CN102963970A - Device and process for preparing struvite crystals from nitrogen and phosphorus in sewage - Google Patents
Device and process for preparing struvite crystals from nitrogen and phosphorus in sewage Download PDFInfo
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- CN102963970A CN102963970A CN2012104549199A CN201210454919A CN102963970A CN 102963970 A CN102963970 A CN 102963970A CN 2012104549199 A CN2012104549199 A CN 2012104549199A CN 201210454919 A CN201210454919 A CN 201210454919A CN 102963970 A CN102963970 A CN 102963970A
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Abstract
The invention relates to a device and a process for preparing struvite crystals from nitrogen and phosphorus in sewage. The device comprises a reactor (5), a pH (potential of Hydrogen) controller (25), a pH regulating pump (24), an alkali liquor tank (23), a nitrogen and phosphorus containing waste water tank (22) and a secondary sedimentation tank (19), wherein the reactor (5) is composed of a reactor feed pipe (9), a reactor crystal collecting pipe (8), a reactor growth tube (3) and a reactor sediment tube (2) from bottom to top. The process comprises the steps of pumping nitrogen and phosphorus containing wastewater into the reactor (5) and pumping a magnesium chloride solution into the reactor (5) to ensure that the molar ratio of NH3-N to PO43-P to Mg <2+> in the reactor (5) is (1:1:1)-(1:1:1.3); controlling the reflux ratio between 14 and 28 and the pH equal to 6.4-9.2; and forming the struvite crystals in the reactor (5) by using the nitrogen, phosphorus and magnesium containing solution. The device disclosed by the invention has the advantages of simple structure and small floor space, is simple and easy to operate and difficult to scale, can be widely applied to preparation of the struvite crystals from the nitrogen and phosphorus containing wastewater such as coking wastewater, pig manure wastewater or sludge fermentation liquor, and is capable of realizing the resource recycling of nitrogen and phosphorus.
Description
Technical field
The present invention relates to a kind of device and technique that nitrogen phosphorus in the sewage is prepared into struvite crystals.Specifically utilize struvite crystallization granulating technology to reclaim device and the technique of nitrogen phosphorus in the sewage, belong to wastewater treatment and application technology as the second resource field thereof.
Background technology
Contained nitrogen, phosphorus is the main inducing that causes the body eutrophication problems such as lake, river and ocean in the sewage, along with the development of industrial and agricultural production and the raising of living standards of the people, the quantity discharged of China's nitrogen and phosphorus pollutants sharply increases, the body eutrophication that causes serious harm has also consisted of great threat to water hygiene and food safety simultaneously to the development of all conglomeraties such as agricultural, fishery, tourism.
Yet nitrogen is one of essential nutrient of plant-growth, and it is the integral part of each cell, and growing of plant needs a large amount of nitrogen.Phosphorus is the essential element that comprises human all life body, is a kind of non-renewable precious resources, and the reserves of Rock Phosphate (72Min BPL) are very limited on the earth.Therefore, from the sustainable use dual purpose of body eutrophication control and nitrogen phosphor resource, reuse nitrogen phosphor resource is a kind of selection of the best from waste water.
Struvite crystallization (magnesium ammonium phosphate MgNH
4PO
4﹒ 6H
20) sewage middle and high concentration nitrogen phosphorus can be removed and reclaim to method simultaneously, reaches " doulbe-sides' victory " target of the innoxious and resource utilization of sewage, is a kind of very promising sustainable water technology, receives much concern in recent years.More with the case study of struvite precipitation forms recovery nitrogen phosphorus at present, such as Chinese patent application 201010169236.X " the employing struvite precipitator method reclaim device and the processing method of phosphorus from waste water ", Chinese patent application 200810060987.0 " devices and methods therefor of reclaiming sewerage nitrogen and phosphor by ammoniomagnesium phosphate crystal method " and Chinese patent application 201010141900.X " integrated nitrogen and phosphorus recovery device in struvite method " etc., all there are the problems such as the crystal utility value is low, organic efficiency is low, the easy fouling of device in these methods.
Device and the patent device of Chinese patent application 201010141900.X " a kind of integrated nitrogen and phosphorus recovery device in struvite method " are similar: from bottom to top set gradually the functional zone such as settling region, hybrid reaction district, crystal vitellarium, crystal trapping and exhalant region, each function section cross-sectional area is staged to be increased.It is micro crystal that but this device forms struvite crystals, does not have the generation of struvite particle, is unfavorable for the collection of struvite; Simultaneously, this patent adopts aerating apparatus to promote the struvite crystals growth and prevents crystal fouling on reactor wall, but can make the obvious increase of power charge.
Struvite crystallization granulating technology is according to mechanism of crystal growth, by supersaturated condition in the control reactor, makes small struvite crystals grow into gradually larger struvite particle, and then removes from water.Struvite crystallization granulating technology is the innovation of traditional struvite precipitator method being reclaimed nitrogen phosphorus technology, the variety of problems such as the intrinsic solid-liquid separation difficulty of traditional precipitator method, the easy fouling of equipment have been overcome, simultaneously can gather in the crops high-quality particle struvite product, the industrial applications that makes the struvite crystallization process reclaim nitrogen phosphorus technology from waste water becomes possibility.
Summary of the invention
The objective of the invention is to disclose a kind of apparatus and method that adopt struvite crystallization granulation to reclaim the nitrogen phosphor resource from waste water, device construction of the present invention is simple, and is easy and simple to handle, low-energy-consumption high-efficiency.
Another object of the present invention is with the nitrogen phosphorus waste water (NH of this device to different concns
3The concentration of-N is 100 ~ 1000mg/L, PO
4 3--P is that the oarse-grained method of struvite is reclaimed in 200 ~ 2200mg/L) formation.The high grain diameter of the purity of struvite particle is large.The present invention has carried out X-ray diffraction analysis (XRD) and electronic scanning electronic microscope photos (SEM) to crystallized product, determines that crystallized product is struvite.
In order to achieve the above object, the device of invention comprises reactor, the pH controller, the pH regulator pump, alkali liquid tank, the Nitrogen-and Phosphorus-containing wastewater trough, second pond, the second pond overflow weir, the second pond water outlet, its structural feature is: reactor is from bottom to top by the reactor feed pipe, reactor crystal collection tube, reactor becomes long tube and reactor sediment tube to consist of, reactor sediment tube top is provided with the reactor overflow weir, the top of reactor overflow weir and reactor sediment tube is socketed into one, reactor overflow weir bottom and be positioned at the reactor sediment tube peripheral hardware device water outlet that responds, the reactor water outlet is connected with second pond; Reactor sediment tube bottom becomes the long tube top to be fixedly connected with reactor, and the diameter of reactor sediment tube is 2 times of diameter of reactor crystal growth pipe; It is large above being shaped as of long tube that reactor becomes, below little horn shape, outside diameter: end diameter=3:1, reactor become the length of long tube: end diameter=40:1; Reactor becomes the long tube bottom to be connected with reactor crystal collection tube by the growth tube valve; Reactor crystal collection tube bottom is fixedly connected with reactor feed pipe top and is integral, and the reactor feed pipe is provided with 4 charging openings and a discharge opening, and these 4 charging openings comprise that magnesium salts adds entrance, backflow water-in, sewage import and adds the alkali mouth; The pH probe is arranged in the reactor crystal collection tube, and the pH probe is connected with the pH controller; The pH controller is connected with the pH regulator pump; PH regulator pump one end is connected with alkali liquid tank, an other end with add the alkali mouth and be connected (reaching automatic control pH purpose); The backflow water-in is connected (form and reflux) by the backflow wing pump with second pond; The sewage import is connected with the Nitrogen-and Phosphorus-containing wastewater trough by fresh feed pump; Magnesium salts adds entrance and is connected with the magnesium salts tank by the magnesium salts pump.
A kind of nitrogen phosphorus in the sewage is made the technique of struvite crystals, it is characterized in that: make up first and aforesaidly a kind of nitrogen phosphorus in the sewage is made the device of struvite crystals, then with NH
3The concentration of-N is 100 ~ 1000mg/L, PO
4 3-The concentration of-P is that the Nitrogen-and Phosphorus-containing waste water of 200 ~ 2200mg/L pumps in the Nitrogen-and Phosphorus-containing wastewater trough, preparation contains the magnesium chloride solution that magnesium ion concentration is 155 ~ 2214mg/l in the magnesium salts tank, by the magnesium salts pump magnesium chloride solution is also pumped into reactor (5), by the waste water wing pump Nitrogen-and Phosphorus-containing waste water is also pumped into reactor, make the NH in the reactor
3-N:PO
4 3-P:Mg
2+Mol ratio is 1:1:1 ~ 1:1:1.3, open an end and be connected the reflux pump that an other end is connected with the backflow water-in with second pond, the control reflux ratio is 14 ~ 28, the pH value by pH probe Real-Time Monitoring inside reactor simultaneously, monitor signal is passed to the pH controller, the pH controller injects alkaline solution by the pH regulator pump in reactor, making the interior pH value of reactor is 6.4 ~ 9.2; The solution of nitrogenous, phosphorus and magnesium mixes in reactor, form the small crystallization of struvite, after 3 ~ 4 days, some particles are large to overcoming reactor upwelling resistance, fall into reactor crystal collection tube, close the growth tube valve this moment, opens discharge opening, shifts out the struvite micro-crystallization, the struvite micro-crystallization that detection is shifted out, profile is ganoid spheroidal, and its diameter is 4 ~ 7mm, and purity is higher than 97%; The reactor overflow weir flow of the reactor sediment tube by answering the device top is to the water outlet of second pond, discharges further remove fine particle in second pond after.
Above-mentioned Nitrogen-and Phosphorus-containing waste water is coking chemical waste water, pig manure waste water, sludge fermentation liquid etc.
Advantage of the present invention and effect are as follows:
1, apparatus structure is compact.Reactor of the present invention vertically upward, cross-sectional area increases gradually with the increase of height for reactor between the reactor growth pipe adjacent tubular segments, the interior upflow velocity of reactor growth pipe is successively decreased, strengthened the turbulence intensity of crystal vitellarium, reach the cylinder endoparticle by the purpose of size layering, larger particle can overcome flow action and fall into reactor bottom, the particle that particle diameter is less then rests on the reactor middle and upper part, regularly reclaim larger particles from reactor bottom, less particle is moved out of until fall into reactor bottom then as the crystal seed continued growth.
2, second pond the small crystal that can further remove in the water outlet is set, optimize effluent quality.On the other hand, the mixed-liquor return in the second pond to inside reactor, not only can be diluted water inlet, create better crystallization condition, the fluidized state of all right enhancing reactor column body, refluxing the small crystal of introducing can also be as the crystal seed continued growth.
3, pH condition in the reactor can be accurately controlled in the effect of cooperatively interacting of pH on-line monitoring system and automatic alkali adding device, for struvite crystallization granulating is created top condition.
4, apparatus main body of the present invention is a fluidized-bed reactor and a second pond, optimizes reaction conditions by pH on-line monitoring system and automatic medicament feeding system.Whole apparatus structure is simple, and floor space is little, and is easy to operation.
5, less scaling, continuously operation steady in a long-term.But reactor sediment tube effectively catching struvite particle and powder that the device upper end arranges make tiny struvite reduce with the possibility that current run off, thereby reduce the rate of loss of struvite.
6, the variety of problems such as solid-liquid separation difficulty, the easy fouling of equipment have been overcome, because the present invention obtains the struvite macrobead by the binding crystal growth, avoided the common reactor fouling problem of traditional struvite precipitator method, but made the reactor continuous and steady operation, the manual maintenance expense reduces.And can gather in the crops high-quality particle struvite product, the industrial applications that makes the struvite crystallization process reclaim nitrogen phosphorus technology from waste water becomes possibility, has important social effect and realistic meaning.
7, the present invention reclaims the nitrogen phosphor resource with the form of particle struvite from waste water, good effect of separating solid from liquid, and the struvite particle purity of formation is high, hardness is large, is convenient to collect and transportation, and utility value is higher.Adopt device of the present invention and technique, the struvite particle diameter that is recovered to from Nitrogen-and Phosphorus-containing waste water is 8mm to the maximum, and purity is more than 97%, and pellet hardness is larger.
Description of drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is the structural representation of reactor of the present invention.
Fig. 3 is the structural representation of the reactor water distribution pipe of reactor of the present invention.
Fig. 4 is struvite crystallization X-ray diffraction analysis figure of the present invention (XRD)
Fig. 5 is struvite electronic scanning electronic microscope photos figure of the present invention---amplifies 24 times (SEM)
Fig. 6 is struvite electronic scanning electronic microscope photos figure of the present invention---amplifies 1000 times (SEM)
Fig. 7 is struvite electronic scanning electronic microscope photos figure of the present invention---amplifies 2000 times (SEM)
Fig. 8 is struvite electronic scanning electronic microscope photos figure of the present invention---amplifies 5000 times (SEM).
Among Fig. 1: 1-reactor overflow weir; 2-reactor sediment tube; 3-reactor growth pipe; 4-magnesium salts deposit bucket; 5-reactor; 6-growth tube valve; The 7-ph probe; 8-reactor crystal collection tube; 9-reactor feed pipe; 10-magnesium salts adds entrance; 11-magnesium salts wing pump; 12-crystal outlet valve; 13-reactor frame; 14-backflow water-in; The 15-water intake; 16-add the alkali mouth; 17-waste water wing pump; 18-backflow wing pump; 19-second pond; 20-second pond water outlet; 21-second pond overflow weir; 22-Nitrogen-and Phosphorus-containing waste water; 23-lye vat; 24-automatic alkali adding pump; 25-ph controller; 26-reactor water outlet; 27-answer device Ph probe interface.
Among Fig. 4: X-coordinate is angle 2 θ, and ordinate zou is intensity, and B represents the standard spectrogram of struvite crystals, and A is the spectrogram that the present invention generates struvite crystals.AB two figure peak types are similar, and the peak 020 that intensity is the highest among the A figure, 111 corresponding with the climax of B figure with 022, illustrate that the crystal that the present invention generates is struvite.
Embodiment
Embodiment 1
Please refer to accompanying drawing 1-3.Make up device of the present invention.
Make reactor 5 with transparent synthetic glass.Reactor 5 comprises that from top to bottom reactor overflow weir 1, reactor sediment tube 2, reactor become long tube 3, reactor crystal collection tube 8 and reactor feed pipe 9.Make first a reactor and become long tube 3, this reactor becomes the pipe of the up big and down small horn shape of being shaped as of long tube 3, outside diameter: end diameter=3:1; Reactor becomes the length of long tube 3: end diameter=40:1.Reactor becomes the outside diameter top of long tube 3 and the bottom firm welding of reactor sediment tube 2, the diameter of reactor sediment tube 2 is 2 times of outside diameter of reactor crystal growth pipe 3, the top of reactor sediment tube 2 is provided with reactor overflow weir 1, the bottom face center on reactor overflow weir 1 and the top of reactor sediment tube 2 are socketed into one, at reactor overflow weir 1 bottom end face and be positioned at outside the reactor sediment tube 2, be provided with reactor water outlet 26, reactor water outlet 26 is connected with second pond 19.
Reactor becomes long tube 3 bottoms to be connected with reactor crystal collection tube 8 by growth tube valve 6, reactor crystal collection tube 8 is the identical pipe of diameter up and down, its diameter becomes long tube 3 end diameter sizes identical with reactor, the tube wall of reactor crystal collection tube 8 is offered reactor Ph probe interface 27, pH probe 7 is installed in the reactor Ph probe interface 27, pH probe 7 and pH controller 25, pH regulator pump 24, alkali liquid tank 23 connects.Reactor crystal collection tube 8 bottoms are fixedly connected with reactor feed pipe 9 tops and are integral, and reactor feed pipe 9 offers 4 opening for feeds and a discharge opening 13, and crystal outlet valve 12 is installed on the discharge opening 13.These 4 charging openings comprise a backflow water-in 14, and backflow water-in 14 is connected with second pond 19 by backflow wing pump 18; A water intake 15, water intake 15 is connected with Nitrogen-and Phosphorus-containing wastewater trough 22 by fresh feed pump 17; A magnesium salts adds entrance 10, be connected with magnesium salts tank 4 by magnesium salts pump 11, a pH regulator mouth 16, pH regulator mouth 16 is automatically regulated pump 24 with pH and is connected, this pH automatically regulates pump 24 the other ends and is connected with alkali liquid tank 23, pH automatically regulates pump 24 other ends and also is connected with pH on-line monitoring instrument 25, and pH on-line monitoring instrument 25 is connected with pH probe 7.
After structure is finished with NH
3The concentration of-N is 100 ~ 1000mg/L, PO
4 3-The concentration of-P is that the Nitrogen-and Phosphorus-containing waste water of 200 ~ 2200mg/L pumps in the Nitrogen-and Phosphorus-containing wastewater trough 22, and preparation contains the magnesium chloride solution that magnesium ion concentration is 155 ~ 2214mg/l in magnesium salts tank 4; Then Nitrogen-and Phosphorus-containing waste water is pumped into reactor 5 by fresh feed pump 17 and sewage import 15 successively, magnesium chloride solution is added entrance 10 by magnesium salts pump 11 and magnesium salts successively also pump into reactor 5, pump into the NH of reactor
3-N:PO
4 3-P:Mg
2+Mol ratio is that 1:1:1 ~ 1:1:1.3 opens an end and is connected the backflow wing pump 18 that an other end is connected with backflow water-in 14 with second pond 19; The control reflux ratio is 14 ~ 28, by the pop one's head in pH value of 7 Real-Time Monitoring reactors, 5 inside of pH, monitor signal is passed to pH controller 25 simultaneously, and to reactor 5 injection alkaline solutions, make reactor 5 interior pH values is 6.4 ~ 9.2 to pH controller 25 by pH regulator pump 24; The solution of nitrogenous, phosphorus and magnesium is in the interior mixing of reactor 5, form the small crystallization of struvite, after 3 ~ 4 days, some particles are large to fall into reactor crystal collection tube 8 to overcoming reactor upwelling resistance, closes growth tube valve 6 this moment, shift out the struvite micro-crystallization, the struvite micro-crystallization that shifts out is detected: this struvite micro-crystallization diameter is 2 ~ 7mm, is shaped as ganoid spheroidal, and purity is higher than 97%; Water outlet flows to second pond 19 from the reactor overflow weir 1 of the reactor sediment tube 2 of reactor head, processes in the place that second pond 19 is interior to be discharged to appointment after further removing fine particle again.
Analog synthesis ammonia waste water NH
3-N concentration is 400mg/L, namely first 1 ton of water is pumped into Nitrogen-and Phosphorus-containing wastewater trough 22, adds chloride solid 1.528Kg in wastewater trough 22, will add among the Sodium phosphate dibasic solid 10.228Kg in the ammonia nitrogen waste water, at this moment NH in the simulated wastewater again
3-N concentration is 400mg/L, PO
4 3-P concentration is that 885.7mg/L (keeps NH
3-N:PO
4 3-P mol ratio 1:1).Configuration contains the magnesium chloride solution that magnesium ion concentration is 685.7mg/l (be in the 1t water add 5.800kg magnesium chloride solids), by magnesium salts wing pump 11 with MgCl
2Solution adds entrance 10 according to the mol ratio of N:P:Mg=1:1:1 by magnesium salts and pumps into reactor 5, by waste water wing pump 17 the synthetic ammonia waste water in the Nitrogen-and Phosphorus-containing wastewater trough 22 is also pumped into reactor 5 by water intake 15.Open PH and regulate pump 24, the NaOH solution in the lye vat 23 are also pumped into reactor 5 by adding alkali mouth 16, the pH value in the ph controller 25 monitoring reactors 5, pH keeps 6.9 ± 0.1, open backflow wing pump 18, make to produce between reactor 5 and the second pond 19 and reflux, the control reflux ratio is 28.Because reactor 5 is transparent, can observe the 5 inner clarifications of initial reaction device, show without the struvite precipitation to generate.The struvite crystallization reaction occurs immediately, and the starting stage, all particles are all very little, and crystal growth rate is lower.After 3 ~ 4 days, some particles are large in the reactor crystal collection tube 8 that can fall into reactor 5 bottoms, and close growth tube valve 6 this moment, shifts out a part of particle.After this, but shift out the part particle every day, after shifting out at every turn, reactor 5 top particle continued growths, after fall into again in the reactor crystal collection tube 8.The struvite crystals particle of collecting is ganoid spheroidal, diameter 4 ~ 7mm, and purity is higher than 97%.Through X-ray diffraction analysis (XRD) and electronic scanning electronic microscope photos (SEM), to shown in Figure 8, the gained crystal is struvite crystals such as Fig. 4.
Reactor 5 water outlets are clarified substantially, measure NH after filtering with the 0.45um mocromembrane
3-N, PO
4 3-P content records NH
3-N and PO
4 3-The clearance of P all can reach 70%,, the reactor water outlet is through after the further biochemical treatment, and water outlet can reach the upper standard of national sewage row, can directly discharge.
Embodiment 3
Change synthetic ammonia waste water into glyphosate wet oxidation pretreated waste water, NH in this glyphosate wet oxidation pretreated waste water
3-N concentration is 1000mg/L.First 1 ton of water is pumped into Nitrogen-and Phosphorus-containing wastewater trough 22, add respectively chloride solid 3.821kg and Sodium phosphate dibasic solid 25.571kg to Nitrogen-and Phosphorus-containing wastewater trough 22, make NH in the waste water
3-N concentration is 1000mg/L, PO
4 3-P concentration is that 2214.28mg/L (keeps NH
3-N:PO
4 3-P mol ratio 1:1), configuration contains the magnesium chloride solution that magnesium ion concentration is 2228.56mg/l, namely adds the 18.85kg magnesium chloride solids in 1 ton of water, pumps into the NH of reactor this moment
3-N:PO
4 3-P:Mg
2+Mol ratio is 1:1:1.25.Adopt the adjusting of NaOH solution and keep pH=6.4 ± 0.1, other conditions are identical with embodiment 1.Through X-ray diffraction analysis (XRD) and electronic scanning electronic microscope photos (SEM), to shown in Figure 8, the particle of experiment results is struvite crystals such as Fig. 4.
Reactor 5 water outlets are clarified substantially, measure NH after filtering with the 0.45um mocromembrane
3-N, PO
4 3-P content records NH
3-N and PO
4 3-The clearance of P is respectively 73.7% and 62.1%, and the reactor water outlet is similar to the simulated wastewater water quality of embodiment 2, can by the method for embodiment 2, again remove the NH in the waste water
3-N and PO
4 3-P, and the water outlet after processing through the method for embodiment 2 can be by further biochemical treatment after, water outlet can reach national sewage row and go up standard, can directly enter rivers.
Embodiment 4
Except pH keeps 8.8 ± 0.1, all the other conditions are identical with embodiment 3.Under this condition, crystalline growth velocity is accelerated, and inside reactor begins to occur muddy, shows to begin to generate the struvite precipitation.The struvite particle begins with the crystal combination growth and assembles the growth dual mode to increase.1 ~ 2 day, some particles were large in the reactor crystal collection tube 8 that can fall into reactor bottom.The particle of collecting is ganoid spheroidal, diameter 3 ~ 4mm, and purity is higher than 97%.Utilize the struvite particle of present method results such as accompanying drawing 5 to shown in Figure 8.
Occur small crystal in reactor 5 water outlets, measure NH after filtering with the 0.45um mocromembrane
3-N, PO
4 3-P content records NH
3-N and PO
4 3-The clearance of P all can reach 95%, and the reactor water outlet is through after the further biochemical treatment, and water outlet can reach the upper standard of national sewage row, can directly discharge.
Claims (3)
1. device of nitrogen phosphorus in the sewage being made struvite crystals, comprise reactor (5), pH controller (25), pH regulator pump (24), alkali liquid tank (23), Nitrogen-and Phosphorus-containing wastewater trough (22), second pond (19), second pond overflow weir (21), second pond water outlet (20), it is characterized in that: reactor (5) is from bottom to top by reactor feed pipe (9), reactor crystal collection tube (8), reactor becomes long tube (3) and reactor sediment tube (2) to consist of, reactor sediment tube (2) top is provided with reactor overflow weir (1), reactor overflow weir (1) is socketed into one with the top of reactor sediment tube (2), reactor overflow weir (1) bottom and be positioned at reactor sediment tube (2) the peripheral hardware device water outlet (26) that responds, reactor water outlet (26) is connected with second pond (19); Reactor sediment tube (2) bottom becomes long tube (3) top to be fixedly connected with reactor, and the diameter of reactor sediment tube (2) is 2 times of diameter of reactor crystal growth pipe (3); It is large above being shaped as of long tube (3) that reactor becomes, below little horn shape, outside diameter: end diameter=3:1, reactor become the length of long tube (3): end diameter=40:1; Reactor becomes long tube (3) bottom to be connected with reactor crystal collection tube (8) by growth tube valve (6); Reactor crystal collection tube (8) bottom is fixedly connected with reactor feed pipe (9) top and is integral, reactor feed pipe (9) is provided with 4 charging openings and a discharge opening (13), and these 4 charging openings comprise that magnesium salts adds entrance (10), backflow water-in (14), sewage import (15) and adds alkali mouth (16); PH probe (7) is arranged in the reactor crystal collection tube (8), and pH probe (7) is connected with pH controller (25); PH controller (25) is connected with pH regulator pump (24); PH regulator pump (24) one ends are connected with alkali liquid tank (23), an other end with add alkali mouth (16) and be connected; Backflow water-in (14) is connected with second pond (19) by backflow wing pump (18); Sewage import (15) is connected with Nitrogen-and Phosphorus-containing wastewater trough (22) by fresh feed pump (17); Magnesium salts adds entrance (10) and is connected with magnesium salts tank (4) by magnesium salts pump (11).
2. one kind nitrogen phosphorus in the sewage made the technique of struvite crystals, it is characterized in that: make up first and as claimed in claim 1ly a kind of nitrogen phosphorus in the sewage is made the device of struvite crystals, then with NH
3The concentration of-N is 100 ~ 1000mg/L, PO
4 3-The concentration of-P is that the Nitrogen-and Phosphorus-containing waste water of 200 ~ 2200mg/L pumps in the Nitrogen-and Phosphorus-containing wastewater trough (22), preparation contains the magnesium chloride solution that magnesium ion concentration is 155 ~ 2214mg/l in magnesium salts tank (4), by waste water wing pump (17) Nitrogen-and Phosphorus-containing waste water is pumped into reactor (5), by magnesium salts pump (11) magnesium chloride solution is also pumped into reactor (5), make the NH that pumps into reactor (5)
3-N:PO
4 3-P:Mg
2+Mol ratio is 1:1:1 ~ 1:1:1.3, open an end and be connected the reflux pump (18) that an other end is connected with backflow water-in (14) with second pond (19), the control reflux ratio is 14 ~ 28, simultaneously by the inner pH value of pH probe (7) Real-Time Monitoring reactor (5), monitor signal is passed to pH controller (25), pH controller (25) injects alkaline solution by pH regulator pump (24) in reactor (5), making the interior pH value of reactor (5) is 6.4 ~ 9.2; The solution of nitrogenous, phosphorus and magnesium mixes in reactor (5), form the small crystallization of struvite, after 3 ~ 4 days, some particles are large to overcoming reactor upwelling resistance, fall into reactor crystal collection tube (8), close growth tube valve (6) this moment, opens discharge opening (13), shifts out the struvite micro-crystallization, the struvite micro-crystallization that detection is shifted out, profile is ganoid spheroidal, and its diameter is 4 ~ 7mm, and purity is higher than 97%; The reactor overflow weir (1) of the reactor sediment tube (2) by answering the device top flows to the water outlet of second pond (19), discharges further remove fine particle in second pond (19) after.
3. according to claim 2ly a kind of nitrogen phosphorus in the sewage is made the technique of struvite crystals, it is characterized in that: above-mentioned Nitrogen-and Phosphorus-containing waste water is coking chemical waste water, pig manure waste water or sludge fermentation liquid.
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| CN104743734A (en) * | 2014-01-27 | 2015-07-01 | 同济大学 | Coupled sewage biological nitrogen and phosphorus removal and phosphate recovery method |
| WO2015128528A1 (en) * | 2014-02-26 | 2015-09-03 | Universidade De Santiago De Compostela | Method and system for the crystallisation of struvite for recovering phosphates in wastewater |
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| CN112119041A (en) * | 2018-05-16 | 2020-12-22 | 奥斯特拉营养康复技术有限公司 | Method for treating phosphate-containing wastewater and controlling fine particles |
| RU2756807C1 (en) * | 2020-12-01 | 2021-10-05 | федеральное государственное автономное образовательное учреждение высшего образования "Пермский национальный исследовательский политехнический университет" | Method for the regeneration of nitrogen and phosphorus from wastewater by precipitation of their ions in the form of struvite |
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| CN104743734A (en) * | 2014-01-27 | 2015-07-01 | 同济大学 | Coupled sewage biological nitrogen and phosphorus removal and phosphate recovery method |
| CN104743734B (en) * | 2014-01-27 | 2016-06-15 | 同济大学 | A kind of method that manifold type bio-denitrifying sewage dephosphorization is reclaimed with phosphate |
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| WO2015128528A1 (en) * | 2014-02-26 | 2015-09-03 | Universidade De Santiago De Compostela | Method and system for the crystallisation of struvite for recovering phosphates in wastewater |
| CN103935974B (en) * | 2014-03-24 | 2016-11-09 | 同济大学 | A kind of method that sewage middle and high concentration ammonia nitrogen is recovered as high-purity big particle guanite |
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| CN104129771A (en) * | 2014-08-14 | 2014-11-05 | 广东石油化工学院 | Method for separating and recycling struvite crystal precipitates |
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| CN106430506A (en) * | 2016-10-20 | 2017-02-22 | 中国科学院城市环境研究所 | Struvite fluidization and crystallization device |
| CN106512465A (en) * | 2016-11-13 | 2017-03-22 | 兰州交通大学 | Integrated circulating fluidized bed for sewage nitrogen and phosphorus recycling |
| CN107445266A (en) * | 2017-09-04 | 2017-12-08 | 中南大学 | A kind of gas-liquid fluidisation strengthens struvite crystallization granulating apparatus |
| CN107445266B (en) * | 2017-09-04 | 2020-12-15 | 中南大学 | Gas-liquid fluidization enhanced struvite crystallization granulation device |
| CN112119041A (en) * | 2018-05-16 | 2020-12-22 | 奥斯特拉营养康复技术有限公司 | Method for treating phosphate-containing wastewater and controlling fine particles |
| CN110963596A (en) * | 2018-09-29 | 2020-04-07 | 福建申远新材料有限公司 | Dephosphorization reactor for struvite crystallization method and application thereof |
| CN109607869A (en) * | 2018-12-31 | 2019-04-12 | 中北大学 | A kind of nitrophosphate fertilizer wastewater treatment method |
| RU2756807C1 (en) * | 2020-12-01 | 2021-10-05 | федеральное государственное автономное образовательное учреждение высшего образования "Пермский национальный исследовательский политехнический университет" | Method for the regeneration of nitrogen and phosphorus from wastewater by precipitation of their ions in the form of struvite |
| CN114804516A (en) * | 2022-04-15 | 2022-07-29 | 中欧环保科技南京有限公司 | Method for synchronously removing and recycling nitrogen and phosphorus from meat product processing wastewater |
| CN114835297A (en) * | 2022-05-17 | 2022-08-02 | 南京传业环保科技有限公司 | Automatic nitrogen and phosphorus recovery equipment and method for low-concentration aquaculture wastewater |
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