CN210974184U - Recovery unit of phosphorus in sewage plant second grade play water - Google Patents
Recovery unit of phosphorus in sewage plant second grade play water Download PDFInfo
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- CN210974184U CN210974184U CN201921361046.0U CN201921361046U CN210974184U CN 210974184 U CN210974184 U CN 210974184U CN 201921361046 U CN201921361046 U CN 201921361046U CN 210974184 U CN210974184 U CN 210974184U
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Abstract
The utility model discloses a recovery device for phosphorus in secondary effluent of a sewage plant, which comprises a forced agglomeration crystallizer, a sedimentation tank and a filtering tank which are communicated in sequence; the forced agglomeration crystallizer is provided with a water inlet, a calcium salt feeding port, an alkali liquor feeding port and an HAP seed crystal feeding port; and the crystallized product HAP generated in the forced agglomeration crystallizer enters the sedimentation tank along with ascending water flow, and the supernatant after the crystallized product HAP is removed by the sedimentation tank enters a filtering tank. The utility model has the characteristics of simple structure, strong adaptability to low phosphorus concentration, stable dephosphorization effect, low running cost, high phosphorus recovery rate, high recycle value are showing.
Description
Technical Field
The utility model belongs to the technical field of sewage phosphorus recovery, especially, relate to a recovery unit of phosphorus in sewage plant's second grade play water.
Background
In order to comprehensively restrain water environment pollution and control water eutrophication, the improvement of standards of sewage plants is carried out in China from 2006, the effluent standard is improved from primary B to primary A in pollutant discharge Standard of urban Sewage treatment plant (GB 18918 plus 2002), wherein phosphorus is a core control index, and the limit values of phosphorus in the primary B and primary A standards are 1.0 mg/L and 0.5 mg/L respectively.
The practice shows that the phosphorus removal effect of the materialized deep phosphorus removal technology is obvious, and the Total Phosphorus (TP) content of effluent completely meets the first-class A standard of pollutant emission standard of urban sewage treatment plants (GB 18918-.
But the disadvantages of the materialized deep phosphorus removal technology are also obvious: firstly, a large amount of aluminum-series or iron-series coagulant needs to be added, the yield of chemical sludge is high, and the running cost of water treatment and the treatment cost of sludge treatment are increased; secondly, the phosphorus in the sewage is difficult to be recycled. However, phosphorus is a one-way circulating resource in the world, and currently, the world faces a serious phosphorus resource crisis, and under the background, how to recycle phosphorus is a problem to be considered in deep phosphorus removal of sewage plants. Therefore, the sewage plant urgently needs to modify the established advanced phosphorus removal process, comprehensively recover phosphorus in the sewage and realize zero emission of phosphorus-containing chemical sludge.
The technology of induced crystallization phosphorus removal is widely applied to treatment and resource utilization of phosphorus-containing sewage, and is proved to be capable of recovering most of phosphorus in the sewage, and simultaneously, coagulant is not needed to be added in the crystallization process, and chemical sludge is not generated.
Chinese invention patent (CN 104310641A) discloses a method for deeply removing phosphorus from low-phosphorus water, which adopts modified coral sand as seed crystal, and utilizes first-stage fluidized bed crystallization and second-stage national fixed bed crystallization to reduce the phosphorus in the second-stage effluent of sewage plant to below 0.2 mg/L, and at the same time the phosphorus in the sewage is recovered in the form of crystallized product HAP, but said method adopts the series connection of fluidized bed and fixed bed, and their hydraulic retention time can be up to 5.46h and 4.58h, and the volume of correspondent required equipment or structure is large, and its water content is 10 ten thousand m3The sewage plant of/d is taken as an example, the method needs the total volume of equipment or structures to reach 4 ten thousand meters3Obviously, the method is difficult to realize in the quality improvement and transformation of the secondary effluent deep phosphorus removal process of the sewage plant.
In a word, no report on a device for recycling phosphorus in the deep phosphorus removal process of a sewage plant exists so far, so that the requirement of a first-level A standard on the phosphorus concentration limit value can be met after secondary water treatment, and phosphorus can be recycled.
Disclosure of Invention
The present application is directed to solving at least one of the problems in the prior art. Therefore, the invention aims to provide the device for recovering the phosphorus in the secondary effluent of the sewage plant, which has good treatment effect and high phosphorus recovery and utilization value.
In order to solve the technical problem, the utility model adopts the following technical scheme:
a recovery device for phosphorus in secondary effluent of a sewage plant comprises a forced agglomeration crystallizer, a sedimentation tank and a filtering tank which are communicated in sequence;
the forced agglomeration crystallizer is provided with a water inlet, a calcium salt feeding port, an alkali liquor feeding port and an HAP seed crystal feeding port;
and the crystallized product HAP generated in the forced agglomeration crystallizer enters the sedimentation tank along with ascending water flow, and the supernatant after the crystallized product HAP is removed by the sedimentation tank enters a filtering tank.
Further, a stirring device is arranged in the forced agglomeration crystallizer.
Further, the sedimentation tank comprises a primary sedimentation tank and a secondary sedimentation tank, and a sewage discharge outlet of the secondary sedimentation tank is connected to a seed crystal supplementing opening at the bottom of the forced agglomeration crystallizer through a sludge reflux pump.
Furthermore, a hydraulic cyclone concentrator is further arranged on a pipeline connecting the sludge reflux pump and the seed crystal supplementing port, and overflow supernatant of the hydraulic cyclone concentrator and supernatant of the secondary sedimentation tank are mixed and then enter the filtering tank.
Furthermore, the device also comprises a NaOH solution feeding barrel, wherein a discharge port of the NaOH solution feeding barrel is connected to an alkali liquor feeding port through a first conveying pipeline.
Further, the lime solution feeding device further comprises a lime solution feeding barrel, and a discharge port of the lime solution feeding barrel is connected to a calcium salt feeding port through a second conveying pipe.
Compared with the prior art, the beneficial effects of the utility model reside in that:
1. the method is improved on the existing 'coagulation-precipitation-filtration' unit, namely, a forced agglomeration crystallizer is additionally arranged, a secondary sedimentation tank sludge reflux and hydraulic cyclone concentrator are additionally arranged, and stirring of a coagulation tank is cancelled. The forced agglomeration crystallizer and the water flow vortex concentrator which are additionally arranged adopt equipment, and have the remarkable characteristics of short retention time, small volume and less occupied area.
2. The device does not need to add a coagulant and generate chemical sludge, and the removed phosphorus is recycled in a form of a crystallized product; and the crystal seeds adopt HAP particles, so that the purity of a crystallized product is very high, the phosphorus recycling value is high, and the crystal seeds can be directly recycled as high-quality phosphate fertilizers.
3. The utility model discloses an improve seed crystal particulate matter number density, carry out the compulsory stirring, and utilize ascending rivers, to construct crystal ion to the attached surface crystallization one by one of seed crystal surface with the crystallization process, regulate and control the compulsory agglomeration crystallization process of HAP molecular cluster and seed crystal, make the crystallization process can realize under lower HAP supersaturation, thereby improved the adaptability to low phosphorus concentration, and the dephosphorization is efficient, device water phosphorus concentration can fall to below 0.3 mg/L, reach IV class standard of "surface water environmental quality standard" (GB 3838-.
4. The dephosphorization effect is stable. The utility model discloses synchronous secondary nucleation phenomenon of taking place among the make full use of forced induction crystallizer, new crystal nucleus are behind second grade sedimentation tank solid-liquid separation, and partly flow back to forced induction crystallizer again through the concentration to the guarantee is forced induction crystallizer and is maintained at high particulate matter number density level all the time, and the dephosphorization effect of crystallization is stable.
5. Low medicine consumption and low operation cost. The utility model discloses well PO4 3-、OH-And Ca2+The crystallization mode is the forced agglomeration crystallization of HAP molecular clusters and seed crystals, the reaction process can be completed under lower HAP supersaturation degree, and the system can be maintained at lower OH-And Ca2+The concentration level correspondingly saves the medicine consumption of NaOH and lime.
To sum up, the utility model relates to a simple structure, have to low phosphorus concentration strong adaptability, dephosphorization effect stable, the running cost low, phosphorus recycle rate is high, recycle is worth high showing characteristics.
Drawings
FIG. 1 is a schematic view of a materialized deep phosphorus removal apparatus of an urban sewage plant;
fig. 2 is a schematic structural view of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, the existing apparatus for deeply removing phosphorus from municipal sewage plants comprises: and (3) after the secondary effluent enters the coagulation tank I, mixing and reacting with a coagulant under the action of a stirring device A to generate a phosphorus-containing flocculating constituent. And (3) settling the flocculating constituent in the sedimentation tank II, conveying the chemical sludge formed by settling to a subsequent sludge treatment unit, and filtering clear water to reach the standard and discharge after supernatant enters a filtering tank III to further remove suspended matters.
Referring to fig. 2, the device for recovering phosphorus from secondary effluent of a sewage plant provided by the utility model comprises a forced agglomeration crystallizer 1, a sedimentation tank and a filtering tank 9 which are communicated in sequence; the forced agglomeration crystallizer 1 is provided with a water inlet, a calcium salt feeding port, an alkali liquor feeding port and an HAP seed crystal feeding port; the liquid outlet of the forced agglomeration crystallizer 1 is communicated with the liquid inlet of the sedimentation tank through a pipeline, and a stirring device 4 is also arranged in the forced agglomeration crystallizer 1.
The effluent of the secondary sedimentation tank of the urban sewage plant firstly enters a forced agglomeration crystallizer 1, wherein PO is4 3-With OH from NaOH solution addition tank 2-And Ca from the lime solution charging barrel 32+Firstly, cluster reaction is carried out to generate nano HAP molecule agglomeration and HAP molecule groupThe cluster and the HAP seed crystal with high particle number density in the forced agglomeration crystallizer 1 are subjected to rapid agglomeration crystallization under the combined action of forced stirring of the stirring device 4 and ascending water flow to generate a crystallization product HAP, the crystallization product HAP enters a sedimentation tank from a liquid outlet of the forced agglomeration crystallizer 1 along with the ascending water flow, and a supernatant after the crystallization product HAP is removed by the sedimentation tank enters a filtering tank 9.
In practical application, the sedimentation tank comprises a primary sedimentation tank 7 and a secondary sedimentation tank 8, and a sewage discharge outlet of the secondary sedimentation tank 8 is connected to a seed crystal supplementing port at the bottom of the forced agglomeration crystallizer 1 through a sludge reflux pump 5. A hydraulic cyclone concentrator 6 is also arranged on a pipeline connecting the sludge reflux pump 5 and the seed crystal supplementing port, and the overflow supernatant of the hydraulic cyclone concentrator 6 is mixed with the supernatant of the secondary sedimentation tank 8 and then enters a filtering tank 9.
Wherein, the one-level sedimentation tank 7 is come through cancelling agitating unit A by the coagulation basin I in figure 1, and the sedimentation tank II in figure 1 is adopted to second grade sedimentation tank 8, and all the other structures of one-level sedimentation tank 7 and second grade sedimentation tank 8 do not do the improvement, for current structure, do not describe here again.
It can be understood that, in practical design, the device can also comprise a NaOH solution feeding barrel 2 and a lime solution feeding barrel 3, wherein a discharge port of the NaOH solution feeding barrel 2 is connected to the alkali liquor feeding port through a first conveying pipeline, and a discharge port of the lime solution feeding barrel is connected to the calcium salt feeding port through a second conveying pipeline.
The process of recovering phosphorus by adopting the device for recovering phosphorus in the secondary effluent of the sewage plant comprises the following steps: the effluent of the secondary sedimentation tank of the urban sewage plant firstly enters a forced agglomeration crystallizer 1, wherein PO is4 3-With OH from NaOH solution addition tank 2-And Ca from the lime solution charging barrel 32+Firstly, clustering reaction is carried out to generate nano HAP molecular agglomeration. The HAP molecular cluster and the HAP seed crystal with high particle number density in the forced agglomeration crystallizer 1 are subjected to rapid agglomeration crystallization under the combined action of forced stirring and ascending water flow of the stirring device 4 to generate a crystallization product HAP. Meanwhile, due to forced stirring and high particle number density, the HAP particles of the crystallized product are mutually rubbed and collided, and part of the HAP of the crystallized product is crushed to generateNew nuclei, i.e. secondary nucleation. The crystallized product HAP and new crystal nucleus enter a primary sedimentation tank along with water flow. The particle size of the HAP particles of the crystallization product is larger, the sedimentation performance is good, sedimentation occurs in a primary sedimentation tank, the HAP particles are discharged outside and then are recycled as phosphate fertilizer, fine crystal nuclei enter a secondary sedimentation tank along with water flow and generate sedimentation, supernatant enters a filtering tank III, and filtered clear water is discharged after reaching the standard.
And one part of the crystal nucleus sludge precipitated in the secondary sedimentation tank is discharged and recycled as a product, and the other part of the crystal nucleus sludge is pumped into a sludge hydraulic cyclone concentrator 6 by a sludge reflux pump 5 for concentration. And mixing the overflow supernatant of the hydraulic cyclone concentrator 6 with the supernatant of the secondary sedimentation tank, then feeding the mixture into a filter tank III, and refluxing the concentrated sludge to the forced agglomeration crystallizer 1 to maintain the high number density of the particles in the forced agglomeration crystallizer 1.
This application is through add before current coagulation bath I force agglomeration crystallizer 1 and throw with its supporting NaOH solution and add bucket 2, lime solution and throw with bucket 3 and agitating unit 4, force the agglomeration crystallizer to be equipped with water inlet, calcium salt input mouth, alkali lye input mouth and HAP seed crystal input mouth, lime solution throws with bucket 3 and passes through the second. A stirring device A in the coagulation tank 1 is omitted, and the corresponding coagulation tank 1 is called a primary sedimentation tank; a sludge reflux pump 5 and a sludge hydraulic cyclone concentrator 6 are additionally arranged at the sedimentation tank II, and the corresponding sedimentation tank II is called a secondary sedimentation tank; the original filter tank III is kept unchanged.
In the application, a forced agglomeration crystallization reactor is additionally arranged in front of a coagulation, precipitation and filtration deep phosphorus removal device; the original coagulation tank is changed into a primary sedimentation tank; a sludge reflux pump and a reflux sludge hydraulic cyclone concentrator are additionally arranged in the original sedimentation tank, and the sedimentation tank is called a secondary sedimentation tank; the original filter tank is not changed. The forced agglomeration crystallization reactor adopts a fluidized bed structure form, carries out forced mechanical stirring, and adds high-concentration small-particle HAP as seed crystal to form high particle number density. Phosphorus and added OH in secondary effluent in forced agglomeration crystallization reactor-And Ca2+Firstly, molecular cluster reaction is carried out, and then the molecular cluster and HAP seed crystal are subjected to rapid agglomeration crystallization to generate a crystallization product HAP; meanwhile, the forced agglomeration crystallization reactor also generates secondary nucleation to generate new crystalsAnd new crystal nuclei are settled in the secondary sedimentation tank, one part of the new crystal nuclei is recovered as phosphorus resources, the other part of the new crystal nuclei is concentrated by a hydraulic cyclone concentrator and then flows back to a forced agglomeration crystallization reactor to maintain high particle number density, overflow supernatant of the hydraulic cyclone concentrator is mixed with supernatant of the secondary sedimentation tank and then enters a filtering tank, filtered clear water reaches the standard and is discharged, and the phosphorus concentration of effluent of the system can be stabilized below 0.3 mg/L after being modified.
The above examples are merely illustrative of the present invention clearly and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious changes and modifications may be made without departing from the scope of the present invention.
Claims (6)
1. The utility model provides a recovery unit of phosphorus in sewage plant second grade play water which characterized in that: comprises a forced agglomeration crystallizer, a sedimentation tank and a filtering tank which are communicated in sequence;
the forced agglomeration crystallizer is provided with a water inlet, a calcium salt feeding port, an alkali liquor feeding port and an HAP seed crystal feeding port;
and the crystallized product HAP generated in the forced agglomeration crystallizer enters the sedimentation tank along with ascending water flow, and the supernatant after the crystallized product HAP is removed by the sedimentation tank enters a filtering tank.
2. The recycling apparatus according to claim 1, wherein: and a stirring device is arranged in the forced agglomeration crystallizer.
3. The recycling apparatus according to claim 1 or 2, characterized in that: the sedimentation tank comprises a primary sedimentation tank and a secondary sedimentation tank, and a sewage discharge outlet of the secondary sedimentation tank is connected to a seed crystal supplementing opening at the bottom of the forced agglomeration crystallizer through a sludge reflux pump.
4. A recycling apparatus according to claim 3, characterized in that: and a hydraulic cyclone concentrator is also arranged on a pipeline connecting the sludge reflux pump and the seed crystal supplementing port, and the overflow supernatant of the hydraulic cyclone concentrator and the supernatant of the secondary sedimentation tank are mixed and then enter the filtering tank.
5. A recycling apparatus according to claim 3, characterized in that: still include NaOH solution and throw the bucket with, the discharge gate of NaOH solution throw the bucket with is connected to alkali lye input mouth through first conveying pipeline.
6. A recycling apparatus according to claim 3, characterized in that: the lime solution feeding device is characterized by further comprising a lime solution feeding barrel, wherein a discharge port of the lime solution feeding barrel is connected to a calcium salt feeding port through a second conveying pipe.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921361046.0U CN210974184U (en) | 2019-08-21 | 2019-08-21 | Recovery unit of phosphorus in sewage plant second grade play water |
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| CN201921361046.0U CN210974184U (en) | 2019-08-21 | 2019-08-21 | Recovery unit of phosphorus in sewage plant second grade play water |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114772781A (en) * | 2022-04-21 | 2022-07-22 | 东南大学 | Recovery system and process for phosphorus microcrystals in sewage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114772781A (en) * | 2022-04-21 | 2022-07-22 | 东南大学 | Recovery system and process for phosphorus microcrystals in sewage |
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