CN112624345B - Artificial wetland sewage treatment method - Google Patents
Artificial wetland sewage treatment method Download PDFInfo
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- CN112624345B CN112624345B CN202011393794.4A CN202011393794A CN112624345B CN 112624345 B CN112624345 B CN 112624345B CN 202011393794 A CN202011393794 A CN 202011393794A CN 112624345 B CN112624345 B CN 112624345B
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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
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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
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
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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
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
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- 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 constructed wetland sewage treatment method, which comprises the following steps: (S1) introducing the sewage to be treated into the artificial wetland through a water inlet system arranged above the descending pool, sequentially passing through a plant layer, a gravel sand layer, a gravel layer, a cobble layer, a pyrite slag layer and a gravel layer which are arranged in the descending pool, and then sending the sewage to be treated into the ascending pool through a water collecting and distributing pipe which is arranged in the gravel layer of the descending pool and is used for communicating the descending pool and the ascending pool; (S2) the sewage sent out from the descending pool sequentially passes through a gravel layer, a pyrite cinder layer, a cobble layer, a gravel layer and a gravel sand layer which are arranged in the ascending pool, and then is sent into a clean water pool through an effluent water collecting pipe and a plurality of liquid level discharge pipes which are communicated with the effluent water collecting pipe and have different liquid level discharge heights; (S3) when operating in a low temperature environment, the discharge of the treated water is performed by selecting different liquid level discharge pipes. The invention improves the treatment efficiency of the artificial wetland and can be suitable for operation in various environments.
Description
Technical Field
The invention relates to a sewage treatment method, in particular to a constructed wetland sewage treatment method.
Background
The artificial wet land for treating city sewage is one stuffing bed comprising soil and stuffing, and is characterized by that on the depression with certain length-width ratio and bottom slope, the soil and stuffing are mixed to form the stuffing bed, so that the sewage can flow in the stuffing gaps of the bed body or on the surface of the bed body, and on the surface of the bed body aquatic plants (such as reed and cattail, etc.) with good performance, high survival rate, strong water-resisting property, long growth period, beautiful appearance and economic value are planted to form a unique animal and plant ecological system. The artificial wetland completes the purification process of the sewage by means of the synergistic action of physics, chemistry and biology, and the decontamination capability of the natural wetland ecosystem is enhanced. From the natural regulation, the constructed wetland has a powerful ecological restoration function, plays an important role in providing water resources, regulating climate, degrading pollutants and the like, can absorb gases such as sulfur dioxide, nitrogen oxide, carbon dioxide and the like, increase oxygen, purify air, eliminate urban heat island effect, light pollution, noise absorption and the like.
However, the most obvious disadvantage of the artificial wetland process is that the artificial wetland process is greatly influenced by weather temperature conditions, and the pollutant removal effect of the artificial wetland is changed along with the change of seasons. The plants and microorganisms in the artificial wetland are particularly sensitive to the temperature, and if the growth of the plants and microorganisms in the wetland is influenced, the treatment effect of the artificial wetland is directly influenced. A great deal of research shows that when the water temperature is lower than 10 ℃, the treatment efficiency of the artificial wetland is obviously reduced, and research suggests that the nitrification in the wetland tends to stop when the temperature is lower than 4 ℃. Meanwhile, under the conditions of lower temperature and oxygen content, the activity of the microorganisms is also reduced, so that the decomposition capacity of the microorganisms on organic matters is reduced. Research reports show that the removal rate of each artificial wetland along with the change of seasons is ranked from summer to autumn to spring to winter, the index change of ammonia nitrogen and permanganate is large, and the reduction of the removal rate in winter is particularly obvious. Under the low temperature condition in winter, the removal effect of the artificial wetland is influenced, and the problems of low denitrification efficiency, substrate blockage, bed body oxygen deficiency and the like of the artificial wetland treatment process also exist. In addition, low temperatures can cause certain other problems, including freezing of wetland media/substrates, anoxic wetland beds, and burst pipes. The artificial wetland is greatly influenced by the climate temperature condition, which is one of the reasons for limiting the popularization and application of the artificial wetland in cold regions. Because the technological performance and the stability of the artificial wetland have certain limitations, corresponding strengthening technology or management measures must be adopted to deal with or weaken the influence of the air temperature on the system in the engineering application process; in addition, if the artificial wetland and other process technologies can be matched and combined in the engineering planning stage, the method is a better way of making good use of the advantages and avoiding the disadvantages and fully playing the advantages of the artificial wetland.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the problems of environmental change and insufficient flexibility of wetland operation in the prior art, the invention provides the artificial wetland sewage treatment method which can be suitable for sewage treatment in different environments and give full play to the advantages of the artificial wetland.
The technical scheme is as follows: the invention relates to a constructed wetland sewage treatment method, which comprises the following steps:
(S1) a descending pool, an ascending pool, a silt discharging pool and a clean water pool which are connected in sequence are built, sewage to be treated is introduced into the artificial wetland through a water inlet system arranged above the descending pool, the sewage to be treated sequentially passes through a plant layer, a gravel sand layer, a gravel layer, a cobble layer, a pyrite slag layer and a gravel layer which are arranged in the descending pool, and then the sewage to be treated is sent into the ascending pool through a water collecting and distributing pipe which is arranged in the gravel layer of the descending pool and is used for communicating the descending pool and the ascending pool;
(S2) the sewage sent out from the descending pool passes through a gravel layer, a pyrite slag layer, a cobble layer, a gravel layer and a gravel sand layer which are arranged in the ascending pool in sequence, and then is sent into a clean water pool through a water outlet collecting pipe and a plurality of liquid level discharge pipes which are communicated with the water outlet collecting pipe and have different liquid level discharge heights;
(S3) when operating in a low temperature environment, the discharge of the treated water is performed by selecting discharge pipes of different liquid levels.
In the step (S3), the liquid level discharge pipes include a high water level discharge pipe, a medium water level discharge pipe and a low water level discharge pipe; when the surface of the artificial wetland is not frozen, selecting a high-water-level water outlet pipe to discharge water; and when the surface of the artificial wetland is frozen, a low-water-level water outlet pipe is selected to discharge water.
In the step (S1), the water inlet system includes a wetland water inlet pipe and a plurality of water inlet distribution pipes connected in parallel with the wetland water inlet pipe, and each water inlet distribution pipe is provided with a plurality of nozzles.
When the artificial wetland needs to be desilted, the dredging pipeline system communicated with the clean water tank is used for dredging, the treated water in the clean water tank is sent to the bottom ends of the downlink tank and the uplink tank, the sent treated water washes the artificial wetland from bottom to top, and then the washed sewage is sent to the desilting tank.
Arrange the silt pipe-line system including set up the immersible pump in the clear water pond, with the water pump outlet pipe of immersible pump export intercommunication, with lead silt inlet tube intercommunication set up in down the pond with go upward a plurality of silt water distributors that lead that the parallelly connected setting of pond bottom.
And the outlets of the silt guiding and distributing pipes are provided with vent pipes and vent valves arranged on the vent pipes.
When the concentration of ammonia nitrogen in the artificial wetland is too high, the artificial wetland is emptied, the water inlet system is closed, the emptying valve is opened, and sewage in the artificial wetland flows into the emptying pipe from the silt guiding water distribution pipe and is sent into the silt discharging pool through the emptying pipe.
The silt discharging pipeline system comprises silt guiding and collecting pipes distributed above the descending tank and the ascending tank, outlets of the silt guiding and collecting pipes are communicated with silt guiding water outlet pipes arranged in the silt discharging tank, and silt guiding water outlet valves are arranged on the silt guiding water outlet pipes.
In the artificial wetland sewage treatment method, in the step (S1), the sludge discharge tank comprises a discharge pipeline system arranged at the bottom end of the sludge discharge tank, the discharge pipeline system comprises a discharge pipe arranged at the bottom end of the sludge discharge tank, and the discharge pipe is respectively communicated with a sludge discharge pipeline and an emptying pipeline.
The silt discharging pipeline is provided with a silt discharging pipe valve, and the emptying pipeline is provided with an emptying pipeline valve.
As a preferable method of the invention, the artificial wetland sewage treatment method comprises the following steps:
step (1): the method comprises the following steps of building a descending pool, an ascending pool, a silt discharging pool and a clean water pool which are connected in sequence, introducing sewage to be treated into the constructed wetland through a water inlet system arranged above the descending pool, enabling the sewage to be treated to fall into the descending pool through a plurality of spray heads arranged in the water inlet system by adopting spraying, enabling the sewage to be treated to sequentially pass through a plant layer, a gravel sand layer, a gravel layer, a cobble layer, a pyrite slag layer, a gravel layer and a sand cushion layer arranged in the descending pool, and then sending the sewage to the ascending pool through a water collecting and distributing pipe arranged in the gravel layer of the descending pool and used for communicating the descending pool and the ascending pool;
step (2): sewage sent out from the descending pool sequentially passes through a gravel layer, a pyrite slag layer, a cobble layer, a gravel layer and a gravel sand layer which are arranged in the ascending pool, and then is sent into a clean water pool through a water outlet collecting pipe and a plurality of liquid level discharge pipes which are communicated with the water outlet collecting pipe and have different liquid level discharge heights; when the water-saving device operates in a low-temperature environment, a high-water-level water outlet pipe is selected to discharge water; when the surface of the artificial wetland is frozen, a low-water-level water outlet pipe is selected to discharge water;
and (3): when the artificial wetland needs to be desilted, closing the water inlet system, carrying out desilting treatment on the artificial wetland through a desilting pipeline system communicated with the clean water tank, leading the treated water of the clean water tank into the desilting water distribution pipes arranged below the descending tank and the ascending tank (gravel layer), flushing the artificial wetland by the treated water from bottom to top, and sending the flushed water into the desilting outlet pipe through the desilting water collection pipes arranged above the descending tank and the ascending tank (gravel layer) to be sent into the desilting tank;
and (4): when the concentration of ammonia nitrogen or organic matters in the treated water or the artificial wetland is too high, the descending pool and the ascending pool are emptied and drained, the water inlet system and the liquid level discharge pipe are closed, and the emptying valve arranged at the outlet of the silt guiding water distribution pipe is opened to discharge sewage, so that the artificial wetland is reoxygenated.
Has the advantages that: (1) according to the invention, the constructed wetland can operate in a low-temperature environment through the arranged liquid level discharge pipes with different water levels, the high-level water outlet valve is opened under the condition of no icing, the low-level water outlet valve is opened after the surface is iced, the constructed wetland operates at a low liquid level, the ice cover formed on the surface layer of the constructed wetland is preserved, and the root system of the aquatic plant is protected; (2) the water distribution of the descending pool adopts the spray heads to spray and fall, so that the water to be treated can carry a large amount of oxygen in the falling process, and compared with the traditional artificial wetland, the oxygen content in the filler in the artificial wetland is high; (3) according to the invention, the silt-discharging pipeline system is arranged in the wetland substrate layer and comprises the silt-guiding water distribution pipe and the silt-guiding water collection pipe, and the operation effect reduction caused by wetland blockage can be effectively prevented by carrying out high-pressure water silt-guiding flushing on the wetland; (4) compared with the traditional aeration flushing by arranging an air pipeline, the aeration flushing device does not need to be provided with a fan room, and has low one-time manufacturing cost; (5) according to the invention, by changing the matrix of the wetland system and comparing with the traditional sand, gravel and the like, a pyrite slag layer is added, iron in the pyrite slag can react with phosphate in the inlet water to form iron phosphate sediments to remove total phosphorus in the inlet water, meanwhile, because reduced sulfur exists in the pyrite slag, denitrifying bacteria can utilize the reduced sulfur as an inorganic electron donor to realize autotrophic denitrification, and under the condition of insufficient organic matters in the inlet water, no additional carbon source is required to be added, so that the method is especially suitable for treating eutrophic water with low organic matter pollution and prominent nitrogen and phosphorus pollution; (6) the invention can drain and dry the wetland by arranging the emptying pipe, and when the content of organic matters or ammonia nitrogen in the treated water or the artificial wetland is higher, the wetland treatment efficiency is improved by draining and drying the wetland to supplement oxygen among the pores of the substrate layer.
Drawings
FIG. 1 is a side cross-sectional view of the present invention;
FIG. 2 is a sectional view taken along line A-A of the present invention;
FIG. 3 is a sectional view taken along line B-B of the present invention;
FIG. 4 is a cross-sectional view taken along line C-C of the present invention;
FIG. 5 is a cross-sectional view taken along line D-D of the present invention.
Detailed Description
Example 1: as shown in fig. 1, the artificial wetland sewage treatment method used in the treatment method comprises a descending pool 1, an ascending pool 2, a sludge discharge pool 3 and a clean water pool 4 which are sequentially arranged, wherein the descending pool 1 and the ascending pool 2, the ascending pool 2 and the sludge discharge pool 3, and the sludge discharge pool 3 and the clean water pool 4 are separated by partition walls 37, and the descending pool 1 and the ascending pool 2 are provided with an aquatic plant layer 5, a gravel sand layer 6, a gravel layer 7, a cobble layer 8, a pyrite slag layer 9, a gravel layer 10 and a sand cushion layer 11 from top to bottom. As an optional application example, the particle size of crushed stone sand selected for the crushed stone sand layer 6 is about 4-8mm, the filling height is about 0.2m, the particle size of crushed stone selected for the crushed stone layer 7 is about 8-16mm, the filling height is 0.30m, the particle size of cobble selected for the cobble layer 8 is about 16-32mm, the filling height is 0.3m, the filling height of the pyrite slag layer 9 is 1.0m, the particle size of gravel selected for the gravel layer 10 is about 100-300mm, the filling height is 0.3m, and the thickness of the sand cushion layer 11 is about 50 mm.
The bottom ends of the descending pool 1 and the ascending pool 2 are used for communicating a water collecting and distributing pipe 12 of the descending pool 1 and the ascending pool 2; the side wall of the clean water tank 4 is provided with a wetland water outlet pipe 41. Specifically, the water collecting and distributing pipes 12 are arranged in the gravel layer 10 of the descending pool 1, as shown in fig. 4, the water collecting and distributing pipes 12 are water pipes which are distributed in the gravel layer 10 of the descending pool 1 in parallel and transversely at intervals, the water collecting and distributing pipes 12 are communicated with the vertically arranged ventilating pipes 29, and in this embodiment, the vertically extending ventilating pipes 29 are arranged in both the descending pool 1 and the ascending pool 2.
As shown in fig. 2, the artificial wetland comprises a water inlet system 13 arranged above the descending pool 1, the water inlet system 13 comprises a wetland water inlet pipe 131 and a plurality of water inlet distribution pipes 132 connected with the wetland water inlet pipe 131 and arranged in parallel, each water inlet distribution pipe 132 is provided with a plurality of nozzles 133 for spraying water upwards, and each water inlet distribution pipe 132 is provided with a descending pool water distribution valve 134. In a specific application, the aquatic plant layer 5 in the descending pond 1 is provided with a water inlet distribution pipe 132, i.e. the water inlet system 13 is arranged on the aquatic plant layer 5 in the descending pond 1. In the artificial wetland in this embodiment, the outlets of the wetland water inlet pipes 131 are respectively connected with a plurality of water inlet distribution pipes 132 which are arranged transversely, and the water inlet amount of the artificial wetland is controlled by a descending pond water distribution valve 134 which is arranged at the inlet of each water inlet distribution pipe 132.
As shown in fig. 2, a water outlet collecting pipe 14 and a plurality of liquid level discharging pipes 15 for discharging at different water levels are arranged above the ascending pool 2, and outlets of the plurality of liquid level discharging pipes 15 are located in the clean water pool 4, and as a preferred mode, the plurality of liquid level discharging pipes include a high water level discharging pipe 151, a medium water level discharging pipe 152 and a low water level discharging pipe 153, and water outlet valves respectively arranged on the liquid level discharging pipes; the method specifically comprises the following steps: and a water outlet collecting pipe 14 is arranged in the gravel sand layer of the ascending pool 2, and the water outlet collecting pipe 14 is connected with a water outlet pipe of the ascending pool. The water outlet pipe of the ascending pool 2 is communicated with the clean water pool 4, the water outlet pipe of the ascending pool 2 is provided with an upper outlet liquid level, a middle outlet liquid level and a lower outlet liquid level which respectively correspond to the ascending pool high liquid level water outlet pipe 151, the ascending pool middle liquid level water outlet pipe 152 and the ascending pool low liquid level water outlet pipe 153, and the three pipelines are respectively provided with a high-level outlet valve 154, a middle-level outlet valve 155 and a low-level outlet valve 156. When the device is applied specifically, the distance between the central line of the water outlet pipe at the high liquid level of the ascending pool and the top end of the gravel sand layer 6 is not less than 200 mm.
As shown in fig. 2 and fig. 3, the constructed wetland of this embodiment includes a silt discharging pipeline system 16, the silt discharging pipeline system includes a submersible pump 161 disposed in the clean water tank 4, a water pump outlet pipe 162 communicated with an outlet of the submersible pump 161, a silt guiding inlet pipe 163 communicated with an outlet of the water pump outlet pipe 162, a plurality of silt guiding water distribution pipes 164 communicated with the silt guiding inlet pipe 163 and disposed at the bottom ends of the downlink tank 1 and the uplink tank 2 in parallel, a water pump outlet valve 165 is disposed on the silt guiding inlet pipe 163, the water pump outlet valve 165 controls the flushing flow entering the silt guiding water distribution pipes 164, and the silt guiding inlet pipe 163 is disposed on the tank wall of the downlink tank 1. As shown in fig. 5, a plurality of silt guiding and distributing pipes 164 are disposed in the gravel layer 10 of the descending pool 1 and the ascending pool 2, a plurality of silt guiding and distributing pipes 164 are laterally disposed in parallel, the outlets of the silt guiding and distributing pipes 164 are provided with an emptying pipe 166 and an emptying valve 167 disposed on the emptying pipe, and the outlet of the emptying pipe 166 is disposed in the silt discharging pool 3.
As shown in fig. 3, the sludge discharge piping system 16 further includes sludge guide and collection pipes 168 disposed in the gravel layer 7 of the descending tank 1 and the ascending tank 2, the sludge guide and collection pipes 168 are also disposed in parallel at the same interval, an outlet of the sludge guide and collection pipe 168 is communicated with a sludge guide and water outlet pipe 169 disposed in the sludge discharge tank 3, and a sludge guide and water outlet valve 170 is disposed on the sludge guide and water outlet pipe 169.
The discharge pipe system 17 at the bottom end of the sludge discharge tank 3 of the embodiment, the discharge pipe system 17 comprises a discharge pipe 171 arranged at the bottom end of the sludge discharge tank 3, the discharge pipe 171 is respectively communicated with a sludge discharge pipeline 172 and a vent pipeline 173, the sludge discharge pipeline 172 is provided with a sludge discharge pipe valve 174, and the vent pipeline 173 is provided with a vent pipeline valve 175. When the artificial wetland normally operates, the emptying pipeline valve 175, the silt discharging pipe valve 174, the silt guiding and discharging water valve 170, the emptying valve and the like 167 are normally closed valves.
In specific application, the water collecting and distributing pipe 12, the water outlet and collecting pipe 14, the silt guiding and distributing pipe 164, the silt guiding and collecting pipe 168 and the like are provided with orifices which are distributed in a downward staggered manner, the aperture of the orifices on the water collecting and distributing pipe 12 and the silt guiding and distributing pipe 164 is not less than 6mm, and the aperture of the orifices on the water outlet and collecting pipe 14 and the silt guiding and collecting pipe 168 is not less than 10 mm.
The artificial wetland sewage treatment method comprises the following steps:
step (1): the method comprises the following steps of building a descending pool 1, an ascending pool 2, a silt discharging pool 3 and a clean water pool 4 which are sequentially connected, introducing sewage to be treated into the artificial wetland through a water inlet system 13 arranged above the descending pool 1, enabling the water inlet system 13 to send the sewage to be treated into the descending pool 1 through a plurality of spray heads 133 arranged in the water inlet system 13 in a spraying and descending manner, enabling the sewage to be treated to sequentially pass through a plant layer 5, a gravel sand layer 6, a gravel layer 7, a goose pebble layer 8, a pyrite slag layer 9 and a gravel layer 10 which are arranged in the descending pool 1, and then sending the sewage to the ascending pool 2 through a water collecting and distributing pipe 12 which is arranged in the gravel layer 10 of the descending pool 1 and is used for communicating the descending pool 1 with the ascending pool 2;
step (2): the sewage sent out from the descending pool 1 passes through a gravel layer 10, a pyrite slag layer 9, a cobble layer 8, a gravel layer 7 and a gravel sand layer 6 which are arranged in the ascending pool 2 in sequence, and then is sent into the clean water pool 4 through a water outlet collecting pipe 14 and a plurality of liquid level discharge pipes 15 which are communicated with the water outlet collecting pipe 14 and have different liquid level discharge heights.
Specifically, when water to be treated enters the water inlet distribution pipes 132 through the wetland water inlet pipe 131, the flow of each water inlet distribution pipe 132 is controlled by opening the water distribution valve 134 of the descending tank, water is sprayed upwards through the spray head 133, the water to be treated is oxygenated in the descending process, uniformly falls into the descending tank 1, sequentially passes through the gravel sand layer 6, the gravel layer 7, the cobble layer 8 and the like, and the root systems of the aquatic plant layers 5 densely distributed in the matrix fillers, and is subjected to the filtering action of the matrix fillers and various microorganism activities of plant roots, so that the water quality is primarily purified; the primarily purified water continuously descends to a pyrite slag layer 9, iron in the pyrite slag layer 9 reacts with phosphate in inlet water to form iron phosphate sediments in the pyrite slag layer 9 so as to remove total phosphorus in the inlet water, and meanwhile, because reduced sulfur exists in the pyrite slag, denitrifying bacteria can utilize the reduced sulfur as an inorganic electron donor to realize autotrophic denitrification; the water purified by the pyrite slag layer 9 continuously goes down into the gravel layer 10, and because a plurality of pores with different sizes exist among the gravels, when the sewage flows through the pores, the flow velocity of the water flow is slowed down due to the blockage of the gravels, and suspended substances in the water can contact with the gravels and settle within a short pore distance; in addition, the rough surface of the gravel can be used for a plurality of microorganisms to adhere and grow, the viscous biomembrane is mainly responsible for absorbing suspended substances, the whole mechanism is that organic matters dissolved in water are absorbed or utilized by the microorganisms to achieve the effect of solid-liquid separation when flowing through the biomembrane on the surface of the gravel, so that the water quality is purified, as the water collecting and distributing pipe 12 is a gravel layer which is communicated with the downward pond 1 and the upward pond 2, the purified water is collected and distributed to the gravel layer 10 in the upward pond 2 through the hole on the water collecting and distributing pipe 12, and then is further purified through the pyrite slag layer 9, the cobble layer 8, the gravel layer 7, the gravel sand layer 6 and the like in the upward pond 2, finally the purified water is collected into the water outlet pipe through the hole on the water outlet collecting pipe 14 and is discharged into the clean water pond 4, when the treated water in the clean water pond 4 reaches a certain water level, and is discharged through a wetland water outlet pipe 41 arranged on the side wall of the clean water tank 4.
And (3): when the artificial wetland is operated in a low-temperature environment, closing the middle water outlet valve 155 and the low water outlet valve 156, opening the high water outlet valve 154 to enable the artificial wetland to be at the highest liquid level, after the surface is frozen, closing the high water outlet valve 154, and opening the low water outlet valve 156 to enable the artificial wetland to be operated at the low liquid level, wherein an ice cover is formed on the surface layer of the artificial wetland to protect the roots of aquatic plants, and selecting the high water outlet pipe 151 to discharge water; when the surface of the artificial wetland is frozen, a low water level water outlet pipe 153 is selected for water outlet;
and (4): when the artificial wetland needs to be desilted, the water inlet system 13 is closed, the high-position water outlet valve 154, the middle-position water outlet valve 155 and the low-position water outlet valve 156 are closed, the artificial wetland is subjected to desilting treatment through the desilting pipeline system 16 communicated with the clean water tank 4, the desilting water outlet valve 170 and the desilting pipe valve 174 are opened, the submersible pump 161 is started, the water outlet pipe valve 162 of the water pump is opened, the clean water tank water is lifted to the desilting water inlet pipe 163, the high-pressure water washes the wetland from bottom to top through the desilting water distribution pipe 164, and the sewage after washing is collected through the desilting water collection pipe 168 and then is sent to the desilting tank 3 and is discharged through the desilting pipeline 172.
And (5): when the concentration of ammonia nitrogen or organic matters in the treated water or the artificial wetland is too high, the water distribution valve 134 of the descending pool is closed, the liquid level discharge pipe 15 is closed, the vent pipeline valve 175 and the vent valve 167 are opened, the descending pool 1 and the ascending pool 2 are emptied and dried, after one day of drying, the substrates of the wetland crushed stone sand layer 12, the gravel layer 11, the cobblestone layer 10, the pyrite slag layer 9, the gravel layer 6, the sand cushion layer 11 and the like are reoxidized, the vent pipeline valve 175 and the vent valve 167 are closed, and the water distribution valve 134 of the descending pool is opened, so that the wetland is recovered to operate.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention is subject to the protection scope of the claims.
Claims (4)
1. The artificial wetland sewage treatment method is characterized by comprising the following steps:
(S1) a descending pool (1), an ascending pool (2), a silt discharging pool (3) and a clean water pool (4) which are connected in sequence are built, sewage to be treated is introduced into the artificial wetland through a water inlet system (13) arranged above the descending pool (1), the sewage to be treated sequentially passes through a plant layer (5), a gravel sand layer (6), a gravel layer (7), a goose pebble layer (8), a pyrite slag layer (9), a gravel layer (10) and a sand cushion layer (11) which are arranged in the descending pool (1), and then is sent into the ascending pool (2) through a water collecting and distributing pipe (12) which is arranged in the gravel layer (10) of the descending pool (1) and is used for communicating the descending pool (1) and the ascending pool (2); the water inlet system (13) comprises a wetland water inlet pipe (131) and a plurality of water inlet distribution pipes (132) which are communicated with the wetland water inlet pipe (131) and arranged in parallel, wherein each water inlet distribution pipe (132) is provided with a plurality of spray heads (133) which spray water upwards;
(S2) the sewage sent out from the descending pool (1) passes through a gravel layer (10), a pyrite slag layer (9), a cobble layer (8), a gravel layer (7) and a gravel sand layer (6) which are arranged in the ascending pool (2) in sequence, and then is sent into the clean water pool (4) through an effluent water collecting pipe (14) and a plurality of liquid level discharge pipes (15) which are communicated with the effluent water collecting pipe (14) and have different liquid level discharge heights;
(S3) performing discharge of the treated water by selecting different liquid level discharge pipes (15) when operating in a low temperature environment;
(S4) when the artificial wetland needs to be desilted, dredging is carried out through a desilting pipeline system (16) communicated with a clean water tank (4), the treated water in the clean water tank is sent to the bottom ends of a descending tank and an ascending tank, the sent treated water washes the artificial wetland from bottom to top, and then the washed sewage is sent to a desilting tank (3); the silt discharging pipeline system (16) comprises a submersible pump (161) arranged in a clear water tank, a water pump outlet pipe (162) communicated with an outlet of the submersible pump (161), a silt guiding water inlet pipe (163) communicated with an outlet of the water pump outlet pipe (162), and a plurality of silt guiding water distribution pipes (164) which are communicated with the silt guiding water inlet pipe (163) and arranged at the bottom ends of the downlink tank (1) and the uplink tank (2) in parallel; the outlets of the silt guiding water distribution pipes (164) are provided with an emptying pipe (166), an emptying valve (167) arranged on the emptying pipe and silt guiding water collecting pipes (168) distributed above the descending tank (1) and the ascending tank (2), the outlets of the silt guiding water collecting pipes (168) are communicated with a silt guiding water outlet pipe (169) arranged in the silt discharging tank (3), and the silt guiding water outlet pipe (169) is provided with a silt guiding water outlet valve (170);
(S5) when the ammonia nitrogen concentration in the artificial wetland is too high, carrying out evacuation treatment on the artificial wetland, closing the water inlet system (13), opening the emptying valve (167), and feeding the sewage in the artificial wetland into the emptying pipe (166) from the silt guiding water distribution pipe (164) and feeding the sewage into the silt discharging pool (3) through the emptying pipe (166);
in the step (S3), the liquid level discharge pipes (15) include a high water level discharge pipe (151), a medium water level discharge pipe (152), and a low water level discharge pipe (153); when the surface of the artificial wetland is not frozen, a high-water-level water outlet pipe (151) is selected to discharge water; when the surface of the artificial wetland is frozen, a low water level water outlet pipe (153) is selected for water outlet.
2. The artificial wetland sewage treatment method according to claim 1, comprising a discharge pipeline system (17) arranged at the bottom end of the sludge discharge tank (3), wherein the discharge pipeline system (17) comprises a discharge pipe (171) arranged at the bottom end of the sludge discharge tank (3), and the discharge pipe (171) is respectively communicated with a sludge discharge pipeline (172) and an emptying pipeline (173).
3. The artificial wetland sewage treatment method according to claim 2, wherein the sludge discharge pipeline (172) is provided with a sludge discharge pipe valve (174), and the emptying pipeline (173) is provided with an emptying pipeline valve (175).
4. The sewage treatment method of the artificial wetland according to claim 1, wherein the gravel sand layer (6) is made of gravel sand with the particle size of 4-8mm and the filling height of 0.2 m; the particle size of the crushed stone selected by the crushed stone layer (7) is 8-16mm, and the filling height is 0.3 m; cobbles selected by the cobble layer (8) have the particle size of 16-32mm and the filling height of 0.3 m; the filling height of the pyrite slag layer (9) is 1.0 m; the particle size of the gravel selected by the gravel layer (10) is 100-300mm, and the filling height is 0.3 m; the thickness of the sand cushion layer (11) is 50 mm.
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| CN100398466C (en) * | 2007-07-20 | 2008-07-02 | 北京市水利科学研究所 | North low-temperature area undercurrent artificial wetland winter operation method |
| CN203833703U (en) * | 2014-04-28 | 2014-09-17 | 沈阳环境科学研究院 | Water level regulating valve set for constructed wetland |
| CN106115929B (en) * | 2016-08-31 | 2019-07-30 | 安徽国祯环保节能科技股份有限公司 | A kind of artificial swamp for sewage treatment |
| CN208265854U (en) * | 2017-12-29 | 2018-12-21 | 星景生态环保科技（苏州）有限公司 | A kind of wetland effluent water level control apparatus |
| CN209651979U (en) * | 2018-12-14 | 2019-11-19 | 南京华创环境技术研究院有限公司 | A kind of composite vertical current artificial wetland |
| CN211999044U (en) * | 2019-08-22 | 2020-11-24 | 南京华创环境技术研究院有限公司 | Composite artificial wetland system for nitrogen and phosphorus removal |
| CN111925047A (en) * | 2020-06-24 | 2020-11-13 | 上海市园林设计研究总院有限公司 | Anti-blocking up-flow vertical subsurface flow constructed wetland system and water quality purification method |
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