CN111762959A - System and method for purifying aquaculture wastewater - Google Patents
System and method for purifying aquaculture wastewater Download PDFInfo
- Publication number
- CN111762959A CN111762959A CN202010429386.3A CN202010429386A CN111762959A CN 111762959 A CN111762959 A CN 111762959A CN 202010429386 A CN202010429386 A CN 202010429386A CN 111762959 A CN111762959 A CN 111762959A
- Authority
- CN
- China
- Prior art keywords
- layer
- wastewater
- myriophyllum
- artificial wetland
- river sand
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
-
- 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
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
-
- 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
- C02F2101/30—Organic compounds
-
- 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
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/20—Nature of the water, waste water, sewage or sludge to be treated from animal husbandry
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- 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
- C02F7/00—Aeration of stretches of water
Abstract
The invention relates to the technical field of wastewater treatment, in particular to a system and a method for purifying aquaculture wastewater. The invention provides a system for purifying aquaculture wastewater, which comprises an aeration tank, a front-end regulation and biological matrix treatment tank, a three-stage myriophyllum viridis constructed wetland and an underflow percolation advanced treatment tank which are sequentially communicated. The invention utilizes the aeration tank to improve the dissolved oxygen content of the culture wastewater and provide sufficient oxygen for aerobic microorganisms in the front-end regulation and biological matrix treatment tank; then, nitrogen and phosphorus are adsorbed and degraded by using a front-end regulation and biological matrix treatment tank, and substances harmful to growth of the myriophyllum viridis are intercepted at the same time, so that the normal growth of the myriophyllum viridis is ensured; in the myriophyllum viridis artificial wetland, the myriophyllum viridis is used for absorbing nitrogen and phosphorus in wastewater and adsorbing and enriching heavy metals and toxic and harmful substances; and finally, treating the residual pollutants by a subsurface flow percolation advanced treatment pool to obtain effluent meeting the discharge standard.
Description
Technical Field
The invention relates to the technical field of wastewater treatment, in particular to a system and a method for purifying aquaculture wastewater.
Background
The breeding industry is an important component of agriculture and rural economy in China, and intensive livestock and poultry breeding has important practical significance in increasing income of farmers and promoting development of rural economy. However, the wastewater discharged by the large-scale farm every day is large and concentrated, contains high total nitrogen, total phosphorus, ammonia nitrogen, nitrate nitrogen and other pollutants and a large amount of suspended matters, and if the wastewater is directly discharged without being treated, surface water, soil and underground water are polluted, so that the drinking water safety in rural areas is influenced, and even the health of residents is endangered.
Chinese patent CN201920395888.1 discloses a biological reaction system for purifying livestock and poultry breeding wastewater by microalgae, which mainly comprises a wastewater tank, a microalgae purification plate, a driving motor and fan blades; chinese patent CN201621257087.1 discloses a biological treatment device for treating the tail end of cultivation wastewater, which comprises a fixed soft rope, a suspension tray, a filling matrix and a degradation biological layer. The device mainly carries out biochemical treatment on the aquaculture wastewater, but has small treatment capacity, poor system impact resistance, high operation and maintenance cost and difficult long-term stable reaching of the tail end wastewater to the discharge standard, and is easily influenced by C/N unbalance.
Disclosure of Invention
The system provided by the invention has large treatment capacity and excellent system impact resistance, is suitable for treating a large amount of wastewater discharged by a large-scale farm, and can ensure that the treated effluent can stably reach the discharge standard for a long time; the C/N ratio of the waste water is not influenced; the system provided by the invention has the advantages of simple structure, low operation and maintenance cost and better application prospect.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a system for purifying aquaculture wastewater, which comprises an aeration tank, a front-end regulation and biological matrix treatment tank, a three-stage myriophyllum viridis constructed wetland and an underflow percolation advanced treatment tank which are sequentially communicated.
Preferably, the front end conditioning and bio-matrix treatment basin is filled with straw.
Preferably, the three-level myriophyllum elatinoid artificial wetland comprises a first-level myriophyllum elatinoid artificial wetland, a second-level myriophyllum elatinoid artificial wetland and a third-level myriophyllum elatinoid which are sequentially communicated; the areas of the first-stage myriophyllum viridis artificial wetland, the second-stage myriophyllum viridis artificial wetland and the third-stage myriophyllum viridis artificial wetland are 600-1200 m independently2(ii) a The planting amount of the first-stage myriophyllum viridis artificial wetland, the second-stage myriophyllum viridis artificial wetland and the third-stage myriophyllum viridis artificial wetland is independently 2-3 kg/m2。
Preferably, the interior of the subsurface flow filtration depth treatment pool is filled with mixed filler; the mixed filler comprises a first river sand layer, a red soil layer, a second river sand layer, a zeolite layer, a third river sand layer, an activated carbon layer, a fourth river sand layer, a bentonite layer, a fifth river sand layer, a volcanic stone layer, a sixth river sand layer and a slag layer which are arranged from bottom to top in sequence; and the water inlet of the subsurface flow percolation deep treatment tank is arranged at the bottom of the mixed filler.
Preferably, the heights of the first river sand layer, the red soil layer, the second river sand layer, the zeolite layer, the third river sand layer, the activated carbon layer, the fourth river sand layer, the bentonite layer, the fifth river sand layer, the volcanic stone layer, the sixth river sand layer and the slag layer are independently 4.5-5 cm; and the volume of the mixed filler accounts for 80-90% of the volume of the subsurface flow percolation deep treatment pool.
Preferably, the grain sizes of the river sands in the first sand river layer, the second sand river layer, the third sand river layer, the fourth sand river layer, the fifth sand river layer and the sixth sand river layer are independently 1-2 mm; the particle size of the red soil in the red soil layer is 0.2-2 mm; the particle size of zeolite in the zeolite layer is 2-3 mm; the particle size of the activated carbon in the activated carbon layer is 3 mm; the particle size of the bentonite in the bentonite layer is 0.2-2 mm; the particle size of the volcanic rock in the volcanic rock layer is 5-10 mm; the grain size of the furnace slag in the furnace slag layer is 0.5-5 mm.
Preferably, the system further comprises a sedimentation tank, and a water inlet of the sedimentation tank is a breeding wastewater inlet; the water outlet of the sedimentation tank is communicated with the water inlet of the aeration tank.
The invention also provides a method for purifying the aquaculture wastewater based on the system of the technical scheme, which comprises the following steps:
conveying the culture wastewater to an aeration tank for oxygenation to obtain oxygen-containing culture wastewater;
conveying the oxygen-containing aquaculture wastewater to a front-end regulation and biological matrix treatment tank for preliminary nitrogen and phosphorus removal to obtain first treatment wastewater;
conveying the first treated wastewater to a three-level myriophyllum green artificial wetland for deep nitrogen and phosphorus removal to obtain second treated wastewater;
and conveying the second treated wastewater to a subsurface flow percolation advanced treatment tank for filtering to obtain effluent.
The invention also provides a method for purifying the aquaculture wastewater based on the system of the technical scheme, which comprises the following steps:
conveying the aquaculture wastewater to a sedimentation tank for sedimentation treatment, and then conveying the aquaculture wastewater to an aeration tank for oxygenation to obtain oxygen-containing aquaculture wastewater;
conveying the oxygen-containing aquaculture wastewater to a front-end regulation and biological matrix treatment tank for preliminary nitrogen and phosphorus removal to obtain first treatment wastewater;
conveying the first treated wastewater to a three-level myriophyllum green artificial wetland for deep nitrogen and phosphorus removal to obtain second treated wastewater;
and conveying the second treated wastewater to a subsurface flow percolation advanced treatment tank for filtering to obtain effluent.
Preferably, the breeding wastewater is wastewater discharged by a large-scale pig farm.
The invention provides a system for purifying aquaculture wastewater, which comprises an aeration tank, a front-end regulation and biological matrix treatment tank, a three-stage myriophyllum viridis constructed wetland and an underflow percolation advanced treatment tank which are sequentially communicated. The invention utilizes the aeration tank to improve the dissolved oxygen content (DO value) of the aquaculture wastewater and provide sufficient oxygen for aerobic microorganisms in the front-end regulation and biological matrix treatment tank; then the front-end regulation and biological matrix treatment tank is used for adsorbing and degrading nitrogen and phosphorus, and simultaneously intercepting substances (specifically high-concentration NH) harmful to growth of the myriophyllum viridis4 +-N and heavy metals) to ensure normal growth of the watermifoil green algae; in the myriophyllum viridis artificial wetland, the myriophyllum viridis is used for absorbing nitrogen and phosphorus in wastewater and adsorbing and enriching heavy metals and toxic and harmful substances; and finally, treating the residual pollutants by a subsurface flow percolation advanced treatment pool to obtain effluent meeting the discharge standard.
Drawings
FIG. 1 is a schematic diagram of a first-stage Foliumet green constructed wetland in an embodiment of the invention;
FIG. 2 is a schematic diagram of a second-stage Foliumligus viridis constructed wetland in an embodiment of the invention;
FIG. 3 is a flow chart of the process for purifying aquaculture wastewater according to the embodiment of the present invention.
Detailed Description
The invention provides a system for purifying aquaculture wastewater, which comprises an aeration tank, a front-end regulation and biological matrix treatment tank, a three-stage myriophyllum viridis constructed wetland and an underflow percolation advanced treatment tank which are sequentially communicated.
The system provided by the invention comprises an aeration tank, which is used for increasing the dissolved oxygen content (DO value) of the aquaculture wastewater and providing sufficient oxygen for aerobic microorganisms in a front-end regulation and biological matrix treatment tank. As an embodiment of the invention, the bottom area of the aeration tank is 30m2Effective volume of 120m3. As an embodiment of the invention, the aeration tank adopts a blast aeration device to carry out oxygenation; the blast aeration device preferably comprises an aeration fan and an aerator. As an embodiment of the present invention, the aeration fan is disposed outside the aeration tank, and the aerator is disposed at the bottom inside the aeration tank, and is preferably a perforated pipe. In the invention, the aperture of the porous pipe is preferably 5mm, more preferably 4mm, and the pitch of the porous pipe is preferably 15-25 cm, more preferably 20 cm; the porous pipe is preferably made of PVC.
As an embodiment of the invention, the system provided by the invention further comprises a sedimentation tank, wherein a water inlet of the sedimentation tank is communicated with a water outlet of the aquaculture wastewater; the water outlet of the sedimentation tank is communicated with the water inlet of the aeration tank. The front end of the aeration tank is provided with the sedimentation tank, so that suspended matters in the culture wastewater can be removed. The invention has no special requirements on the structure of the sedimentation tank, and the sedimentation tank which is well known by the technical personnel in the field can be adopted. In the invention, the volume of the aquaculture wastewater is preferably 0.5-3% of the volume of the sedimentation tank, and more preferably 1%.
The system provided by the invention comprises a front-end adjusting and biological matrix treating tank communicated with a water outlet of the aeration tank, can effectively adsorb and degrade nitrogen and phosphorus with higher concentration, intercepts substances harmful to growth of the myriophyllum viridis, and ensures normal growth of the myriophyllum viridis. As an embodiment of the invention, the front-end adjusting and biological matrix treatment pool is filled with straws, and the straws can provide good C/N balanced environment and film hanging condition for microorganisms and have strong impact resistance. In a particular embodiment of the invention, the straw is placed in a bale in the front-end conditioning and bio-substrate treatment basin, preferably with a weight above the straw. The arrangement mode of the straws is not particularly limited, and the straws can be controlled below the liquid level of the wastewater.
In a specific embodiment of the invention, the straw is replenished every 6 months, and when new straw is replenished, there is no need to dispose of old straw, as the old straw is substantially completely degraded by aerobic microorganisms in the head conditioning and bio-matrix treatment tanks. As an embodiment of the present invention, the bottom area of the front-end conditioning and bio-substrate treatment tank is 456m2An effective volume of 1368m3And the filling amount of the straws in the front end adjusting and biological matrix treating pond is 10 t.
The system provided by the invention comprises the three-stage myriophyllum elatinoides artificial wetland communicated with the water outlet of the front-end regulation and biological matrix treatment pool, the cultivation wastewater is treated by using the myriophyllum elatinoides with high nitrogen and phosphorus resistance and large biomass, the myriophyllum elatinoides can absorb nitrogen and phosphorus in a water body, the microenvironment for the cultivation wastewater treatment can be improved, and the removal of the nitrogen and phosphorus by microorganisms and bottom mud is promoted.
In the invention, the myriophyllum viridis can directly absorb available nutrients such as nitrogen, phosphorus and the like in the water body from the wastewater through absorption and assimilation; ammonium salt, nitrate and phosphate in the wastewater can be absorbed by the myriophyllum viridis through the absorption and assimilation, and finally the myriophyllum viridis leaves the water body through harvesting the myriophyllum viridis; the root system of the myriophyllum viridis can adsorb and enrich heavy metals and toxic and harmful substances; the roots, stems and leaves of the myriophyllum viridis have the function of absorbing and enriching heavy metals, wherein the absorption capacity of the roots is strongest; the roots of the myriophyllum viridis are densely and well interwoven, so that the myriophyllum viridis can intercept and adsorb solid particles; the precipitable solid is removed and filtered in the artificial wetland by gravity sedimentation; the settleable and flocculateable solids are intercepted and removed through the mutual attraction between solid particles and the interception of the roots of the myriophyllum viridis; the third-level myriophyllum viridis artificial wetland decomposes suspended matters, colloids and soluble solids into inorganic matters by using the metabolic action of suspended bottom mud and bacteria parasitizing on the myriophyllum viridis, and removes nitrogen by the biological nitrification-denitrification action.
As an embodiment of the invention, the three-stage myriophyllum viridis artificial wetland comprises a first-stage myriophyllum viridis artificial wetland, a second-stage myriophyllum viridis artificial wetland and a third-stage myriophyllum viridis artificial wetland which are sequentially communicated. In the specific embodiment of the invention, the myriophyllum viridis artificial wetland is graded by utilizing natural fall, and the culture wastewater is treated by gravity flow, so that the energy consumption is greatly reduced; the three-level myriophyllum viridis artificial wetland can enhance the flow of water and improve the concentration of dissolved oxygen according to natural fall classification. In the invention, dissolved oxygen does not need to be controlled in the three-stage watermifoil ecological wetland, and the oxygen secreted by the watermifoil root system can meet the requirement of microorganisms on oxygen.
As an embodiment of the invention, the first-stage, second-stage and third-stage myriophyllum viridis artificial wetlands are independently composed of a plurality of myriophyllum viridis artificial wetland units. In a specific embodiment of the invention, the first-stage myriophyllum viridis artificial wetland consists of 6 myriophyllum viridis artificial wetland units, the second-stage myriophyllum viridis artificial wetland consists of 4 myriophyllum viridis artificial wetland units, and the third-stage myriophyllum viridis artificial wetland consists of 6 myriophyllum viridis artificial wetland units.
In the specific embodiment of the invention, the connection mode of 6 myriophyllum viridis artificial wetland units in the first-stage myriophyllum viridis artificial wetland is shown in figure 1, the connection mode is a three-row and two-column distribution mode, and the flow direction of the culture wastewater in the first-stage myriophyllum viridis artificial wetland is shown by an arrow in figure 1 and is in a zigzag flow direction. The connection mode of 4 myriophyllum viridis artificial wetland units in the second-stage myriophyllum viridis artificial wetland is shown in figure 2, the connection mode is a two-row and two-column distribution mode, and the flow direction of the culture wastewater in the second-stage myriophyllum viridis artificial wetland is shown by an arrow in figure 2; the third-stage myriophyllum viridis artificial wetland has the same structure as the first-stage myriophyllum viridis artificial wetland, and the description is omitted here.
In the invention, the areas of the first-stage myriophyllum viridis artificial wetland, the second-stage myriophyllum viridis artificial wetland and the third-stage myriophyllum viridis artificial wetland are independently preferred to be 600-1200 m2More preferably 800 to 1000m2(ii) a As the inventionIn one embodiment, the area of the first-grade myriophyllum viridis artificial wetland is 689m2The area of the second-stage myriophyllum viridis artificial wetland is 826m2The area of the third-level myriophyllum viridis artificial wetland is 1560m2. In the invention, the planting amount of the first-stage myriophyllum viridis artificial wetland, the second-stage myriophyllum viridis artificial wetland and the third-stage myriophyllum viridis artificial wetland is preferably 2-3 kg/m independently2. In the specific embodiment of the invention, when the foxtail green algae is planted for the first time, the foxtail green algae stem section with a bud head and a length of 50cm is uniformly planted in an artificial wetland unit with a natural water body with a depth of 20cm, after 15 days, the system is started, the drainage of a biological matrix treatment pool can be normally treated, meanwhile, the foxtail green algae naturally grows in the wetland unit, when plant plants grow to 1.0-1.5 m, harvesting is arranged, and the foxtail green algae with 1/3 wetland area is left during harvesting and used as seedlings to continue to grow and reproduce without planting the seedlings again; the myriophyllum viridis floats on the water surface to grow. In the specific embodiment of the invention, the water level difference is formed between the three-level myriophyllum elatinoides artificial wetlands by combining the topographic relief of the wetland construction land, so that the treatment efficiency of wastewater is improved, and particularly, the water level is sequentially reduced from the first-level myriophyllum elatinoides artificial wetland to the third-level myriophyllum elatinoides artificial wetland.
The system provided by the invention comprises an underflow percolation advanced treatment tank communicated with the water outlet of the three-stage myriophyllum green artificial wetland, and the residual pollutants are treated to obtain effluent meeting the discharge standard.
As an embodiment of the invention, the inside of the subsurface flow percolation deep treatment tank is filled with mixed filler; the mixed filler comprises a first river sand layer, a red soil layer, a second river sand layer, a zeolite layer, a third river sand layer, an activated carbon layer, a fourth river sand layer, a bentonite layer, a fifth river sand layer, a volcanic stone layer, a sixth river sand layer and a slag layer which are arranged from bottom to top in sequence; and a water inlet of the subsurface flow percolation advanced treatment tank is arranged at the bottom of the mixed filler, so that second treatment wastewater discharged by the third-level myriophyllum green artificial wetland flows through the mixed filler from bottom to top.
In bookIn the invention, the heights of the first river sand layer, the red soil layer, the second river sand layer, the zeolite layer, the third river sand layer, the activated carbon layer, the fourth river sand layer, the bentonite layer, the fifth river sand layer, the volcanic stone layer, the sixth river sand layer and the slag layer are independently preferred to be 4.5-5 cm and more preferred to be 5cm, the volume of the mixed filler is preferably 80-90% and more preferred to be 89.58% of the effective volume of the subsurface flow percolation deep treatment pool, and in a specific embodiment of the invention, when the length of ×, the width of × and the height of the subsurface flow percolation deep treatment pool are 4m × 2m × 1.2.2 m and the effective volume of the subsurface flow percolation deep treatment pool is 8.6m3When the water-cooled brick is used, the total filling amount of the first river sand layer, the second river sand layer, the third river sand layer, the fourth river sand layer, the fifth river sand layer and the sixth river sand layer is 5.4t, and the filling amount of the red soil layer, the zeolite layer, the activated carbon layer, the bentonite layer, the volcanic stone layer and the slag layer is 5.29 t; the mass ratio of the red soil layer, the zeolite layer, the activated carbon layer, the bentonite layer, the volcanic stone layer and the slag layer is preferably 5:1:1:1: 1.
In the invention, the grain sizes of the river sand in the first sand river layer, the second sand river layer, the third sand river layer, the fourth sand river layer, the fifth sand river layer and the sixth sand river layer are preferably 1-2 mm independently; the particle size of the red soil in the red soil layer is preferably 0.2-2 mm; the particle size of zeolite in the zeolite layer is preferably 2-3 mm; the particle size of the activated carbon in the activated carbon layer is preferably 3 mm; the particle size of the bentonite in the bentonite layer is preferably 0.2-2 mm; the particle size of the volcanic rock in the volcanic rock layer is preferably 5-10 mm; the grain size of the slag in the slag layer is preferably 0.5-5 mm. The invention purifies the culture wastewater by utilizing the adsorption effect of the mixed filler, and reduces the water body pollution.
The invention also provides a method for purifying the aquaculture wastewater based on the system of the technical scheme, which comprises the following steps:
conveying the culture wastewater to an aeration tank for oxygenation to obtain oxygen-containing culture wastewater;
conveying the oxygen-containing aquaculture wastewater to a front-end regulation and biological matrix treatment tank for preliminary nitrogen and phosphorus removal to obtain first treatment wastewater;
conveying the first treated wastewater to a three-level myriophyllum green artificial wetland for deep nitrogen and phosphorus removal to obtain second treated wastewater;
and conveying the second treated wastewater to a subsurface flow percolation advanced treatment tank for filtering to obtain effluent.
The invention conveys the culture wastewater to an aeration tank for oxygenation to obtain the oxygen-containing culture wastewater. In the invention, the breeding wastewater is preferably wastewater discharged from a large-scale pig farm with 2000-3000 live pigs kept in a stall, and is particularly preferably breeding wastewater discharged after solid-liquid separation and biogas digester treatment of waste in the original pig farm. In the invention, the flow rate of the aquaculture wastewater is preferably 20-30 t/d. According to one embodiment of the invention, the COD value of the aquaculture wastewater is 2000-10000 mg/L, the ammonia nitrogen content is 200-2000 mg/L, and the total phosphorus content is 20-200 mg/L.
As an embodiment of the invention, the DO value of the oxygen-containing aquaculture wastewater is 1.5-2.5, and more preferably 2.06. As an embodiment of the invention, the COD value of the oxygen-containing aquaculture wastewater is 6790-8760 mg/L, the ammonia nitrogen content is 851-1179 mg/L, and the total phosphorus content is 86.3-148.2 mg/L.
As an embodiment of the invention, before the aquaculture wastewater is conveyed to an aeration tank, the method further comprises the following steps: and conveying the aquaculture wastewater to a sedimentation tank for sedimentation treatment, and then conveying the aquaculture wastewater to an aeration tank.
After the oxygen-containing aquaculture wastewater is obtained, the oxygen-containing aquaculture wastewater is conveyed to a front-end adjusting and biological matrix treatment tank for preliminary nitrogen and phosphorus removal, so that first treatment wastewater is obtained. In the invention, the COD value of the first treated wastewater is 1637-5980 mg/L, the ammonia nitrogen content is 487-652 mg/L, and the total phosphorus content is 37.4-60.3 mg/L.
After the first treated wastewater is obtained, the first treated wastewater is conveyed to a three-level myriophyllum green artificial wetland for deep nitrogen and phosphorus removal to obtain second treated wastewater. In the specific embodiment of the invention, after the first-stage myriophyllum viridis artificial wetland treatment is carried out on the first-stage processed wastewater, the COD value in the wastewater is 645-1560 mg/L, the ammonia nitrogen content is 198-429 mg/L, and the total phosphorus content is 19.3-28.1 mg/L; after the wastewater discharged by the first Foliumet alga artificial wetland is treated by the second Foliumet alga artificial wetland, the COD value in the wastewater is 273-645 mg/L, the ammonia nitrogen content is 65.1-187.8 mg/L, and the total phosphorus content is 10.6-14.7 mg/L; after the wastewater discharged by the second Fox-ray green algae artificial wetland is treated by the third Fox-ray green algae artificial wetland, the COD value in the second treated wastewater is 146-305 mg/L, the ammonia nitrogen content is 22.6-82.2 mg/L, and the total phosphorus content is 7.9-10.5 mg/L.
After the second treated wastewater is obtained, the second treated wastewater is conveyed to the undercurrent percolation deep treatment pool for filtration to obtain effluent. In the invention, the COD value of the effluent is 66-97 mg/L, the ammonia nitrogen content is 8.3-10.6 mg/L, and the total phosphorus content is 3.6-6.5 mg/L. The effluent obtained after purification meets the standards of COD <150mg/L, ammonia nitrogen <30mg/L and total phosphorus <6 mg/L.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Taking a Luo black pig farm (5000 pigs in stock) of Tianfu agriculture Limited liability company located in Jinjing town of Changsha county, Hunan province as a demonstration base (10 km away from Changsha agricultural environment station), purifying cultivation wastewater discharged after solid-liquid separation and biogas digester treatment of the original farm waste according to the process flow shown in figure 3 on the basis of the original cultivation waste solid-liquid separation and biogas engineering:
the culture wastewater is precipitated by a sedimentation tank and then is conveyed to an aeration tank (30 m)2) Carrying out oxygenation to obtain oxygen-containing aquaculture wastewater with DO value of 2.06; the flow rate of the aquaculture wastewater is 31.25L/min; a PVC porous pipe is laid at the bottom of the aeration tank, the aperture of the PVC porous pipe is 4mm, the hole pitch is 20cm, and an aeration fan is used for filling oxygen into the PVC porous pipe;
transporting the oxygen-containing aquaculture wastewater to a front endConditioning and biological substrate treatment tank (456 m)2) Carrying out preliminary nitrogen and phosphorus removal to obtain first treated wastewater; the front-end adjusting and biological matrix treating pool is filled with 10t of straws, and the straws are added once every 6 months;
conveying the first treated wastewater to a third-stage myriophyllum viridis artificial wetland (a first-stage myriophyllum viridis artificial wetland 689 m)2Second-stage myriophyllum viridis constructed wetland 826m21560m of third-level myriophyllum viridis artificial wetland2) Carrying out deep denitrification and dephosphorization to obtain second treated wastewater;
conveying the second treated wastewater to a subsurface flow filtration deep treatment pool (the length, the width and the height are 6m 2m 1.3m), and filtering to obtain effluent; the inside of the subsurface flow percolation deep treatment pool is filled with a first river sand layer of 5cm, a red soil layer of 5cm, a second river sand layer of 5cm, a zeolite layer of 5cm, a third river sand layer of 5cm, an active carbon layer of 5cm, a fourth river sand layer of 5cm, a bentonite layer of 5cm, a fifth river sand layer of 5cm, a volcanic stone layer of 5cm, a sixth river sand layer of 5cm and a slag layer of 5cm from bottom to top; a water inlet of the subsurface flow percolation deep treatment tank is arranged at the bottom of the mixed filler, so that second treatment wastewater discharged by the third-level myriophyllum green artificial wetland flows through the mixed filler from bottom to top; the mass ratio of the red soil layer to the zeolite layer to the activated carbon layer to the bentonite layer to the volcanic stone layer to the slag layer is 5:1:1:1: 1; the total filling amount of the first river sand layer, the second river sand layer, the third river sand layer, the fourth river sand layer, the fifth river sand layer and the sixth river sand layer is 5.4t, and the filling amount of the red soil layer, the zeolite layer, the activated carbon layer, the bentonite layer, the volcanic stone layer and the slag layer is 5.29 t; the average grain diameter of the river sand in the first sand river layer, the second sand river layer, the third sand river layer, the fourth sand river layer, the fifth sand river layer and the sixth sand river layer is 1.6 mm; the average grain diameter of the red soil in the red soil layer is 0.8 mm; the average grain diameter of zeolite in the zeolite layer is 2.4 mm; the particle size of the activated carbon in the activated carbon layer is 3 mm; the average grain diameter of the bentonite in the bentonite layer is 0.9 mm; the average particle size of the volcanic rocks in the volcanic stone layer is 7.1 mm; the average grain diameter of the slag in the slag layer is 1.8 mm.
In the embodiment, the COD value of the aquaculture wastewater is 7730.6mg/L, the ammonia nitrogen content is 988.1mg/L, and the total phosphorus content is 122.3 mg/L; the processing conditions of each process section are shown in tables 1-3 after 8 times of regular sampling analysis between 11 months in 2018 and 10 months in 2019:
TABLE 1 COD monitoring results (mg/L)
TABLE 2 Ammonia nitrogen monitoring results (mg/L)
TABLE 3 Total phosphorus monitoring results (mg/L)
As can be seen from tables 1-3, the average COD value of the effluent treated by the system provided by the invention is 80.5mg/L, the average content of ammonia nitrogen is 9.4mg/L, the average content of total phosphorus is 5.3mg/L, and the effluent meets the standards of COD <150mg/L, ammonia nitrogen <30mg/L and total phosphorus <6 mg/L; the average removal rate of COD is 98.9%, the removal rate of ammonia nitrogen is 99.0%, and the removal rate of total phosphorus is 95.7%, which shows that the system provided by the invention can efficiently remove COD, ammonia nitrogen and total phosphorus in the culture wastewater; the system provided by the invention can still reach the discharge standard after continuously operating for 12 months, which shows that the system provided by the invention has excellent impact resistance and good stability. In addition, the system provided by the invention has the advantages of simple structure, low operation and maintenance cost and better application prospect.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. A system for purifying aquaculture wastewater is characterized by comprising an aeration tank, a front end adjusting and biological matrix treatment tank, a three-level myriophyllum viridis constructed wetland and an underflow percolation advanced treatment tank which are sequentially communicated.
2. The system of claim 1, wherein the front end conditioning and bio-substrate treatment basin is filled with straw.
3. The system according to claim 1, wherein the three-stage myriophyllum chlorophyllin artificial wetland comprises a first stage myriophyllum chlorophyllin artificial wetland, a second stage myriophyllum chlorophyllin artificial wetland and a third stage myriophyllum chlorophyllin artificial wetland which are sequentially communicated; the areas of the first-stage myriophyllum viridis artificial wetland, the second-stage myriophyllum viridis artificial wetland and the third-stage myriophyllum viridis artificial wetland are 600-1200 m independently2(ii) a The planting amount of the first-stage myriophyllum viridis artificial wetland, the second-stage myriophyllum viridis artificial wetland and the third-stage myriophyllum viridis artificial wetland is independently 2-3 kg/m2。
4. The system of claim 1, wherein the interior of the subsurface flow diafiltration polisher is filled with a mixed packing; the mixed filler comprises a first river sand layer, a red soil layer, a second river sand layer, a zeolite layer, a third river sand layer, an activated carbon layer, a fourth river sand layer, a bentonite layer, a fifth river sand layer, a volcanic stone layer, a sixth river sand layer and a slag layer which are arranged from bottom to top in sequence; and the water inlet of the subsurface flow percolation deep treatment tank is arranged at the bottom of the mixed filler.
5. The system of claim 4, wherein the first river sand layer, the red soil layer, the second river sand layer, the zeolite layer, the third river sand layer, the activated carbon layer, the fourth river sand layer, the bentonite layer, the fifth river sand layer, the volcanic stone layer, the sixth river sand layer and the slag layer have a height of 4.5-5 cm independently; and the volume of the mixed filler accounts for 80-90% of the volume of the subsurface flow percolation deep treatment pool.
6. The system according to claim 4 or 5, wherein the grain size of the river sand in the first, second, third, fourth, fifth and sixth sand layers is independently 1-2 mm; the particle size of the red soil in the red soil layer is 0.2-2 mm; the particle size of zeolite in the zeolite layer is 2-3 mm; the particle size of the activated carbon in the activated carbon layer is 3 mm; the particle size of the bentonite in the bentonite layer is 0.2-2 mm; the particle size of the volcanic rock in the volcanic rock layer is 5-10 mm; the grain size of the furnace slag in the furnace slag layer is 0.5-5 mm.
7. The system of claim 1, further comprising a settling tank, wherein the water inlet of the settling tank is a breeding wastewater inlet; the water outlet of the sedimentation tank is communicated with the water inlet of the aeration tank.
8. A method for purifying aquaculture wastewater based on the system of any one of claims 1 to 6, comprising the following steps:
conveying the culture wastewater to an aeration tank for oxygenation to obtain oxygen-containing culture wastewater;
conveying the oxygen-containing aquaculture wastewater to a front-end regulation and biological matrix treatment tank for preliminary nitrogen and phosphorus removal to obtain first treatment wastewater;
conveying the first treated wastewater to a three-level myriophyllum green artificial wetland for deep nitrogen and phosphorus removal to obtain second treated wastewater;
and conveying the second treated wastewater to a subsurface flow percolation advanced treatment tank for filtering to obtain effluent.
9. A method for purifying aquaculture wastewater based on the system of claim 7, comprising the steps of:
conveying the aquaculture wastewater to a sedimentation tank for sedimentation treatment, and then conveying the aquaculture wastewater to an aeration tank for oxygenation to obtain oxygen-containing aquaculture wastewater;
conveying the oxygen-containing aquaculture wastewater to a front-end regulation and biological matrix treatment tank for preliminary nitrogen and phosphorus removal to obtain first treatment wastewater;
conveying the first treated wastewater to a three-level myriophyllum green artificial wetland for deep nitrogen and phosphorus removal to obtain second treated wastewater;
and conveying the second treated wastewater to a subsurface flow percolation advanced treatment tank for filtering to obtain effluent.
10. The method according to claim 8 or 9, wherein the breeding wastewater is wastewater discharged from a large-scale pig farm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010429386.3A CN111762959A (en) | 2020-05-20 | 2020-05-20 | System and method for purifying aquaculture wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010429386.3A CN111762959A (en) | 2020-05-20 | 2020-05-20 | System and method for purifying aquaculture wastewater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111762959A true CN111762959A (en) | 2020-10-13 |
Family
ID=72719205
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010429386.3A Pending CN111762959A (en) | 2020-05-20 | 2020-05-20 | System and method for purifying aquaculture wastewater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111762959A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2032239A (en) * | 2021-07-21 | 2023-01-26 | Hunan Airbluer Env Prot Tech Co Ltd | Sewage treatment system based on myriophyllum elatinoides gaudich biological oxidation pond and method thereof |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101239752A (en) * | 2007-08-27 | 2008-08-13 | 北京能拓高科技有限公司 | Low concentration domestic sewage treatment system combined with landscape |
| CN102120677A (en) * | 2011-01-26 | 2011-07-13 | 天津市水利科学研究院 | Biological response system for multistage sewage treatment as well as manufacturing method and sewage treatment method |
| CN202011816U (en) * | 2011-03-14 | 2011-10-19 | 上海市政工程设计研究总院（集团）有限公司 | Reinforced treatment device for combination of high-organic matters and metal micro-polluted raw water |
| CN103359882A (en) * | 2013-07-24 | 2013-10-23 | 中国科学院亚热带农业生态研究所 | Method for treating pig farm waste pollutant |
| CN103359825A (en) * | 2013-07-24 | 2013-10-23 | 中国科学院亚热带农业生态研究所 | Method for treating pig farm wastewater by using straw |
| CN103359881A (en) * | 2013-07-24 | 2013-10-23 | 中国科学院亚热带农业生态研究所 | Method for reducing and controlling wastewater pollution of pig farm |
| CN104129857A (en) * | 2014-07-29 | 2014-11-05 | 青海省环境科学研究设计院 | High-cold region reclaimed water deep-purification constructed wetland system |
| CN205367901U (en) * | 2016-01-12 | 2016-07-06 | 沈勤 | Beasts, birds and aquatic products straw matrix pond of dissolving |
| CN105753166A (en) * | 2016-04-27 | 2016-07-13 | 北京伊普国际水务有限公司 | Horizontal subsurface flow-two-level oxygenating vertical subsurface flow constructed wetland sewage treatment system and method |
| CN106396295A (en) * | 2016-12-06 | 2017-02-15 | 广西壮族自治区农业科学院农业资源与环境研究所 | Device for treating pig raising wastewater by using myriophyllum spicatum |
| CN107572725A (en) * | 2017-09-30 | 2018-01-12 | 中国科学院亚热带农业生态研究所 | A kind of pig farm breeding wastewater ecological treatment method and system |
| CN109052645A (en) * | 2018-10-20 | 2018-12-21 | 湖南艾布鲁环保科技股份有限公司 | A kind of sewage disposal system and method based on green fox-brush algae bio-oxidation pond |
| CN110127953A (en) * | 2019-06-05 | 2019-08-16 | 北京市水科学技术研究院 | A kind of artificial swamp short distance nitration/denitrification biological denitrogenation system and method |
| CN209668893U (en) * | 2019-01-14 | 2019-11-22 | 重庆文理学院 | Embedded bypass oxygenation constructed wetland system for sewage treatment |
| CN110950496A (en) * | 2019-12-12 | 2020-04-03 | 福建省农业科学院农业工程技术研究所 | Pig farm excrement aerobic treatment device and working method thereof |
| CN111056700A (en) * | 2019-12-05 | 2020-04-24 | 上海市建工设计研究总院有限公司 | Novel composite wetland system for repairing micro-polluted water body |
-
2020
- 2020-05-20 CN CN202010429386.3A patent/CN111762959A/en active Pending
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101239752A (en) * | 2007-08-27 | 2008-08-13 | 北京能拓高科技有限公司 | Low concentration domestic sewage treatment system combined with landscape |
| CN102120677A (en) * | 2011-01-26 | 2011-07-13 | 天津市水利科学研究院 | Biological response system for multistage sewage treatment as well as manufacturing method and sewage treatment method |
| CN202011816U (en) * | 2011-03-14 | 2011-10-19 | 上海市政工程设计研究总院（集团）有限公司 | Reinforced treatment device for combination of high-organic matters and metal micro-polluted raw water |
| CN103359882A (en) * | 2013-07-24 | 2013-10-23 | 中国科学院亚热带农业生态研究所 | Method for treating pig farm waste pollutant |
| CN103359825A (en) * | 2013-07-24 | 2013-10-23 | 中国科学院亚热带农业生态研究所 | Method for treating pig farm wastewater by using straw |
| CN103359881A (en) * | 2013-07-24 | 2013-10-23 | 中国科学院亚热带农业生态研究所 | Method for reducing and controlling wastewater pollution of pig farm |
| CN104129857A (en) * | 2014-07-29 | 2014-11-05 | 青海省环境科学研究设计院 | High-cold region reclaimed water deep-purification constructed wetland system |
| CN205367901U (en) * | 2016-01-12 | 2016-07-06 | 沈勤 | Beasts, birds and aquatic products straw matrix pond of dissolving |
| CN105753166A (en) * | 2016-04-27 | 2016-07-13 | 北京伊普国际水务有限公司 | Horizontal subsurface flow-two-level oxygenating vertical subsurface flow constructed wetland sewage treatment system and method |
| CN106396295A (en) * | 2016-12-06 | 2017-02-15 | 广西壮族自治区农业科学院农业资源与环境研究所 | Device for treating pig raising wastewater by using myriophyllum spicatum |
| CN107572725A (en) * | 2017-09-30 | 2018-01-12 | 中国科学院亚热带农业生态研究所 | A kind of pig farm breeding wastewater ecological treatment method and system |
| CN109052645A (en) * | 2018-10-20 | 2018-12-21 | 湖南艾布鲁环保科技股份有限公司 | A kind of sewage disposal system and method based on green fox-brush algae bio-oxidation pond |
| CN209668893U (en) * | 2019-01-14 | 2019-11-22 | 重庆文理学院 | Embedded bypass oxygenation constructed wetland system for sewage treatment |
| CN110127953A (en) * | 2019-06-05 | 2019-08-16 | 北京市水科学技术研究院 | A kind of artificial swamp short distance nitration/denitrification biological denitrogenation system and method |
| CN111056700A (en) * | 2019-12-05 | 2020-04-24 | 上海市建工设计研究总院有限公司 | Novel composite wetland system for repairing micro-polluted water body |
| CN110950496A (en) * | 2019-12-12 | 2020-04-03 | 福建省农业科学院农业工程技术研究所 | Pig farm excrement aerobic treatment device and working method thereof |
Non-Patent Citations (5)
| Title |
|---|
| SININGZHOU等: "Enhancing nitrogen removal from anaerobically-digested swine wastewater through integration of Myriophyllum aquaticum and free nitrous acid-based technology in a constructed wetland", 《SCIENCE OF THE TOTAL ENVIRONMENT》 * |
| 刘铭羽等: "3种基质材料对高浓度养殖废水处理效果及降解过程", 《环境科学》 * |
| 姚燃等: "三级绿狐尾藻表面流人工湿地对养殖废水处理效应研究", 《地球与环境》 * |
| 李远航等: "稻草―绿狐尾藻复合人工湿地技术处理养猪废水综合效益分析", 《农业现代化研究》 * |
| 蒋磊等: "曝气对生物基质技术处理养殖废水脱氮除磷效果的影响特征及机理", 《水处理技术》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL2032239A (en) * | 2021-07-21 | 2023-01-26 | Hunan Airbluer Env Prot Tech Co Ltd | Sewage treatment system based on myriophyllum elatinoides gaudich biological oxidation pond and method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105906150A (en) | Sewage treatment system and technology for river ways in city | |
| CN212770335U (en) | Ecological management system of tail water breeds | |
| CN110217890B (en) | Device and method for enhancing water body nitrogen removal based on aerobic denitrification fungi | |
| CN102583752B (en) | Device and method for purifying river/lake water pollution | |
| CN108675464A (en) | A method of micro heavy and trace F-53B in removal electroplating wastewater processing water outlet | |
| CN105016579A (en) | Rural sewage treatment system | |
| CN109399798A (en) | A kind of precipitating algae pond-helotisn ecology board slot-microorganism filter tank water treatment system and processing method | |
| CN114751594A (en) | Composite carbon-based reinforced modular baffling biological infiltration system and method thereof | |
| CN100384763C (en) | Artificial ecological waste water treating device | |
| CN109095728A (en) | A kind of rainfall runoff purification device and purification method | |
| CN111762959A (en) | System and method for purifying aquaculture wastewater | |
| CN2898004Y (en) | Assembled artificial ecological waste-water treater | |
| CN109879536B (en) | Rural domestic sewage purification system and purification method | |
| CN111847778A (en) | Method for treating and maintaining landscape water body and pool | |
| CN208200655U (en) | A kind of breeding wastewater ecological management system | |
| CN112851037B (en) | Lawn capable of intercepting and purifying particles in water in multiple stages | |
| CN212356921U (en) | Decentralized rural sewage treatment device | |
| CN204981491U (en) | Rural sewage treatment plant | |
| CN211078811U (en) | Rural domestic sewage's processing system | |
| CN211339184U (en) | Domestic sewage integrated treatment equipment based on steel slag ceramsite filler biological filter | |
| CN107529524A (en) | A kind for the treatment of method for rural sewage and system | |
| CN210457826U (en) | Four-stage coupling water treatment ecological system | |
| CN210030315U (en) | Aquaculture sewage treatment equipment | |
| CN103553185B (en) | A kind of micro-electrolysis treatment method that water body is carried out in-situ treatment | |
| CN207552136U (en) | A kind of livestock breeding wastewater processing system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201013 |
|
| RJ01 | Rejection of invention patent application after publication |