CN117164116A - Ecological safety buffer zone system for purifying tail water of town sewage plant - Google Patents
Ecological safety buffer zone system for purifying tail water of town sewage plant Download PDFInfo
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- CN117164116A CN117164116A CN202310699411.3A CN202310699411A CN117164116A CN 117164116 A CN117164116 A CN 117164116A CN 202310699411 A CN202310699411 A CN 202310699411A CN 117164116 A CN117164116 A CN 117164116A
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Abstract
The invention discloses an ecological safety buffer zone system for purifying tail water of a town sewage plant, belonging to the field of water pollution control and treatment and water resource regeneration and recycling. The system comprises an algae oxidation pond treatment unit, a surface flow constructed wetland unit, a horizontal subsurface flow constructed wetland unit, a vertical subsurface flow constructed wetland unit and a water collecting channel, so that tail water of the town sewage plant is effectively consumed, degraded and purified, and the river entering water quality can be ensured; can resist, relieve and reduce the ecological influence of tail water of town sewage plants on the receiving water body.
Description
Technical Field
The invention relates to the field of water pollution control and treatment and water resource regeneration and recycling, in particular to an ecological safety buffer zone system for purifying tail water of town sewage plants.
Technical Field
With the rapid development of towns in China and the improvement of national living standards, the problems of water environment pollution, water resource shortage and the like lead to the increasingly tense water resource allocation and use in China. The water quantity, the treatment process and the discharged water quality treated by the urban sewage treatment plant are directly related to the ecological environment of the surface water. Most rivers are used as the final 'receiving water body' of the effluent of the urban sewage treatment plant, and bear the pollution load brought to the tail water of the urban sewage treatment plant by the river discharge. The sewage is discharged into the surface water environment without treatment or with insufficient treatment degree, and the ecological environment can be directly influenced. Therefore, the method strengthens the discharge control of tail water of the urban sewage treatment plant and has very important significance for protecting the surface water environment.
In order to realize the natural connection of the effluent of the urban sewage treatment plant and the river channel, the urban sewage treatment plant starts to execute stricter pollutant emission standards. Even though the tail water of the sewage plant meets the discharge standard with higher requirements, the treated water body still contains a large amount of organic pollutants, N, P and other conventional compounds, heavy metals, disinfection byproducts, polychlorinated biphenyl, polycyclic aromatic hydrocarbon and other various toxic and harmful substances and personal care products, antibiotics, agriculture and metabolic products, perfluoroalkyl substances, organic phosphate flame retardants, microplastic, estrogen and other various emerging pollutants, and the substances can be discharged into the river water environment along with the tail water, so that the river self-cleaning capacity and the polluted load face limitation, and the structure, the function and the biodiversity of a river biological community face threat.
The reuse of tail water of town sewage plants after advanced treatment is one of important ways for relieving the shortage of global water resources. The main methods of advanced treatment of tail water include physical method, chemical method, biological method, ecological method and combined treatment process of various methods. The method has the problems of high treatment cost, high management and maintenance difficulty, low benefit and the like in different degrees, and is one of the limiting factors that the advanced treatment of tail water in China is not widely developed and practiced at present. In terms of the current advanced sewage treatment technology in China and the situations of water environment protection and water ecological restoration, a treatment process with low energy consumption, high efficiency, ecology and convenience in maintenance and management is urgently required.
The ecological safety buffer area is utilized to treat the tail water of the town sewage plant, which is a novel pollution treatment technology developed in recent years, and the ecological safety buffer area treatment technology in the prior patent technology can realize the tail water purification of the town sewage plant to a certain extent, but has the defects:
(1) The traditional ecological safety buffer area treatment technology only considers physical and chemical indexes, but does not consider biological indexes of the receiving water body; (2) The safety risk assessment of tail water or reclaimed water receiving water bodies of urban sewage treatment plants and the integral river health research are lacked;
(3) The traditional ecological safety buffer area has the advantages of small pollutant treatment range, low operation life and relatively high cost.
Disclosure of Invention
In view of the above, in order to solve the above technical problems, an object of the present invention is to provide an ecological safety buffer zone system for purifying tail water of a municipal sewage plant, so that tail water of the municipal sewage plant is effectively consumed, degraded and purified, and water quality entering a river can be guaranteed; can resist, relieve and reduce the ecological influence of tail water of town sewage plants on the receiving water body.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
an ecological safety buffer zone system for purifying tail water of town sewage plants comprises an algae oxidation pond treatment unit, a surface flow constructed wetland unit, a horizontal subsurface flow constructed wetland unit, a vertical subsurface flow constructed wetland unit and a water collecting channel;
the algae oxidation pond treatment unit is a algae-algae symbiotic system formed by algae and bacterial microorganisms, and a stirring and aerating device is arranged in the system; the algae oxidation pond treatment unit is connected with the surface flow artificial wetland treatment unit, the surface flow artificial wetland treatment unit is communicated with the horizontal subsurface flow artificial wetland treatment unit, the horizontal subsurface flow artificial wetland treatment unit is communicated with the vertical subsurface flow artificial wetland treatment unit, and the vertical subsurface flow artificial wetland treatment unit is collected by the water collecting channel and then discharged into a river.
In some specific technical schemes: the vertical subsurface flow constructed wetland treatment unit is divided into a vertical subsurface flow constructed wetland upward-going pool treatment unit and a vertical subsurface flow constructed wetland downward-going pool treatment unit by using a partition plate, and part of the water discharged from the vertical subsurface flow constructed wetland downward-going pool treatment unit 18 flows back to the surface flow constructed wetland treatment unit 10.
In some specific technical schemes: the bottoms of the surface flow artificial wetland treatment unit, the horizontal subsurface flow artificial wetland treatment unit and the vertical subsurface flow artificial wetland treatment unit are respectively provided with a mud pipe;
and part of the effluent of the algae oxidation pond treatment unit flows back to the water inlet of the algae oxidation pond treatment unit, and part of the effluent of the vertical subsurface flow constructed wetland downward pond treatment unit flows back to the surface flow constructed wetland treatment unit.
In some specific technical schemes: the algal pond treatment unit is provided with a substrate, preferably: the matrix is gravel with the grain diameter of 40-60 mm.
In some specific technical schemes: the surface flow constructed wetland treatment unit is provided with a matrix, and the following preferable steps are that: the matrix is composed of stone cage nets and stones, wherein the stones are filled in the stone cage nets, and further preferable: the particle size of the stone blocks is 40-60 mm.
In some specific technical schemes: the horizontal subsurface flow constructed wetland treatment unit is provided with a filler matrix, and preferably: the packing matrix comprises a stone layer with the grain diameter of 40-60 mm, a pebble or gravel layer with the grain diameter of 20-40 mm, a pyrite composite packing matrix with the grain diameter of 2-6 mm, a non-woven fabric layer and a soil layer with the grain diameter of 5-10 mm from bottom to top, and an aquatic plant layer is arranged on the surface of the packing matrix.
In some specific technical schemes: the vertical subsurface flow constructed wetland upward pond treatment unit is provided with a filler matrix, and preferably: the packing matrix comprises a stone layer with the grain diameter of 40-60 mm, a pebble or gravel layer with the grain diameter of 20-40 mm, a pyrite composite packing matrix with the grain diameter of 2-6 mm, a non-woven fabric layer and a soil layer with the grain diameter of 5-10 mm from bottom to top, and the surface of the packing matrix is provided with a planted aquatic plant layer.
In some specific technical schemes: the vertical subsurface flow constructed wetland downward pool treatment unit is provided with a filler matrix, and preferably: the packing matrix comprises a stone layer with the grain diameter of 40-60 mm, a pebble or gravel layer with the grain diameter of 20-40 mm, a pyrite composite packing matrix with the grain diameter of 2-6 mm, a non-woven fabric layer and a soil layer with the grain diameter of 5-10 mm from bottom to top, and an aquatic plant layer is arranged on the surface of the packing matrix;
and HDPE impermeable geomembranes are paved at the bottoms of the horizontal subsurface flow constructed wetland treatment units or the vertical subsurface flow constructed wetland treatment units.
In some more specific embodiments: an ecologically safe buffer system for purifying town sewage plant tail water, comprising: algae oxidation pond, surface flow artificial wetland, horizontal subsurface flow artificial wetland, vertical subsurface flow artificial wetland and water collecting channel. The algae oxidation pond treatment unit is a bacterial and algal symbiotic system formed by algae and bacterial microorganisms, one side of the algae oxidation pond treatment unit is provided with a water inlet, an external motor-driven spiral stirrer is arranged in the algae oxidation pond treatment unit, an aeration device is arranged at the bottom of the algae oxidation pond treatment unit, the water distribution is connected with the surface flow artificial wetland treatment unit through a connecting pipeline, the surface flow artificial wetland treatment unit is communicated with the horizontal subsurface flow artificial wetland treatment unit through a water distribution pipeline, the horizontal subsurface flow artificial wetland treatment unit is communicated with the vertical subsurface flow artificial wetland treatment unit through a water distribution pipeline, and the vertical subsurface flow artificial wetland treatment unit is collected through a water collecting channel and then discharged into a river; a part of the effluent of the algae pond treatment unit flows back to the water inlet of the algae pond treatment unit, and the vertical subsurface flow constructed wetland treatment unit is divided into a vertical subsurface flow constructed wetland upward pond treatment unit and a vertical subsurface flow constructed wetland downward pond treatment unit by using a baffle plate; a part of water discharged from the vertical subsurface flow constructed wetland downward pool treatment unit flows back to the surface flow constructed wetland treatment unit; the bottoms of the surface flow artificial wetland treatment unit, the horizontal subsurface flow artificial wetland treatment unit and the vertical subsurface flow artificial wetland treatment unit are all provided with mud pipes.
Furthermore, the algae in the algae oxidation pond adopts a daytime photosynthesis and night aeration operation mode, and a large amount of oxygen is released by the algae in the algae oxidation pond by photosynthesis in the daytime, so that a favorable environment is provided for bacteria proliferation and pollutant degradation, and oxygen required by microorganism proliferation and pollutant degradation is provided by the bottom aeration device at night.
Further, the algae oxidation pond is provided with a matrix, the matrix is gravel, the grain size is 40-60 mm, and an adhesion carrier is provided for algae and microorganisms to form a symbiotic system of activated sludge and a biological membrane.
Further, the algae in the algae oxidation pond are one or more of spirogyra, chlorella, tremella, scenedesmus and silk algae.
Further, an external motor in the algae oxidation pond drives a spiral stirrer to rotate at 2000-2999 rpm to promote the mixing of sewage and algae, accelerate the biological reaction rate, adjust the concentration of dissolved oxygen and balance the water temperature in the pond.
Further, a substrate is arranged in the surface flow artificial wetland treatment unit, aquatic plants antagonistic to algae are planted on the surface of the substrate, and aquatic organisms are put in the surface flow artificial wetland treatment unit to prey on the algae.
Further, the vertical subsurface flow constructed wetland is divided into a circulation gallery by the partition board in the middle of the vertical subsurface flow constructed wetland treatment unit, and the water flow direction is changed to better purify the water quality. The water flow direction of the vertical subsurface flow constructed wetland treatment unit is upward and downward, and the vertical subsurface flow constructed wetland treatment unit is divided into an upward pool of the vertical subsurface flow constructed wetland and a downward pool of the vertical subsurface flow constructed wetland.
Furthermore, the pyrite composite filler layer is a core purification layer of a horizontal subsurface flow constructed wetland treatment unit, a vertical subsurface flow constructed wetland upward pool and a vertical subsurface flow constructed wetland treatment unit, and the filler is formed by mixing and granulating pyrite, limestone, volcanic rock and the like according to the volume ratio of 1-3:1:1. The particle size of the pyrite is 2-5mm, the particle size of the limestone is 1-2mm, and the particle size of the volcanic rock is 3-5mm.
Compared with the prior art, the invention has the beneficial effects that:
1. the algae oxidation pond in the ecological safety buffer zone system of the technical scheme is beneficial to fully utilizing photosynthesis, reducing energy consumption and fully playing the photosynthesis and purification roles of algae.
2. According to the technical scheme, the surface flow artificial wetland utilizes the inhibition effect of aquatic plants on the allelopathy of algae to control the algae, and metabolites of the algae and dead algae can serve as carbon sources to provide the carbon sources for subsequent nitrification and denitrification.
3. According to the technical scheme, the traditional constructed wetland is modified, the sludge collection and discharge system in the wetland is newly added, so that the sludge in the wetland can be periodically discharged, the problem of blockage caused by long-term operation of the constructed wetland is solved, the constructed wetland can maintain the optimal treatment capacity, the sewage treatment effect is improved, and the service life of the constructed wetland is prolonged.
4. The system built in the technical scheme of the invention has stable and efficient removal capability for conventional pollutants, and the indexes of COD, ammonia nitrogen, total phosphorus and the like in tail water of town sewage plants are purified from inferior V-type water bodies to surface water IV-type water bodies, so that TN removal rate reaches 80%; the method has 80% capability of removing typical PPCPs and other micro pollutants in the water body 19, and fully plays a role in buffering river ecological health.
5. The ecological river pollutant intercepting and purifying device has the advantages that ecological interception and purifying effects on river pollutants are achieved, the self-purifying capacity of the river is further enhanced, the ecological function of an ecological safety buffer area is fully exerted, and a foundation is laid for the health of the ecological system of the river.
6. The system has the advantages of high treatment load, good denitrification and dephosphorization effects, good removal effect on emerging micro pollutants, simple and convenient operation and the like, and has higher social and economic benefits and ecological benefits.
Drawings
FIG. 1 is a schematic diagram of a structure of a physiological safety buffer system;
FIG. 2 is a schematic view of an aeration apparatus;
FIG. 3 is a schematic structural view of a horizontal subsurface flow constructed wetland;
FIG. 4 is a schematic structural view of a vertical subsurface flow constructed wetland;
in the figure: 1. the algae oxidation pond, 2, a spiral stirrer, 3, a water inlet, 4, an external motor, 5, an air supply branch pipe, 6, an aeration device, 7, a valve switch, 8, an air supply main pipe, 9, a connecting pipeline, 10, a surface flow artificial wetland, 11, a gabion, 12, a mud collecting tank, 13, a mud discharging pipe, 14, a water distribution pipeline, 15, a water distribution area, 16, a horizontal subsurface flow artificial wetland, 17, a vertical subsurface flow artificial wetland, 18, a vertical subsurface flow artificial wetland upward pool, 19, a vertical subsurface flow artificial wetland downward pool, 20, a baffle plate, 21 and a water collecting channel.
Detailed Description
The invention will be described in further detail below with reference to the drawings and the detailed description.
The pyrite composite filler matrix is pyrite, limestone and volcanic rock according to the volume ratio of 2:1:1, mixing and granulating.
Example 1
Fig. 1 to 4 show an embodiment of an ecologically safe buffer system for purifying tail water of town sewage plants according to the present invention. Referring to fig. 1 to 4, the ecologically safe buffer system includes: the system comprises an algae oxidation pond 1, a surface flow constructed wetland 10, a horizontal subsurface flow constructed wetland 16, a vertical subsurface flow constructed wetland 17 and a water collecting channel 21, wherein an algae oxidation pond 1 treatment unit is a zoon system formed by algae and bacterial microorganisms, one side of the algae oxidation pond 1 treatment unit is provided with a water inlet 3, an external motor-driven 4 spiral stirrer 2 is arranged in the algae oxidation pond, an aeration device 6 is arranged at the bottom of the algae oxidation pond, the surface flow constructed wetland treatment unit 10 is connected with the surface flow constructed wetland treatment unit 10 through a connecting pipeline 9 to distribute water, the surface flow constructed wetland treatment unit 10 is communicated with the horizontal subsurface flow constructed wetland treatment unit 16 through a water distribution pipeline 14 of a water distribution area 15 to distribute water, the horizontal subsurface flow constructed wetland treatment unit 16 is communicated with the vertical subsurface flow constructed wetland treatment unit 17 through a water distribution pipeline 14 of the water distribution area 15, and the vertical subsurface flow constructed wetland treatment unit 17 is collected through the water collecting channel 21 and discharged into a river;
a part of water discharged from the algae pond treatment unit 1 flows back to the water inlet 2 of the algae pond treatment unit 1, and the vertical subsurface flow constructed wetland treatment unit 17 is divided into a vertical subsurface flow constructed wetland upward pond treatment unit 18 and a vertical subsurface flow constructed wetland downward pond treatment unit 19 by a partition plate 20; a part of water discharged from the vertical subsurface flow constructed wetland downward pool treatment unit 18 flows back to the surface flow constructed wetland treatment unit 10; the bottoms of the surface flow constructed wetland treatment unit 10, the horizontal subsurface flow constructed wetland treatment unit 16 and the vertical subsurface flow constructed wetland treatment unit 17 are respectively provided with a mud pipe and a valve 13, so that the phenomena of silt and blockage of each unit are slowed down, the treatment effect of a wetland system is improved, and the service life of the wetland system is prolonged.
Example 1
As shown in fig. 1, the algae-laden pond 1 adopts an operation mode of photosynthesis in the daytime and aeration at night. Algae release a large amount of O by photosynthetic process in daytime 2 Providing a required electron donor for degrading organic matters by heterotrophic bacteria and oxidizing ammonia nitrogen by autotrophic bacteria. O released by bacteria using algae 2 Aerobic respiration is carried out to decompose organic matters into inorganic matters with small molecules. At the same time, the bacteria release a large amount of CO during respiration 2 Can be used as a carbon source required in the growth of algae for the propagation of algae. Algae use solar energy as energy source, CO 2 The novel algae cells are synthesized for the carbon source, so that a rich algae bacterial system is quickly established in the efficient algae pond 1, which is beneficial to removing various pollutants in sewage and reducing CO in air 2 And (5) discharging. The aeration device 6 at the bottom provides microorganism degradation organic matters and self-proliferation oxygen for the algae oxidation pond 1 at night.
The algae oxidation pond 1 is provided with a matrix, the matrix is gravel, the grain size is 40-60 mm, an adhesion carrier is provided for algae and microorganisms, a symbiotic system of activated sludge and a biological membrane is formed, and the removal efficiency of the algae oxidation pond 1 is improved.
The algae in the algae oxidation pond 1 are one or more of spirogyra, chlorella, tremella, scenedesmus and silk algae. An external motor 4 in the alga oxidation pond 1 drives a spiral stirrer 2 to rotate at 2000-2999 rpm to promote the mixing of sewage and alga, accelerate the biological reaction rate, adjust the concentration of dissolved oxygen and balance the water temperature of the alga oxidation pond 1. The algae oxidation pond 1 is provided with a reflux device, water from the algae oxidation pond 1 flows back to the water inlet 3, and further sewage is degraded.
As shown in fig. 2, an aeration device 6 is arranged at the bottom of the algae oxidation pond 1, an aeration end of the aeration device 6 is connected with an air supply main pipe 8, the outer side of the air supply main pipe 8 is connected with an air supply branch pipe 5, and a valve 7 is arranged at the end part of the air supply branch pipe 5.
As shown in fig. 1, the surface flow artificial wetland treatment unit 10 is provided with a filler matrix, the matrix is composed of a gabion mesh 11 and stones, the gabion mesh 11 is internally provided with the stones, wherein the bottom of a river is prevented from being washed by water flow, the specification of the gabion mesh 11 is 2 x 1m, the particle size of the stones is 40-60 mm, aquatic plants antagonistic to algae are planted on the surface of the matrix, and the surface flow artificial wetland treatment unit 10 is used for feeding aquatic organisms to prey algae. The planted aquatic plants comprise one or a combination of more of kuh-grass, goldfish algae, reed, duckweed, peanut and canna, and the planting density is 10-30 plants/m 2 The plant height is 40-120 cm, and the root system is carried with soil. The aquatic organisms include one or more of daphnia hyaline, daphnia gracilis, daphnia jugularis, daphnia fraxinus, and daphnia fuzziae.
HDPE impermeable geomembrane is paved at the bottom of the surface flow constructed wetland treatment unit 10, the mud collecting groove 12 is arranged at the center, the slopes of the two sides of the mud collecting groove are 3% -6%, the mud discharging pipe 13 is arranged at the center of the bottom of the mud collecting groove 12, and a mud discharging pipe valve is arranged at one end of the mud discharging pipe 13.
As shown in fig. 1 and 3, a filler matrix is arranged in the horizontal subsurface flow constructed wetland treatment unit 16, the composition structure of the filler matrix comprises a stone block layer 16-5 with the grain diameter of 40-60 mm, a pebble or pebble layer 16-4 with the grain diameter of 20-40 mm, a pyrite composite filler matrix 16-3 with the grain diameter of 2-6 mm, a non-woven fabric layer 16-2 and a soil layer 16-1 with the grain diameter of 5-10 mm from bottom to top, and aquatic plants are planted on the surface of the filler matrix. The setting proportion of the filler layer in the horizontal subsurface flow constructed wetland treatment unit 16 is a stone block layer 16-5: gravel layer 16-4: pyrite composite filler 16-3: soil layer 16-1 is 3:3:4:1. the aquatic plants are selected from one or more of herba Alternantherae, caulis Zizaniae Caduciflorae, typha, herba Musae, rhizoma Acori Calami, herba Eichhorniae, herba Nymphaeae, herba Spirodelae, and herba Euphorbiae Lathyridis. The planting density is10-30 plants/m 2 The plant height is 40-120 cm, and the root system is carried with soil.
The pyrite composite filler layer 16-3 is a core purification layer of the horizontal subsurface flow constructed wetland treatment unit 16, and the filler is formed by mixing and granulating pyrite, limestone, volcanic rock and the like according to the volume ratio of 2:1:1. The particle size of the pyrite is 2-5mm, the particle size of the limestone is 1-2mm, and the particle size of the volcanic rock is 3-5mm. The void ratio of the composite filler is 20% -40%.
HDPE impermeable geomembrane 16-6 is paved at the bottom of the horizontal subsurface flow constructed wetland treatment unit 16, the mud collecting groove 12 is arranged at the center, the slopes of the two sides of the mud collecting groove 12 are 3% -6%, the mud discharging pipe 13 is arranged at the center of the bottom of the mud collecting groove 12, and a mud discharging pipe valve is arranged at one end of the mud discharging pipe 13.
As shown in fig. 1 and 4, the vertical subsurface flow constructed wetland treatment unit 17 is divided into a vertical flow constructed wetland upward tank 18 and a vertical flow constructed wetland downward tank 19 by a partition 20 in the vertical subsurface flow constructed wetland treatment unit 17. The vertical subsurface flow constructed wetland treatment unit 17 is divided into a circulation corridor, the water flow direction is firstly upward and then downward, and the water flow direction is changed to better purify the water quality.
The vertical subsurface flow constructed wetland upward pond treatment unit 18 is provided with a filler matrix, the composition structure of the filler matrix is composed of a stone block layer 18-5 with the grain diameter of 40-60 mm, a pebble or gravel layer 18-4 with the grain diameter of 20-40 mm, a pyrite composite filler matrix 18-3 with the grain diameter of 2-6 mm (composed of pyrite, limestone, volcanic rock and the like by mixing and granulating according to the volume ratio of 2:1:1), a non-woven fabric layer 18-2 and a soil layer 18-1 with the grain diameter of 5-10 mm in sequence from bottom to top, and aquatic plants are planted on the surface of the filler matrix.
The setting proportion of the filler layer in the vertical subsurface flow constructed wetland upward pool treatment unit 18 is a stone block layer 18-5: gravel layer 18-4: 18-3 (mixing and granulating pyrite, limestone, volcanic rock and the like according to the volume ratio of 2:1:1): soil layer 18-1 is 3:3:4:1. the planted aquatic plant comprises one or more of canna, rhizoma Acori Graminei, rhizoma Iridis, herba Alternantherae, and herba Lythri. The planting density is 10-30 plants/m 2 The plant height is 40-120 cm, and the root system is carried with soil.
The vertical subsurface flow constructed wetland down-flow pond 19 treatment unit is provided with a filler matrix, the composition structure of the filler matrix is composed of a stone block layer 19-5 with the grain diameter of 40-60 mm, a pebble or gravel layer 19-4 with the grain diameter of 20-40 mm, a pyrite composite filler matrix (composed of pyrite, limestone, volcanic rock and the like mixed and granulated according to the volume ratio of 2:1:1) 19-3 with the grain diameter of 2-6 mm, a non-woven fabric layer 19-2 and a soil layer 19-1 with the grain diameter of 5-10 mm from bottom to top, and aquatic plants are planted on the surface of the filler matrix. The setting proportion of the filler layer in the vertical subsurface flow constructed wet underground pool processing unit 19 is a block stone layer 19-5: gravel layer 19-4: pyrite composite packing 19-3 (mixing and granulating pyrite, limestone, volcanic rock and the like according to the volume ratio of 2:1:1): soil layer 19-1 is 3:3:4:1. the planted aquatic plant comprises one or more of canna, rhizoma Acori Graminei, rhizoma Iridis, herba Alternantherae, and herba Lythri. The planting density is 10-30 plants/m 2 The plant height is 40-120 cm, and the root system is carried with soil.
HDPE impermeable geomembranes 18-6 and 19-6 are paved at the bottom of the vertical subsurface flow constructed wetland treatment unit 17, a mud collecting groove 12 is arranged at the center, slopes at two sides of the mud collecting groove are 3% -6%, a mud discharging pipe 13 is arranged at the center of the bottom of the mud collecting groove 12, and a mud discharging pipe valve is arranged at one end of the mud discharging pipe 13.
The side surface of the vertical subsurface flow constructed wetland treatment unit 17 adjacent to the water collecting channel 21 is provided with a uniform collecting pipe, and the uniform collecting pipe is discharged into a river through the water collecting channel 21. The effluent of the vertical subsurface flow constructed wetland downward pool treatment unit 19 flows back to the horizontal subsurface flow constructed wetland treatment unit 16.
The ecological safety buffer zone system for purifying the biochemical tail water of the town sewage plant adopts a continuous water inlet mode, and the running time is 6 months.
Wherein the hydraulic retention time of the algae oxidation pond is 2.5d, aeration is adopted at night, and the aeration rate is 0.125m 3 And/h, the aeration time is 12 hours, the rotation speed of the spiral stirrer driven by the algae oxidation pond is 2500rpm, and a large amount of O is released by algae in daytime through photosynthesis 2 Providing a required electron donor for degrading COD (chemical oxygen demand) by heterotrophic bacteria and oxidizing ammonia nitrogen by autotrophic bacteria, and ensuring sufficient oxygen amount of an algae oxidation pond for microorganisms by artificial aeration at nightThe average total concentration of the inflow COD, ammonia nitrogen, total phosphorus and 19 typical PPCPs of the algae oxidation pond are respectively 50mg/L, 5mg/L, 12mg/L, 0.5mg/L and 1 mug/L, and the average total concentration of the outflow COD, ammonia nitrogen, total phosphorus and 19 typical PPCPs is respectively 28mg/L, 2.5mg/L, 11mg/L, 0.45mg/L and 803ng/L.
The hydraulic retention time of the surface flow constructed wetland is 2.5d, the surface flow constructed wetland is also in an aerobic state, the degradation and nitrification are further improved, the stone cage placed on the surface flow constructed wetland can effectively adsorb and remove TP, the surface flow constructed wetland can directly photodegrade PPCPs which are easy to photodegradation by sunlight, the surface flow constructed wetland is used for purifying effluent water quality indexes COD, ammonia nitrogen, total phosphorus and the average value of the total concentration of 19 typical PPCPs are respectively 25mg/L, 1.5mg/L, 10mg/L, 0.35mg/L and 615ng/L (the running time is half year, no blockage is caused yet, and a sludge discharge pipe is not arranged in the example).
The hydraulic retention time of the horizontal subsurface flow constructed wetland is 2d, the horizontal subsurface flow constructed wetland is an ideal place where denitrification reaction occurs due to lack of continuous effective oxygen supply, so that effluent of the surface flow constructed wetland can be effectively denitrified, denitrification reaction occurs as the most effective way for removing nitrogen in sewage, pyrite filled in the horizontal subsurface flow constructed wetland can be used for enhancing denitrification and dephosphorization, anaerobic and adsorption removal can be carried out on the surface flow constructed wetland effluent PPCPs by the horizontal subsurface flow constructed wetland in an anoxic state and the pyrite, and the average value of the water quality index COD, ammonia nitrogen, total phosphorus and the total concentration of 19 typical PPCPs of the surface flow constructed wetland is 23.6mg/L, 1.46mg/L, 5.9mg/L, 0.24mg/L and 489ng/L respectively.
Wherein the hydraulic retention time of the artificial wetland on the vertical subsurface flow is 1.5d, and the hydraulic retention time of the artificial wetland on the vertical subsurface flow is 2d. The vertical subsurface flow up-flow constructed wetland is in an anoxic state, the effluent of the upper-level horizontal subsurface flow constructed wetland and nitrified nitrogen in the vertical subsurface flow down-flow constructed wetland are further effectively denitrified, the vertical subsurface flow down-flow constructed wetland has effective oxygen supply, is an ideal place where organic matters easy to oxidize and PPCPs occur, and fillers in the vertical subsurface flow constructed wetland adsorb and remove TP and PPCPs, and the average value of the effluent quality index COD, ammonia nitrogen, total phosphorus of the vertical subsurface flow constructed wetland and the total concentration average value of 19 typical PPCPs is respectively 22mg/L, 1.2mg/L, 3mg/L, 0.20mg/L and 125ng/L.
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 (8)
1. An ecological safety buffer zone system for purifying tail water of town sewage plants, which is characterized in that: the system comprises an algae oxidation pond treatment unit, a surface flow constructed wetland unit, a horizontal subsurface flow constructed wetland unit, a vertical subsurface flow constructed wetland unit and a water collecting channel;
the algae oxidation pond treatment unit is a algae-algae symbiotic system formed by algae and bacterial microorganisms, and a stirring and aerating device is arranged in the system; the algae oxidation pond treatment unit is connected with the surface flow artificial wetland treatment unit, the surface flow artificial wetland treatment unit is communicated with the horizontal subsurface flow artificial wetland treatment unit, the horizontal subsurface flow artificial wetland treatment unit is communicated with the vertical subsurface flow artificial wetland treatment unit, and the vertical subsurface flow artificial wetland treatment unit is collected by the water collecting channel and then discharged into a river.
2. An ecologically safe buffer system for purifying town sewage plant tail water as claimed in claim 1, wherein: the vertical subsurface flow constructed wetland treatment unit is divided into a vertical subsurface flow constructed wetland upward-going pool treatment unit and a vertical subsurface flow constructed wetland downward-going pool treatment unit by using a partition plate, and part of the water discharged from the vertical subsurface flow constructed wetland downward-going pool treatment unit 18 flows back to the surface flow constructed wetland treatment unit 10.
3. An ecologically safe buffer system for purifying town sewage plant tail water as claimed in claim 1, wherein: the bottoms of the surface flow artificial wetland treatment unit, the horizontal subsurface flow artificial wetland treatment unit and the vertical subsurface flow artificial wetland treatment unit are respectively provided with a mud pipe;
and part of the effluent of the algae oxidation pond treatment unit flows back to the water inlet of the algae oxidation pond treatment unit, and part of the effluent of the vertical subsurface flow constructed wetland downward pond treatment unit flows back to the surface flow constructed wetland treatment unit.
4. An ecologically safe buffer system for purifying town sewage plant tail water as claimed in claim 1, wherein: the algal pond treatment unit is provided with a substrate, preferably: the matrix is gravel with a particle size of 40-60 mm.
5. An ecologically safe buffer system for purifying town sewage plant tail water as claimed in claim 1, wherein: the surface flow constructed wetland treatment unit is provided with a matrix, and the following preferable steps are that: the matrix is composed of stone cage nets and stones, wherein the stones are filled in the stone cage nets, and further preferable: the particle size of the stone blocks is 40-60 mm.
6. An ecologically safe buffer system for purifying town sewage plant tail water as claimed in claim 1, wherein: the horizontal subsurface flow constructed wetland treatment unit is provided with a filler matrix, and preferably: the composite structure of the filler matrix comprises a stone layer with the grain diameter of 40-60 mm, a pebble or gravel layer with the grain diameter of 20-40 mm, a pyrite composite filler matrix with the grain diameter of 2-6 mm, a non-woven fabric layer and a soil layer with the grain diameter of 5-10 mm from bottom to top, and an aquatic plant layer is arranged on the surface of the filler matrix.
7. An ecologically safe buffer system for purifying town sewage plant tail water as claimed in claim 1, wherein: the vertical subsurface flow constructed wetland upward pond treatment unit is provided with a filler matrix, and preferably: the composite structure of the filler matrix comprises a stone layer with the grain diameter of 40-60 mm, a pebble or gravel layer with the grain diameter of 20-40 mm, a pyrite composite filler matrix with the grain diameter of 2-6 mm, a non-woven fabric layer and a soil layer with the grain diameter of 5-10 mm from bottom to top, and a planted aquatic plant layer is arranged on the surface of the filler matrix.
8. An ecologically safe buffer system for purifying town sewage plant tail water as claimed in claim 1, wherein: the vertical subsurface flow constructed wetland downward pool treatment unit is provided with a filler matrix, and preferably: the packing matrix comprises a stone layer with the grain diameter of 40-60 mm, a pebble or gravel layer with the grain diameter of 20-40 mm, a pyrite composite packing matrix with the grain diameter of 2-6 mm, a non-woven fabric layer and a soil layer with the grain diameter of 5-10 mm from bottom to top, and an aquatic plant layer is arranged on the surface of the packing matrix;
and HDPE impermeable geomembranes are paved at the bottoms of the horizontal subsurface flow constructed wetland treatment units or the vertical subsurface flow constructed wetland treatment units.
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| CN202310699411.3A CN117164116A (en) | 2023-06-14 | 2023-06-14 | Ecological safety buffer zone system for purifying tail water of town sewage plant |
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| CN202310699411.3A CN117164116A (en) | 2023-06-14 | 2023-06-14 | Ecological safety buffer zone system for purifying tail water of town sewage plant |
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| CN202310699411.3A Pending CN117164116A (en) | 2023-06-14 | 2023-06-14 | Ecological safety buffer zone system for purifying tail water of town sewage plant |
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