CN114149083A - Plant carbon source based novel composite artificial wetland system and application thereof - Google Patents
Plant carbon source based novel composite artificial wetland system and application thereof Download PDFInfo
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- CN114149083A CN114149083A CN202111422599.4A CN202111422599A CN114149083A CN 114149083 A CN114149083 A CN 114149083A CN 202111422599 A CN202111422599 A CN 202111422599A CN 114149083 A CN114149083 A CN 114149083A
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 31
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- 241000196324 Embryophyta Species 0.000 claims abstract description 82
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 50
- 239000000945 filler Substances 0.000 claims abstract description 9
- 238000012856 packing Methods 0.000 claims description 28
- 239000010865 sewage Substances 0.000 claims description 14
- 238000009826 distribution Methods 0.000 claims description 13
- 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
- 239000010457 zeolite Substances 0.000 claims description 12
- 230000008635 plant growth Effects 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 4
- 238000005260 corrosion Methods 0.000 claims description 4
- 239000003344 environmental pollutant Substances 0.000 claims description 4
- 239000011159 matrix material Substances 0.000 claims description 4
- 231100000719 pollutant Toxicity 0.000 claims description 4
- 239000010959 steel Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 235000008216 herbs Nutrition 0.000 claims description 2
- 239000011435 rock Substances 0.000 claims description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 abstract description 6
- 230000012010 growth Effects 0.000 abstract description 6
- 230000028327 secretion Effects 0.000 abstract description 6
- MMDJDBSEMBIJBB-UHFFFAOYSA-N [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] Chemical compound [O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O.[NH6+3] MMDJDBSEMBIJBB-UHFFFAOYSA-N 0.000 abstract description 5
- 235000015097 nutrients Nutrition 0.000 abstract description 5
- 238000010276 construction Methods 0.000 abstract description 3
- 241000894006 Bacteria Species 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 14
- 238000000034 method Methods 0.000 description 8
- 229910052757 nitrogen Inorganic materials 0.000 description 8
- 244000005700 microbiome Species 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 230000000813 microbial effect Effects 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 4
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 4
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000011574 phosphorus Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 3
- 230000014759 maintenance of location Effects 0.000 description 3
- 150000007524 organic acids Chemical class 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000000746 purification Methods 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 241000931336 Chloris truncata Species 0.000 description 2
- JVMRPSJZNHXORP-UHFFFAOYSA-N ON=O.ON=O.ON=O.N Chemical compound ON=O.ON=O.ON=O.N JVMRPSJZNHXORP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012258 culturing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000001272 nitrous oxide Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 230000002572 peristaltic effect Effects 0.000 description 2
- 240000008167 Calamus deerratus Species 0.000 description 1
- 235000011996 Calamus deerratus Nutrition 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 241001633663 Iris pseudacorus Species 0.000 description 1
- 235000005205 Pinus Nutrition 0.000 description 1
- 241000218602 Pinus <genus> Species 0.000 description 1
- CKUAXEQHGKSLHN-UHFFFAOYSA-N [C].[N] Chemical compound [C].[N] CKUAXEQHGKSLHN-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005273 aeration Methods 0.000 description 1
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 235000014113 dietary fatty acids Nutrition 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229930195729 fatty acid Natural products 0.000 description 1
- 239000000194 fatty acid Substances 0.000 description 1
- 235000019387 fatty acid methyl ester Nutrition 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 235000021095 non-nutrients Nutrition 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 230000003248 secreting effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Images
Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
- A01G31/00—Soilless cultivation, e.g. hydroponics
- A01G31/02—Special apparatus therefor
-
- 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
- C02F3/02—Aerobic processes
- C02F3/10—Packings; Fillings; Grids
- C02F3/101—Arranged-type packing, e.g. stacks, arrays
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
-
- 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
- C02F2101/163—Nitrates
-
- 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
- C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
-
- 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
- C02F2209/14—NH3-N
-
- 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
- C02F2209/16—Total nitrogen (tkN-N)
-
- 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
- C02F2209/18—PO4-P
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
-
- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P60/00—Technologies relating to agriculture, livestock or agroalimentary industries
- Y02P60/20—Reduction of greenhouse gas [GHG] emissions in agriculture, e.g. CO2
- Y02P60/21—Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
-
- 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
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- Engineering & Computer Science (AREA)
- Microbiology (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Biodiversity & Conservation Biology (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Environmental Sciences (AREA)
- Biotechnology (AREA)
- Botany (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The invention discloses a novel plant carbon source based composite constructed wetland system and application thereof.A plant culture system is constructed on the upper layer of a filler bed, and an upper water body space is fully utilized to provide a carbon source for heterotrophic denitrifying bacteria by the secretion and self-metabolism of plant root systems so as to improve the denitrification rate and maintain the durability of the denitrification performance of the constructed wetland. The system consists of a traditional constructed wetland packed bed and a plant culture system, a downstream operation mode is adopted, ammonia nitrogen passes through a part of a plant root system area and is absorbed by the plant root system as nutrient for the growth of the plant root system, the other part of the plant root system area is converted into nitrate nitrogen through nitrification, the plant is secreted through the root system to provide a carbon source for denitrification, and the operation cost is effectively reduced. Meanwhile, only half of the filler is used for filling the whole packed bed, the structure is simple, the management is convenient, the cost of wetland construction is reduced, and the application prospect is high.
Description
Technical Field
The invention relates to the field of advanced sewage treatment, in particular to a method for deeply treating nitrogen and phosphorus in low-pollution water by using a novel plant carbon source based composite artificial wetland system and application thereof.
Background
In recent years, with the enhancement of the treatment strength of lakes in China and the proposal of new concepts of lake treatment, the pollution problem caused by low-pollution water is more and more concerned, and the treatment of the low-pollution water becomes a new challenge after the point source and area source pollution control of lake basins. The low-pollution water has large water amount, unstable discharge, low carbon-nitrogen ratio and difficult TN removal, and comprises tail water which is still a pollution source after being treated by a sewage treatment facility, surface runoff, farmland drainage with low pollutant concentration, surface runoff in villages in rainy seasons and the like.
As a typical natural treatment technology for removing pollutants by utilizing the coupling action of plant-matrix-microorganism, the artificial wetland has the advantages of low capital construction and operation cost, convenient management, large treatment capacity, green ecology and the like compared with the traditional activated sludge method, and is widely applied to the deep purification treatment of the three-level sewage. The microbial denitrification in the artificial wetland is generally considered to be the most important way for wetland denitrification, most of the microbes participating in the denitrification are heterotrophic microbes, the denitrification rate is often limited by the availability of organic carbon sources, sufficient carbon sources are required to serve as denitrification energy, low-pollution water is generally low in COD content and is not beneficial to microbial denitrification, so that the denitrification efficiency of the artificial wetland is reduced, and the problem is often overcome by adding exogenous organic carbon sources (such as adding methanol, ethanol, acetic acid, glucose and the like). Therefore, the search for efficient carbon sources for promoting the action of denitrifying microorganisms is an urgent problem to be solved for denitrification of artificial wetlands.
The plant is the advantage of the artificial wetland system different from other sewage treatment technologies, is one of the important supporters of microbial activities, and is an indispensable important component of the artificial wetland. The plants can not only directly absorb and utilize substances such as N, P in sewage, but also provide nutrient substances for root system environment and promote growth of rhizosphere microorganisms. The plant rhizosphere is regarded as the most important part for removing nitrogen from the artificial wetland as a key part for connecting plants and microorganisms in the whole wetland. Plants can provide energy and nutrient sources for rhizosphere microorganisms through the production of secretions, especially in low C/N ratio sewage, plant roots can provide carbon sources for heterotrophic denitrifying bacteria through secretion and self-metabolic decay, and also can provide some non-nutrient substances, such as fatty acid methyl ester and fatty acid amide, to promote denitrification.
Disclosure of Invention
In order to solve the problems of difficult carbon source supplement and high cost of the artificial wetland, the invention discloses a plant carbon source based novel composite artificial wetland system and a treatment method for economically and efficiently removing nitrogen and phosphorus in low-pollution water.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the novel plant carbon source based composite artificial wetland system comprises an artificial wetland packing layer and a plant layer, wherein the packing layer comprises a packed bed and a drainage pipeline, the plant layer comprises a water distribution pipeline, a plant culture system and a plant system, and the packing layer is positioned at the lower part of the artificial wetland system and only occupies less than half of the whole artificial wetland system.
As a preferable technical scheme of the invention, the matrix filler of the filler layer is selected from gravel, zeolite, ceramsite, volcanic rock and the like.
As a preferable technical scheme of the invention, the packing layer is divided into two parts, and a coarse gravel layer and a zeolite layer are respectively paved from bottom to top to be respectively used as a bearing layer and a main reaction layer.
As a preferred technical scheme of the invention, the diameter of the coarse gravel is 1-2 cm, and the diameter of the zeolite is 4-8 mm; comprising a 5cm coarse gravel layer and a zeolite layer with a packing height of 25 cm.
As a preferred technical scheme of the invention, the water distribution pipeline is arranged at the upper part of the plant root system, and the water distribution holes are uniformly distributed and used for uniformly injecting sewage into the artificial wetland.
In a preferable technical scheme of the invention, the plant culture system takes a PVC pipe with the diameter of 8cm, the hollow height of 5cm and the sealed bottom as a container for plant growth and fixation, and the PVC pipe is inserted and fixed by using an anti-corrosion steel wire and suspended on the upper part of the artificial wetland bed body and is 20cm away from the packed bed.
As a preferred technical scheme of the invention, the PVC pipe is fixed inside the system and is 5cm away from the top. The bottom of PVC pipe body is covered with the aperture that the diameter is 6 ~ 8mm, is convenient for water flow and pollutant misce bene. The design preserves the integrity of the plant rootstock, and the root system grows alternately through the small holes, thereby avoiding the trouble of repeated planting.
The preferable technical scheme is characterized in that the plants are perennial herbs, have short and thick rootstocks and hard fibrous roots; the planting mode is a high-density planting mode, and the planting density is 300-400 plants/m2The PVC pipe is used as a plant growth fixer, and the root system is inserted into the small hole at the bottom of the PVC pipe. The developed root system of the pinus alternatus is utilized to form a rich root system microbial community structure by secreting organic acid substances as carbon sources.
As a preferred technical scheme of the invention, the drainage pipeline is laid at the bottom of the artificial wetland system and used for collecting the effluent of the artificial wetland.
As a preferred technical scheme of the invention, in order to ensure the continuity of the water outlet of the artificial wetland, the water outlet is connected with a U-shaped pipeline, the highest point is flush with the highest point of the artificial wetland device, and the siphon pipe realizes the automatic drainage and the automatic lifting of the water level by utilizing the siphon principle.
The main operation process of the plant carbon source based vertical flow constructed wetland adopts the system, and comprises the following steps:
(1) and in the system starting period, anaerobic sludge of a sewage treatment plant is inoculated to the packing layer, so that the starting period of the constructed wetland is greatly shortened.
(2) And introducing Hoagland solution into the plant culture system for culturing for a certain period to maintain the normal growth of the plants.
(3) And (2) filling sewage into the substrate area through a water distribution pipeline of the water inlet area by using a peristaltic pump, setting the hydraulic retention time of the artificial wetland to be 36 hours by adopting a continuous flow operation mode, wherein ammonia nitrogen passes through a part of the plant root area and is absorbed by the plant root system as a nutrient for the growth of the plant root system, and the other part of the ammonia nitrogen is converted into nitrate nitrogen through nitrification, and heterotrophic microorganisms on the substrate layer convert the nitrate nitrogen into nitrite nitrogen, nitric oxide, nitrous oxide, nitrogen and the like by using organic acid substances secreted by the root system as a carbon source.
(4) The water outlet is positioned at one side of the packing layer, the water outlet at the bottom of the packing layer is connected with an inverted U-shaped siphon pipe, the siphon pipe is positioned in the water outlet area, and the siphon pipe is flush with the whole system.
The beneficial effects of the invention compared with the prior art comprise:
the downward vertical flow constructed wetland has a simple structure and is convenient to manage, only half of the filler is used for filling the whole filler bed, the cost for wetland construction is reduced, the plant layer directly places the plant in the water body by taking the PVC pipe as a support, no filler matrix is required to be added, the upper water body space is fully utilized, and the problem of matrix blockage is relieved on the basis of realizing the purification effect of the constructed wetland. Meanwhile, the plant root system is directly reserved in the plant growth system, so that the operation and maintenance cost caused by later plant harvesting is effectively reduced. Utilize the flourishing root system in the windmill grass water planting system, produce different plant roots secretion, release the carbon source to form abundant root system microbial community structure, effectively get rid of COD, ammonia nitrogen and total phosphorus simultaneously, avoided organic carbon source to add and promoted the problem that the process of denitrification and running cost increase, also avoided constructed wetland to block up the problem, maintain the steady operation of system when guaranteeing denitrification efficiency and improving.
Specifically, the packing layer is positioned at the lower part of the artificial wetland system and only occupies half of the whole artificial wetland device, so that half of the packing cost is saved; the plant culture system is arranged on the upper part of the artificial wetland device and is a water culture system, so that the problem of substrate blockage is relieved. A downstream continuous operation mode is adopted, the hydraulic retention time is 36 hours, dissolved oxygen is provided for the nitrification process through the plant root system oxygen secretion in the plant culture system, additional aeration is not needed, the carbon source released by the root system secretion provides a certain carbon source for the denitrification of the packing layer, and the problem of cost increase caused by the addition of the organic carbon source is solved. The average total nitrogen removal rate is 96.03 +/-2.10%, is higher than that of most artificial wetlands, and has important guiding significance for further realizing high-efficiency purification of low-pollution water.
Drawings
Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.
Fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.
Fig. 3 is a schematic diagram comparing TN removal rate of the wetland system of the present invention with that of the conventional wetland system.
FIG. 4 shows effluent NO of the wetland system of the invention and the conventional wetland system3 -Concentration comparison scheme.
FIG. 5 shows effluent NO of the wetland system of the invention and the conventional wetland system2 -Concentration comparison scheme.
FIG. 6 is a PO of the wetland system of the present invention and the conventional wetland system4 3-The removal rate is compared with the diagram.
Wherein, 1 is a water inlet, 2 is a plant culture system, 3 is a separation screen, 4 is a zeolite layer, 5 is a drainage pipeline, 6 is a plant, 7 is a water distribution pipeline, 8 is a water outlet, 9 is an anti-corrosion steel wire, 10 is a small hole, 11 is a PVC pipe, 12 is a U-shaped pipe, and 13 is a coarse gravel layer.
Detailed Description
The technical solution of the present invention is further illustrated by the following specific embodiments in conjunction with the accompanying drawings. It should be noted that the following specific examples are given by way of illustration only and the scope of the present invention is not limited thereto.
Example 1
Referring to fig. 1, the novel plant carbon source based composite artificial wetland system comprises an artificial wetland packing layer and a plant layer, wherein the packing layer comprises a packed bed and a drainage pipeline, the plant layer comprises a water distribution pipeline, a plant culture system and a plant system, the packing layer is positioned at the lower part of the artificial wetland system and only occupies one half of the whole artificial wetland system, and the plant carbon source based composite artificial wetland system comprises:
the packing layer is divided into two parts, and a coarse gravel layer and a zeolite layer are respectively paved from bottom to top to be respectively used as a bearing layer and a main reaction layer. The packing layer is respectively provided with a coarse gravel layer with the packing height of 5cm and a zeolite layer with the packing height of 25cm from bottom to top; the diameter of the coarse gravel is 1-2 cm, and the diameter of the zeolite is 4-8 mm.
The water distribution pipeline is arranged on the upper part of the plant root system, and the water distribution holes are uniformly distributed and used for uniformly injecting sewage into the artificial wetland.
The plant culture system takes a PVC pipe with the diameter of 8cm, the hollow height of 5cm and the sealed bottom as a container for plant growth and fixation, and the PVC pipe is fixedly inserted through the anti-corrosion steel wire and suspended on the upper part of the artificial wetland bed body and is 20cm away from the packed bed. The PVC pipe was fixed inside the system, 5cm from the top. The planting density is about 300-400 plants/m2The windmill grass takes a PVC pipe as a plant growth fixer, and the root system is inserted into a small hole at the bottom of the PVC pipe.
Example 2
As shown in fig. 2, the novel plant carbon source based composite artificial wetland system comprises an artificial wetland packing layer and a plant layer, wherein the packing layer comprises a packed bed and a drainage pipeline, and the plant layer comprises a water distribution pipeline, a plant culture system and a plant system.
The planting density in the plant system is about 300-400 plants/m2The yellow flag is characterized in that a PVC pipe is used as a plant growth fixer, and a root system is inserted into a small hole at the bottom of the PVC pipe. The rest is the same as example 1.
The operation method of the invention is basically the same as that in the embodiment 1, the difference is that the plant in the plant system is calamus flavus with short and thick rootstock, high plant height and dense leaves, which belongs to emergent water perennial root herbaceous plants, sewage is input into the novel composite vertical flow artificial wetland system with the plant carbon source base from the upper part, and effluent is discharged through the U-shaped pipe after reaching the water level height through the water discharge pipe and the U-shaped pipe. The embodiment 2 can achieve the nitrogen and phosphorus removal strengthening function of the low-pollution water described in the embodiment 1, and provides application forms of the plant carbon source based composite artificial wetland in different scenes.
Example 3
An operation method of a novel plant carbon source based composite artificial wetland system comprises the following steps:
adopting the novel plant carbon source based composite artificial wetland system of the embodiment 1;
(1) and in the system starting period, anaerobic sludge of a sewage treatment plant is inoculated to the packing layer, so that the starting period of the constructed wetland is greatly shortened.
(2) And introducing Hoagland solution into the plant culture system for culturing for a certain period to maintain the normal growth of the plants.
(3) And (2) filling sewage into the substrate area through a water distribution pipeline of the water inlet area by using a peristaltic pump, setting the hydraulic retention time of the artificial wetland to be 36 hours by adopting a continuous flow operation mode, wherein ammonia nitrogen passes through a part of the plant root area and is absorbed by the plant root system as a nutrient for the growth of the plant root system, and the other part of the ammonia nitrogen is converted into nitrate nitrogen through nitrification, and heterotrophic microorganisms on the substrate layer convert the nitrate nitrogen into nitrite nitrogen, nitric oxide, nitrous oxide, nitrogen and the like by using organic acid substances secreted by the root system as a carbon source. The comparison with the traditional artificial wetland system is respectively shown in figures 3-6.
(4) The water outlet is positioned at one side of the packing layer, the water outlet at the bottom of the packing layer is connected with an inverted U-shaped siphon pipe, the siphon pipe is positioned in the water outlet area, and the siphon pipe is flush with the whole system.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The novel plant carbon source based composite artificial wetland system is characterized by comprising an artificial wetland packing layer and a plant layer, wherein the packing layer comprises a packed bed and a drainage pipeline, the plant layer comprises a water distribution pipeline, a plant culture system and a plant system, and the packing layer is positioned at the lower part of the artificial wetland system and only occupies less than half of the whole artificial wetland system.
2. The composite constructed wetland system of claim 1, wherein the matrix filler of the filler layer is selected from gravel, zeolite, ceramsite, volcanic rock and the like.
3. The composite constructed wetland system of claim 1 or 2, wherein the packing layer is divided into two parts, and a coarse gravel layer and a zeolite layer are respectively paved from bottom to top to respectively serve as a supporting layer and a main reaction layer.
4. The composite constructed wetland system of claim 3, wherein the diameter of the coarse gravel is 1-2 cm, and the diameter of the zeolite is 4-8 mm; comprising a 5cm coarse gravel layer and a zeolite layer with a packing height of 25 cm.
5. The composite artificial wetland system of claim 1, wherein the water distribution pipeline is arranged at the upper part of the plant root system, and the water distribution holes are uniformly distributed for uniformly injecting sewage into the artificial wetland.
6. The composite constructed wetland system of claim 1, wherein the plant cultivation system uses a PVC pipe with a diameter of 8cm, a hollow height of 5cm and a sealed bottom as a container for plant growth and fixation, and the PVC pipe is inserted and fixed by an anti-corrosion steel wire and suspended on the upper part of the constructed wetland bed body and is 20cm away from the packed bed.
7. The composite artificial wetland system of claim 6, wherein the distance between the PVC pipe and the top is 5cm, and small holes with the diameter of 6-8 mm are distributed at the bottom of the PVC pipe body, so that the water body flow and the pollutants are uniformly mixed.
8. The complex constructed wetland system of claim 1 or 7, whereinThe plants are perennial herbs, have short and thick root stocks and hard fibrous roots; the planting mode is a high-density planting mode, and the planting density is 300-400 plants/m2The PVC pipe is used as a plant growth fixer, and the root system is inserted into the small hole at the bottom of the PVC pipe.
9. The composite artificial wetland system of claim 1, wherein a drainage pipeline is laid at the bottom of the artificial wetland system and used for collecting the effluent of the artificial wetland.
10. The combined artificial wetland system of claim 9, wherein the water outlet is connected with a U-shaped pipeline, the highest point of the U-shaped pipeline is flush with the highest point of the artificial wetland device, and the siphon pipe automatically drains water and automatically raises and lowers the water level by utilizing the siphon principle, so as to ensure the continuity of the water outlet of the artificial wetland.
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