A kind of industrialized aquiculture tail water efficient denitrification deviceTechnical field
The present invention relates to aquaculture tail water processing technology field is and in particular to a kind of industrialized aquiculture tail water is efficientNitrogen rejection facility is it is adaptable to batch production processes on a large scale and reclaims aquaculture tail water.
Background technology
China is an aquaculture big country, is the important supply ground of world's aquatic products, but traditional extensive fisheryThe mode of production has been faced with the restriction of the many factors such as resource, environment.Meanwhile, with the raising of people's quality of the life, name is specialExcellent Fish (as sturgeon, salmon, trout, cabrilla etc.) progress into consumption market, traditional extensive production mode can not meetThe cultivation demand of these Fish.It is one that exploitation has the controlled industrial circulating water cultivating of water saving, province ground, environmental friendliness, conditionThe important outlet of bar.
Industrial circulating water cultivating is as improving and growing up of science and technology, and it is on the basis of high-density breedingOn, manual or automatic control is carried out to each factors such as the water quality during producing, water temperature, bait, epidemic prevention, filth disposal or linkSystem, makes breed variety reach a kind of mode of production of the fastest speed of production as far as possible.This cyclic culture mode has and is not subject to groundDomain, weather conditions limit, have water saving, save land, per unit area yield height, environmental protection many advantages, such as, be realize fish quality newApproach, has become the important development direction of aquatic product fishery.
Industrial circulating water cultivating system generally includes culturing area and water process region two parts.In culturing area,Lower floor's breeding water body dissolved oxygen content is low, and normal deposition has the solid particulate matters such as fish excrement residual bait it is therefore desirable to extract water processRegion carries out purification of water quality process, more sterilized oxygenation, is finally back to culturing area, reaches the purpose of water circulation utilization.At this stage, industrial circulating water cultivating system common configuration, in the good large-scale workshop of construction specification, light-proofness, can reach water bodyThe purpose of circulation, but this industrial circulating water cultivating system has a following clearly disadvantageous part:
First, low to the utilization rate of the natural energy sources such as light, wind.
2nd, the equipment of water treatment portion is huge, high energy consumption, complex operation, investment and operating cost is big, water quality stabilityWeak.
3rd, lack the effective interception to solid particulate matter during water body purification, and protein, aminoacid, polysaccharideEffective decomposition, lead to solid particulate matter in breeding water body, the dissolved larger molecular organicses content can not to be in any more, oxygen consumption is serious.Meanwhile, not high to all kinds of carbon source overall availabilities of enrichment in detached solid particulate matter and water body.Water purification in breeding processThe direct discharge of the routine cleaning of facility and high concentration bottom sewage all exacerbate arround carrying capacity of environment, breeding water body is overallCyclic utilization rate is not high, and water-saving and emission-reducing effect is undesirable.
4th, existing water treatment facilities, in terms of regulating and controlling water quality, are difficult to take into account to high while ammonia nitrogen, nitrate nitrogen or nitrite nitrogenEffect removes, and the removal efficiency therefore also resulting in total nitrogen is not high.And the accumulation of ammonia nitrogen, nitrate nitrogen or nitrite nitrogen is batch production at this stageIt is easiest to the difficult problem occurring in circulating water culture system.How to reduce or control oxygen consumption in industrial circulating water cultivating system hasThe content of the harmful substances such as machine thing, ammonia nitrogen, nitrite nitrogen is the key successfully regulating and controlling water quality.
Artificial swamp is a kind of effective sewage disposal technology developed in recent years, small investment, easy care, clean-up effectGood, applied widely, existing certain application in culture fishery at present.Research shows both at home and abroad, either single or groupClose type, artificial swamp is unsatisfactory to the removal effect of low stain aquaculture tail water nitrogen pollutant, trace it to its cause mainBe attributed to following some:
One be microorganism nitrification/Denitrification be still artificial swamp denitrogenation main path.General aquaculture tailWater dissolution oxygen content is not high, adds the low dissolved oxygen environments within current wetland, and the Nitrification of ammonia nitrogen is significantly limited, leads toWater ammonia nitrogen is higher than water inlet on the contrary.
Two was aquaculture tail water before entering artificial swamp all through certain precipitation process, and the carbon source in water body is manyHalf is deposited on sedimentation tank bottom and (or) artificial swamp surface with particulate form, and the dissolved can nitrify using carbon source is most ofIt is degraded during reaction.Due to a lack of dissolved oxygen, the mineralization of organic material effect being deposited on artificial swamp surface is faint, and artificial swampThe carbon source of the growth of plant and decay process release seldom, leads to Denitrification carbon source not enough.
Three is compared with industrial wastewater, and aquaculture tail water has the features such as pollutant levels are low, discharge capacity is big.With artificialWetland carries out processing and often assumes high water-base fluid, short residence time phenomenon.And nitrification/the denitrification of microorganism is not only controlled byRedox Condition, also closely related with hydraulic detention time, it is several that the prolongation time of staying can increase nitrification/denitrifying effectRate.
Content of the invention
In order to solve the problems, such as above-mentioned prior art, the invention provides a kind of industrialized aquiculture tail water is efficientNitrogen rejection facility, this apparatus structure is simple, energy consumption is low, simple to operate, investment and operating cost are few, and can efficient removal water simultaneouslyProduce the Organic substance cultivating in tail water, ammonia nitrogen, nitrate nitrogen and nitrite nitrogen etc., realize recycling of aquaculture tail water.
Realizing the technical scheme that above-mentioned purpose of the present invention adopted is:
A kind of industrialized aquiculture tail water efficient denitrification device, at least include anaerobic fixed film reactor, sedimentation tank, Microfilter,Aeration vertical subsurface flow wetland, deflector type horizontal subsurface flow wetland, ultraviolet sterilizer and water storage oxygenation pond, Microfilter is installed on cultivationAt the discharge outlet in fishpond, the position of Microfilter water inlet is less than the position of the discharge outlet of cultivation fish pond, the water inlet of Microfilter withThe discharge outlet connection of cultivation fish pond, the discharge outlet of Microfilter is connected with the water inlet of anaerobic fixed film reactor, anaerobic fixed film reactor topDischarge outlet is connected with the water inlet of sedimentation tank；
Described aeration vertical subsurface flow wetland is the pond of brick mix structure, aeration vertical subsurface flow wetland side wall relative positionIt is provided with water inlet and discharge outlet, the water inlet of aeration vertical subsurface flow wetland is located at the top of aeration vertical subsurface flow wetland side wall, exposeThe discharge outlet of gas vertical subsurface flow wetland is located at the bottom of aeration vertical subsurface flow wetland side wall, and the inside of aeration vertical subsurface flow wetland is filled outIt is filled with the stronger substrate of absorbability, aeration vertical subsurface flow wetland top is provided with the t type water inlet supervisor of horizontal positioned, water inlet supervisorIncluding water inlet pipe a and water inlet pipe b, water inlet pipe a is connected with the middle part of water inlet pipe b, and water inlet pipe a passes through aeration verticalThe water inlet of current wetland, the top of aeration vertical subsurface flow wetland is provided with the water distributor that a row equidistantly arranges, each water distributorOne end connect with water inlet pipe b and perpendicular to water inlet pipe b, the other end is closed, and the bottom of water distributor is connect with the top of substrateTouch, the bottom of water distributor is provided with the osculum of more than two rows, and the bottom of aeration vertical subsurface flow wetland is provided with a row and equidistantly arrangesCollector pipe, the part that collector pipe is contacted with substrate is provided with the inlet opening of more than three rows, aeration vertical subsurface flow wetland bottom oneSide is provided with the drain header of horizontal positioned, and water inlet supervisor includes branch drain a and branch drain b, branch drain a and branch drainThe middle part connection of b, branch drain b passes through the discharge outlet of aeration vertical subsurface flow wetland parallel to water inlet pipe b, branch drain a, exposesIt is provided with, near aeration vertical subsurface flow wetland side-walls, the vertical tube that a row equidistantly arranges, vertically places in gas vertical subsurface flow wetland,Vertical tube is higher than stromal surface and end sealing, and one end of each collector pipe is connected with branch drain b and perpendicular to branch drain b,Other end vertical tube corresponding with this drain pipe connects, and is interspersed with plastic flexible pipe, is provided with nanometer micro- in each collector pipe in each vertical tubeHole aeration tube, the periphery of aeration vertical subsurface flow wetland is provided with dissolved oxygen measurement and control host computer and aerator, and the air outlet of aerator setsIt is connected with total air supply pipe, one end of each plastic flexible pipe is connected with total air supply pipe, the other end is corresponding with this plastic flexible pipe to be receivedRice micropore aeration pipe connection, drain header is provided with dissolved oxygen observing and controlling sensing with the junction of aeration vertical subsurface flow wetland discharge outletDevice, dissolved oxygen observing and controlling sensor is connected with dissolved oxygen measurement and control host computer, and dissolved oxygen measurement and control host computer is connected with aerator；
Described deflector type horizontal subsurface flow wetland is the pond of brick mix structure, and deflector type horizontal subsurface flow wetland is provided with water inletAnd outlet, it is provided with parallel staggered deflected current wall in deflector type horizontal subsurface flow wetland, be filled with deflector type horizontal subsurface flow wetlandThe stronger substrate of absorbability；
The water outlet at sedimentation tank top is provided with flow divider, and the outlet of sedimentation tank is vertical with aeration respectively by flow dividerThe water inlet pipe a of current wetland connects with the water inlet of deflector type horizontal subsurface flow wetland, and the draining of aeration vertical subsurface flow wetland is propped upPipe a is also connected with the water inlet of deflector type horizontal subsurface flow wetland, and water storage oxygenation pond is provided with water inlet and outlet, deflector type levelThe outlet of current wetland is connected with the water inlet of ultraviolet sterilizer, the outlet of ultraviolet sterilizer and water storage oxygenation pondWater inlet connects, and water storage oxygenation pond is provided with microporous aeration disc.
The bottom casting concrete base plate of aeration vertical subsurface flow wetland, concrete floor tilts, the inclination of concrete floorFace is 3 ‰～10 ‰ with the angle of aeration vertical subsurface flow wetland bottom surface, and concrete floor enters near aeration vertical subsurface flow wetlandThe side at the mouth of a river is higher than the outlet side near aeration vertical subsurface flow wetland, each water distributor inclination, each water distributor and horizontal planeAngle be 3 ‰～10 ‰, one end that each water distributor is connected with water inlet pipe b be higher than closing the other end, deflector type level diveStream wetland bottom surface is 3 ‰～10 ‰ with the angle of horizontal plane, and deflector type horizontal subsurface flow wetland bottom surface is near the side of its water inletHigher than the side near its outlet.
It is filled with the substrate of three layers of different-grain diameter, the particle diameter of three layers of substrate is from the bottom up successively in aeration vertical subsurface flow wetlandReduce.
Branch drain a is provided with the evacuated tube connecting with branch drain a, and evacuated tube is located at top and the position of branch drain aOutside aeration vertical subsurface flow wetland, evacuated tube is provided with equidistant outlet valve, for regulating and controlling idle periods wetland water level inside, preventsThe only withered death of wetland plant.
The bottom of anaerobic fixed film reactor and sedimentation tank is equipped with sewage sump, and the bottom surface of sedimentation tank is higher than the bottom of anaerobic fixed film reactorFace, the bottom of sedimentation tank is connected with anaerobic fixed film reactor by tilted tube, and the bottom of anaerobic fixed film reactor is provided with sludge pump, anaerobismHydrolytic tank is connected with the water inlet of Microfilter by sludge pump.
In aeration vertical subsurface flow wetland, plantation has vascular plant, and described vascular plant is phragmites communiss or Arundo donax.
In deflector type horizontal subsurface flow wetland, plantation has shallow root hygrophyte, and described shallow root hygrophyte is Canna generalis Bailey or lampHeart grass.
Described substrate is porous ceramic grain.
Compared with prior art, its advantage is the present invention with advantage:
1st, this device is with the suspended solid in industrialized aquiculture tail water, oxygen consumption organic, ammonia nitrogen, nitrate nitrogen and nitrite nitrogenDeng removal be core, according to current wetland process low stain water body main Approach of Removal of Nitrogen nitrification/denitrification, by aerationThe denitrification function of the strong nitrification function of vertical subsurface flow wetland and horizontal subsurface flow wetland organically combines, and successfully solves ammonia nitrogen, nitreEfficiently remove problem while nitrogen or nitrite nitrogen, nitric efficiency is greatly improved.
2nd, be additionally arranged before this device is processing stage aeration vertical subsurface flow wetland and deflector type horizontal subsurface flow wetland Microfilter,The facilities such as anaerobic fixed film reactor, sedimentation tank, both ensure that solid-liquid separation, significantly reduced the solid particulate matter water in cultivation tail waterFlat, reduce the risk that aeration vertical subsurface flow wetland and deflector type horizontal subsurface flow wetland are blocked with solid particulate matter over loading,Again the remaining Organic substance filtering through Microfilter, macromole hardly degraded organic substance successful hydrolysis are become small-molecule substance, for follow-upThe denitrification process of deflector type horizontal subsurface flow wetland provides available carbon source.
3rd, this device is nitrification, the totally different nitrogen degradation process of this two nutrition of denitrification, dissolved oxygen requirement strengthens respectivelyCondition needed for each autoreaction.Absorbability is filled by bottom aeration, bottom water outlet, plantation vascular plant, grade separationStronger substrate, expand the measures such as substrate depth of cracking closure, configuration dissolved oxygen measure and control device and ensure the strong of aeration vertical subsurface flow wetlandNitrification, configuration dissolved oxygen measure and control device can also run for energy saving of system and provide safeguard；By building deflector type horizontal drowned flowWetland, extends sewage flow process, the stronger substrate of filling absorbability, increases the time of contact of dirt and substrate, plantation shallow root is wetPlant is it is ensured that hydraulic detention time, and then ensures fully carrying out of Denitrification.
4th, this device fully utilizes the organic carbon source in cultivation tail water while denitrogenation, has rationally disposed simultaneously and has separatedSolid particulate matter out, effectively achieves cultivation tail water and recycles the purpose recycling with solid waste resource recovery；The no any tail water of system external and solid waste discharge, expand water circulation and utilize dynamics, greatly improve water saving, reduce dischargingEffect, has saved water resource, protects environment.
Brief description
The overall structure diagram of the industrialized aquiculture tail water efficient denitrification device that Fig. 1 provides for the present invention.
The knot of aeration vertical subsurface flow wetland in the industrialized aquiculture tail water efficient denitrification device that Fig. 2 provides for the present inventionStructure schematic diagram.
In the industrialized aquiculture tail water efficient denitrification device that Fig. 3 provides for the present invention, aeration vertical subsurface flow wetland entersDrain pipe layout.
Deflector type horizontal subsurface flow wetland in the industrialized aquiculture tail water efficient denitrification device that Fig. 4 provides for the present inventionStructural representation.
Fig. 5 is the top view of Fig. 4.
1-Microfilter, 2-anaerobic fixed film reactor, 3-sedimentation tank, 4-aeration vertical subsurface flow wetland, 5-deflector type level are divedStream wetland, 6-ultraviolet sterilizer, 7-water storage oxygenation pond, 8-substrate, 9-water inlet supervisor (include water inlet pipe a (9a) andWater inlet pipe b (9b)), 10-water distributor, 11-collector pipe, 12-drain header (include branch drain a (12a) and draining prop upPipe b (12b)), 13-vertical tube, 14-plastic flexible pipe, 15-nanometer micropore aeration tube, 16-dissolved oxygen measurement and control host computer, 17-drumBlower fan, 18-total air supply pipe, 19-dissolved oxygen observing and controlling sensor, 20-deflected current wall, 21-flow divider, 22-concrete floor,23-evacuated tube, 24-outlet valve, 25-vascular plant, 26-shallow root hygrophyte.
Specific embodiment
Below in conjunction with the accompanying drawings the present invention is specifically described.
The structure of the industrialized aquiculture tail water efficient denitrification device that the present invention provides is as shown in figure 1, at least include micro-Filter 1, anaerobic fixed film reactor 2, sedimentation tank 3, aeration vertical subsurface flow wetland 4, deflector type horizontal subsurface flow wetland 5, ultraviolet sterilizer 6With water storage oxygenation pond 7.The water inlet of Microfilter 1 is connected with the discharge outlet of cultivation fish pond, and the water inlet position of Microfilter 1 is less than supportsGrow the discharge outlet position in fishpond, being so easy to water can voluntarily flow into.The discharge outlet of Microfilter 1 and the water inlet of anaerobic fixed film reactor 2Connection, the discharge outlet at anaerobic fixed film reactor 2 top is connected with the water inlet of sedimentation tank 3 bottom.Anaerobic fixed film reactor 2 and sedimentation tank 3Bottom is equipped with sewage sump, and the bottom surface of sedimentation tank 3 is higher than the bottom surface of anaerobic fixed film reactor 2, and tilted tube is passed through in the bottom of sedimentation tank 3Connect with anaerobic fixed film reactor 2, be easy to be precipitated in the mud entrance anaerobic fixed film reactor of sedimentation tank bottom.Anaerobic fixed film reactor 2Bottom is provided with sludge pump, and anaerobic fixed film reactor 2 is connected with the water inlet of Microfilter 1 by sludge pump, periodically by anaerobic fixed film reactor 2The sludge lifting of middle accumulation is filtered to Microfilter 1.In the present embodiment, Microfilter 2 is box rotary drum Microfilter, filtering accuracy30～130 μm, flow 30～120m3/h.Anaerobic fixed film reactor 2, sedimentation tank 3 are arranged at underground, and wherein anaerobic fixed film reactor 2 is groundBuried pond.The size of anaerobic fixed film reactor 2 is that 8m length × 4m width × 4m is deep, and the size of sedimentation tank 3 is that 5m length × 4m width × 3m is deep,The hydraulic detention time of anaerobic fixed film reactor 2 and sedimentation tank 3 is respectively 6.4h and 3.0h.
Described aeration vertical subsurface flow wetland 4 is the pond of brick mix structure, as shown in Figure 2.Aeration vertical subsurface flow wetland 4 sideWall relative position is provided with water inlet and discharge outlet, and the water inlet of aeration vertical subsurface flow wetland 4 is located at aeration vertical subsurface flow wetland 4The top of side wall, the discharge outlet of aeration vertical subsurface flow wetland 4 is located at the bottom of aeration vertical subsurface flow wetland 4 side wall.Aeration is verticalThe bottom of current wetland 4 adopts concreting concrete floor, and concrete floor 22 tilts, the inclined plane of concrete floor 22Angle with aeration vertical subsurface flow wetland 4 bottom surface is 3 ‰～10 ‰, and concrete floor 22 is near aeration vertical subsurface flow wetland 4The side of water inlet is higher than it near the outlet side of aeration vertical subsurface flow wetland 4.The inside of aeration vertical subsurface flow wetland 4 is filled outIt is filled with the stronger substrate of absorbability 8, substrate 8 depth of cracking closure is higher than conventional depth (generally 0.6～1.0m), be easy to increase waterThe time of gas contact and flow process.
Aeration vertical subsurface flow wetland 4 top is provided with the t type water inlet supervisor 9 of horizontal positioned, and water inlet supervisor 9 includes water inlet pipeA 9a and water inlet pipe b 9b, water inlet pipe a 9a are connected with the middle part of water inlet pipe b 9b, and water inlet pipe a 9a passes through aerationThe water inlet of vertical subsurface flow wetland 4.The top of aeration vertical subsurface flow wetland 4 is provided with the water distributor 10 that a row equidistantly arranges, respectivelyOne end of root water distributor 10 is connected with water inlet pipe b 9b and perpendicular to water inlet pipe b 9b, and the other end is closed.Each water distributor 10Tilt, each water distributor 10 is 3 ‰～10 ‰ with the angle of horizontal plane, one end that each water distributor 10 is connected with water inlet supervisor 9 is higher thanThe other end of closing.The bottom of water distributor 10 and the top contact of substrate 8, the bottom of water distributor 10 is drilled with the draining of more than two rowsHole.The bottom of aeration vertical subsurface flow wetland 4 is provided with the collector pipe 11 that a row equidistantly arranges, and collector pipe 11 is contacted with substrate 8Part be drilled with the inlet opening of more than three rows.Aeration vertical subsurface flow wetland 4 bottom side is provided with the drain header 12 of horizontal positioned,Drain header 12 includes the middle part of branch drain a 12a and branch drain b 12b, branch drain a 12a and branch drain b 12bConnection, branch drain b 12b passes through the draining of aeration vertical subsurface flow wetland 4 parallel to water inlet pipe b 9b, branch drain a 12aMouthful.The layout of the intake-discharge pipe of this device is as shown in Figure 3.Branch drain a 12a is provided with the row connecting with branch drain a 12aBlank pipe 23, evacuated tube 23 is located at the top of branch drain a 12a and is located at outside aeration vertical subsurface flow wetland 4, and evacuated tube 23 setsThere is equidistant outlet valve 24.It is provided between row etc. near aeration vertical subsurface flow wetland 4 side-walls in aeration vertical subsurface flow wetland 4Away from the vertical tube 13 of arrangement, vertically placement, vertical tube top 13 is higher than substrate 8 surface and end sealing.One end of each collector pipe 11Connect with branch drain b 12b and perpendicular to branch drain b 12b, other end vertical tube 13 corresponding with this drain pipe connects.It is interspersed with plastic flexible pipe 14 in each vertical tube 13, in each collector pipe 11, be provided with nanometer micropore aeration tube 15.Aeration vertical subsurface flow wetland 4Periphery be provided with dissolved oxygen measurement and control host computer 16 and aerator 17, the air outlet of aerator 17 is connected with total air supply pipe 18, respectively mouldsOne end of material flexible pipe 14 is connected with total air supply pipe 18, and the other end connects with this corresponding nanometer micropore aeration tube 15 of plastic flexible pipe 14Logical, drain header 12 and aeration vertical subsurface flow wetland 4 discharge outlet junction are provided with dissolved oxygen observing and controlling sensor 19, and dissolved oxygen is surveyedControl sensor 19 is connected with dissolved oxygen measurement and control host computer 16, and dissolved oxygen measurement and control host computer 16 is connected with aerator 17.In the present embodiment, exposeGas vertical subsurface flow wetland 4 is rectangular pond, and its a size of 10m length × 8m width × 1.8m is deep.Water inlet and discharge outlet are respectivelyOn the relative side wall of aeration vertical subsurface flow wetland 4.The porous of aeration vertical subsurface flow wetland 4 three layers of different size of internal fillingHaydite, three layers of particle diameter are followed successively by 30～50mm, 15～30mm, 5～15mm from bottom to top, thickness be followed successively by 50cm, 50cm,60cm, total depth 1.6m.Porous ceramic grain mean porosities are 0.45, hydraulic load 2.0m/d, and hydraulic detention time is 8.6h.BaseVascular plant 25 phragmites communiss are planted on matter 8 surface, and vascular plant 25 takes root ability by force, and its root can go deep into and be covered with hypothallusesIn, oxygen can be transported to plant root by vascular bundle by vascular plant 25, be hypothalluses supplemental oxygen.
A diameter of 75mm of water distributor 10, in water inlet supervisor 9, water inlet pipe a 9a's and water inlet pipe b 9b is a diameter ofA diameter of 75mm of 110mm, collector pipe 11 and vertical tube, a diameter of 160mm of evacuated tube 23, total air supply pipe 18 a diameter of50mm, the internal diameter of plastic flexible pipe 14 is 10mm, external diameter is 13mm, and the internal diameter of nanometer micropore aeration tube 15 is 10mm, external diameter is15mm.In drain header 12, the diameter of branch drain a 12a and branch drain b 12b is 160mm.The bottom of water distributor 10 is boredThere are two trestle column 10～20cm, the osculum of diameter 5～6mm, each water distributor 10 is 3 ‰ with the angle of horizontal plane, concrete bottomPlate 22 is 3 ‰ with the angle of aeration vertical subsurface flow wetland 4 bottom surface.Be drilled with collector pipe 11 three trestle column 10～15cm, diameter 5～The inlet opening of 6mm.Nanometer micropore aeration tube 15 is suitable with the length of collector pipe 11.The material of all water pipes is pvc.
The parameters of aerator 17: power 1.6kw；Gas output 150m3/h；Air pressure 28kpa.According to dissolved oxygen observing and controlling masterThe oxygen limit that machine 16 is arranged, oxygen limit is set as 1.5～3.0mg/l, and less than oxygen, aerator 17 automatically turns in limited time, higher than oxygen in limited time certainlyDynamic stopping.
Described deflector type horizontal subsurface flow wetland 5 is the pond of brick mix structure, as shown in Figure 4 and Figure 5.Deflector type level is divedStream wetland 5 is provided with water inlet and outlet.It is provided with parallel staggered deflected current wall 20, deflected current wall in deflector type horizontal subsurface flow wetland 5The 20 water bafflings making entrance deflector type horizontal subsurface flow wetland 5, extend sewage flow process, when increased sewage contact with substrate 8Between, simultaneously prevented also from wetland bed interior " short flow phenomenon ", improve wetland bed utilization ratio.Deflector type horizontal subsurface flow wetlandIt is filled with the stronger substrate of absorbability 8 in 5, the angle of deflector type horizontal subsurface flow wetland 5 bottom surface and horizontal plane is 3 ‰～10 ‰, deflector type horizontal subsurface flow wetland 5 bottom surface is near the side that the side of its water inlet is higher than near its outlet.The present embodimentIn, deflector type horizontal subsurface flow wetland 5 is rectangular pond, and its a size of 21m length × 8m width × 1.2m is deep, and deflector type level is divedStream wetland 5 bottom surface is 3 ‰ with the angle of horizontal plane, and bottom adopts concreting.Substrate 8 is porous ceramic grain, porosity 0.45,Depth of cracking closure 1.0m.Deflector type horizontal subsurface flow wetland 5 average hydraulic load is 1.2m/d, hydraulic detention time 9.1h.Deflector typePlantation shallow root hygrophyte 26 Canna generalis Bailey in substrate 8 surface in horizontal subsurface flow wetland 5.
The water outlet at sedimentation tank 3 top is provided with flow divider 21, the outlet of sedimentation tank 3 pass through flow divider 21 respectively with exposureThe water inlet pipe a 9a of gas vertical subsurface flow wetland 4 connects with the water inlet of deflector type horizontal subsurface flow wetland 5, and aeration vertical subsurface flow is wetGround 4 branch drain a 12a also connect with the water inlet of deflector type horizontal subsurface flow wetland 5, water storage oxygenation pond 7 be provided with water inlet withOutlet, the outlet of deflector type horizontal subsurface flow wetland 5 is connected with the water inlet of ultraviolet sterilizer 6, ultraviolet sterilizer 6Outlet is connected with the water inlet of water storage oxygenation pond 7, is provided with microporous aeration disc, water storage oxygenation pond 7 outlet in water storage oxygenation pond 7The water flowing out is re-used as cultivation water again.In the present embodiment, the metered flow of ultraviolet sterilizer 6 is 43～46m3/h；Water storageThe size of oxygenation pond 7 is that 4m length × 2m width × 2m is deep, installs 5 nanometer micropore aeration plates, nanometer micropore aeration plate and room in pondThe interior aerator for fishpond oxygen supplement is connected.
The method of the industrialized aquiculture tail water efficient denitrification device denitrogenation that the present invention provides is as follows:
1) aquaculture tail water is filtered with Microfilter, filter cake is used as flowers base manure, filtrate after dewaterer squeezing mummificationEnter into anaerobic fixed film reactor through pipeline from the outlet of Microfilter, the larger molecular organicses of the difficult degradation in degraded filtrate, anaerobismThe outlet from anaerobic fixed film reactor top for the water outlet in hydrolytic tank enters into sedimentation tank through pipeline, the mud in precipitation sewage.
2) the flow divider shunting by sedimentation tank water outlet for the water outlet in sedimentation tank, it is vertical that a part of water outlet enters aerationIn current wetland water inlet supervisor, enter in substrate by the osculum of water distributor, ammonia nitrogen in substrate absorption effluent, nitrate nitrogen and AsiaNitrate nitrogen etc., ammonia nitrogen, nitrate nitrogen and nitrite nitrogen etc. are collected in substrate, pass through to control aerator continuously to hang down to aeration simultaneouslyStraight current wetland provides oxygen, and oxygen passes through the nanometer micropore aeration tube and collector pipe bottom up from aeration vertical subsurface flow wetlandDiffusion, the Nitrification for the microorganism in substrate provides oxygen and inorganic carbon source (carbon dioxide)；Another part water outlet and warpThe mixing of water that aeration vertical subsurface flow wetland was processed flow into carry out in deflector type horizontal subsurface flow wetland microorganism Nitrification (withIt is also possible to short distance nitration/denitrification, Anammox (anammox) etc. based on heterotrophic denitrification), wherein pass through shuntingThe inflow that valve flows directly into deflector type horizontal subsurface flow wetland typically constitutes from the 10%～90% of the total water yield of sedimentation tank, with specific reference toOrganic substance in sedimentation tank water outlet, ammonia nitrogen level, the Nitrification intensity of aeration vertical subsurface flow wetland and organic matter degradation situationDepending on.
3) water outlet of deflector type horizontal subsurface flow wetland enters ultraviolet sterilizer, carries out sterilization processing, ultraviolet sterilizerWater outlet enter water storage oxygenation pond, pass back into culturing area fishpond after aeration aerating and carry out reuse.
Series of experiments proves that this device is applied to the regulation and control of high-quality Fish high-density breeding water quality, can guarantee that hybrid sturgeonBreeding water demand.Sturgeon cultivates tail water after the process of this device, to tn, nh4+-n、no2-- n and codmnClearance respectively highReach 71.3～88.1%, 69.2～73.5%, 73.6～81.7% and 75.9～89.4%, through water storage oxygenation pond aeration aeratingAfterwards, dissolved oxygen reaches more than 5mg/l, meets sturgeon breeding water demand.