of the water collecting area to reach the expected target, the water outlet position of the denitrification area is arranged at the bottom. The reaction equation of the nitration zone is:

NH₄ ⁺+1.5O₂→NO₂ ^-+H₂O+2H⁺

NO₂ ^-+0.5O₂→NO₃ ^-

the reaction equation of the denitrification zone is:

2NO₃ ^-+10e^-+12H⁺→N₂+6H₂O

preferably, the nitrification region is provided with a dissolved oxygen concentration detection means and a nitrogen detection means, wherein the nitrogen detection section is provided with a nitrogen detection portionThe component is arranged at the junction of the nitrification soil layer and the denitrification soil layer at the top end of the clapboard; the concentration range of dissolved oxygen in the nitrification region is 2-3 mg/L, NH₄ ⁺Concentration of<35 mg/L; water outlet NH of water collecting area₄ ⁺ <5 mg/L。

In order to ensure that the nitrification region has sufficient oxygen, the concentration range of dissolved oxygen in the nitrification region is set to be 2-3 mg/L, and NH is set₄ ⁺Concentration of<35 mg/L, when NH is detected₄ ⁺When the concentration is more than or equal to 35 mg/L, the zeolite can be replaced; the effluent of the denitrification area is limited according to the first class A of the discharge standard of urban sewage, and the water outlet NH of the water collection area₄ ⁺Concentration of<5 mg/L。

Preferably, the composting reactor comprises an agitator; the stirrer is connected with the intelligent aeration equipment; the intelligent aeration equipment is connected with the intelligent gas supply equipment.

In order to control the amount of gas entering the constructed wetland, NH is added₃The invention adopts intelligent control technology, and controls the intelligent gas supply equipment and the stirrer by monitoring the nitrogen content in the nitrification region, thereby realizing the control of the actual aeration efficiency and the gas component ratio.

Preferably, the temperature in the composting reactor ranges from room temperature to 65 ℃; the oxygen concentration in the composting reactor accounts for 10-15% of the gas mass percentage.

The temperature in the composting reactor is less than 65 ℃, and the temperature exceeding 65 ℃ can cause the inactivation of microorganisms and influence the composting efficiency.

The invention also provides a method for denitrifying the constructed wetland by using the denitrification device, which comprises the following steps:

(1) air is pumped into the composting reactor through intelligent air supply equipment of an air pump, and NH in the composting reactor₃Is carried into an aeration pipe; at this time, the stirrer in the composting reactor stirs the composting materials;

(2) air and NH in the aeration pipe₃A coarse sand layer NH entering the horizontal subsurface flow constructed wetland from the gas distribution port₃And O in air₂Dissolving in water to generate NH₄ ⁺；

（3）NH₄ ⁺Into the packing layer, part of NH₄ ⁺Will be adsorbed by the zeolite filler leaving NH₄ ⁺Entering the soil layer;

(4) NH into the soil layer₄ ⁺Nitration takes place in the layer of nitrified soil to give nitrified material, partial nitrified material and NH which has not been converted into nitrified material₄ ⁺Absorbed by plants, and the rest part enters a denitrification soil layer;

(5) the denitrification layer generates denitrification reaction to remove NO₃ ^-And NO₂ ^-Is reduced to N₂The water after reaction enters a water collecting area and is then detected and discharged at a water outlet;

the nitrogen concentration detection part and the dissolved oxygen concentration detection part of the horizontal subsurface flow constructed wetland monitor the nitrogen concentration and the dissolved oxygen concentration of the nitrification region in real time, and feed information back to the intelligent aeration equipment so as to adjust the intelligent gas supply equipment and the stirrer; an oxygen concentration detection component and a temperature detection component which are arranged in the composting reactor monitor the temperature and the oxygen concentration in the composting reactor in real time, and information is fed back to the intelligent aeration equipment, so that the intelligent gas supply equipment and the stirrer are adjusted;

NH monitored by the nitrogen concentration detection part₄ ⁺When the concentration is more than or equal to 35 mg/L, the filler layer is replaced.

The invention provides an aerobic composting reinforced horizontal undercurrent artificial wetland denitrification method, which comprises the steps of pumping gas into a composting reactor through an intelligent gas supply device, enabling the gas to enter a coarse sand layer of the horizontal undercurrent artificial wetland through an aeration pipe after the gas passes through composting substances, and enabling the gas to float a filler layer which absorbs a part of NH (NH) because water infiltrated into a water distribution area submerges a nitrification soil layer₄ ⁺The remaining part enters the nitrified soil layer of the soil layer to carry out nitration reaction, and reaction products and NH which is not converted into nitride₄ ⁺After the part of the water is absorbed by the plants, the rest part enters a denitrification soil layer along with the water flow, the denitrification generates nitrogen, and the water flow enters a water collecting area. Wherein the nitrogen concentration detection component and the dissolved oxygen concentration detection component of the horizontal subsurface flow constructed wetland are arrangedAnd monitoring the nitrogen concentration and the dissolved oxygen concentration of the nitrification region in real time and the temperature and the oxygen concentration in the compost reactor by an oxygen concentration detection part and a temperature detection part of the compost reactor, and feeding back to the intelligent aeration equipment so as to adjust the intelligent gas supply equipment and the stirrer. NH detected by the nitrogen concentration detection part₄ ⁺When the concentration is more than or equal to 35 mg/L, the adsorption capacity of the zeolite is saturated, and the packing layer needs to be replaced.

Compared with the prior art, the invention has the beneficial effects that:

1. realizing the production of waste NH by aerobic composting₃Resource utilization, enrichment of NH by zeolite₄ ⁺The saturated adsorption can be used as a soil conditioner, so that the practical application of an aerobic composting process is widened;

2. the oxygen content of the nitrification area of the horizontal subsurface flow constructed wetland is intelligently controlled, the nitrification capacity is enhanced, and the conversion efficiency of the horizontal subsurface flow constructed wetland is improved.

Drawings

FIG. 1 is a schematic view of the overall assembly of the present invention;

FIG. 2 is a schematic of the nitration zone of the present invention;

FIG. 3 is a schematic diagram of the denitrification zone of the present invention;

fig. 4 is a schematic view of the gas distribution port of the present invention.

The reference signs are:

1. the system comprises an intelligent gas supply device, a composting reactor, an oxygen concentration detection component, a temperature detection component, a stirrer, a coarse sand layer, an aeration pipe, a water inlet, a water distribution area, a vegetation layer, a water layer, a nitrogen concentration detection component, a filler layer, a nitrifying soil layer, a gas distribution opening, a water outlet, a seepage-proof layer, a denitrification soil layer, a water collection area, a soil layer, a partition plate and an intelligent aeration device, wherein the intelligent gas supply device comprises 2, the composting reactor, 3, the oxygen concentration detection component, 4, the temperature detection component, 5, the stirrer, 6, the coarse sand layer, 7, the aeration pipe, 8, the water inlet, 9, the water distribution area, 10, the vegetation layer, 11, the water layer, 12, the nitrogen concentration detection component, 13, the filler layer, 14, the nitrifying soil layer, 15, the gas distribution opening, 16, the water outlet, 17, the seepage-proof layer, 18, the denitrification soil layer, 19, the water collection area, 20, the soil layer, the partition plate and the intelligent aeration device.

Detailed Description

The present invention will be further described with reference to the following examples. The devices, materials and methods referred to in this application are those well known in the art, unless otherwise indicated.

General examples

As shown in fig. 1After the packing layer 13, the intelligent air supply device 1 pumps air into the composting reactor 2, see fig. 2, the oxygen concentration detection part 3 and the nitrogen concentration detection part 12 feed back the results to the intelligent aeration device 22, the intelligent aeration device 22 regulates and controls the stirring speed of the stirrer 5 and the amount of the air pumped by the intelligent air supply device 1, and the temperature detection part 4 monitors the temperature in the composting reactor 2 and feeds back the temperature to the intelligent aeration device 22. The gas in the composting reactor 2 enters the horizontal subsurface flow constructed wetland through the aeration pipe 7, and the gas distribution port 15 of the aeration pipe 7 is arranged on the coarse sand layer of the horizontal subsurface flow constructed wetland and is opened vertically downwards. The water distribution area 9 is provided with a water inlet 8, water in the water distribution area 9 enters a coarse sand layer through osmosis, then the water level of the nitrification area sequentially rises to a nitrification soil layer 14, a packing layer 13 and a soil layer 20 along with the rise of the water level of the water distribution area, then the water level of the nitrification area flows into a denitrification soil layer 18 and then flows to a water collection area 19 until the water level of the water collection area reaches the position of a water outlet 16, at the moment, the surface of the artificial wetland is covered with a water layer 11, and plants in the vegetation layer 10 grow in the soil layer and the water layer. The gas distribution openings 15 are provided with a screen, see FIG. 4, for oxygen and NH in the outlet gas₃Dissolving in water to form NH₄ ⁺. A dissolved oxygen concentration detection component 3 is arranged here, when the dissolved oxygen concentration is not between 2 and 3 mg/L, the dissolved oxygen concentration is fed back to the intelligent aeration equipment 2, and part of NH is₄ ⁺Adsorbed by the filler layer, and the unadsorbed floating water enters the nitrification soil layer 14 to carry out nitrification reaction and be converted into NO₃ ^-Or NO₂ ^-The nitrifying soil layer 14 is provided with a nitrogen concentration detecting part 12 for detecting NH₄ ⁺When the concentration exceeds 35 mg/L, the replacement of zeolite and partial NH in the nitrified soil layer is prompted₄ ⁺、NO₃ ^-And NO₂ ^-Will be absorbed by the vegetation layer, the remainder of NO₃ ^-Or NO₂ ^-Enters a denitrification soil layer 18 and generates N through denitrification₂And finally NH in the water quality detection at the water outlet 16₄ ⁺Concentration of<5 mg/L. Temperature control in a composting reactor 2<At 65 ℃ and the oxygen concentration accounts for 10-15% of the gas mass percent.

Example 1

In the device, the dissolved oxygen concentration detection part 3 detects that the oxygen concentration of the nitrification layer 14 is less than 2 mg/L, a signal is fed back to the intelligent aeration equipment 22, and the pumping gas amount of the intelligent gas supply equipment 1 is increased.

Example 2

In the device, the dissolved oxygen concentration detection part 3 detects that the oxygen concentration of the nitrification layer 14 is more than 3 mg/L, a signal is fed back to the intelligent aeration equipment 22, and the pumping gas amount of the intelligent gas supply equipment 1 is reduced.

Example 3

In the apparatus, a nitrogen concentration detecting part 12 detects a soil layer 20NH₄ ⁺And (3) closing the water inlet when the concentration exceeds 35 mg/L, reducing the water level of the water distribution area 9 to be below the zeolite filler layer 13, drawing out the drawer type structure of the zeolite filler layer 13, replacing the zeolite filler, putting back the drawer type structure of the zeolite filler layer 13, and opening the water inlet.

Example 4

Compared with the example 1, the difference is that the activated zeolite is adopted in the example, and the specific method for activating the zeolite is as follows:

(1) putting natural zeolite into 5% H₂O₂Soaking the solution for 2 hours, taking out and draining;

(2) roasting the zeolite at 300 ℃ for 3 h;

(3) quickly putting the zeolite obtained in the step (2) into a NaCl solution with the mass fraction of 5%, quenching and soaking for 1 h, then carrying out ultrasonic treatment in a soaking solution, washing at least once with clear water after the ultrasonic treatment is finished, carrying out ultrasonic treatment in ionized water after the washing, taking out and draining;

(4) and (4) carrying out microwave drying on the zeolite obtained in the step (3) to obtain activated zeolite.

The apparatus was operated in the same manner as in example 1.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, changes and equivalent structural changes made to the above embodiment according to the technical spirit of the present invention still belong to the protection scope of the technical solution of the present invention.