CN109809631A - A method and system for improving phosphorus recovery efficiency of biogas slurry in pig farms - Google Patents
A method and system for improving phosphorus recovery efficiency of biogas slurry in pig farms Download PDFInfo
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- CN109809631A CN109809631A CN201910098777.9A CN201910098777A CN109809631A CN 109809631 A CN109809631 A CN 109809631A CN 201910098777 A CN201910098777 A CN 201910098777A CN 109809631 A CN109809631 A CN 109809631A
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 64
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 61
- 239000011574 phosphorus Substances 0.000 title claims abstract description 61
- 239000002002 slurry Substances 0.000 title claims abstract description 47
- 238000011084 recovery Methods 0.000 title claims abstract description 43
- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000006228 supernatant Substances 0.000 claims abstract description 26
- 238000005273 aeration Methods 0.000 claims abstract description 25
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 claims abstract description 21
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000011777 magnesium Substances 0.000 claims abstract description 16
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 16
- 239000002699 waste material Substances 0.000 claims abstract description 13
- 239000000395 magnesium oxide Substances 0.000 claims abstract description 12
- 239000002244 precipitate Substances 0.000 claims abstract description 9
- 238000001556 precipitation Methods 0.000 claims abstract description 8
- 239000000047 product Substances 0.000 claims abstract description 8
- 239000013049 sediment Substances 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims abstract description 5
- 239000002686 phosphate fertilizer Substances 0.000 claims abstract description 5
- 241000282898 Sus scrofa Species 0.000 claims description 46
- 239000010802 sludge Substances 0.000 claims description 22
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- 239000007788 liquid Substances 0.000 claims description 11
- 239000000243 solution Substances 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 3
- 238000010248 power generation Methods 0.000 claims description 3
- 239000013078 crystal Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 238000009210 therapy by ultrasound Methods 0.000 claims description 2
- 239000012670 alkaline solution Substances 0.000 claims 3
- 238000006477 desulfuration reaction Methods 0.000 claims 2
- 230000023556 desulfurization Effects 0.000 claims 2
- AXZKOIWUVFPNLO-UHFFFAOYSA-N magnesium;oxygen(2-) Chemical compound [O-2].[Mg+2] AXZKOIWUVFPNLO-UHFFFAOYSA-N 0.000 claims 2
- 239000012528 membrane Substances 0.000 claims 1
- 239000011259 mixed solution Substances 0.000 claims 1
- 238000012545 processing Methods 0.000 abstract description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 12
- 230000000694 effects Effects 0.000 abstract description 8
- 239000011148 porous material Substances 0.000 abstract description 7
- 229910019142 PO4 Inorganic materials 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000002604 ultrasonography Methods 0.000 description 23
- 239000002351 wastewater Substances 0.000 description 11
- 230000029087 digestion Effects 0.000 description 7
- 238000004064 recycling Methods 0.000 description 7
- 229910052567 struvite Inorganic materials 0.000 description 6
- 238000002425 crystallisation Methods 0.000 description 5
- 230000008025 crystallization Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000000654 additive Substances 0.000 description 4
- 230000000996 additive effect Effects 0.000 description 4
- CKMXBZGNNVIXHC-UHFFFAOYSA-L ammonium magnesium phosphate hexahydrate Chemical compound [NH4+].O.O.O.O.O.O.[Mg+2].[O-]P([O-])([O-])=O CKMXBZGNNVIXHC-UHFFFAOYSA-L 0.000 description 4
- CSNNHWWHGAXBCP-UHFFFAOYSA-L magnesium sulphate Substances [Mg+2].[O-][S+2]([O-])([O-])[O-] CSNNHWWHGAXBCP-UHFFFAOYSA-L 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 4
- 230000001376 precipitating effect Effects 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000007789 gas Substances 0.000 description 3
- 229910052943 magnesium sulfate Inorganic materials 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- SVFOMDDAWOLOME-UHFFFAOYSA-N [N].[Mg] Chemical compound [N].[Mg] SVFOMDDAWOLOME-UHFFFAOYSA-N 0.000 description 2
- 238000007792 addition Methods 0.000 description 2
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 description 2
- MXZRMHIULZDAKC-UHFFFAOYSA-L ammonium magnesium phosphate Chemical compound [NH4+].[Mg+2].[O-]P([O-])([O-])=O MXZRMHIULZDAKC-UHFFFAOYSA-L 0.000 description 2
- 210000004027 cell Anatomy 0.000 description 2
- 239000003153 chemical reaction reagent Substances 0.000 description 2
- 230000018044 dehydration Effects 0.000 description 2
- 238000006297 dehydration reaction Methods 0.000 description 2
- 230000003834 intracellular effect Effects 0.000 description 2
- 239000001095 magnesium carbonate Substances 0.000 description 2
- 235000014380 magnesium carbonate Nutrition 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000012856 packing Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- YUWBVKYVJWNVLE-UHFFFAOYSA-N [N].[P] Chemical compound [N].[P] YUWBVKYVJWNVLE-UHFFFAOYSA-N 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000012267 brine Substances 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 229940079593 drug Drugs 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- BHEPBYXIRTUNPN-UHFFFAOYSA-N hydridophosphorus(.) (triplet) Chemical compound [PH] BHEPBYXIRTUNPN-UHFFFAOYSA-N 0.000 description 1
- 239000003446 ligand Substances 0.000 description 1
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L magnesium chloride Substances [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 description 1
- 229910001629 magnesium chloride Inorganic materials 0.000 description 1
- 238000003760 magnetic stirring Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000029052 metamorphosis Effects 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000010452 phosphate Substances 0.000 description 1
- 150000003904 phospholipids Chemical class 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- HPALAKNZSZLMCH-UHFFFAOYSA-M sodium;chloride;hydrate Chemical compound O.[Na+].[Cl-] HPALAKNZSZLMCH-UHFFFAOYSA-M 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000007790 solid phase Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000005979 thermal decomposition reaction Methods 0.000 description 1
- 238000002525 ultrasonication Methods 0.000 description 1
Landscapes
- Treatment Of Sludge (AREA)
Abstract
The invention belongs to nutriment recovery technology fields in Stock raising waste, disclose a kind of method and its system for improving pig farm biogas slurry phosphorus recovery efficiency.Pig farm biogas slurry containing biogas residue is pumped into ultrasonic pretreatment pool by this method, is ultrasonically treated under stirring to pig farm biogas slurry and biogas residue mixed liquor, is obtained supernatant A and sediment A；Supernatant A is pumped into MAP processing pond, is aerated by the micro-pore aeration pipeline of bottom, adds magnesia FGD waste residue as magnesium source, and pH to 9.5~10 is adjusted by aqueous slkali, after aeration, MAP precipitation reaction is carried out, obtains supernatant B and sediment B；Supernatant B is pumped into the water inlet that subsequent biochemical pond is handled as subsequent biochemical, MAP is pumped into after crystalline deposit and precipitates dry pond, by biological dewatered, product can make MAP phosphate fertilizer product.This method releases phosphorus effect and improves 109.31%；PO4 3‑For-P the rate of recovery up to 98.9%, the recovering effect of phosphorus is obvious, has a extensive future.
Description
Technical field
The invention belongs to nutriment recovery technology fields in Stock raising waste, more particularly, to a kind of raising pig
The method and its system of field biogas slurry phosphorus recovery efficiency.
Background technique
Phosphor resource can be exploited on the earth to gradually decrease, a large amount of phosphorus and nitrogen are contained in the biogas slurry of pig farm, while being also dirt
Contaminate element.Therefore, piggery wastewater nitrogen phosphorus ligands and recovery technology is studied to recycle with dual environmental protection and recycling
Meaning.
Currently, magnesium ammonium phosphate sediment method is considered as most promising phosphorus recovery process, because while going dephosphorization, also
Generate a kind of valuable slow release fertilizer struvite crystallization.Domestic external application magnesium ammonium phosphate sediment method recycles phosphorus from the biogas slurry of pig farm
Correlative study has had very much, wherein Song et al (Nutrients removal and recovery from
anaerobically digested swine wastewater by struvite crystallization without
Chemical additions) research in, phosphorus recovery efficiency be 85%；Liu et al(Recovery of nitrogen
Andphosphorus by struvite crystallization from swine wastewater) recovery efficiency is
65%；Ichihashi and Hirooka (Removal and recovery of phosphorus as struvite from
Swine wastewater using microbial fuel cell) research be also in 79-82%, these research in all only
It is the phosphorus being utilized in biogas slurry supernatant, there is no the phosphorus in biogas residue is used, causes biogas slurry phosphorus recovery utilization rate inclined
It is low, and usually adjust pH value in test by addition NaOH and use MgCl2And MgSO4Deng these pure chemistry drug conducts
Magnesium source limits the practical application of MAP technique to cause phosphorus cost recovery high.
Ultrasonic wave is that one kind can generate acoustic cavitation in water, forms the auxiliary skill of high shear Yu Shuizhong substance
Art is usually applied to the minimizing of excess sludge.Correlative study, which shows to be ultrasonically treated, can effectively destroy sludge knot
Structure discharges substance intracellular and extracellular, so that phosphate be made to release from solid phase.But applications of ultrasound (contains natural pond in pig farm biogas slurry
Slag sludge) in so that biogas residue is discharged more phosphorus into supernatant to enhance phosphorus recycling, all without relevant report in foreign study；
In the selection in magnesium source, researcher also have found it is some low-grade containing magnesium material, such as magnesite thermal decomposition product, brine, seawater NF
Concentrate, magnesite, magnesia etc., but these magnesium source substitutes will appear various problems during operation, such as more
More solid residue, new ionic soil, Mg2+Content is more low.Magnesia FGD waste residue (MDWR) derives from coal-burning power plant's cigarette
Gas magnesia FGD technique is to be landfilled or topple over as solid waste, but its main component is MgSO now3And MgSO4, it is
A kind of good magnesium source for phosphorus recycling.Wherein our team middle forests are shining good just once pre- for ammonia nitrogen removal using MDWR as magnesium source
Processing, ammonia nitrogen removal frank can reach 60%, and chemical cost saves 29.17%, and effect is fine, but not appear in the newspapers for phosphorus recycling
Road.Therefore, selecting MDWR that can either provide a large amount of magnesium sources as magnesium source reduces cost, and can prevent MDWR secondary pollution, gives up
Object utilizes.
Summary of the invention
In order to solve above-mentioned the shortcomings of the prior art and disadvantage, the primary purpose of the present invention is that providing a kind of raising
The method of pig farm biogas slurry phosphorus recovery efficiency, this method release the phosphorus in biogas residue using ultrasonic pretreatment, use magnesia
Desuifurized (MDWR) is used as magnesium source, and by aeration, improves its pH value, reduces the dosage of aqueous slkali, carries out MAP and reacts back
Receive the phosphor resource in biogas slurry.Main purpose is to improve the rate of recovery of pig farm biogas slurry phosphorus, reduces phosphorus recovery process cost, is MAP
Technique practical application provides a kind of economically feasible low cost innovation novel process.
Another object of the present invention is to provide the systems for the method for realizing above-mentioned raising pig farm biogas slurry phosphorus recovery efficiency.
The purpose of the present invention is realized by following technical proposals:
A method of improving pig farm biogas slurry phosphorus recovery efficiency, comprising the following steps:
S1. the pig farm biogas slurry containing biogas residue is pumped into ultrasonic pretreatment pool, it is mixed to pig farm biogas slurry and biogas residue under stirring
It closes liquid to be ultrasonically treated, obtains supernatant A and sediment A；
S2. the resulting supernatant A of step S1 is pumped into MAP processing pond, is exposed by the micro-pore aeration pipeline of bottom
Gas adds magnesia FGD waste residue as magnesium source, and adjusts pH to 9.5~10 by aqueous slkali, after aeration, carries out MAP
Precipitation reaction obtains supernatant B and sediment B；
S3. the resulting supernatant B of step S2 is pumped into the water inlet that subsequent biochemical pond is handled as subsequent biochemical, crystalline deposit
Object B is pumped into MAP and precipitates dry pond, and by biological dewatered, product can make MAP phosphate fertilizer product.
Preferably, acoustic density ultrasonic described in step S1 is 1000~1200WL-1, the time of the ultrasound is 80
~85min.
Preferably, aqueous slkali described in step S2 is NaOH solution or Ca (OH)2Solution；The mass concentration of the aqueous slkali
It is 20~25%.
Preferably, the time of aeration described in step S2 is 2~2.5h.
Preferably, the volume ratio of the quality and supernatant A of magnesia FGD waste residue described in step S2 is (0.08~0.1)
G:1L.
The system of the recovery method of the raising pig farm biogas slurry phosphorus recovery efficiency, the system successively include ultrasonic pre- place
It manages pond, MAP processing pond and MAP and precipitates dry pond.
Further, the ultrasonic pretreatment pool includes ultrasound pretreatment pond body, above the ultrasound pretreatment pond body
It is provided with Vltrasonic device；Draining pump and drainpipe, the drainpipe and draining are provided with above the ultrasound pretreatment pond body
Pump is connected；The bottom of the ultrasound pretreatment pond body is provided with blender control mixed liquor stirring；The ultrasound pretreatment
The bottom of pond body is provided with sludge pipe, and the sludge pipe is controlled by the sludge pump.
Further, the MAP processing pond includes MAP treatment tank body, and water is strained in setting in the MAP treatment tank body
Device is provided with micro-pore aeration pipeline below the water decanter, and the bottom of the MAP treatment tank body is provided with sludge pipe, institute
It states sludge pipe to be controlled by sludge pump, the external MAP of sludge pipe precipitates dry pond and collects MAP crystalline deposit.
Further, the electricity consumption of the Vltrasonic device, draining pump, sludge pump, blender is all made of black film natural pond inside pig farm
Marsh gas power generation provides in gas pond.
Piggery wastewater tradition phosphorus recovery process mainly uses phosphorus in MAP method recycling supernatant, and to a large amount of in biogas residue
Phosphorus is unutilized, causes phosphorous recovery low；The present invention discharges phosphorus with ultrasonic pretreatment biogas residue, utilizes magnesia FGD waste residue
(MDWR) as inexpensive magnesium source, CO is removed by aeration stripping2System pH is improved, NaOH dosage is reduced.It is pre- using ultrasound
It handles biogas residue and discharges phosphorus, and MAP is carried out to pig farm biogas slurry by being aerated and adding magnesia FGD waste residue as inexpensive magnesium source
Processing recycling phosphorus.Illustrate in New Phosphorus recovery process, pig farm biogas slurry can recycle to greatest extent after ultrasonic pretreatment
Phosphorus in waste water, at the same it is low using MDWR processing cost, when the pig farm biogas slurry containing biogas residue is pumped into ultrasonic pretreatment pool ultrasonic
Between be 80min, acoustic density 1000WL-1Ultrasonic pretreatment is carried out, releasing phosphorus effect can be improved 109.31%；Then supernatant
It is pumped into MAP processing pond again, in MDWR additive amount 0.08gL-1, pH value 9.5 carries out at MAP under conditions of aeration time 2h
Reason, PO4 3-For-P the rate of recovery up to 98.90%, the recovering effect of phosphorus is obvious.Illustrate in New Phosphorus recovery process, pig farm biogas slurry warp
The phosphorus in waste water can be recycled after ultrasonic pretreatment to greatest extent, while low using MDWR processing cost, waste is comprehensive again
It utilizes, has a extensive future.
Compared with prior art, the invention has the following advantages:
1. the present invention is pre-processed pig farm biogas slurry (contain biogas residue) by ultrasound, the flocculation structure of ultrasonication biogas residue and extracellular poly-
Object is closed, PO is released4 3-- P, while keeping cell wall broken, the phosphorus in intracellular organic matter and phospholipid bilayer is released.It is maximum
Promote to limit the water-soluble phosphorus in biogas residue to discharge, entered in liquid from solid, is recycled convenient for subsequent MAP phosphorus.
2. the present invention not only increases the rate of recovery of pig farm biogas slurry phosphorus, while reducing phosphorus recovery process cost, phosphorus effect is released
Fruit improves 109.31%；PO4 3-For-P the rate of recovery up to 98.9%, the recovering effect of phosphorus is obvious, provides for MAP technique practical application
A kind of economically feasible low cost innovation novel process.
3. the present invention passes through using rich in MgSO3And MgSO4Magnesia FGD waste residue as MAP phosphorus recovery processing in
Magnesium source, can either provide a large amount of magnesium sources reduces processing cost, and can prevent MDWR secondary pollution, waste utilization.
4. present system removes CO by aeration stripping2Improve system pH, reduce NaOH dosage, reduce operation at
Sheet and cost of investment.
Detailed description of the invention
Fig. 1 is the novel recovery process flow chart that the present invention improves pig farm biogas slurry phosphorus recovery efficiency.
Fig. 2 is ultrasonic pretreatment pool schematic diagram.
Fig. 3 is MAP processing pond schematic diagram.
Fig. 4 is that MAP precipitates dry pond schematic diagram.
Specific embodiment
The contents of the present invention are further illustrated combined with specific embodiments below, but should not be construed as limiting the invention.
Unless otherwise specified, the conventional means that technological means used in embodiment is well known to those skilled in the art.Except non-specifically
Illustrate, reagent that the present invention uses, method and apparatus is the art conventional reagents, method and apparatus.
Embodiment 1
The present invention is as shown in Figure 1, handle back biogas slurry (containing biogas residue) progress pre-treatment and MAP precipitated crystal using ultrasound
The system for receiving phosphor resource in digester of pig farm water outlet, successively includes ultrasonic pretreatment pool, and MAP processing pond and MAP precipitate dry pond.
Fig. 2 is ultrasonic pretreatment pool schematic diagram.Wherein, ultrasound pretreatment pond body 1, sludge pump 2, sludge pipe 3, Vltrasonic device
4, draining pump 5, blender 6, drainpipe 7.Ultrasonic pretreatment pool includes ultrasound pretreatment pond body 1, the ultrasonic pretreatment pool
Vltrasonic device 4 is provided with above body 1；Draining pump 5 and drainpipe 7, drainpipe are provided with above the ultrasound pretreatment pond body 1
7 are connected with draining pump 5；The bottom of the ultrasound pretreatment pond body 1 is provided with blender 6 and controls mixed liquor stirring；Described
The bottom of ultrasound pretreatment pond body 1 is provided with sludge pipe 3, and the sludge pipe 3 is controlled by sludge pump 2.
Fig. 3 is MAP processing pond schematic diagram.Wherein, MAP treatment tank body 8, micro-pore aeration pipeline 9, water decanter 10, drainpipe
11, sludge pump 12, sludge pipe 13.The MAP processing pond includes MAP treatment tank body 8, setting in the MAP treatment tank body 8
Water decanter 10, the lower section of the water decanter 10 are provided with micro-pore aeration pipeline 9, and the bottom of MAP treatment tank body 8 is provided with spoil disposal
Pipe 13, sludge pipe 13 are controlled by sludge pump 12, and the external MAP of sludge pipe 13 precipitates dry pond 14 and collects MAP crystalline deposit.Wherein,
The electricity consumption of ultrasonic pre- ultrasonic device and other all electrical equipments all uses marsh gas power generation offer in black film methane-generating pit inside pig farm.
Embodiment 2
1. processing: pig farm biogas slurry (containing biogas residue) being passed through in ultrasonic pretreatment pool, opening bottom stirrer makes biogas slurry and biogas residue
It is uniformly mixed, the Vltrasonic device being then turned on above pond body, setting ultrasound condition is acoustic density 1000WL-1, ultrasonic time
80min。
2. preaeration: after ultrasound pretreatment, supernatant enters in MAP processing pond, and MAP handles bottom of pond portion and installs micro-pore aeration
Pipeline improves wastewater pH by aeration.
3. adding MDWR: carrying out adding MDWR in pond, additive amount is set as 0.08gL-1.MDWR is solid, passes through people
Work adds.
4. adjusting pH: adding liquid alkaline (20% sodium hydroxide) and adjust pH to 9.5, liquid alkaline is stored in polyethylene tank, passes through pump
It adds into processing pond.
5.MAP processing: it after aeration 2h, staticly settles, recycles phosphorus in biogas slurry.Processed waste water clear liquid is pumped into subsequent
In biochemical treatment, MAP crystalline deposit is expelled to the dry pond of precipitating from lower part.
6. precipitation process: after the precipitating discharge of MAP processing, carrying out dehydration and drying packing, can be used as and secure nitrogen magnesium elements
More high-grade MAP phosphate fertilizer sell.
Embodiment 3
1. processing: pig farm biogas slurry (containing biogas residue) being passed through in ultrasonic pretreatment pool, opening bottom stirrer makes biogas slurry and biogas residue
It is uniformly mixed, the Vltrasonic device being then turned on above pond body, setting ultrasound condition is acoustic density 1200WL-1, ultrasonic time
85min。
2. preaeration: after ultrasound pretreatment, supernatant enters in MAP processing pond, and MAP handles bottom of pond portion and installs micro-pore aeration
Pipeline improves wastewater pH by aeration.
3. adding MDWR: carrying out adding MDWR in pond, additive amount is set as 0.1gL-1.MDWR is solid, passes through people
Work adds.
4. adjusting pH: adding 25%Ca (OH)2PH to 10 is adjusted, liquid alkaline is stored in polyethylene tank, adds by pump into place
Manage pond.
5.MAP processing: it after aeration 2.5h, staticly settles, recycles phosphorus in biogas slurry.After processed waste water clear liquid is pumped into
In continuous biochemical treatment, MAP crystalline deposit is expelled to the dry pond of precipitating from lower part.
6. precipitation process: after the precipitating discharge of MAP processing, carrying out dehydration and drying packing, can be used as and secure nitrogen magnesium elements
More high-grade MAP phosphate fertilizer sell.
Embodiment 4
The present invention uses the ultrasonic pretreatment unit and fluidized bed MAP crystallization reactor of autonomous Design, to pig farm biogas slurry phosphorus
The novel process of recycling is simulated.
1. pig farm anaerobic digestion solution is passed through in ultrasonic pre- place's device, biogas slurry is mixed with biogas residue using magnetic stirring apparatus
It is even, it is then turned on Vltrasonic device, Vltrasonic device is using LW92-III type Ultrasonic cell smash (China, Shanghai), frequency 20
~25KHz, maximum power 1000W, luffing shank diameter are 12mm, 10mm under should putting ultrasonic amplitude transformer to liquid when ultrasonic~
20mm.Setting ultrasound condition is acoustic density 1000WL-1, ultrasonic time 80min.
2. the supernatant after ultrasonic treatment is passed through in fluidized bed MAP crystallization reactor, adding MDWR is 0.08gL-1, throw
Liquid feeding alkali (20% sodium hydroxide) adjust reactor pH to 9.5, then by aeration 2h after, staticly settle.Crystallized product is returned
It receives and recycles, be discharged the biochemistry water inlet as next stage.
Supernatant in the anaerobic digestion solution of pig farm, biogas residue and mix biogas slurry water quality parameter it is as shown in table 1, in a manner described into
Row operation, pig farm anaerobic digestion solution is after ultrasound pretreatment, supernatant and biogas residue ultrasound front and back phosphorus in the anaerobic digestion solution of pig farm
Metamorphosis is as shown in table 2.From Tables 1 and 2 it is found that PO in supernatant in the anaerobic digestion solution of pig farm4 3-P content improves
109.31%.It is 80min, acoustic density 1000WL in ultrasonic time-1, MDWR additive amount is 0.8gL-1, reaction is initially
PH value control is run under 9.5, the process conditions that aeration time is 2h, and total phosphorus (TP) content is 4.13mg in filtrate after reaction
L-1, PO4 3-The content of-P is 1.89mgL-1, PO4 3-The rate of recovery of-P reaches 98.90%, NH3The content of-N is 268.22mg
L-1, NH3- N removal rate is 66.84%, as a result illustrates that phosphorus recovering effect is quite obvious.
Supernatant, biogas residue and the water quality parameter for mixing biogas slurry in 1 pig farm anaerobic digestion solution of table
Supernatant and the P form variation of biogas residue ultrasound front and back in 2 pig farm anaerobic digestion solution of table
The above embodiment is a preferred embodiment of the present invention, but embodiments of the present invention are not by above-described embodiment
Limitation, it is other it is any without departing from the spirit and principles of the present invention made by change, modification, substitution, combination and simplify,
It should be equivalent substitute mode, be included within the scope of the present invention.
Claims (10)
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111573648A (en) * | 2020-04-09 | 2020-08-25 | 浙江省天正设计工程有限公司 | Struvite method recycling treatment process for phosphorus and sulfur containing high-concentration organic wastewater |
| CN113072260A (en) * | 2021-04-21 | 2021-07-06 | 成都理工大学 | Treatment method of enhanced nitrogen and phosphorus removal resource recycling pig raising wastewater |
| CN114177885A (en) * | 2021-11-25 | 2022-03-15 | 华南农业大学 | Magnesium-containing biochar liquid material for recovering phosphorus element in pig farm wastewater and preparation method and application thereof |
| CN114685217A (en) * | 2022-03-16 | 2022-07-01 | 华南农业大学 | A method for effectively recovering nutrients from biogas slurry by utilizing biogas residue charcoal containing ash and phosphorus |
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| CN111573648A (en) * | 2020-04-09 | 2020-08-25 | 浙江省天正设计工程有限公司 | Struvite method recycling treatment process for phosphorus and sulfur containing high-concentration organic wastewater |
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| CN114177885A (en) * | 2021-11-25 | 2022-03-15 | 华南农业大学 | Magnesium-containing biochar liquid material for recovering phosphorus element in pig farm wastewater and preparation method and application thereof |
| CN114685217A (en) * | 2022-03-16 | 2022-07-01 | 华南农业大学 | A method for effectively recovering nutrients from biogas slurry by utilizing biogas residue charcoal containing ash and phosphorus |
| CN114904480A (en) * | 2022-05-06 | 2022-08-16 | 华南农业大学 | A method for recovering nitrogen and phosphorus from pig farm biogas slurry to produce MAP carbon-based material |
| CN118420409A (en) * | 2024-04-25 | 2024-08-02 | 生态环境部华南环境科学研究所(生态环境部生态环境应急研究所) | A method for recovering nutrients from biogas slurry by activating anaerobic biogas slag through pyrolysis of alkaline slag |
| CN118459275A (en) * | 2024-04-25 | 2024-08-09 | 生态环境部华南环境科学研究所(生态环境部生态环境应急研究所) | A method for recovering nutrients from biogas slurry by activating low-grade phosphate ore through pyrolysis of alkali residue |
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