CN114604917B - Method for recovering phosphorus by fluidized bed partition regulation Lan Tiedan crystallization - Google Patents
Method for recovering phosphorus by fluidized bed partition regulation Lan Tiedan crystallization Download PDFInfo
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- CN114604917B CN114604917B CN202210249013.7A CN202210249013A CN114604917B CN 114604917 B CN114604917 B CN 114604917B CN 202210249013 A CN202210249013 A CN 202210249013A CN 114604917 B CN114604917 B CN 114604917B
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- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 55
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 239000011574 phosphorus Substances 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000005192 partition Methods 0.000 title claims abstract description 7
- 238000002425 crystallisation Methods 0.000 title claims description 13
- 230000008025 crystallization Effects 0.000 title claims description 13
- 230000033228 biological regulation Effects 0.000 title description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 239000013078 crystal Substances 0.000 claims abstract description 26
- 239000002351 wastewater Substances 0.000 claims abstract description 21
- 230000001276 controlling effect Effects 0.000 claims abstract description 20
- 239000003513 alkali Substances 0.000 claims abstract description 17
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- 238000010992 reflux Methods 0.000 claims abstract description 10
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 claims abstract description 9
- 239000012266 salt solution Substances 0.000 claims abstract description 9
- 230000000630 rising effect Effects 0.000 claims abstract description 6
- 229910001657 ferrierite group Inorganic materials 0.000 claims abstract description 5
- 238000005086 pumping Methods 0.000 claims abstract description 4
- 238000005243 fluidization Methods 0.000 claims description 19
- 238000001556 precipitation Methods 0.000 claims description 15
- 238000004062 sedimentation Methods 0.000 claims description 14
- 230000014759 maintenance of location Effects 0.000 claims description 9
- 238000013316 zoning Methods 0.000 claims description 4
- 230000001174 ascending effect Effects 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 238000012544 monitoring process Methods 0.000 claims 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 25
- 229910052742 iron Inorganic materials 0.000 abstract description 10
- 229910019142 PO4 Inorganic materials 0.000 abstract description 8
- 239000010452 phosphate Substances 0.000 abstract description 8
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 abstract description 7
- 239000004575 stone Substances 0.000 abstract description 7
- 238000005516 engineering process Methods 0.000 abstract description 4
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 abstract description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 239000010865 sewage Substances 0.000 description 5
- 229910052567 struvite Inorganic materials 0.000 description 5
- 239000000047 product Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 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 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 238000002441 X-ray diffraction Methods 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
- 239000003337 fertilizer Substances 0.000 description 2
- 238000010899 nucleation Methods 0.000 description 2
- 230000006911 nucleation Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000002367 phosphate rock Substances 0.000 description 2
- 239000012265 solid product Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 229910010710 LiFePO Inorganic materials 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000012670 alkaline solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- CADZRPOVAQTAME-UHFFFAOYSA-L calcium;hydroxy phosphate Chemical compound [Ca+2].OOP([O-])([O-])=O CADZRPOVAQTAME-UHFFFAOYSA-L 0.000 description 1
- 230000019522 cellular metabolic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009713 electroplating Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 230000002068 genetic effect Effects 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 230000000877 morphologic effect Effects 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000036186 satiety Effects 0.000 description 1
- 235000019627 satiety Nutrition 0.000 description 1
- 238000004626 scanning electron microscopy Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010801 sewage sludge Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 239000011232 storage material Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 229910000859 α-Fe Inorganic materials 0.000 description 1
Classifications
-
- 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
-
- 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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F2001/5218—Crystallization
-
- 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
Abstract
The invention discloses a method for recovering phosphorus by controlling Lan Tiedan crystals in a fluidized bed partition mode. The method comprises the following steps: s1, pumping ferrous salt solution and phosphorus-containing wastewater into a water inlet area of a fluidized bed according to a molar ratio of Fe (II) to P of 1.5; s2, regulating and controlling the pH value of each section of the fluidized bed by controlling alkali liquor addition so that the supersaturation level of each section of the fluidized bed reaches the target requirement; s3, regulating and controlling the rising flow rates of the fluidized bed water inlet area, the fluidized area and the growth area by controlling the reflux ratio; s4, setting a discharge period according to the actual running condition of the fluidized bed, opening a crystal discharge port at the bottom of the water inlet area, and collecting the blue ferrierite crystals. The method does not need to add a large amount of alkali liquor, and the ferrous iron is low in cost and easy to obtain, so that the technology has higher economical efficiency; in addition, the invention can realize high phosphate removal rate and recover high-quality blue iron stone crystals for high, medium and low-concentration phosphorus-containing wastewater.
Description
Technical Field
The invention belongs to the technical field of wastewater treatment, and particularly relates to a method for recovering phosphorus by controlling Lan Tiedan crystals in a fluidized bed partition mode.
Background
Phosphorus is an essential element constituting organisms, is an important substance involved in transmitting genetic information and controlling normal metabolism of cells of the organisms, and is a nonmetallic mineral resource which is difficult to regenerate. The eutrophication of water body caused by the rapid consumption and excessive discharge of phosphorus resources is a strategic problem related to grain safety and ecological safety. Most of the phosphorus flows unidirectionally in the biosphere, while the reserves of phosphorus ore are very limited, and phosphorus will become the limiting factor for human and land life activities. The national resource department has listed phosphorite resources as one of 20 ores which cannot meet the national economic development requirement after 2010. With the continuous rising of the emission standards of nutrients and the sustainable development of resource utilization, sewage sludge treatment technology has begun to develop toward the direction of phosphorus removal and phosphorus recovery. The amount of phosphorus lost in the sewage is very huge, and according to statistics, urban sewage realizes phosphorus recovery and can meet 15% -20% of phosphate rock requirements in the global scope. The requirements of the state of swiss and germany are imposed by the law for phosphorus recovery in sewage. Therefore, ensuring the effective recovery and reuse of phosphorus in wastewater is an effective method for alleviating the rapid consumption of phosphorus resources.
At present, phosphate is difficult to separate from phosphorus-rich sludge formed by traditional biological phosphorus removal and chemical phosphorus removal, and how to induce and strengthen phosphate crystal growth has become the focus of research on the current phosphorus recovery of sewage. The common phosphorus-containing crystallization products in the wastewater treatment process mainly comprise magnesium ammonium phosphate (MgNH) 4 PO 4 ·6H 2 O, also known as struvite), and calcium hydroxy phosphate (Ca 5 (PO 4 ) 3 OH, also known as hydroxyA phosphate stone). Wherein, the common struvite crystallization can realize the simultaneous removal of two elements of nitrogen and phosphorus and can be used as fertilizer to simultaneously provide the two elements of nitrogen and phosphorus, but the condition of struvite crystallization is greatly restricted by pH (suitable pH is 9.10-10.17), and the phosphorus-containing wastewater is required to be degassed (CO) before the crystallization reaction 2 ) And a large amount of alkali liquor is added to maintain an alkaline environment, so that the treatment cost of phosphorus recovery of sewage is greatly increased.
Lan Tiedan (Fe) 3 (PO 4 ) 2 ·8H 2 O) crystallization is a new technology for recycling wastewater phosphorus with application prospect. Lan Tiedan can be used as fertilizer to provide phosphorus and iron for plants, and can also be used as energy storage material, namely lithium iron phosphate (LiFePO) 4 ) Is one of the main synthesis raw materials of the power lithium electronic battery. In theory, the pH range in which the blue iron stone can crystallize is 5-10, but the pH range in which the blue iron stone can crystallize is different for wastewater with different phosphorus concentrations, and in addition, the difference of supersaturation levels under the coupling condition of pH-phosphate concentration also influences the phosphorus removal efficiency, the morphological characteristics and the particle size distribution of crystals, thereby influencing the separation efficiency of products. On the other hand, the dual effect of pH on the oxidation of Fe (II) and the rate of crystallization of the blue iron ore determines the nature of the recovered product. Both nucleation and growth of crystals are associated with supersaturation levels, with higher levels of supersaturation favoring nucleation and phosphate removal, and lower levels of supersaturation being required for crystal growth. High-quality blue iron stone crystals are not obtained at the same time when efficient dephosphorization is not realized at present.
Disclosure of Invention
The invention aims at solving the problems in the prior art and provides a method for recovering phosphorus by controlling Lan Tiedan crystals in a fluidized bed partition mode. The technical scheme of the invention is realized by the following steps:
s1, respectively setting corresponding flow rates according to the Fe (II)/P molar ratio of 1.5, and pumping the ferrous salt solution and the phosphorus-containing wastewater into a water inlet area of a fluidized bed;
s2, online detecting PO of a fluidization area, a growth area and a precipitation area of the fluidized bed 4 -P, fe (II) concentration and pH value, and calculating the satiety of each section of the fluidized bed in real timeAnd level by varying PO 4 The P concentration phosphorus-containing wastewater is matched with corresponding alkali liquor adding measures, so that the pH value of each section of the fluidized bed is regulated and controlled to enable the supersaturation level of each section of the fluidized bed to reach the target requirement;
s3, regulating and controlling the rising flow rates of the fluidized bed water inlet area, the fluidized area and the growth area by controlling the reflux ratio;
s4, setting a discharge period according to the actual running condition of the fluidized bed, opening a crystal discharge port at the bottom of the water inlet area, and collecting the blue ferrierite crystals.
Preferably, alkali liquor and ferrous salt solution are added to the fluidized bed in the fluidized zone, the growing zone and the precipitating zone in a multi-point liquid feeding mode, and alkali liquor is injected into each section of the fluidized bed by an automatic alkali adding pump of a pH control system.
Preferably, for processing PO 4 The pH values of the fluidization area, the growth area and the sedimentation area of the fluidized bed can be regulated and controlled to be 5, 5 and 7 respectively; for processing PO 4 The pH values of the fluidization zone, the growth zone and the sedimentation zone of the fluidized bed can be regulated to be 6, 6 and 7 respectively.
Preferably, the target level of supersaturation for the fluidization zone and the growth zone is in the range of 4 to 6 and the target level of supersaturation for the precipitation zone is in the range of 6 to 8.
Preferably, the hydraulic retention time of the phosphorus-containing wastewater from the water inlet to the growth zone and the hydraulic retention time in the precipitation zone are both 30min, and the total hydraulic retention time is 60min.
Preferably, the ascending flow rates of the fluidized bed water inlet zone, the fluidized zone, the growing zone and the sedimentation zone are respectively regulated to be 100-400cm/min, 50-200cm/min, 10-50cm/min and 1-10cm/min, and part of water outlet of the sedimentation zone at the top end flows back to the water inlet zone at the bottom end of the fluidized bed.
The invention has the following advantages:
(1) the theoretical pH range of the blue iron stone is wider, the neutral pH value is covered, a large amount of alkali liquor is not needed to be added, and the ferrous iron is low in cost and easy to obtain, so that the technology has higher economical efficiency; (2) the invention can realize high phosphate removal rate and recover high-quality blue iron stone crystals for high, medium and low concentration phosphorus-containing wastewater.
Drawings
FIG. 1 is a schematic flow chart of a method for recovering phosphorus by controlling Lan Tiedan crystals in a fluidized bed partition mode.
Detailed Description
The patent embodiments of the present invention are described in detail below with reference to the accompanying drawings.
A method for recovering phosphorus by fluidized bed zoning regulation Lan Tiedan crystallization comprises the following steps:
s1, respectively setting corresponding flow rates according to the Fe (II)/P molar ratio of 1.5, and pumping the ferrous salt solution and the phosphorus-containing wastewater into a water inlet area of a fluidized bed;
s2, detecting PO of a fluidization area, a growth area and a sedimentation area of the fluidized bed on line 4 -P, fe (II) concentration and pH and calculating the supersaturation level of each section of the fluidised bed in real time for the treatment of PO 4 The pH values of the fluidization area, the growth area and the sedimentation area of the fluidized bed can be regulated and controlled to be 5, 5 and 7 respectively; for processing PO 4 The pH values of the fluidization zone, the growth zone and the sedimentation zone of the fluidized bed can be regulated to be 6, 6 and 7 respectively. Regulating the pH value of each section of the fluidized bed so that the supersaturation level of each section of the fluidized bed reaches the target requirement; the target requirement of the supersaturation level of the fluidization area and the growth area is 4-6, and the target requirement of the supersaturation level of the sedimentation area is 6-8; the alkali liquor feeding and the ferrous salt solution feeding of the fluidized bed fluidization area, the growth area and the precipitation area adopt a multi-point liquid feeding mode, wherein the alkali liquor feeding mode is that an automatic alkali feeding pump of a pH control system injects alkali liquor into each section of the fluidized bed.
S3, controlling the rising flow rates of the fluidized bed water inlet zone, the fluidized zone, the growing zone and the sedimentation zone to be 100-400cm/min, 50-200cm/min, 10-50cm/min and 1-10cm/min respectively by controlling the reflux ratio, and refluxing part of water outlet of the sedimentation zone at the top end to the water inlet zone at the bottom end of the fluidized bed. The hydraulic retention time of the phosphorus-containing wastewater from the water inlet to the growth zone and the hydraulic retention time in the precipitation zone are both 30min, and the total hydraulic retention time is 60min.
S4, setting a discharge period according to the actual running condition of the fluidized bed, opening a crystal discharge port at the bottom of the water inlet area, and collecting the blue ferrierite crystals.
Example 1
Will 310mg/LPO 4 P-concentration phosphorus-containing wastewater and 83.406g/L ferrous salt solution are pumped into the water inlet area of the fluidized bed at the flow rate of 500L/h and 25L/h respectively, so that the molar ratio of Fe (II)/P is 1.5; the pH value inside the fluidized bed is monitored in real time by a pH meter, and PO in the fluidization area, the growth area and the precipitation area of the fluidized bed is detected on line 4 -P and Fe (II) concentrations, calculating in real time the supersaturation levels of each section of the fluidized bed, injecting 1mol/L sodium hydroxide solution into each section of the fluidized bed by means of an automatic alkaline pump of a pH control system according to the target supersaturation levels, so as to regulate the pH values of the crystal growth zone, the fluidization zone and the precipitation zone of the fluidized bed to be 5, 5 and 7, respectively; controlling the reflux ratio to be 600%, wherein the ascending flow rates of the fluidized bed water inlet zone, the fluidized zone and the growth zone are respectively 300cm/min, 135cm/min and 35cm/min, so that part of water discharged from the sedimentation zone at the top end flows back to the water inlet zone at the bottom end of the fluidized bed; setting the discharge period to be 10 days, opening a crystal discharge outlet at the bottom of the water inlet area, and collecting the blue ferrites crystals.
Example 2
The metal spraying company performs acid washing and phosphating treatment on the parts, a certain amount of wastewater is discharged in the production process, and the main pollutants are phosphate (200 mg/LPO 4 P) and COD (1200 mg/L), the pH of the wastewater is about 4-5. Engineering scale of 5m 3 And/h. Before the fluidized bed reactor is started, the water inlet valves, the reflux valves and the power switches of the pumps are respectively opened. The phosphating waste water and 53.81g/L of ferrous salt solution were pumped into the water inlet zone of the fluidised bed at a flow rate of 500L/h and 25L/h respectively, so that the Fe (II)/P molar ratio was 1.5. The pH value inside the fluidized bed is monitored in real time by a pH meter, and PO in the fluidization area, the growth area and the precipitation area of the fluidized bed is detected on line 4 -P and Fe (II) concentrations, calculating in real time the supersaturation levels of each section of the fluidized bed, injecting an alkaline solution into each section of the fluidized bed by means of an automatic alkaline pump of the pH control system according to the target supersaturation levels, to regulate the pH values of the crystal growth zone, the fluidization zone and the precipitation zone of the fluidized bed to be 6, 6 and 7, respectively. Controlling the reflux ratio to be 600%, wherein the rising flow rates of the fluidized bed water inlet area, the fluidized area and the growth area are respectively 300cm/minAnd (3) refluxing part of water discharged from the sedimentation zone at the top end to the water inlet zone at the bottom end of the fluidized bed at 135cm/min and 35 cm/min. Setting the discharge period to be 15 days, opening a crystal discharge outlet at the bottom of the water inlet area, and collecting the blue ferrierite crystals. Under stable operation, PO 4 -P removal of 99.9%, PO of treated water 4 The P concentration is only 0.5mg/L, which meets the discharge Standard for pollution of electroplating Water (DB-44/1597-2015). The solid product obtained was freeze-dried, purged with nitrogen and stored in a dark place with a tinfoil wrap. The resulting product was analyzed by X-ray diffraction analysis (XRD) and Scanning Electron Microscopy (SEM), and the solid product obtained was high quality Lan Tiedan crystals with a particle size of 500 μm.
Claims (4)
1. A method for recovering phosphorus by controlling Lan Tiedan crystallization in a fluidized bed partition mode is characterized by comprising the following steps of: the method comprises the following steps:
s1, respectively setting corresponding flow rates according to the Fe (II)/P molar ratio of 1.5, and pumping the ferrous salt solution and the phosphorus-containing wastewater into a water inlet area of a fluidized bed;
s2, online monitoring PO of a fluidization area, a growth area and a precipitation area of the fluidized bed 4 P, fe (II) concentration and pH and the supersaturation level of each section of the fluidised bed is calculated in real time by means of the reaction of different PO' s 4 The P concentration phosphorus-containing wastewater is matched with corresponding alkali liquor adding measures, so that the pH value of each section of the fluidized bed is regulated and controlled to enable the supersaturation level of each section of the fluidized bed to reach the target requirement; for processing PO 4 P concentration of the phosphorus-containing wastewater above 300mg/L, and regulating and controlling pH values of a fluidization area, a growth area and a precipitation area of the fluidized bed to be 5, 5 and 7 respectively; for processing PO 4 P concentration of 100mg/L-300mg/L of phosphorus-containing wastewater, and regulating and controlling pH values of a fluidization area, a growth area and a precipitation area of the fluidized bed to be 6, 6 and 7 respectively;
s3, regulating and controlling the rising flow rates of the fluidized bed water inlet area, the fluidized area and the growth area by controlling the reflux ratio; regulating the ascending flow rates of the water inlet zone, the fluidization zone, the growth zone and the sedimentation zone of the fluidized bed to be 100-400cm/min, 50-200cm/min, 10-50cm/min and 1-10cm/min respectively, and refluxing part of water outlet of the sedimentation zone at the top end to the water inlet zone at the bottom end of the fluidized bed;
s4, setting a discharge period according to the actual running condition of the fluidized bed, opening a crystal discharge port at the bottom of the water inlet area, and collecting the blue ferrierite crystals.
2. The method for recovering phosphorus by fluidized bed zoning control Lan Tiedan crystallization according to claim 1, wherein the method comprises the following steps: the alkali liquor feeding and the ferrous salt solution feeding of the fluidized bed fluidization area, the growth area and the precipitation area adopt a multi-point liquid feeding mode, wherein the alkali liquor feeding mode is that an automatic alkali feeding pump of a pH control system injects alkali liquor into each section of the fluidized bed.
3. The method for recovering phosphorus by fluidized bed zoning control Lan Tiedan crystallization according to claim 1, wherein the method comprises the following steps: the target requirement for the supersaturation level of the fluidization zone and the growth zone is 4 to 6, and the target requirement for the supersaturation level of the precipitation zone is 6 to 8.
4. The method for recovering phosphorus by fluidized bed zoning control Lan Tiedan crystallization according to claim 1, wherein the method comprises the following steps: the hydraulic retention time of the phosphorus-containing wastewater from the water inlet to the growth zone and the hydraulic retention time in the precipitation zone are both 30min, and the total hydraulic retention time is 60min.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1964921A (en) * | 2004-02-13 | 2007-05-16 | 不列颠哥伦比亚大学 | Fluidized bed wastewater treatment |
| CN104445555A (en) * | 2014-03-17 | 2015-03-25 | 友达光电股份有限公司 | Wastewater dephosphorization method and preparation method of ferrous phosphate |
| CN113816438A (en) * | 2021-11-22 | 2021-12-21 | 金驰能源材料有限公司 | Nickel-cobalt-aluminum ternary precursor and preparation method thereof |
| CN113893572A (en) * | 2021-11-23 | 2022-01-07 | 中南大学 | Crystallization method of beta-ammonium tetramolybdate |
-
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1964921A (en) * | 2004-02-13 | 2007-05-16 | 不列颠哥伦比亚大学 | Fluidized bed wastewater treatment |
| CN104445555A (en) * | 2014-03-17 | 2015-03-25 | 友达光电股份有限公司 | Wastewater dephosphorization method and preparation method of ferrous phosphate |
| CN113816438A (en) * | 2021-11-22 | 2021-12-21 | 金驰能源材料有限公司 | Nickel-cobalt-aluminum ternary precursor and preparation method thereof |
| CN113893572A (en) * | 2021-11-23 | 2022-01-07 | 中南大学 | Crystallization method of beta-ammonium tetramolybdate |
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