CN204125171U - A kind of device waste water nitrogen phosphorus being carried out to the recovery of struvite resource utilization - Google Patents
A kind of device waste water nitrogen phosphorus being carried out to the recovery of struvite resource utilization Download PDFInfo
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- CN204125171U CN204125171U CN201420458242.0U CN201420458242U CN204125171U CN 204125171 U CN204125171 U CN 204125171U CN 201420458242 U CN201420458242 U CN 201420458242U CN 204125171 U CN204125171 U CN 204125171U
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Abstract
A kind of device waste water nitrogen phosphorus being carried out to the recovery of struvite resource utilization, comprise struvite reaction unit, struvite crystals collecting mechanism (2) is provided with below shore pipe (24) outlet of struvite reaction unit, the entirety of this struvite crystals collecting mechanism is inclination angle 20 ~ 30o and cone angle cone-shaped body upwards, the cone angle of cone-shaped body is corresponding with shore pipe (24) export center of struvite reaction unit, surface coverage one deck taper polypropylene fibre anti-seepage geotextile of this cone-shaped body, between polypropylene fibre anti-seepage geotextile and cone-shaped body surface, compact winding has PVC heating wire, the periphery, bottom of this cone-shaped body is provided with remaining liquid baffle plate, remaining liquid baffle plate is connected to remaining liquid receiving tank.The utility model structure is simple, and easy and simple to handle, struvite throw out mud-water separation efficiency is high, effective.
Description
Technical field
The utility model relates to a kind of device waste water nitrogen phosphorus being carried out to the recovery of struvite resource utilization, it utilizes magnesium ammonium phosphate sediment method from waste water, remove solvability nitrogen and phosphorus pollution thing, and make it precipitation generate struvite carry out resource utilization recovery, belong to wastewater treatment and resource technology field.
Background technology
When containing Mg in waste water or solution simultaneously
2+, PO
4 3 –, NH
4 +during three kinds of ions, and ionic concn is long-pending is greater than MgNH
4pO
46H
2during O solubility product constant, there is magnesium ammonium phosphate (MAP) precipitin reaction, its crystalline deposit principle is as shown in following reaction formula (1), (2), and this phenomenon is respectively by Rawn(1939) and Borgerding(1972) study waste water treatment plant's digested sludge pipeline precipitation time find.
NH
3 + H
3O
+ + NH
4 + + H
2O （1）
Mg
2+ + PO
4 3– + NH
4 + + 6H
2O MgNH
4PO
4·6H
2O ↓ （2）
Ksp = 2.51′10
–13，pKsp = –log(Ksp) = 12.6
Precipitated product MAP (MgNH
4pO
46H
2o) be commonly called as struvite, white crystalline powder, relative density 1.71, be soluble in acid, be insoluble to alkali, water and ethanolic soln, there is the feature of slow-release nitrogen, phosphorus after applying farmland, be regarded as extremely valuable agriculture slow-release fertilizer, therefore become the study hotspot of denitrification dephosphorization technique in wastewater treatment in recent years.It has reaction and realizes fast, easily, the multiple advantage such as easy control of reaction conditions.
But this technology applying in engineering practice also has very large difficulty at present, except adding the reason of reagent cost, imperfection in reaction unit, technical process is its major influence factors, particularly engineering lacks the device to struvite precipitated product Separation and Recovery, become restriction struvite precipitation technology carries out resource utilization recycling " bottleneck " problem to nitrogen and phosphorus pollutants in waste water.In China Patent No. 201210454919.9 " nitrogen phosphorus in sewage being prepared into device and the technique of struvite crystals ", in the patents such as China Patent No. 201010169236.X " the employing struvite precipitator method reclaim device and the processing method of phosphorus from waste water " and China Patent No. 201010141900.X " integrated nitrogen and phosphorus recovery device in struvite method ", relate to struvite reactor, but support equipment is many, power consumption is high, cost of investment is large, and most of patent arranges filler in precipitin reaction district, flooding quantity can be reduced like this, augmenting response device volume, easily cause precipitate and separate effect undesirable, precipitation collects the shortcomings such as difficulty is large.Particularly this type of reclaims about the struvite precipitator method in the Patents of nitrogen phosphorus in waste water, is not reported about the technique of the follow-up dried recovered operating unit to struvite crystalline deposit thing and device.And being separated different from common solid-liquid object, the recovery carrying out struvite from waste water needs the specified conditions of oven drying at low temperature.Existing equipment for separating liquid from solid, as the equipment such as pressure filter, Mud Sepa Machine is all not suitable for the application of struvite recovery, and facility investment is high, on hundreds of thousands of unit.And struvite separated and collected device of the present utility model, structure is simple, makes material to be easy to get and cheap, according to the output of struvite in waste water, at 200 yuan-1000 yuan not etc., device separates Be very effective, is separated post-heating design and directly dries struvite and obtain finished product slow-release fertilizer cost of manufacture.
Summary of the invention
The purpose of this utility model is to provide device waste water nitrogen phosphorus being carried out to the recovery of struvite resource utilization of the periodic running that a kind of struvite Separation and Recovery is convenient, separation efficiency is high, effective, solves technology " bottleneck " problem that MAP precipitation technology lacks struvite Separation and Recovery and drying installation in engineer applied.
In order to realize above-mentioned object, the utility model adopts following technical scheme:
A kind of device waste water nitrogen phosphorus being carried out to the recovery of struvite resource utilization, comprise struvite reaction unit, struvite crystals collecting mechanism is provided with below the shore pipe outlet of struvite reaction unit, the entirety of this struvite crystals collecting mechanism is inclination angle 20 ~ 30o and cone angle cone-shaped body upwards, the cone angle of cone-shaped body is corresponding with the shore pipe export center of struvite reaction unit, surface coverage one deck taper polypropylene fibre anti-seepage geotextile of this cone-shaped body, between polypropylene fibre anti-seepage geotextile and cone-shaped body surface, compact winding has PVC heating wire, the periphery, bottom of this cone-shaped body is provided with remaining liquid baffle plate, remaining liquid baffle plate is connected to remaining liquid receiving tank.
In above-mentioned, struvite reaction unit lays in groove by reaction tank, alkali lye, groove laid in by microcosmic salt and magnesium salts deposit groove forms, wherein, the sewage water inlet pipe of reaction tank connects reaction tank through sewage pump, the alkali lye chemical feed pipe of alkali lye deposit groove connects reaction tank through adding alkali pump, the microcosmic salt chemical feed pipe of microcosmic salt deposit groove connects reaction tank through microcosmic salt volume pump, and the magnesium salts chemical feed pipe of magnesium salts deposit groove connects reaction tank through magnesium salts volume pump.
Reaction tank is columnar vertical pool wall, mechanical stirrer is installed on pool wall top, wherein be connected to crystal collection bucket bottom pool wall, crystal collection bucket side is connected to rising pipe, rising pipe is provided with water discharge valve, the outlet of crystal collection bucket connects shore pipe, and mud valve installed by shore pipe, and described sewage water inlet pipe, alkali lye chemical feed pipe, microcosmic salt chemical feed pipe and magnesium salts chemical feed pipe are stretched into by vertical lip respectively.
Contriver has carried out careful MAP precipitin reaction research by the struvite precipitator method to Nitrogen-and Phosphorus-containing waste water such as breeding wastewater, anaerobic sludge digestion liquid.Phenomenon in reaction process shows, MAP precipitin reaction can occur at normal temperatures and pressures and react very rapid, and the General reactions time can complete according to the water yield and not coexisting of stir speed (S.S.) for 2-10 minute, and struvite precipitation is fast, forms supernatant liquor comparatively limpid.Therefore when selective precipitation reactive mode, the employing intermittent reaction mode in the utility model.
Secondly research shows by experiment, and supernatants after precipitation always part is residual in the reactor, precipitates mixing be difficult to be separated with MAP.Because MAP crystal, at 50 ° of C, decomposition reaction occurs when carrying out drying to precipitated product, therefore bake out temperature should control at 40 ° of about C, because moisture mass percent in throw out often reaches more than 5%, dry struvite product need for up to more than 48 hours.This phenomenon becomes a great problem limiting this engineering practice application.In the utility model, design have employed cone struvite crystals collecting mechanism, cone has and necessarily designs inclination angle, side and be wound around by PVC heater wire and cover polypropylene fibre anti-seepage geotextile, because gravity and density difference principle are separated rapidly after interaction with the target molecules after struvite precipitation is poured over its surface with debris, crystal grain is trapped within polypropylene fibre anti-seepage geotextile, and remaining liquid flows into raffinate receiving tank along polypropylene fibre anti-seepage geotextile.In the utility model, XRD is carried out to struvite precipitated product and detected analysis (X-ray diffraction analysis) and sem analysis (electronic scanning electronic microscope photos), result shows that sedimentary principal constituent is MAP crystalline deposit, deposition condition be pH value 9.0, P/Mg/N mol ratio be respectively 1/1/5,1/1.4/5 and 1/1/1.2 time, sedimentation time is 3 hours, MAP crystallisate content reaches 77.7%-93%.
The characteristic that the utility model needs cryodrying condition to reclaim for struvite product in waste water, by cone, polypropylene fibre anti-seepage geotextile and PVC heating wire being combined at this collecting mechanism, makes struvite throw out mud-water separation efficiency high, effective; By PVC heating wire, 40 degree of dryings are heated to struvite crystals, greatly shorten the time that drying process obtains MAP crystalline deposit, the struvite dried recovered time is made to shorten to 3-5 hour by original more than 48 hours, and the dry electric energy expended of struvite can be reduced significantly, energy efficient about 90%, and achieve smoothly be separated with dry collect integrated.With existing equipment for separating liquid from solid as compared with pressure filter, Mud Sepa Machine, device makes material and to be easy to get and cheap, and cost is low, and structure is simple, and especially separating effect is remarkable, is separated post-heating design and directly dries struvite and obtain finished product slow-release fertilizer.The industrial applications that the utility model can carry out resource utilization recovery for nitrogen and phosphorus pollutants in waste water lays the foundation.
Accompanying drawing explanation
Fig. 1 is structure iron of the present utility model.
Fig. 2 is the sectional view of struvite crystals collecting mechanism of the present utility model.
Fig. 3 is the vertical view of Fig. 2.
Fig. 4 is the enlarged view of part A in Fig. 2.
Embodiment
Referring to figs. 1 through Fig. 4, a kind of device waste water nitrogen phosphorus being carried out to the recovery of struvite resource utilization that the utility model provides, comprise struvite reaction unit, struvite crystals collecting mechanism 2 is provided with below the shore pipe 24 of struvite reaction unit exports, the entirety of this struvite crystals collecting mechanism 2 is inclination angle 25o and cone angle cone-shaped body upwards, the cone angle of cone-shaped body is corresponding with shore pipe 24 export center of struvite reaction unit, surface coverage one deck taper polypropylene fibre anti-seepage geotextile 31 of this cone-shaped body, between polypropylene fibre anti-seepage geotextile 31 and cone-shaped body surface, compact winding has PVC heating wire 28, the periphery, bottom of this cone-shaped body is provided with remaining liquid baffle plate 26, remaining liquid baffle plate 26 is connected to remaining liquid receiving tank 29.The skeleton of this cone-shaped body is made up of equally distributed many metal manifold 27, and many metal manifold 27 upper ends are separately fixed at together, and lower end is separately fixed on base plate 30.The quantity of metal manifold 27 can be determined according to the size of struvite crystals collecting mechanism 2, and what show in Fig. 3 is 10.
Struvite reaction unit lays in groove 8 by reaction tank 1, alkali lye, groove 9 laid in by microcosmic salt and magnesium salts deposit groove 11 forms, wherein, the sewage water inlet pipe 19 of reaction tank 1 connects reaction tank 1 through sewage pump 13, the alkali lye chemical feed pipe 20 of alkali lye deposit groove 8 connects reaction tank 1 through adding alkali pump 7, the microcosmic salt chemical feed pipe 17 of microcosmic salt deposit groove 9 connects reaction tank 1 through microcosmic salt volume pump 10, and the magnesium salts chemical feed pipe 18 of magnesium salts deposit groove 11 connects reaction tank 1 through magnesium salts volume pump 12.
Reaction tank 1 is columnar vertical pool wall 15, mechanical stirrer 3 is installed on pool wall 15 top, the tube wall of columnar three-dimensional pool wall 15 arranges pH probe 5 and connects with pH controller 6, pH controller 6 with add alkali pump and be connected, be connected with crystal collection bucket 23 again through base slope face, pond 21 bottom pool wall 15, crystal collection bucket 23 side is connected to rising pipe 14, rising pipe 14 is provided with water discharge valve 22, the outlet of crystal collection bucket 23 connects shore pipe 24, mud valve 25 installed by shore pipe, described sewage water inlet pipe 19, alkali lye chemical feed pipe 20, microcosmic salt chemical feed pipe 17 and magnesium salts chemical feed pipe 18 are stretched into by three-dimensional pool wall 15 top respectively.Agitator 3 is made up of transmission rig 16, stir shaft and stirring arm 4.
application examples 1:
Reaction tank 1 diameter is about 30cm, high 60cm(does not comprise tapered section at the bottom of pond), useful volume 42L, flooding velocity 180L/h, struvite crystals collecting mechanism 2 height about 10cm, then be 880.6mg/L by ammonia nitrogen concentration, the livestock breeding wastewater of dissolved phosphorus concentration 56.1mg/L, COD concentration 4381.7 mg/L adds intermediate reaction pond 1 by nitrogen-phosphorus wastewater water inlet pipe 19, by microcosmic salt volume pump 10, magnesium salts volume pump 12, microcosmic salt is laid in 4.8% Na in groove 9, magnesium salts deposit groove 10 simultaneously
3pO
4solution and 17% MgCl
2solution together adds in three-dimensional cylindrical shell reaction tank 1, control Na
3pO
4solution flow 26L/h, MgCl
2solution flow 9.4L/h, regulates water inlet PO
4 3--P/Mg
2+/ NH
4 +-N mol ratio is 1/1/1.2; PH controller 6 controls to add alkali pump 7 by pH probe 5 in reaction tank 1 and alkali lye is laid in 2.5 mol/L NaOH alkali lye in groove 8 enters reaction tank 1 through alkali lye chemical feed pipe 20, makes waste water ph about 8.5 ~ 9.0 in reaction tank 1; Outlet valve 22, mud valve 25 is closed during water inlet, open microcosmic salt volume pump 10, magnesium salts volume pump 12, Nitrogen-and Phosphorus-containing sewage pump 13 and pH Controlling System, after phosphorus solution, magnesium solution, sewage, alkali lye enter reaction zone 1, start agitator 3 and stir, struvite crystals particle agglomeration, growth; Rear stopping of having intake water inlet and dosing, leave standstill 3 hours; Owing to generating that struvite crystals density and particle diameter are comparatively large and flow velocity is slower, crystal grain sinks down into base slope face, pond 21 and is collected in crystal collection bucket 23, then open outlet valve 22 supernatants after precipitation is discharged, open mud valve 25 again and discharge the mud mixture precipitated containing struvite, mud mixture falls into struvite crystals collecting mechanism 2 surface through shore pipe 24, closedown mud valve 25 after spoil disposal completes; Collect and drying unit cone diameter 36cm, polypropylene fibre anti-seepage geotextile 26 area is about 0.12m
2, PVC heating wire length is 17 m; Because precipitation collection device 2 cone-shaped body has certain inclination angle, struvite crystals and water are separated rapidly after interaction with the target molecules on its surface, crystal grain is trapped within polypropylene fibre anti-seepage geotextile 26 and is dried by PVC heating wire 31 heating, and the temperature of heating is 40oC; Remaining liquid flows down along taper polypropylene fibre anti-seepage geotextile 26, discharges after remaining liquid collection tube 27 collects.In supernatant liquor in reactor after struvite precipitation, ammonia nitrogen, dissolved phosphorus, COD concentration are 158.5 mg/L, 64.3 mg/L, 3214.6 mg/L respectively.Struvite is detected and analyzes its purity 92.1%.
application examples 2:
Reaction tank 1 diameter is about 60cm, high 120cm(does not comprise tapered section at the bottom of pond), useful volume 85L, discharge is about 360L/h, taper struvite crystals collecting mechanism 2 height about 10cm, then be 791.2mg/L by ammonia nitrogen concentration, the livestock breeding wastewater of dissolved phosphorus concentration 76.1mg/L, COD concentration 5183.4 mg/L adds reaction tank 1 by nitrogen phosphorus waste water lifting pump 13, by microcosmic salt volume pump 10, magnesium salts volume pump 12, microcosmic salt is laid in 4.8% Na in groove 9, magnesium salts deposit groove 10 simultaneously
3pO
4solution and 17% MgCl
2solution together adds reaction tank 1, control Na
3pO
4solution flow 50L/h, MgCl
2solution flow 18L/h, regulates water inlet PO
4 3--P/Mg
2+/ NH
4 +-N mol ratio is 1/1/1.2; PH controller 6 controls to add alkali pump 7 by pH probe 5 in reaction tank 1 and alkali lye is laid in 2.5 mol/L NaOH alkali lye in groove 8 enters reaction tank 1 through alkali lye chemical feed pipe 20, makes waste water ph in reaction tank 1 be about 8.5-9.0; Outlet valve 22, mud valve 25 is closed during water inlet, open microcosmic salt volume pump 10, magnesium salts volume pump 12, Nitrogen-and Phosphorus-containing sewage pump 13 and pH Controlling System, after phosphorus solution, magnesium solution, sewage, alkali lye enter intermediate reaction pond 1, start agitator 3 to stir, struvite crystals particle agglomeration, growth; To intake rear closedown water intaking valve, dosing valve, left standstill 3 hours; Due to generation struvite crystals density, particle diameter is comparatively large and flow velocity is slower, crystal grain sinks down into base slope face, pond 21 and is collected in crystal collection bucket 23, then open outlet valve 22 supernatants after precipitation is discharged, open mud valve 25 again and discharge the mud mixture precipitated containing struvite, mud mixture falls into struvite crystals collecting mechanism 2 surface through shore pipe 24, closedown mud valve 25 after spoil disposal completes; Collect and drying unit cone diameter 72cm, polypropylene fibre anti-seepage geotextile 26 area is about 0.45m
2, PVC heating wire length is 75 m; Because precipitation collection device 2 cone has certain inclination angle, struvite crystals and water are separated rapidly after interaction with the target molecules on its surface, crystal grain is trapped within coarse polypropylene fibre anti-seepage geotextile 26 and is dried by PVC heating wire 31 heating, and the temperature of heating is 40oC; Remaining liquid flows down along the coarse polypropylene fibre anti-seepage geotextile 26 of taper, discharges after remaining liquid collection tube 27 collects.In reactor, in struvite supernatants after precipitation, ammonia nitrogen, dissolved phosphorus, COD concentration are 140.1 mg/L, 59.3 mg/L, 4074.2 mg/L respectively.Struvite is detected and analyzes its purity 91.7%.
Claims (6)
1. one kind is carried out the device of struvite resource utilization recovery to waste water nitrogen phosphorus, comprise struvite reaction unit, it is characterized in that, struvite crystals collecting mechanism (2) is provided with below shore pipe (24) outlet of struvite reaction unit, the entirety of this struvite crystals collecting mechanism (2) is inclination angle 20 ~ 30o and cone angle cone-shaped body upwards, the cone angle of cone-shaped body is corresponding with shore pipe (24) export center of struvite reaction unit, surface coverage one deck taper polypropylene fibre anti-seepage geotextile (31) of this cone-shaped body, between polypropylene fibre anti-seepage geotextile (31) and cone-shaped body surface, compact winding has PVC heating wire (28), the periphery, bottom of this cone-shaped body is provided with remaining liquid baffle plate (26), remaining liquid baffle plate (26) is connected to remaining liquid receiving tank (29).
2. a kind of device waste water nitrogen phosphorus being carried out to the recovery of struvite resource utilization according to claim 1, it is characterized in that, the skeleton of this cone-shaped body is made up of equally distributed many metal manifold (27), many metal manifold (27) upper ends are separately fixed at together, and lower end is separately fixed on base plate (30).
3. a kind of device struvite crystalline deposit thing being carried out to Separation and Recovery according to claim 1, it is characterized in that, struvite reaction unit is by reaction tank (1), alkali lye deposit groove (8), microcosmic salt deposit groove (9) and magnesium salts deposit groove (11) composition, wherein, the sewage water inlet pipe (19) of reaction tank (1) connects reaction tank (1) through sewage pump (13), the alkali lye chemical feed pipe (20) of alkali lye deposit groove (8) connects reaction tank (1) through adding alkali pump (7), the microcosmic salt chemical feed pipe (17) of microcosmic salt deposit groove (9) connects reaction tank (1) through microcosmic salt volume pump (10), the magnesium salts chemical feed pipe (18) of magnesium salts deposit groove (11) connects reaction tank (1) through magnesium salts volume pump (12).
4. a kind of device struvite crystalline deposit thing being carried out to Separation and Recovery according to claim 3, it is characterized in that, reaction tank (1) is columnar vertical pool wall (15), mechanical stirrer (3) is installed on pool wall (15) top, crystal collection bucket (23) is connected to bottom pool wall, crystal collection bucket (23) side is connected to rising pipe (14), rising pipe (14) is provided with water discharge valve (22), the outlet of crystal collection bucket (23) connects shore pipe (24), mud valve (25) installed by shore pipe (24), described sewage water inlet pipe (19), alkali lye chemical feed pipe (20), microcosmic salt chemical feed pipe (17) and magnesium salts chemical feed pipe (18) are stretched into by reaction tank (1) top respectively.
5. a kind of device struvite crystalline deposit thing being carried out to Separation and Recovery according to claim 4, is characterized in that, be connected bottom pool wall through base slope face, pond (21) with crystal collection bucket (23) again.
6. a kind of device struvite crystalline deposit thing being carried out to Separation and Recovery according to claim 4, is characterized in that, the pool wall of reaction tank (1) arranges pH probe (5) and connects with pH controller (6), pH controller (6) with add alkali pump (7) and be connected.
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|---|---|---|---|
| CN201420458242.0U CN204125171U (en) | 2014-08-14 | 2014-08-14 | A kind of device waste water nitrogen phosphorus being carried out to the recovery of struvite resource utilization |
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|---|---|---|---|
| CN201420458242.0U CN204125171U (en) | 2014-08-14 | 2014-08-14 | A kind of device waste water nitrogen phosphorus being carried out to the recovery of struvite resource utilization |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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2014
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150128 Termination date: 20150814 |
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| EXPY | Termination of patent right or utility model |