CN116282539B - Vertical flow constructed wetland tank and combined rural domestic sewage treatment device - Google Patents
Vertical flow constructed wetland tank and combined rural domestic sewage treatment device Download PDFInfo
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- CN116282539B CN116282539B CN202310235330.8A CN202310235330A CN116282539B CN 116282539 B CN116282539 B CN 116282539B CN 202310235330 A CN202310235330 A CN 202310235330A CN 116282539 B CN116282539 B CN 116282539B
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- 239000010865 sewage Substances 0.000 title claims abstract description 127
- 241000894006 Bacteria Species 0.000 claims abstract description 36
- 238000005273 aeration Methods 0.000 claims abstract description 34
- 235000014676 Phragmites communis Nutrition 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 50
- 239000002245 particle Substances 0.000 claims description 30
- 239000002699 waste material Substances 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 13
- 235000019738 Limestone Nutrition 0.000 claims description 12
- 229910021536 Zeolite Inorganic materials 0.000 claims description 12
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 claims description 12
- 239000006028 limestone Substances 0.000 claims description 12
- 230000001546 nitrifying effect Effects 0.000 claims description 12
- 239000010457 zeolite Substances 0.000 claims description 12
- 239000010802 sludge Substances 0.000 claims description 8
- 239000007787 solid Substances 0.000 claims description 8
- 238000007789 sealing Methods 0.000 claims description 7
- 239000002689 soil Substances 0.000 claims description 7
- 230000009471 action Effects 0.000 claims description 4
- 238000000855 fermentation Methods 0.000 claims description 4
- 230000004151 fermentation Effects 0.000 claims description 4
- 239000007788 liquid Substances 0.000 claims description 4
- 238000000926 separation method Methods 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 abstract description 16
- 229910052698 phosphorus Inorganic materials 0.000 abstract description 16
- 239000011574 phosphorus Substances 0.000 abstract description 16
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 abstract description 8
- 230000009286 beneficial effect Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 7
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 5
- 229910052757 nitrogen Inorganic materials 0.000 abstract description 4
- 238000001179 sorption measurement Methods 0.000 abstract description 4
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract 1
- 229910052799 carbon Inorganic materials 0.000 abstract 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 16
- 230000008569 process Effects 0.000 description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 7
- 239000001301 oxygen Substances 0.000 description 7
- 229910052760 oxygen Inorganic materials 0.000 description 7
- 239000010902 straw Substances 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 4
- 238000006396 nitration reaction Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000004062 sedimentation Methods 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- 230000000630 rising effect Effects 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- 240000007594 Oryza sativa Species 0.000 description 2
- 235000007164 Oryza sativa Nutrition 0.000 description 2
- 238000010000 carbonizing Methods 0.000 description 2
- 235000013339 cereals Nutrition 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 238000000227 grinding Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 235000009566 rice Nutrition 0.000 description 2
- 238000007873 sieving Methods 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 241000589151 Azotobacter Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 244000208060 Lawsonia inermis Species 0.000 description 1
- 240000006394 Sorghum bicolor Species 0.000 description 1
- 235000011684 Sorghum saccharatum Nutrition 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 244000098338 Triticum aestivum Species 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000005276 aerator Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- AHEWZZJEDQVLOP-UHFFFAOYSA-N monobromobimane Chemical compound BrCC1=C(C)C(=O)N2N1C(C)=C(C)C2=O AHEWZZJEDQVLOP-UHFFFAOYSA-N 0.000 description 1
- 238000006213 oxygenation reaction Methods 0.000 description 1
- 239000002957 persistent organic pollutant Substances 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/308—Biological phosphorus removal
-
- 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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2203/00—Apparatus and plants for the biological treatment of water, waste water or sewage
- C02F2203/006—Apparatus and plants for the biological treatment of water, waste water or sewage details of construction, e.g. specially adapted seals, modules, connections
-
- 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
- C02F2209/005—Processes using a programmable logic controller [PLC]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention discloses a vertical flow constructed wetland pool and a combined rural domestic sewage treatment device, wherein the sewage treatment device comprises a sewage collection system, a discharge pipe assembly, a vertical flow constructed wetland pool, a supporting seat assembly, an anaerobic treatment system, an air inlet and outlet device, an air inlet pipe, an aeration pipe assembly and an aerobic treatment system, the biological carbon in the covering layer of the vertical flow constructed wetland pool has a certain adsorption effect on pollutants in domestic sewage, has a better removal effect on nitrogen and phosphorus, is beneficial to the adhesion of phosphorus removal bacteria, promotes the dephosphorization of the phosphorus removal bacteria, transmits phosphorus elements to reed at the same time, and is beneficial to the growth of reed; and then the domestic sewage passes through the aerobic nitrification layer and the facultative denitrification layer, and the ammonia nitrogen content in the domestic sewage is further reduced through nitrification and denitrification.
Description
Technical Field
The invention belongs to the technical field of sewage treatment, and particularly relates to a vertical flow constructed wetland tank and a combined rural domestic sewage treatment device.
Background
The rural domestic sewage has the characteristics of small water quantity, dispersed discharge, complex water quality and the like, and a large number of miniaturized treatment equipment is arranged for the rural domestic sewage treatment at present, and most of treatment processes adopt modes of anaerobic, aerobic, plant adsorption and the like. The existing anaerobic sewage treatment utilizes anaerobic microorganisms to degrade and decompose organic pollutants in sewage to generate methane, the methane is a mixed combustible gas taking methane as a main component, and the methane has high heat value and good recycling value, but the methane is rarely recycled in the existing anaerobic treatment process, so that resource waste is caused; in the current aerobic treatment process, equipment such as a fan, an air pump and the like is generally adopted to realize oxygenation, so that the equipment has high cost and strong specialization and needs to be electrified for a long time.
Patent document CN216073498U discloses a combined rural sewage treatment device of MBBR filter cloth, the right of protection is "including box, anaerobism pond, anoxic pond, first good oxygen pond, second good oxygen pond, secondary sedimentation tank, filtering ponds, equipment room and clean water pond, the anaerobism pond is installed on the box inner chamber right side, anoxic pond installs in the anaerobism pond left side and communicates with it, first good oxygen pond is installed in the anoxic pond left side and communicates with it, the second good oxygen pond is installed in the anaerobic pond rear side and communicates with it, the secondary sedimentation tank is installed in the second good oxygen pond right side and communicates with it, the secondary sedimentation tank is installed in the right side of second good oxygen pond, the filtering pond sets up in the second good oxygen pond right side, the filtering pond is installed in the right side of secondary sedimentation tank and communicates with it, the pond is installed between anaerobism pond and filtering pond, and clean water pond communicates with the liquid outlet", this equipment carries out the aeration through the air pump, namely, this equipment carries out the marsh gas in the sewage treatment and carries out the extra power of taking place simultaneously and does not need to carry out the aeration process.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a vertical flow constructed wetland tank and a combined rural domestic sewage treatment device, rural domestic sewage is treated by the vertical flow constructed wetland tank to achieve the purposes of dephosphorization and nitrogen removal, and then the unpowered aeration of an aerobic process is realized by utilizing marsh gas generated in an anaerobic process through the arrangement of an air inlet and outlet device, and meanwhile, the device can realize the recovery of marsh gas, has a simple structure and is convenient for popularization and application.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the periphery and the bottom of the vertical flow constructed wetland pool are provided with an anti-seepage layer, a drainage layer, a facultative denitrification layer, an aerobic nitrification layer and a covering layer are sequentially arranged in the anti-seepage layer from bottom to top, reed is planted on the covering layer, the drainage layer comprises gravel with the particle size of 20-28mm, the facultative denitrification layer comprises biochar, activated sludge and denitrifying bacteria, the aerobic nitrification layer comprises limestone, zeolite, chaff and nitrifying bacteria, and the covering layer comprises biochar, azotobacter, dephosphorization bacteria and soil.
Preferably, the thickness of the drainage layer is 500-600mm, the thickness of the facultative denitrification layer is 400-420mm, the thickness of the aerobic nitrification layer is 400-420mm, and the thickness of the covering layer is 200-240mm.
The invention also provides a rural domestic sewage treatment device which comprises a sewage collection system, a discharge pipe assembly, a vertical flow constructed wetland pool, a supporting seat assembly, an anaerobic treatment system, an air inlet and outlet device, an air inlet pipe, an aeration pipe assembly and an aerobic treatment system.
The sewage treatment system comprises a sewage collection system, a vertical flow constructed wetland pool, an anaerobic treatment system, an aerobic treatment system, a communicating pipe, a support seat assembly, an air inlet and exhaust device, an air inlet pipe and an air exhaust device, wherein the discharge pipe assembly is arranged on the upper portion of the sewage collection system, the vertical flow constructed wetland pool is arranged on the bottom of a water outlet of the discharge pipe assembly, the vertical flow constructed wetland pool is communicated with the anaerobic treatment system through a first drain pipe, the anaerobic treatment system is communicated with the aerobic treatment system through a second drain pipe, the air inlet and exhaust device is arranged on the bottom of the air inlet and exhaust device, the air inlet and exhaust device is communicated with the anaerobic treatment system through a communicating pipe, the air inlet and exhaust device is communicated with the lower portion of the right end of the air inlet and exhaust device, the aeration pipe assembly stretches into the bottom of the aerobic treatment system, and the communicating pipe is arranged on the upper portion of the second drain pipe.
Preferably, the sewage collection system comprises a sewage collection tank, a water inlet pipe assembly, a waste discharge assembly and a water outlet assembly, wherein the water inlet pipe assembly is fixedly connected with one side of the sewage collection tank, the waste discharge assembly is fixedly connected with the other side of the sewage collection tank, the height of the water inlet pipe assembly is higher than that of the waste discharge assembly, and a detachable sealing plate is arranged on the waste discharge assembly.
Preferably, the bottom of the sewage collection tank is provided with a first blow-down valve, the sewage collection tank is provided with an observation window, the water inlet pipe assembly is provided with a stop valve, and the rear end of the stop valve is provided with a second blow-down valve.
Preferably, a third blow-down valve is arranged at the bottom of the anaerobic treatment system, a biogas cover is arranged at the top of the anaerobic treatment system, and a biogas conveying pipe and a safety valve are arranged at the top of the biogas cover.
Preferably, the air inlet and exhaust device comprises a shell, a left end cover, a right end cover, a spring and a piston, wherein the shell is of a cuboid hollow structure, the left end cover is provided with a first air hole corresponding to the communicating pipe, the right end cover is provided with a second air hole corresponding to the aeration pipe assembly, the right end cover is provided with a third air hole corresponding to the air inlet pipe, the piston is positioned inside the shell and can move left and right along the shell, one end, close to the right end cover, of the piston is provided with a cylindrical rod, one end, close to the piston, of the right end cover is provided with a cylindrical seat, the cylindrical seat is provided with a round hole, the grain size in the round hole formed in the cylindrical seat is larger than the outer grain size of the cylindrical rod, and the cylindrical seat is positioned inside the spring.
Preferably, a first one-way valve is arranged in the second drain pipe; and a second one-way valve is arranged in the air inlet pipe.
Preferably, the aeration pipe assembly comprises an aeration pipe and a plurality of aeration discs, and a third one-way valve is arranged in the aeration pipe.
Preferably, a fourth blow-down valve is arranged at the bottom of the aerobic treatment system, and a third drain pipe is arranged at the top of the fourth blow-down valve.
The invention also provides a method for treating rural domestic sewage by using the device, which comprises the following steps:
(1) The rural domestic sewage enters the sewage collection tank through the water inlet pipe assembly, solid particles in the rural domestic sewage are deposited at the bottom of the sewage collection tank, the rural domestic sewage after solid-liquid separation enters the discharge pipe assembly through the water outlet assembly, and the rural domestic sewage is sprayed to the vertical flow constructed wetland tank through the water spray port;
(2) Rural domestic sewage flows through the covering layer, the aerobic nitrification layer, the facultative denitrification layer and the drainage layer from top to bottom, and then flows into the anaerobic treatment system through the first drainage pipe;
(3) Along with the rising of the sewage water level of the anaerobic treatment system, sewage flows into the aerobic treatment system through the second drain pipe, meanwhile, biogas is generated in the anaerobic treatment system, along with the continuous rising of the pressure of the anaerobic treatment system and the continuous rising of fermentation, the biogas with higher pressure pushes the piston to move rightwards, the spring is compressed, the air which enters the cavity B of the air inlet and outlet device through the air inlet pipe is compressed, the third one-way valve is opened, and the aerobic treatment system is aerated through the aeration disc;
(4) As the biogas pressure generated by the anaerobic treatment system continuously rises, when the biogas pressure reaches the upper pressure limit set by a pressure sensor connected to a biogas conveying pipe, a pressure sensor signal is detected by an analog acquisition module of the PLC control system, an electromagnetic valve is opened, high-pressure biogas of the anaerobic treatment system is discharged to appointed equipment, when the biogas pressure in the anaerobic treatment system continuously drops, when the biogas pressure reaches the lower pressure limit set by the pressure sensor connected to the biogas conveying pipe, the pressure sensor signal is detected by the analog acquisition module of the PLC control system, the electromagnetic valve is closed, at the moment, the biogas pressure entering the cavity of the air inlet and outlet device A drops, the piston moves leftwards under the action of spring force, the cavity pressure of the air inlet and outlet device B drops, and air enters the cavity of the air inlet and outlet device B through a second one-way valve and returns to an initial state;
(5) As the water level of the aerobic treatment system rises continuously, it can be discharged to a designated position through the third drain pipe.
Compared with the prior art, the invention has the following beneficial effects:
(1) The vertical flow constructed wetland pool provided by the invention has the advantages that the biochar in the covering layer has a certain adsorption effect on pollutants in domestic sewage, has a good effect of removing nitrogen and phosphorus, is beneficial to the adhesion of phosphorus removing bacteria, promotes the dephosphorization of the phosphorus removing bacteria, transmits phosphorus elements to reed, and is beneficial to the growth of reed; and then the domestic sewage passes through the aerobic nitrification layer and the facultative denitrification layer, and the ammonia nitrogen content in the domestic sewage is further reduced through nitrification and denitrification.
(2) According to the rural domestic sewage treatment device provided by the invention, through the arrangement of the sewage collection system, the discharge pipe assembly, the vertical flow constructed wetland tank, the anaerobic treatment system and the aerobic treatment system, rural domestic sewage is precipitated and conveyed to the vertical flow constructed wetland tank, most ammonia nitrogen in the rural domestic sewage is removed by utilizing the vertical flow constructed wetland tank, meanwhile, the sewage is introduced into the vertical flow constructed wetland tank to form an anaerobic environment, and then the subsequent anaerobic treatment system and the subsequent aerobic treatment system are used for increasing the denitrification and dephosphorization effects and improving the effluent quality.
(3) According to the rural domestic sewage treatment device provided by the invention, the waste discharge assembly is arranged in the sewage collection system, the solid precipitation condition is conveniently known through the observation window, the stop valve is closed when the sewage needs to be cleaned, the second stop valve is opened to drain the sewage, and the detachable sealing plate is opened after the drainage is finished, so that solid particles such as broken stone fine sand can be conveniently cleaned, the whole cleaning process is simple and rapid, and the periphery is basically free of pollution.
(4) According to the rural domestic sewage treatment device provided by the invention, the biogas cover is arranged at the top of the anaerobic treatment system, when the biogas in the anaerobic treatment system reaches a certain pressure, the electromagnetic valve is opened, and the high-pressure biogas in the anaerobic treatment system is used for recycling the biogas through the biogas conveying pipe, so that the resources are prevented from being wasted.
(5) According to the rural domestic sewage treatment device provided by the invention, through the arrangement of the air inlet and outlet device, biogas and natural air generated in the anaerobic process are fully utilized to push the piston to reciprocate back and forth, and the continuous aeration of the aerobic treatment system is efficiently realized under the condition that the external equipment is not additionally arranged in the aerobic treatment system.
Drawings
FIG. 1 is a schematic diagram of the structure of a vertical flow constructed wetland tank provided by the invention;
fig. 2 is a schematic structural view of a combined rural domestic sewage treatment device provided by the invention;
FIG. 3 is a schematic view of a sewage collection system provided by the present invention;
FIG. 4 is a schematic view of a second drain pipe according to the present invention;
fig. 5 is a schematic structural diagram of an air intake and exhaust device provided by the invention.
In the figure: 100. a sewage collection system; 110. a sewage collection tank; 111. a first blow-down valve; 120. a water inlet pipe assembly; 121. a stop valve; 122. a second blow-down valve; 130. a waste discharging component; 131. a sealing plate; 140. an observation window; 150. a drain port assembly; 200. a discharge tube assembly; 201. a water jet; 300. a vertical flow constructed wetland tank; 310. an anti-leakage layer; 320. a drainage layer; 330. a facultative denitrification layer; 340. an aerobic nitration layer; 350. a cover layer; 360. reed; 370. a first drain pipe; 400. a support base assembly; 500. an anaerobic treatment system; 510. a third blow-down valve; 520. a biogas delivery pipe; 530. a safety valve; 540. a communicating pipe; 550. a second drain pipe; 551. a first one-way valve; 600. an air intake and exhaust device; 610. a housing; 620. a left end cover; 621. a first air hole; 630. a right end cover; 631. a second air hole; 632. a third air hole; 633. a cylindrical seat; 640. a spring; 650. a piston; 651. a cylindrical rod; 700. an air intake pipe; 701. a second one-way valve; 800. an aerator pipe assembly; 810. an aeration pipe; 811. a third one-way valve; 820. an aeration disc; 900. an aerobic treatment system; 910. a fourth blow-down valve; 920. and a third drain pipe.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It is noted that the terms "upper," "lower," "left," "right," "top," "bottom," "inner," "outer," and the like are merely used for convenience in describing the present invention and to simplify the description, and do not denote or imply that the components or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
It will be understood that terms first, second, etc. are used herein to describe various elements, but these elements should not be limited by these terms, these terms should be interpreted mainly to distinguish one element from another. In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly, unless otherwise specifically defined and limited.
As shown in FIG. 1, in the vertical flow constructed wetland tank provided by the invention, the periphery and the bottom of the vertical flow constructed wetland tank 300 are provided with an anti-seepage layer 310, the anti-seepage layer 310 is internally provided with a drainage layer 320, a facultative denitrification layer 330, an aerobic nitrification layer 340 and a cover layer 350 in sequence from bottom to top, reed 360 is planted on the cover layer 350, the inside of the drainage layer 320 is communicated with a first drainage pipe 370, most ammonia nitrogen in sewage is removed by the vertical flow constructed wetland tank, and meanwhile, the sewage is led into the vertical flow constructed wetland tank to form an anaerobic environment.
Specifically, the drainage layer 320 includes gravel having a particle size of 20 to 28mm, and the drainage layer 320 has a thickness of 500 to 600mm, more preferably 550mm.
The facultative denitrification layer 330 comprises biochar, activated sludge and denitrifying bacteria, the thickness of the facultative denitrification layer 330 is 400-420mm, wherein the mass ratio of the biochar, the activated sludge and the denitrifying bacteria is 20-30:100-120:1, the particle size of the biochar is 8-16mm, and the preparation process of the biochar comprises the following steps: collecting farmland biomass straw, cleaning, drying, crushing, carbonizing, grinding and sieving to obtain biochar, wherein the farmland biomass straw is rice straw, sorghum straw, corn straw or wheat straw; the denitrifying bacteria are selected from those commonly found in life.
The aerobic nitrifying layer 340 comprises limestone, zeolite, chaff and nitrifying bacteria, wherein the mass ratio of the limestone to the zeolite to the chaff to the nitrifying bacteria is 30-40:30-40:25-30:1, the particle size of the limestone is 8-16mm, the particle size of the zeolite is 12-16mm, the nitrifying bacteria are selected from nitrifying bacteria commonly seen in life, and the thickness of the aerobic nitrifying layer 340 is 400-420mm.
The cover layer 350 comprises biochar, phosphorus removing bacteria and soil, wherein the mass ratio of the biochar to the phosphorus removing bacteria to the soil is 30-40:1-2:80-100, the phosphorus removing bacteria are selected from the common phosphorus removing bacteria in life, and the thickness of the cover layer 350 is 200-240mm, preferably 220mm.
The domestic sewage passes through the covering layer, the biochar in the covering layer has a certain adsorption effect on pollutants in the domestic sewage, has a good effect of removing nitrogen and phosphorus, is beneficial to the adhesion of phosphorus removing bacteria, promotes the dephosphorization of the phosphorus removing bacteria, transmits phosphorus elements to reed, and is beneficial to the growth of reed; and then the domestic sewage passes through the aerobic nitrification layer and the facultative denitrification layer, and the ammonia nitrogen content in the domestic sewage is further reduced through nitrification and denitrification.
As shown in fig. 2 to 5, the rural domestic sewage treatment apparatus provided by the present invention comprises a sewage collection system 100, a discharge pipe assembly 200, a vertical flow constructed wetland tank 300, a support seat assembly 400, an anaerobic treatment system 500, an air inlet and outlet device 600, an air inlet pipe 700, an aeration pipe assembly 800 and an aerobic treatment system 900.
The sewage collection system 100 comprises a sewage collection tank 110, a water inlet pipe assembly 120, a waste discharge assembly 130 and a water outlet assembly 150, wherein the water inlet pipe assembly 120 is fixedly connected with one side of the sewage collection tank 110, the waste discharge assembly 130 and the water outlet assembly 150 are fixedly connected with the other side of the sewage collection tank 110, the height of the water inlet pipe assembly 120 is higher than that of the waste discharge assembly 130, a detachable sealing plate 131 is arranged on the waste discharge assembly 130, a first blow-down valve 111 is arranged at the bottom of the sewage collection tank 110, an observation window 140 is arranged on the sewage collection tank 110, a stop valve 121 is arranged on the water inlet pipe assembly 120, and a second blow-down valve 122 is arranged at the rear end of the stop valve 121; when the domestic sewage containing the solid particles such as crushed stone fine sand flows into the sewage collection tank 110 from the water inlet pipe assembly 120, a flow guiding structure is generally arranged in the sewage collection tank 110 to enable the flow speed of the domestic sewage to be reduced, so that the domestic sewage is settled at the bottom of the sewage collection tank 110, when the solid particles such as crushed stone fine sand at the bottom of the sewage collection tank 110 are observed through the observation window 140 to reach the height required to be cleaned, the stop valve 121 is closed, the second blow-off valve 122 is opened, the existing sewage of the sewage collection tank 110 is drained through a pipeline (not shown in the figure), when the second blow-off valve 122 cannot drain the domestic sewage in the sewage collection tank 110, the detachable sealing plate 131 is opened, the solid particles such as crushed stone fine sand are taken out from the sewage discharge assembly 130 through tools, the first blow-off valve 111 is opened, after the cleaning is completed, the first blow-off valve 111 and the second blow-off valve 122 are closed, and the stop valve 121 is opened after the sealing plate 131 is locked, so that the inlet water of the domestic sewage is recovered.
The discharge pipe assembly 200 is fixedly connected with the water outlet assembly 150 through bolts, an elbow is arranged at the other end of the discharge pipe assembly 200, domestic sewage can be conveyed to the central top of the vertical flow constructed wetland tank 300 in a short distance through the discharge pipe assembly 200, and the domestic sewage is sprayed to the vertical flow constructed wetland tank 300 through the water spraying port 201.
The bottom of the anaerobic treatment system 500 is provided with a third blow-down valve 510, the top of the anaerobic treatment system 500 is provided with a biogas cover, the top of the biogas cover is provided with a biogas conveying pipe 520 and a safety valve 530, the third blow-down valve 510 is normally closed, the anaerobic treatment system 500 is communicated with the aerobic treatment system 900 through a second drain pipe 550, the biogas cover conveying pipe 520 is provided with an electromagnetic valve (not shown in the figure), a pressure sensor (not shown in the figure) and a PLC control system (not shown in the figure), the PLC control system continuously detects the pressure of the biogas conveying pipe 520 through an analog quantity acquisition module and the pressure sensor, the control system sets a pressure upper limit value and a pressure lower limit value of the anaerobic treatment system 500, and controls the opening and closing of the electromagnetic valve, the purpose of stabilizing the pressure of the anaerobic treatment system between the upper limit and the lower limit of the pressure is achieved, when the biogas pressure generated by the anaerobic treatment system 500 is continuously increased and reaches the upper limit of the set pressure, the electromagnetic valve is opened, high-pressure biogas is discharged to the designated equipment, when the biogas pressure in the anaerobic treatment system 500 is continuously reduced and reaches the lower limit of the set pressure, the electromagnetic valve is closed, the whole process is circularly reciprocated, when the electromagnetic valve or the pressure sensor is abnormal, the safety valve 530 plays a role in protecting the anaerobic treatment system 500, the anaerobic treatment system 500 is also penetrated and provided with the communicating pipe 540, the height of the communicating pipe 540 is higher than that of the second drain pipe 550, and the second drain pipe 550 is provided with the first one-way valve 551, so that water can only flow from the anaerobic treatment system 500 to the aerobic treatment system 900.
The air intake and exhaust device 600 is arranged between the anaerobic treatment system 500 and the aerobic treatment system 900, the bottom of the air intake and exhaust device 600 is provided with a supporting seat assembly 400 which supports the air intake and exhaust device 600, the air intake and exhaust device 600 comprises a shell 610, a left end cover 620, a right end cover 630, a spring 640 and a piston 650, the shell 610 is of a rectangular hollow structure, the left end cover 620 is provided with a first air hole 621 corresponding to the communicating pipe 540, the right end cover 630 is provided with a second air hole 631 corresponding to the aeration pipe assembly 800, the right end cover 630 is provided with a third air hole 632 corresponding to the air intake pipe 700, the piston 650 is positioned in the shell 610 and can move left and right along the shell 610, one end of the piston 650, which is close to the right end of the piston 630, is provided with a cylindrical seat 633, the cylindrical seat 633 is provided with a round hole, the inner diameter of the round hole formed by the cylindrical seat 633 is larger than the outer diameter of the cylindrical rod 651, the cylindrical seat 633 is positioned in the spring 640, and the piston 650 divides the air intake and exhaust device 600 into an A cavity and a B cavity.
The second check valve 701 is arranged in the air inlet pipe 700, so that air can only flow into the cavity B of the air inlet and outlet device 600 from the outside of the device.
The aeration pipe assembly 800 comprises an aeration pipe 810 and a plurality of aeration discs 820, the other end of the aeration pipe assembly 800 extends into the bottom of the aerobic treatment system 900, and a third one-way valve 811 is arranged in the aeration pipe 810, so that air in the cavity B of the exhaust device 600 can only flow to the aerobic treatment system 900.
The bottom of the aerobic treatment system 900 is provided with a fourth drain valve 910, the fourth drain valve 910 is normally closed, and the top of the fourth drain valve 910 is provided with a third drain pipe 920.
When sewage just enters the anaerobic treatment system 500, fermentation just begins, the biogas in the anaerobic treatment system 500 is basically pressureless, the electromagnetic valve connected with the rear end of the biogas conveying pipe 520 is in a closed state, air enters the cavity B of the air inlet and outlet device 600 through the second one-way valve 702, the spring 640 is in a free state, after biogas is generated for a certain time, the biogas with higher pressure enters the cavity A of the air inlet and outlet device 600 through the communicating pipe 540, the piston 650 is pushed to move rightwards, the spring 640 is compressed, the air in the cavity B of the original air inlet and outlet device 600 is compressed, the third one-way valve 811 is opened, aeration of the aerobic system is completed through the aeration disc 820, when the pressure of the biogas further rises to reach the upper limit set by the pressure sensor, the electromagnetic valve is opened, the high-pressure biogas is discharged to the designated equipment, at this moment, the pressure of the cavity A of the air inlet and outlet device 600 falls, the piston 650 moves leftwards under the action of the elastic force of the spring 640, the air enters the cavity A of the air inlet and outlet device 600 through the second one-way valve 701, when the pressure in the anaerobic treatment system continuously falls, the biogas reaches the lower limit set pressure, the electromagnetic valve is closed, and the process is repeated.
The embodiment of the invention also provides a method for treating rural domestic sewage, which comprises the following steps:
(1) Rural domestic sewage enters the sewage collection tank 110 through the water inlet pipe assembly 120, solid particles in the rural domestic sewage are deposited at the bottom of the sewage collection tank 110, the rural domestic sewage after solid-liquid separation enters the discharge pipe assembly 200 through the water outlet assembly 150, and is sprayed to the vertical flow constructed wetland tank 300 through the water spray port 201;
(2) Rural domestic sewage flows through the cover layer 350, the aerobic nitrification layer 340, the facultative denitrification layer 330 and the drainage layer 320 from top to bottom, and then flows into the anaerobic treatment system 500 through the first drainage pipe 370;
(3) As the sewage level of the anaerobic treatment system 500 rises, sewage flows into the aerobic treatment system 900 through the second drain pipe 550, biogas is generated in the anaerobic treatment system 500, as fermentation proceeds, the pressure of the anaerobic treatment system 500 continuously rises, the biogas with higher pressure pushes the piston 650 to move rightward, the spring 640 is compressed, air which originally enters the cavity of the air inlet and outlet device 600B through the air inlet pipe 700 is compressed, the third check valve 811 is opened, and the aerobic treatment system 900 is aerated through the aeration disc 820;
(4) As the biogas pressure generated by the anaerobic treatment system 500 continuously rises, when the biogas pressure reaches the upper pressure limit set by the pressure sensor connected to the biogas conveying pipe 520, the pressure sensor signal is detected by the analog quantity acquisition module of the PLC control system, the electromagnetic valve is opened, the high-pressure biogas of the anaerobic treatment system 500 is discharged to the designated equipment, when the biogas pressure in the anaerobic treatment system 500 continuously drops, when the biogas pressure reaches the lower pressure limit set by the pressure sensor connected to the biogas conveying pipe 520, the pressure sensor signal is detected by the analog quantity acquisition module of the PLC control system, the electromagnetic valve is closed, at the moment, the biogas pressure entering the cavity of the air inlet and outlet device 600A drops, the piston 650 moves leftwards under the action of the elastic force of the spring 640, the air enters the cavity of the air inlet and outlet device 600B through the second one-way valve 701, and the air is restored to the initial state;
(5) As the water level of the aerobic treatment system 900 is continuously increased, it can be discharged to a designated position through the third drain pipe 920.
The vertical flow constructed wetland tank in the invention is further described below by means of specific examples.
Biochar: the biochar in this embodiment is prepared from rice straw by cleaning, drying, pulverizing, carbonizing, grinding, and sieving to obtain black biochar with density of 0.6-0.8g/m 3 ；
The particle size of the limestone is 8-16mm, and the particle size of the zeolite is 12-16mm;
the dephosphorizing bacteria, nitrifying bacteria and denitrifying bacteria are all purchased from Shandong jin Li Cheng environmental technology Co., ltd, and the number of effective viable bacteria is 2.0X10 11 CFU/g；
Activated sludge was purchased from henna, environmental sciences, inc;
the vertical flow constructed wetland test pool provided in this example has a size of 2.5X2.5X1.8 m.
Example 1
A vertical flow constructed wetland pool sequentially comprises the following components from bottom to top:
drainage layer: gravel with the particle size of 20-28mm is paved with the thickness of 500mm;
facultative denitrification layer: the mass ratio of the biochar to the activated sludge to the denitrifying bacteria is 20:100:1, the particle size of the biochar is 8-16mm, and the paving thickness is 420mm;
aerobic nitration layer: the mass ratio of limestone to zeolite to chaff to nitrifying bacteria is 30:30:25:1, the particle size of the limestone is 8-16mm, the particle size of the zeolite is 12-16mm, the particle size of the chaff is 3-5mm, and the paving thickness is 400mm;
and (2) covering layer: the mass ratio of the biochar to the dephosphorizing bacteria to the soil is 30:1:100, and the paving thickness is 200mm.
Example 2
A vertical flow constructed wetland pool sequentially comprises the following components from bottom to top:
drainage layer: gravel with the particle size of 20-28mm is paved with the thickness of 540mm;
facultative denitrification layer: the mass ratio of the biochar to the activated sludge to the denitrifying bacteria is 30:120:1, the particle size of the biochar is 8-16mm, and the paving thickness is 400mm;
aerobic nitration layer: the mass ratio of limestone to zeolite to chaff to nitrifying bacteria is 40:40:30:1, the particle size of the limestone is 8-16mm, the particle size of the zeolite is 12-16mm, the particle size of the chaff is 3-5mm, and the paving thickness is 420mm;
and (2) covering layer: the mass ratio of the biochar to the dephosphorizing bacteria to the soil is 30:1:100, and the paving thickness is 240mm.
Example 3
A vertical flow constructed wetland pool sequentially comprises the following components from bottom to top:
drainage layer: gravel with the particle size of 20-28mm is paved with the thickness of 600mm;
facultative denitrification layer: the mass ratio of the biochar to the activated sludge to the denitrifying bacteria is 20:120:1, the particle size of the biochar is 8-16mm, and the paving thickness is 420mm;
aerobic nitration layer: the mass ratio of limestone to zeolite to chaff to nitrifying bacteria is 30:30:30:1, the particle size of the limestone is 8-16mm, the particle size of the zeolite is 12-16mm, the particle size of the chaff is 3-5mm, and the paving thickness is 220mm;
and (2) covering layer: the mass ratio of the biochar to the dephosphorizing bacteria to the soil is 30:1:100, and the paving thickness is 240mm.
The vertical flow constructed wetland tank in the embodiment 2 of the invention is used for treating domestic sewage, and the water inflow is 3m 3 After the vertical flow constructed wetland pool stably runs for a week, the water quality of the inlet water and the water quality of the outlet water are detected and tested for 3 times in parallel, and the result is averagedValues, results are shown in the following table:
although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The rural domestic sewage treatment device is characterized by comprising a sewage collection system (100), a discharge pipe assembly (200), a vertical flow constructed wetland tank (300), a supporting seat assembly (400), an anaerobic treatment system (500), an air inlet and outlet device (600), an air inlet pipe (700), an aeration pipe assembly (800) and an aerobic treatment system (900);
the periphery and the bottom of the vertical flow constructed wetland pool (300) are provided with an anti-seepage layer (310), a drainage layer (320), a facultative denitrification layer (330), an aerobic nitrification layer (340) and a covering layer (350) are sequentially arranged in the anti-seepage layer (310) from bottom to top, reed (360) is planted on the covering layer (350), the drainage layer (320) comprises gravel with the particle size of 20-28mm, the facultative denitrification layer (330) comprises biochar, activated sludge and denitrifying bacteria, the aerobic nitrification layer (340) comprises limestone, zeolite, chaff and nitrifying bacteria, and the covering layer (350) comprises biochar, dephosphorizing bacteria and soil;
the thickness of the drainage layer (320) is 500-600mm, the thickness of the facultative denitrification layer (330) is 400-420mm, the thickness of the aerobic nitrification layer (340) is 400-420mm, and the thickness of the covering layer (350) is 200-240mm;
the sewage treatment system comprises a sewage collection system (100), a vertical flow constructed wetland tank (300), an air inlet and exhaust device (600), an air inlet pipe (700) and an aeration pipe assembly (900), wherein the sewage collection system (100) is provided with a vertical flow constructed wetland tank (300), the vertical flow constructed wetland tank (300) is arranged at the upper part of the sewage collection system, the vertical flow constructed wetland tank (300) is arranged at the bottom of the water spraying port (201) of the sewage collection system (100), the vertical flow constructed wetland tank (300) is communicated with the anaerobic treatment system (500) through a first water outlet pipe (370), the anaerobic treatment system (500) is communicated with the aerobic treatment system (900) through a second water outlet pipe (550), the air inlet and exhaust device (500) is arranged between the anaerobic treatment system (500) and the aerobic treatment system (900), the bottom of the air inlet and exhaust device (600) is provided with the supporting seat assembly (400), the air inlet and exhaust device (600) is communicated with the anaerobic treatment system (500) through a communicating pipe (540), the upper part of the right end of the air inlet and the air exhaust device (600) is communicated with the aeration pipe assembly (900), and the pipe assembly (800) stretches into the bottom of the aerobic treatment system (900), and is arranged at the upper part of the communicating pipe (550);
the air inlet and exhaust device (600) comprises a shell (610), a left end cover (620), a right end cover (630), a spring (640) and a piston (650), wherein the shell (610) is of a cuboid hollow structure, the left end cover (620) is provided with a first air hole (621) corresponding to the communicating pipe (540), the right end cover (630) is provided with a second air hole (631) corresponding to the aeration pipe assembly (800), the right end cover (630) is provided with a third air hole (632) corresponding to the air inlet pipe (700), the piston (650) is located inside the shell (610) and can move left and right along the shell (610), one end of the piston (650) close to the right end cover (630) is provided with a cylindrical rod (651), one end of the right end cover (630) close to the piston (650) is provided with a cylindrical seat (633), the cylindrical seat (633) is provided with a round hole, the diameter of the cylindrical seat (633) is larger than the outer diameter of the cylindrical rod (651), and the diameter of the cylindrical seat (640) is located inside the spring (633).
2. The rural domestic sewage treatment device according to claim 1, wherein the sewage collection system (100) comprises a sewage collection tank (110), a water inlet pipe assembly (120), a waste discharge assembly (130) and a water outlet assembly (150), the water inlet pipe assembly (120) is fixedly connected with one side of the sewage collection tank (110), the waste discharge assembly (130) and the water outlet assembly (150) are fixedly connected with the other side of the sewage collection tank (110), the height of the water inlet pipe assembly (120) is higher than that of the waste discharge assembly (130), and a detachable sealing plate (131) is arranged on the waste discharge assembly (130).
3. The rural domestic sewage treatment device according to claim 2, wherein a first sewage discharge valve (111) is arranged at the bottom of the sewage collection tank (110), an observation window (140) is arranged on the sewage collection tank (110), a stop valve (121) is arranged on the water inlet pipe assembly (120), and a second sewage discharge valve (122) is arranged at the rear end of the stop valve (121).
4. The rural domestic sewage treatment device according to claim 1, wherein a third sewage discharge valve (510) is arranged at the bottom of the anaerobic treatment system (500), a biogas cover is arranged at the top of the anaerobic treatment system (500), a biogas conveying pipe (520) and a safety valve (530) are arranged at the top of the biogas cover, and a first one-way valve (551) is arranged in the second drain pipe (550); a second one-way valve (701) is arranged in the air inlet pipe (700).
5. A rural domestic sewage treatment apparatus according to claim 1, wherein the aeration pipe assembly (800) comprises an aeration pipe (810) and a plurality of aeration discs (820), wherein a third one-way valve (811) is arranged in the aeration pipe (810); the bottom of the aerobic treatment system (900) is provided with a fourth blow-down valve (910), and the top of the fourth blow-down valve (910) is provided with a third drain pipe (920).
6. A method for treating rural domestic sewage by using the apparatus of any one of claims 1 to 5, comprising the steps of:
s1: rural domestic sewage enters the sewage collection tank (110) through the water inlet pipe assembly (120), solid particles in the rural domestic sewage are precipitated at the bottom of the sewage collection tank (110), the rural domestic sewage after solid-liquid separation enters the discharge pipe assembly (200) through the water outlet assembly (150), and the rural domestic sewage is sprayed to the vertical flow constructed wetland pool (300) through the water spraying port (201);
s2: rural domestic sewage flows through the cover layer (350), the aerobic nitrification layer (340), the facultative denitrification layer (330) and the drainage layer (320) from top to bottom, and then flows into the anaerobic treatment system (500) through the first drainage pipe (370);
s3: as the sewage level of the anaerobic treatment system (500) rises, sewage flows into the aerobic treatment system (900) through the second drain pipe (550), biogas is generated in the anaerobic treatment system (500) at the same time, as fermentation is carried out, the pressure of the anaerobic treatment system (500) continuously rises, the biogas with higher pressure pushes the piston (650) to move rightwards, the spring (640) is compressed, air which originally enters the cavity B of the air inlet and outlet device (600) through the air inlet pipe (700) is compressed, the third one-way valve (811) is opened, and the aerobic treatment system (900) is aerated through the aeration disc (820);
s4: as the biogas pressure generated by the anaerobic treatment system (500) continuously rises, when the biogas pressure reaches the upper pressure limit set by a pressure sensor connected to a biogas conveying pipe (520), a pressure sensor signal is detected by an analog quantity acquisition module of a PLC control system, an electromagnetic valve is opened, high-pressure biogas of the anaerobic treatment system (500) is discharged to appointed equipment, when the biogas pressure in the anaerobic treatment system (500) continuously drops, when the biogas pressure reaches the lower pressure limit set by the pressure sensor connected to the biogas conveying pipe (520), the pressure sensor signal is detected by the analog quantity acquisition module of the PLC control system, the electromagnetic valve is closed, the biogas pressure entering an A cavity of the air inlet and outlet device (600) at the moment drops, a piston (650) moves leftwards under the action of a spring (640), the pressure of a B cavity of the air inlet and outlet device (600) drops, and air enters the B cavity of the air inlet and outlet device (600) through a second one-way valve (701) to restore to an initial state;
s5: as the water level of the aerobic treatment system (900) is continuously increased, it can be discharged to a designated position through the third drain pipe (920).
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| CN115304162A (en) * | 2022-08-17 | 2022-11-08 | 武汉东碧环保科技有限公司 | Rural domestic sewage treatment device and sewage treatment method |
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| CN107892442B (en) * | 2017-12-13 | 2019-01-29 | 中国科学院地理科学与资源研究所 | A kind of basin water resources utilize pollutant preventing control method and device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100952371B1 (en) * | 2009-09-29 | 2010-04-12 | 박현린 | A waste water disposal system |
| WO2019114746A1 (en) * | 2017-12-13 | 2019-06-20 | 中国环境科学研究院 | Control method and device for drainage basin water irrigation of farmland pollutants in extremely water-deficient region |
| CN210457845U (en) * | 2019-07-16 | 2020-05-05 | 沈阳环境科学研究院 | Subsurface flow constructed wetland for enhancing nitrogen and phosphorus removal |
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