CN212425817U - Phosphorus recycling device - Google Patents
Phosphorus recycling device Download PDFInfo
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- CN212425817U CN212425817U CN202020997650.9U CN202020997650U CN212425817U CN 212425817 U CN212425817 U CN 212425817U CN 202020997650 U CN202020997650 U CN 202020997650U CN 212425817 U CN212425817 U CN 212425817U
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Abstract
The utility model discloses a phosphorus recycle device, including sludge hydrolysis device, dehydration processing apparatus, complex reaction device, blow and take off the device and deposit crystallization device, sludge hydrolysis device is connected with dehydration processing apparatus through first sludge pump, and dehydration processing apparatus is connected with complex reaction device, and complex reaction device with deposit crystallization device through the second sludge pump and be connected, complex reaction device adds the device with magnesium and is connected. The utility model discloses phosphorus recycle device can follow the high efficiency in the concentrated sludge and retrieve phosphorus and get rid of the heavy metal simultaneously, obtains the struvite product that is rich in phosphorus that can produce actual economic benefits.
Description
Technical Field
The utility model relates to a phosphorus recycle device belongs to phosphorus recovery processing field.
Background
Phosphorus is an indispensable nutrient element for growth of animals and plants, and is almost a unidirectional cycle in nature. Phosphorus is also an irreplaceable raw material in many industrial fields. Only a few countries in the world have phosphorite which can be economically exploited and contains less pollutants, and phosphorus will become rare substances in the next decades. It is estimated that worldwide reserves of phosphate rock can only be maintained for about 100 years. Meanwhile, phosphorus is an important factor of water eutrophication, and threatens the water environment safety and the drinking water safety.
The advanced treatment process of sewage is adopted in most municipal sewage plants in China, and 90% of phosphorus enters sludge after the advanced treatment. The Chinese sewage treatment capacity reaches 1.78 billion cubic meters per day, and 5000 million tons of sludge with 80 percent of water content is produced every year. Therefore, phosphorus recovery from sludge is an important way to mitigate water pollution and phosphorus resource shortage. At present, the main process for phosphorus recovery is struvite (MAP chemical formula: MgNH)4PO4·6H2O), and the reclaimed struvite is a good slow-release fertilizer and can be applied to agricultural production. However, municipal sludge accumulates a lot of heavy metals during sewage treatmentThe heavy metals and organic matters easily form chelate bodies, are mixed in phosphorus recovery products, are difficult to separate and are transmitted in a food chain, and finally harm human health. In view of this, research on equipment for efficiently recovering phosphorus from sludge and removing heavy metals has important application value for phosphorus recovery.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a phosphorus recycle device, it can follow the high efficiency recovery phosphorus in the mud, gets rid of the heavy metal in the mud simultaneously.
In order to solve the technical problem, the utility model discloses a following technical scheme: the utility model provides a phosphorus recycle device, includes sludge hydrolysis device, dehydration device, complex reaction device, blows and takes off the device and deposit the crystallization device, and sludge hydrolysis device is connected with dehydration device through first sludge pump, and dehydration device is connected with complex reaction device, and complex reaction device with deposit the crystallization device through second sludge pump and be connected, complex reaction device and magnesium add the device and be connected.
Among the aforementioned kind of phosphorus recycle device, the sludge hydrolysis device includes first reactor, sets up the first agitator in first reactor and sets up the pH valve detector in first reactor, and the detection electrode end of pH valve detector is located the stirring paddle leaf of first agitator top, and the bin outlet and the first sludge pump of first reactor are connected. A detection electrode end of the pH value detector is arranged above a stirring paddle of the first stirrer so as to ensure the accuracy of measured data after full stirring.
In the phosphorus recycling device, the dehydration treatment device includes a dehydrator, and the dehydrator is connected to the first sludge pump.
In the phosphorus recycling device, the complex reaction device comprises a second reactor, a second stirrer arranged in the second reactor and a pH detector arranged in the second reactor, wherein a detection electrode end of the pH detector is positioned above a stirring blade of the second stirrer, and a feed inlet of the second reactor is connected with a discharge outlet of the dehydrator.
In the phosphorus recycling device, the blowing-off device comprises a compression air compressor and an aeration head arranged at the bottom of the second reactor, and the aeration head is connected with the air compressor.
In the foregoing phosphorus recycling apparatus, the precipitation crystallization apparatus includes a precipitation tank and a dewatering tank, the precipitation tank is connected to the second sludge pump, the dewatering tank is connected to the precipitation tank, and a supernatant discharge port is provided on the precipitation tank.
In the phosphorus recovery and utilization apparatus, a polymer adding device is provided in a pipe between the dehydrator and the first sludge pump.
In the phosphorus recycling device, the first stirrer is provided with a foam removing device.
The phosphorus recycling device further comprises a first acid adding device, wherein the first acid adding device is connected with the first reactor; the sludge conveying pipe is connected with a sludge inlet at the bottom of the first reactor; the device also comprises a second acid adding device, and the second acid adding device is connected with the second reactor.
The method for recycling phosphorus by using the phosphorus recycling device comprises the following steps: step SO1 hydrolysis acidification sludge;
adding concentrated sludge of a municipal sewage plant into a first reactor as raw sludge, simultaneously adding sulfuric acid, opening a first stirrer to fully mix the raw sludge with the sulfuric acid, and stopping adding the raw sludge and the sulfuric acid when the pH value measured by a pH value detector reaches 4; wherein the concentration of the sulfuric acid is 98 percent;
step S02: dehydrating and hydrolyzing the acidified sludge;
when the pH value measured by the pH value detector reaches 4, starting a first sludge pump, adding a polymer into a pipeline between the first sludge pump and a desliming machine, fully mixing sludge subjected to hydrolytic acidification with the polymer, and then dehydrating the sludge added with the polymer in a dehydrator to obtain sludge filtrate and solid sludge cakes; the dewatered sludge filtrate is taken as a reclaimed material to be continuously treated;
step S03: complexing the sludge filtrate;
introducing the sludge filtrate as a reclaimed material into a second reactor, adding 50% citric acid, continuously stirring by a second stirrer, and reacting for 15-30 minutes after adding the citric acid to form a complex; the stoichiometric ratio of the amount of the added citric acid with the concentration of 50 percent to the sum of the metal ions contained in the sludge filtrate is 1: 1; the metal ions contained in the sludge filtrate are iron ions, aluminum ions, calcium ions and magnesium ions;
step S04: adding solid magnesium oxide into the sludge filtrate after the complexing treatment
After the complexing treatment, adding solid magnesium oxide powder into a second reactor; the stoichiometric ratio of magnesium to phosphorus is 1.5: 1; the dissolving time after adding the solid magnesium oxide powder is 30-60 minutes to obtain complex mixed liquor;
step S05: blowing-off treatment of complex mixed liquor
Adding compressed air at the bottom of the second reactor, blowing off carbon dioxide from the complex mixed solution to ensure that the pH value of the complex mixed solution is 8, and reacting in an alkaline environment: mg (magnesium)2++NH4 ++HPO4 2-+6H2O＝MgNH4PO4·6H2O+H+Reacting and crystallizing to generate small crystal struvite;
step S06: obtaining a recovered product;
after the pH value of the complex mixed liquid is determined to be 8 by the pH detector and the complex mixed liquid is stable, the complex mixed liquid is introduced into the sedimentation tank by the second sludge pump, the complex mixed liquid in the sedimentation tank continuously reacts and crystallizes for 1-2 hours, the small crystal struvite in the complex mixed liquid continuously forms large crystal struvite, then precipitate is obtained, the precipitate is led out to the dewatering box from the bottom of the sedimentation tank, the dewatering box is placed in the air statically, the precipitate in the dewatering box is dried, and a gray powder struvite product is obtained after the drying treatment is finished. The utility model discloses get back to municipal sewage factory again through the supernatant that the sedimentation tank obtained among the device and supply with the utilization.
Compared with the prior art, the utility model discloses a sludge hydrolysis unit carries out hydrolysis to concentrated sludge, utilizes the dehydration device to carry out dehydration to the mud after the hydrolytic acidification, makes phosphate ion in the mud filtrating obtained and metal ion that contains take place the complex reaction through the complex reaction unit, utilizes the blow-off device to obtain acid complex mixed liquid, finally obtains the recovery product guano stone product through the precipitation crystallization device; the phosphorus recycling device can efficiently recycle phosphorus from the concentrated sludge and remove heavy metals, and the phosphorus recycling rate of the device is more than 50% (relative to the total phosphorus content in the concentrated sludge of the municipal sewage plant); utilize the utility model discloses phosphorus recycle device finally acquires rich phosphorus's struvite product, the utility model discloses not only can effectively get rid of the heavy metal in the concentrated sludge, more can obtain the struvite product that can produce actual economic benefits.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, together with the description of the invention
The examples are used together to explain the invention and do not constitute an undue limitation on the invention. In the drawings:
fig. 1 is a schematic structural diagram of an embodiment of the present invention.
Reference numerals: 1-sludge hydrolysis device, 101-first reactor, 102-first stirrer, 103-pH value detector, 2-dehydration treatment device, 201-dehydrator, 3-complex reaction device, 301-second reactor, 302-second stirrer, 303-pH detector, 4-magnesium adding device, 5-blowing device, 501-air compressor, 502-aeration head, 6-precipitation crystallization device, 601-sedimentation tank, 602-dehydration tank, 7-first sludge pump, 8-second sludge pump, 9-polymer adding device, 10-first acidification device, 11-sludge conveying pipe and 12-second acidification device.
The present invention will be further described with reference to the accompanying drawings and the detailed description.
Detailed Description
In order to make the technical solution of the present invention better understood, the following description is given with reference to the accompanying drawings in the embodiments of the present invention, and the technical solution in the embodiments of the present invention is clearly and completely described. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts shall belong to the protection scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Embodiment 1 of the utility model: the utility model provides a phosphorus recycle device, includes sludge hydrolysis device 1, dehydration treatment device 2, complex reaction device 3, blows and takes off device 5 and deposit crystallization device 6, sludge hydrolysis device 1 is connected with dehydration treatment device 2 through first sludge pump 7, dehydration treatment device 2 is connected with complex reaction device 3, complex reaction device 3 with through second sludge pump 8 with deposit crystallization device 6 and be connected, complex reaction device 3 adds 4 with magnesium and is connected.
The utility model discloses phosphorus recycle device's working process: concentrated sludge treated by a municipal sewage plant is conveyed into a first reactor 101 of a sludge hydrolysis device 1, sulfuric acid with the concentration of 98% is added into the first reactor 101, the sludge and the sulfuric acid added into the first reactor 101 at the same time are fully stirred by a first stirrer 102, metal phosphate in the sludge is redissolved into phosphate and metal ions by the added sulfuric acid, and the phosphate treated at the redissolution and the phosphate existing in the sludge can be used as raw materials for producing the bird droppings. In the process of hydrolyzing and acidifying the sludge, the pH value of the mixture of the concentrated sludge and the sulfuric acid is detected in real time by using a pH value detector 103 arranged in a first reactor 101, and when the pH value detected by the pH value detector is 4, a first sludge pump 7 is started to ensure that the sludge after hydrolysis and acidification enters into dehydration through the first sludge pump 7The machine 201 dehydrates the sludge added with the polymer by using the dehydrator 201 to obtain sludge filtrate and solid sludge cake containing heavy metals, thereby achieving the purpose of removing the heavy metals, the sludge filtrate dehydrated by the dehydrator 201 is conveyed to the second reactor 301, citric acid with the concentration of 50% is added into the second reactor 301, the sludge filtrate and the citric acid are fully stirred by the second stirrer 302 arranged in the second reactor 301, and the citric acid and metal ions (mainly iron ions, aluminum ions, calcium ions and magnesium ions) contained in the sludge filtrate are subjected to a complexing reaction to form a complex, so that the metal ions can be prevented from generating metal phosphate again when the pH value is subsequently increased. Adding solid magnesium oxide powder into the second reactor 301 after the complexing reaction is carried out for 15-30 minutes to ensure that enough magnesium ions can react with ammonium ions in the sludge filtrate, introducing compressed air in an air compressor 501 into the second reactor 301 after the solid magnesium oxide is added for 30-60 minutes and the solid magnesium oxide is fully dissolved, increasing the pH value of the complexing mixed solution in a blowing-off treatment mode, detecting the pH value of the complexing mixed solution in the second reactor 301 by a pH detector 303, and starting to react Mg when the pH value displayed by the pH detector 303 is 72++NH4 ++HPO4 2-+6H2O＝MgNH4PO4·6H2O+H+Thereby, small crystal struvite begins to be generated, when the pH value detected by the pH detector 303 is 8 and reaches a stable value, the second sludge pump 8 is started, the complexing mixed liquid is conveyed into the sedimentation tank 601 through the second sludge pump 8, and Mg is contained in the sedimentation tank 6012++NH4 ++HPO4 2-+6H2O＝MgNH4PO4·6H2O+H+And (3) continuously reacting for 1-2 hours, crystallizing the small-crystal struvite into large-crystal struvite to obtain a precipitate, allowing the precipitate to come out of the bottom of the sedimentation tank 601 and then enter a dewatering box 602, and performing drying treatment in the dewatering box 602 to finally obtain a phosphorus-rich gray powder struvite product.
Claims (8)
1. The utility model provides a phosphorus recycle device, its characterized in that, includes sludge hydrolysis device (1), dehydration device (2), complex reaction device (3), blows off device (5) and deposits crystallization device (6), sludge hydrolysis device (1) is connected with dehydration device (2) through first sludge pump (7), dehydration device (2) are connected with complex reaction device (3), complex reaction device (3) with through second sludge pump (8) with deposit crystallization device (6) be connected, complex reaction device (3) add device (4) with magnesium and be connected.
2. The phosphorus recycling device according to claim 1, wherein the sludge hydrolysis device (1) comprises a first reactor (101), a first stirrer (102) arranged in the first reactor (101), and a pH value detector (103) arranged in the first reactor (101), wherein a detection electrode end of the pH value detector (103) is positioned above a stirring paddle of the first stirrer (102), and a discharge port of the first reactor (101) is connected with a first sludge pump (7).
3. The phosphorus recovery apparatus according to claim 2, wherein the dehydration treatment apparatus (2) comprises a dehydrator (201), and the dehydrator (201) is connected to the first sludge pump (7).
4. The phosphorus recycling device according to claim 3, wherein the complexing reaction device (3) comprises a second reactor (301), a second stirrer (302) arranged in the second reactor (301), and a pH detector (303) arranged in the second reactor (301), wherein a detection electrode end of the pH detector (303) is positioned above a stirring blade of the second stirrer (302), and a feeding hole of the second reactor (301) is connected with a discharging hole of the dehydrator (201); a polymer adding device (9) is arranged on a pipeline between the dehydrator (201) and the first sludge pump (7).
5. The phosphorus recycling device according to claim 4, wherein the blowing-off device (5) comprises a compression air compressor (501) and an aeration head (502) arranged at the bottom of the second reactor (301), and the aeration head (502) is connected with the compression air compressor (501).
6. The phosphorus recycling device according to claim 5, wherein the precipitation crystallization device (6) comprises a sedimentation tank (601) and a dewatering tank (602), the sedimentation tank (601) is connected with the second sludge pump (8), the dewatering tank (602) is connected with the sedimentation tank (601), and a supernatant discharge port is arranged on the sedimentation tank (601).
7. A phosphorus recycling apparatus according to claim 6, further comprising a first acid adding device (10), wherein said first acid adding device (10) is connected to the first reactor (101); the system also comprises a sludge conveying pipe (11), wherein the sludge conveying pipe (11) is connected with a sludge inlet at the bottom of the first reactor (101); the device also comprises a second acid adding device (12), wherein the second acid adding device (12) is connected with the second reactor (301).
8. A phosphorus recovery and utilization apparatus according to claim 6, wherein the first stirrer (102) is provided with a foam removing device.
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| CN202020997650.9U CN212425817U (en) | 2020-06-03 | 2020-06-03 | Phosphorus recycling device |
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| CN202020997650.9U CN212425817U (en) | 2020-06-03 | 2020-06-03 | Phosphorus recycling device |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111484214A (en) * | 2020-06-03 | 2020-08-04 | 华电水务科技股份有限公司 | Phosphorus recycling device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111484214A (en) * | 2020-06-03 | 2020-08-04 | 华电水务科技股份有限公司 | Phosphorus recycling device and method |
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