CN105540770A - Magnetically induced crystallization method and apparatus for removal and recovery of phosphorus in wastewater - Google Patents
Magnetically induced crystallization method and apparatus for removal and recovery of phosphorus in wastewater Download PDFInfo
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- CN105540770A CN105540770A CN201510951309.3A CN201510951309A CN105540770A CN 105540770 A CN105540770 A CN 105540770A CN 201510951309 A CN201510951309 A CN 201510951309A CN 105540770 A CN105540770 A CN 105540770A
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- magnetic
- sewage
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- phosphorus
- crystallization
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
- C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Water Treatment By Electricity Or Magnetism (AREA)
- Removal Of Specific Substances (AREA)
Abstract
The invention discloses a magnetically induced crystallization method and apparatus for removal and recovery of phosphorus in wastewater. A magnetically induced crystallization reaction apparatus comprises a reactor, a drug restore tank, a water tank and a blower. The reactor comprises a mixing zone, a reaction zone and a settling zone. A flap mixing apparatus is arranged in the mixing zone to lay a good foundation for the induction crystallization reaction; porous alkaline slag rich in Ca<2+> and electrolytic manganese slag are used as a composite induction seed to create a favorable conditions for the induction crystallization reaction; a magnetic field is added, and the magnetic force is favor of OH. generation, thereby promoting crystal growth; and magnetic force and iron in composite seed form a magnetic flocculation effect, thereby improving the separation effect of crystals and water, and improving the efficiency of phosphorus removal. The invention does not change the process of the wastewater treatment plant in the prior art, removes and recycles phosphorus in sludge dewatering filtrate and sludge nitrification liquid, has the advantages of simple equipment, simple operation, and simple control, and is conducive to production implementation.
Description
Technical field
The present invention relates to removal and the recycling of phosphor in sewage, particularly method and the device of phosphorus in sludge dewatering filtrate is removed and is reclaimed in a kind of Magnetic guidance crystallization.
Background technology
Researching and developing new efficient dephosphorization technology is one of study hotspot of current sewage treatment area.In Simultaneous Denitrification and biological phosphate-eliminating sewage biological treatment system, there are carbon source contradiction, mud contradiction in age and nitrate problem etc. in biological denitrificaion and biological phosphate-eliminating, cause the TP of water outlet to be difficult to arrive emission standard usually so simultaneously.Phosphorus is Nonrenewable resources, and in order to utilize by persistent loop, perspective in research has been removed phosphorus to the transformation of removing and reclaiming phosphorus by relevant scholar from sewage both at home and abroad.Therefore, how realizing and to improve the rearmounted endogenous denitrification function in conventional treatment process, is researchist's urgent problem in this area.Therefore, a kind of Magnetic guidance crystallization of the present invention is removed and is reclaimed the method for phosphor in sewage, can on the basis not changing existing sewage work technique, development technology flow process is simple, efficient, stable, in the sludge dewatering filtrate of low cost phosphorus ligands with recycle gordian technique and theory, to improve municipal wastewater treatment plant nitrogen phosphorus processing efficiency, make its qualified discharge, realize the persistent resources of phosphorus and utilize significant.
Summary of the invention
The object of the invention is the deficiency overcome in prior art, there is provided a kind of run control simple, treatment effect is good and the Magnetic guidance crystallization that phosphorus is easy to reclaim is removed and the method for recovery phosphor in sewage and device, is applicable to removal and the recycling of the Phosphorus From Wastewaters such as city domestic sewage, sludge-digestion liquid, dewatered sewage percolate.
Technical scheme of the present invention is achieved in that
Magnetic guidance crystallization is removed and is reclaimed a method for phosphor in sewage, it is characterized in that, comprises the following steps:
After rich phosphorus-containing wastewater mixes with medicament in mixing device, then the phosphorus in sewage forms insoluble crystal in the mode of induced crystallization in the reactor, in settler, rely on gravity to be separated with the effect of magnetic force tiny be rich in phosphorus crystal, thus the phosphorus in removal sewage, the crystal that part is tiny simultaneously comes back in reactor, the formation of favourable induced crystallization.
Further, described rich phosphorus-containing wastewater is carried from water tank by water pump, and pH controls 7.0 ~ 10.2, and hydraulic detention time HRT controls at 1-8h, and gas-water ratio controls in 50 ~ 150(volume ratio).
Further, described medicament is CaCl
2, MgCl
2or both mixing solutionss, be only CaCl
2time Ca/P mol ratio control, 1.2 ~ 3, to be only MgCl
2during medicament, Mg/P mol ratio controls 1.0 ~ 2, and during mixing solutions for both, Ca/P mol ratio controls 0.8 ~ 2.0.
Further, described mixing device is flap mixing device, and the angle between flap is 120 ~ 180 degree.
Further, the device that described induced crystallization adopts is Magnetic guidance crystallization apparatus, and its crystal seed is combination crystal seed, is made up of slag (particle diameter 0.01mm ~ 0.2mm) and electrolytic manganese residues (0.05mm ~ 0.30mm), the mass ratio of slag and electrolytic manganese residues is 0.1 ~ 0.2, and dosage controls at 5 ~ 50g/L.
Further, the magnetic field of described Magnetic guidance crystallization apparatus is standing field, combined by positive pole N and negative pole S magnetic sheet, by the size regulating positive pole N and negative pole S spacing to regulate magnetic field, according to the magnetic induction control of the concentration different magnetic field of phosphorus in water inlet between 30 ~ 150mT.
Another object of the present invention is to provide the device that a kind of Magnetic guidance crystallization is removed and reclaimed phosphor in sewage.
A kind of Magnetic guidance crystallization is removed and is reclaimed the device of phosphor in sewage, comprise reactor, medicine storage pool, water tank and gas blower, reactor connects medicine storage pool by dosing pump, reactor connects water tank by water pump, reactor also connects gas blower, described reactor comprises mixing zone, reaction zone and settling region, and described mixing zone arranges flap mixing device, and described reactor monolith is placed in magnetic field.
Further, described magnetic field is standing field, is combined by positive pole N and negative pole S magnetic sheet, by the size regulating positive pole N and negative pole S spacing to regulate magnetic field.
Further, also comprise controller, described controller is connected with dosing pump, water pump and gas blower respectively.
The principle of work of reinforced phosphor-removing of the present invention: so-called induced crystallization, namely induced crystallization principle and bed process is utilized, by adding crystal seed in reactor, make phosphate compounds crystallization and be deposited on seed surface, have do not produce mud, crystallized product be easy to be separated and purity comparatively advantages of higher.Current fluidized bed reactor and Phosnix reactor also exist that medicament mixed effect is poor, inferior separating effect and the shortcoming such as phosphorus organic efficiency is low, and then have impact on technique out effect.Owing to being provided with unique flap mixing zone in the present invention, greatly strengthen the mixed effect of medicament and former water, for induced crystallization reaction is had laid a good foundation.Then, adopt porous, alkalescence and be rich in Ca
2+slag and electrolytic manganese residues as co-induction crystal seed, for induced crystallization reaction create favourable condition, be conducive to crystalline growth.Finally, add a magnetic field to whole reactor, its magnetic force is conducive to the generation of OH, and then promotes crystal growing; Simultaneously due in compound crystal seed containing a large amount of iron, with magnetic force common in form magnetic flocculation effect down, and then improve the separating effect of crystal and water, also just improve the removal efficiency of phosphorus.
Compared to existing technology, beneficial effect of the present invention is:
(1) compared with the fluidized bed reactor of routine, Phosnix reactor, reactor of the present invention has enhancing mixed device and field system, enhance the critical process such as medicament mixing, induced crystallization and precipitate and separate, thus improve system dephosphorization and organic efficiency.
(2) crystal seed that the present invention adopts is slag and electrolytic manganese residues, and be waste material, raw materials cost is low, is easy to be separated with crystallisate, is convenient to the recycling of phosphorus, has potential comprehensive benefit.
(3) the present invention adopts magnetic field force to improve system induction crystalline rate and crystal and water separation efficiency, can improve the phosphorus ligands efficiency of system.
(4) Magnetic guidance crystallization apparatus of the present invention, required equipment is simple, simple to operate, control is simple, is conducive to producing implementing.
Accompanying drawing explanation
Fig. 1 is device schematic diagram of the present invention.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described, but the present invention is not limited to this.
Magnetic guidance crystallization of the present invention is removed and is reclaimed the device of phosphor in sewage, comprise reactor 1, medicine storage pool 2, water tank 3 and gas blower 4, reactor 1 connects medicine storage pool 2 by dosing pump 9, reactor 1 connects water tank 3 by water pump 10, reactor 1 also connects gas blower 4, described reactor comprises mixing zone 5, reaction zone 6 and settling region 7, and described mixing zone 5 arranges flap mixing device 8, and described reactor monolith is placed in magnetic field; Described magnetic field is standing field, is combined by positive pole N and negative pole S magnetic sheet, and by the size regulating positive pole N and negative pole S spacing to regulate magnetic field, also comprise controller 11, described controller 11 is connected with dosing pump 9, water pump 10 and gas blower 4 respectively simultaneously.
Embodiment 1
Certain municipal sewage sludge dehydration filtrate water-quality guideline: COD
cfor 660mg/L, NH
+ 4-N is 63.08mg/L, NO
3 --N is 0.5mg/L, TP is that 5.9mg/L. adopts the inventive method to carry out dephosphorization and recycling, specific as follows:
(1) reactor diameter shown in Fig. 1 of the present invention is D=0.10m, and useful volume is V=7.0L, and wherein size is determined according to graphic scale, magnet spacing L=0.5m, flap angle
; All dosings, water inlet and aeration are by controller in addition regulable control;
(2) adopt slag (particle diameter 0.01mm ~ 0.2mm) and electrolytic manganese residues (0.05mm ~ 0.30mm) as crystal seed, the mass ratio of slag and electrolytic manganese residues is 0.1, and dosage is should control 25g/L;
(3) magnetic induction control is at 40mT.
(4) CaCl is adopted
2for medicament, Ca/P mol ratio controls about 2.
(5) each processing parameter major control of the present invention is as follows: flooding velocity Q is 4.5L/h, and hydraulic detention time HRT is 1.5h, and aeration rate is 250L/h, and pH value controls 8.9.
(6) under these conditions after continuous and steady operation 10d, each pollute average aqueous concentration and removal effect as follows: water outlet ammonia nitrogen is 50.10mg/L, and ammonia nitrogen removal frank is 20.0%; Water outlet TP is 0.66mg/L, TP clearance is 88.8%, has good phosphor-removing effect as seen.Measure the rate of recovery of phosphorus, the rate of recovery reaches 85% simultaneously, has good recovering effect.
Embodiment 2
Certain municipal wastewater treatment plant nitrifying sludge dirt dehydration liquid: COD
cfor 1200mg/LL, NH
+ 4-N is 280.6mg/L, NO
3 --N is 0.05mg/L, TP is that 90.0mg/L. adopts the inventive method to carry out dephosphorization and recovery test, specific as follows:
(1) reactor diameter shown in Fig. 1 of the present invention is D=0.10m, and useful volume is V=7.0L, magnet spacing L=0.5m, flap angle
; All dosings, water inlet and aeration are by controller in addition regulable control;
(2) adopt slag (particle diameter 0.01mm ~ 0.2mm) and electrolytic manganese residues (0.05mm ~ 0.30mm) as crystal seed, the mass ratio of slag and electrolytic manganese residues is 0.1, and dosage controls at 40g/L;
(3) magnetic induction control is at 60mT.
(4) CaCl is adopted
2and MgCl
2as medicament, the mol ratio of two kinds of medicaments is 4:6, and conversion Ca/P mol ratio controls about 2.5.
(5) each processing parameter major control of the present invention is as follows: flooding velocity Q is 2.0L/h, and hydraulic detention time HRT is 3.5h, and aeration rate is 200L/h, and pH value controls 8.5.
(6) under these conditions after continuous and steady operation 10d, each pollute average aqueous concentration and removal effect as follows: water outlet ammonia nitrogen is 240.7mg/L, and ammonia nitrogen removal frank is 14.2%; Water outlet TP is 3.2mg/L, TP clearance is 96.4%, has good phosphor-removing effect as seen.Measure the rate of recovery of phosphorus, the rate of recovery reaches 87% simultaneously, has good recovering effect.
Claims (9)
1. Magnetic guidance crystallization is removed and is reclaimed a method for phosphor in sewage, it is characterized in that, comprises the following steps:
After rich phosphorus-containing wastewater mixes with medicament in mixing device, then the phosphorus in sewage forms insoluble crystal in the mode of induced crystallization in the reactor, in settler, rely on gravity to be separated with the effect of magnetic force tiny be rich in phosphorus crystal, thus the phosphorus in removal sewage, the crystal that part is tiny simultaneously comes back in reactor.
2. Magnetic guidance crystallization according to claim 1 is removed and is reclaimed the method for phosphor in sewage, it is characterized in that, described rich phosphorus-containing wastewater is carried from water tank by water pump, and pH controls 7.0 ~ 10.2, hydraulic detention time HRT controls at 1 ~ 8h, and gas-water ratio controls 50 ~ 150.
3. Magnetic guidance crystallization according to claim 1 is removed and is reclaimed the method for phosphor in sewage, and it is characterized in that, described medicament is CaCl
2, MgCl
2or both mixing solutionss, be only CaCl
2time Ca/P mol ratio control, 1.2 ~ 3, to be only MgCl
2during medicament, Mg/P mol ratio controls 1.0 ~ 2, and during mixing solutions for both, Ca/P mol ratio controls 0.8 ~ 2.0.
4. Magnetic guidance crystallization according to claim 1 is removed and is reclaimed the method for phosphor in sewage, and it is characterized in that, described mixing device is flap mixing device, and the angle between flap is 120 ~ 180 degree.
5. Magnetic guidance crystallization according to claim 1 is removed and is reclaimed the method for phosphor in sewage, it is characterized in that, described induced crystallization, device is Magnetic guidance crystallization apparatus, its crystal seed is combination crystal seed, be made up of slag and electrolytic manganese residues, the mass ratio of slag and electrolytic manganese residues is 0.1 ~ 0.2, and dosage controls at 5 ~ 50g/L.
6. Magnetic guidance crystallization according to claim 5 is removed and is reclaimed the method for phosphor in sewage, it is characterized in that, the magnetic field of described Magnetic guidance crystallization apparatus is standing field, combined by positive pole N and negative pole S magnetic sheet, by the size regulating the spacing of positive pole N and negative pole S to regulate magnetic field, the magnetic induction control in described magnetic field is between 30 ~ 150mT.
7. a Magnetic guidance crystallization is removed and reclaims the device of phosphor in sewage, it is characterized in that, comprise reactor, medicine storage pool, water tank and gas blower, reactor connects medicine storage pool by dosing pump, reactor connects water tank by water pump, and reactor also connects gas blower, and described reactor comprises mixing zone, reaction zone and settling region, described mixing zone arranges flap mixing device, and described reactor monolith is placed in magnetic field.
8. Magnetic guidance crystallization according to claim 7 is removed and is reclaimed the device of phosphor in sewage, and it is characterized in that, described magnetic field is standing field, is combined by positive pole N and negative pole S magnetic sheet, by the size regulating positive pole N and negative pole S spacing to regulate magnetic field.
9. the Magnetic guidance crystallization according to claim 7 or 8 is removed and is reclaimed the device of phosphor in sewage, and it is characterized in that, also comprise controller, described controller is connected with dosing pump, water pump and gas blower respectively.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510951309.3A CN105540770B (en) | 2015-12-19 | 2015-12-19 | A kind of Magnetic guidance crystallization removal and the method and device of recycling phosphor in sewage |
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|---|---|---|---|
| CN201510951309.3A CN105540770B (en) | 2015-12-19 | 2015-12-19 | A kind of Magnetic guidance crystallization removal and the method and device of recycling phosphor in sewage |
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| CN105540770B CN105540770B (en) | 2018-06-29 |
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Cited By (2)
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| CN112960814A (en) * | 2021-02-03 | 2021-06-15 | 中环国投(重庆)环保产业开发有限公司 | Harmless treatment method for leachate of electrolytic manganese slag |
| CN113860628A (en) * | 2021-11-18 | 2021-12-31 | 西安西热水务环保有限公司 | High-efficient crystallization equipment that softens of dense water of reverse osmosis |
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Cited By (2)
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| CN113860628A (en) * | 2021-11-18 | 2021-12-31 | 西安西热水务环保有限公司 | High-efficient crystallization equipment that softens of dense water of reverse osmosis |
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| CN105540770B (en) | 2018-06-29 |
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