CN210764911U - Resource utilization system for phosphorus in sludge - Google Patents
Resource utilization system for phosphorus in sludge Download PDFInfo
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- CN210764911U CN210764911U CN201921409278.9U CN201921409278U CN210764911U CN 210764911 U CN210764911 U CN 210764911U CN 201921409278 U CN201921409278 U CN 201921409278U CN 210764911 U CN210764911 U CN 210764911U
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 239000011574 phosphorus Substances 0.000 title claims abstract description 71
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 71
- 239000010802 sludge Substances 0.000 title description 64
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Substances [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 60
- 238000006243 chemical reaction Methods 0.000 claims abstract description 56
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 32
- 238000004062 sedimentation Methods 0.000 claims abstract description 30
- 239000003513 alkali Substances 0.000 claims abstract description 14
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 claims abstract description 12
- 239000002253 acid Substances 0.000 claims abstract description 12
- 239000001110 calcium chloride Substances 0.000 claims abstract description 12
- 229910001628 calcium chloride Inorganic materials 0.000 claims abstract description 12
- 239000000920 calcium hydroxide Substances 0.000 claims abstract description 12
- 229910001861 calcium hydroxide Inorganic materials 0.000 claims abstract description 12
- 150000003839 salts Chemical class 0.000 claims abstract description 11
- AXCZMVOFGPJBDE-UHFFFAOYSA-L calcium dihydroxide Chemical compound [OH-].[OH-].[Ca+2] AXCZMVOFGPJBDE-UHFFFAOYSA-L 0.000 claims abstract description 10
- 238000006386 neutralization reaction Methods 0.000 claims abstract description 5
- 239000007788 liquid Substances 0.000 claims description 11
- 239000007787 solid Substances 0.000 claims description 11
- 230000018044 dehydration Effects 0.000 claims description 9
- 238000006297 dehydration reaction Methods 0.000 claims description 9
- 230000001105 regulatory effect Effects 0.000 claims description 7
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical class [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims description 5
- 239000006227 byproduct Substances 0.000 abstract description 10
- 238000000605 extraction Methods 0.000 abstract description 4
- 239000000047 product Substances 0.000 abstract description 4
- 238000000746 purification Methods 0.000 abstract description 3
- 239000000243 solution Substances 0.000 description 80
- 239000002244 precipitate Substances 0.000 description 24
- 239000006228 supernatant Substances 0.000 description 24
- 229910019142 PO4 Inorganic materials 0.000 description 13
- 239000010452 phosphate Substances 0.000 description 13
- 238000001556 precipitation Methods 0.000 description 13
- DLYUQMMRRRQYAE-UHFFFAOYSA-N tetraphosphorus decaoxide Chemical compound O1P(O2)(=O)OP3(=O)OP1(=O)OP2(=O)O3 DLYUQMMRRRQYAE-UHFFFAOYSA-N 0.000 description 10
- 239000011575 calcium Substances 0.000 description 9
- 230000035484 reaction time Effects 0.000 description 8
- 239000001506 calcium phosphate Substances 0.000 description 7
- 229910000389 calcium phosphate Inorganic materials 0.000 description 7
- 235000011010 calcium phosphates Nutrition 0.000 description 7
- 238000001035 drying Methods 0.000 description 7
- 238000001914 filtration Methods 0.000 description 7
- QORWJWZARLRLPR-UHFFFAOYSA-H tricalcium bis(phosphate) Chemical compound [Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O QORWJWZARLRLPR-UHFFFAOYSA-H 0.000 description 7
- 229960004887 ferric hydroxide Drugs 0.000 description 6
- IEECXTSVVFWGSE-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Fe+3] IEECXTSVVFWGSE-UHFFFAOYSA-M 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 230000003472 neutralizing effect Effects 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- CKMXBZGNNVIXHC-UHFFFAOYSA-L ammonium magnesium phosphate hexahydrate Chemical compound [NH4+].O.O.O.O.O.O.[Mg+2].[O-]P([O-])([O-])=O CKMXBZGNNVIXHC-UHFFFAOYSA-L 0.000 description 3
- 239000012264 purified product Substances 0.000 description 3
- 229910052567 struvite Inorganic materials 0.000 description 3
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000000813 microbial effect Effects 0.000 description 2
- 239000010865 sewage Substances 0.000 description 2
- 239000001488 sodium phosphate Substances 0.000 description 2
- 229910000162 sodium phosphate Inorganic materials 0.000 description 2
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000855 fermentation Methods 0.000 description 1
- 239000003337 fertilizer Substances 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 229910000398 iron phosphate Inorganic materials 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 1
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 1
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 235000015816 nutrient absorption Nutrition 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 230000020477 pH reduction Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 1
- 239000002686 phosphate fertilizer Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Treatment Of Sludge (AREA)
Abstract
The utility model provides a resource utilization system of phosphorus in mud, including equalizing basin, the retort, dewatering device, neutralization tank, hydrogen peroxide reaction tank, ferric salt reaction tank, a sedimentation tank, alkali lye reaction tank, No. two sedimentation tanks, calcium chloride reaction tank, No. three sedimentation tanks, calcium hydroxide reaction tank, No. four sedimentation tanks, through dissolving out the phosphorus in with dilute acid solution with mud, the phosphorus of once deposiing obtains the purification product of phosphorus through the purification, the phosphorus of secondary sedimentation is as the by-product of phosphorus, the phosphorus in the mud is retrieved to the high efficiency, the extraction rate to the phosphorus is high, and the resource utilization degree of phosphorus-containing product is high.
Description
Technical Field
The utility model relates to a sludge treatment field especially relates to a resource utilization system of phosphorus in mud.
Background
Phosphorus resource is an irreplaceable nonmetallic mineral resource which is difficult to regenerate in the world, and is also an indispensable element for life bodies. At present, phosphorus resources in the world are in a shortage condition, and the phosphorus resources in the world can only be used for 60-130 years according to estimation of different authorities in the world. However, phosphorus resources have not only industrial and important application value, but also play a very important role in agriculture, medicine and biology.
The sludge of the sewage treatment plant contains a large amount of phosphorus, one part of the sludge is phosphorus in microbial cells in the sludge, the other part of the sludge is phosphorus carried by a phosphorus removal agent in the sewage treatment process, and the content of the phosphorus in the sludge accounts for 3-5% of the total amount of dry matters of the sludge. According to the development research report (2018) of sludge treatment and disposal industry in the world and China, it is shown that in 2017-2018, the sludge yield of the main economic bodies in the world is: about 3800 million tons in the United states, 4400 million tons in the European Union, 5500 million tons in China, and 1.37 million tons of accumulated sludge yield of three major economic bodies. Therefore, the recovery of phosphorus from sludge is beneficial to global sustainability.
The current sludge phosphorus recovery technology which is commonly used is to carry out anaerobic fermentation on sludge to release phosphorus, and then the phosphorus is reacted to generate struvite fertilizer. On one hand, the anaerobic phosphorus release efficiency is limited, most phosphorus still remains in sludge, resources are wasted greatly, and on the other hand, the nutrient absorption effect of plants on struvite is poor, so that the struvite is not an optimal phosphate fertilizer mode.
Disclosure of Invention
The utility model provides a resource utilization system of phosphorus in mud, the phosphorus in the mud is retrieved to the high efficiency to turn into its purification product of the high phosphorus of total phosphorus content and the low by-product of nevertheless still having other nutrient element's phosphorus of total phosphorus content, form the high phosphorus product of resource utilization rate.
The utility model adopts the technical proposal that:
the resource utilization method of phosphorus in sludge comprises the following steps:
the method comprises the following steps: and (3) dissolving out the phosphorus in the sludge: adjusting the solid content of the sludge solution to be 5-10%, enabling the sludge solution to have certain fluidity, adding a dilute acid solution into the sludge solution, adjusting the pH value of the sludge solution, dehydrating the sludge solution, performing next treatment on the dehydrated water, and neutralizing the dehydrated sludge;
step two: the recovery process of the purified product of phosphorus: adding hydrogen peroxide or ferric iron salt into the solution containing a large amount of phosphate radical, continuously adding NaOH solution after reaction, adjusting pH, elutriating the obtained precipitate after reaction, keeping the supernatant for later use, continuously adding NaOH solution into the elutriated precipitate, adjusting pH to obtain ferric hydroxide precipitate and phosphate radical-containing supernatant, adding CaCl into the supernatant2Elutriating, filtering and drying the obtained precipitate to obtain calcium phosphate;
step three: phosphorus byproduct recovery process: adding Ca (OH) into the supernatant of the second step2And (4) adjusting the pH value of the turbid solution, filtering and drying the precipitate after reaction to obtain a phosphorus byproduct.
Preferably, in the step one, after the dilute acid solution is added into the sludge solution, the pH value of the sludge solution is adjusted to 0-1.
Preferably, in the step one, the reaction time of the sludge solution and the dilute acid solution is 0.5-4 h.
Preferably, in the second step, the reaction time of adding hydrogen peroxide or the ferric salt into the solution is 10min to 30 min.
Preferably, in the second step, after the NaOH solution is added into the solution, the pH value is adjusted to 1.8-2.2.
Preferably, in the second step, the reaction time after the NaOH solution is added into the solution is 15 min-60 min.
Preferably, in the second step, after adding a NaOH solution into the precipitate, the pH is adjusted to 13-14.
Preferably, in the third step, the supernatant of the second step is added with Ca (OH)2And adjusting the pH of the turbid liquid to 5-6.
Preferably, in the third step, the supernatant of the second step is mixed with Ca (OH)2The reaction time of the turbid solution is 15-60 min.
Resource utilization system of phosphorus in mud includes: a regulating tank; the reaction tank is connected with the regulating tank and is provided with a dilute acid solution dosing tank; the dehydration device is connected with the reaction tank; the neutralization tank is connected with the solid outlet of the dehydration device and is provided with an alkali liquor dosing tank; the hydrogen peroxide reaction tank is connected with the liquid outlet of the dehydration device and is provided with a hydrogen peroxide dosing tank; the bottom end of the ferric salt reaction tank is connected with the bottom end of the hydrogen peroxide reaction tank and is provided with a ferric salt dosing tank; the top end of the first sedimentation tank is connected with the top end of the ferric salt reaction tank and is provided with an overflow weir; the alkali liquor reaction tank is connected with the solid outlet of the first sedimentation tank, is provided with a NaOH dosing tank and is provided with an overflow weir; the second sedimentation tank is connected with the alkali liquor reaction tank and is provided with an overflow weir; the calcium chloride reaction tank is connected with the liquid outlet of the second sedimentation tank and is provided with a calcium chloride dosing tank; the third sedimentation tank is connected with the calcium chloride reaction tank and is provided with an overflow weir; the calcium hydroxide reaction tank is connected with the liquid outlet of the first sedimentation tank and is provided with a calcium hydroxide dosing tank; and the fourth sedimentation tank is connected with the calcium hydroxide reaction tank and is provided with an overflow weir.
The utility model has the advantages that:
1. the extraction rate of phosphorus in the sludge is high. The sludge is chemically treated by dilute acid solution, on one hand, the permeability of microbial cells is damaged, so that a large amount of phosphorus in the cells is dissolved out, on the other hand, the bridging effect of phosphorus removal medicament floc is opened, so that chemical phosphorus in the sludge is converted into phosphate ions, the extraction efficiency of phosphorus in the sludge is greatly improved, and the extraction rate of phosphorus in the sludge reaches 95%.
2. The phosphorus content in the purified product of phosphorus is high. In the acidizing fluid after the sludge acidification treatment, the ionic components are complex, the precipitation process of phosphorus is adjusted, in the primary precipitation of phosphorus, iron phosphate is used as the main component, the total phosphorus pentoxide content is about 20%, the washed primary precipitation is redissolved by adding alkali to obtain a relatively pure sodium phosphate solution and ferric hydroxide precipitation, and then a calcium chloride solution is added into the sodium phosphate solution to finally obtain relatively pure calcium phosphate, wherein the total phosphorus pentoxide content in the calcium phosphate is about 52%.
3. And (4) completely recovering phosphorus resources. Acidifying the sludge, dissolving out a large amount of phosphorus and ammonia in a large amount of cells, wherein the solution obtained after primary phosphorus precipitation still contains some phosphorus which is not precipitated and a large amount of ammonia, adding alkali into the supernatant obtained after primary precipitation to obtain a phosphorus-containing byproduct, and the phosphorus content in the aqueous solution obtained after secondary phosphorus precipitation is less than 0.5mg/L and reaches the discharge standard.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic view of a resource utilization system for phosphorus in sludge according to the present invention.
In fig. 1: 1-a regulating reservoir; 21-a reaction tank; 22-dilute acid solution dosing tank; 3-a dewatering device; 41-neutralization tank; 42-an alkali liquor dosing tank; 51-hydrogen peroxide reaction tank; 52-a ferric iron salt reaction tank; 53-a sedimentation tank; 54-hydrogen peroxide dosing tank; a 55-ferric salt dosing tank; 61-an alkali liquor reaction tank; 62-a second sedimentation tank; 63-NaOH dosing tank; 71-a calcium chloride reaction tank; 72-sedimentation tank III; 73-calcium chloride dosing tank; 81-calcium hydroxide reaction tank; no. 82-IV sedimentation tank; 83-calcium hydroxide dosing tank.
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.
The resource utilization method of phosphorus in sludge comprises the following steps:
the method comprises the following steps: and (3) dissolving out the phosphorus in the sludge: adjusting the solid content of the sludge solution to be 5-10%, enabling the sludge solution to have certain fluidity, adding a dilute acid solution into the sludge solution, adjusting the pH value of the sludge solution, dehydrating the sludge solution, performing next treatment on the dehydrated water, and neutralizing the dehydrated sludge;
step two: the recovery process of the purified product of phosphorus: adding hydrogen peroxide or ferric iron salt into the solution containing a large amount of phosphate radical, continuously adding NaOH solution after reaction, adjusting pH, elutriating the obtained precipitate after reaction, keeping the supernatant for later use, continuously adding NaOH solution into the elutriated precipitate, adjusting pH to obtain ferric hydroxide precipitate and phosphate radical-containing supernatant, adding CaCl into the supernatant2Elutriating, filtering and drying the obtained precipitate to obtain calcium phosphate;
step three: phosphorus byproduct recovery process: adding Ca (OH) into the supernatant of the second step2And (4) adjusting the pH value of the turbid solution, filtering and drying the precipitate after reaction to obtain a phosphorus byproduct.
Preferably, in the step one, after the dilute acid solution is added into the sludge solution, the pH value of the sludge solution is adjusted to 0-1.
Preferably, in the step one, the reaction time of the sludge solution and the dilute acid solution is 0.5-4 h.
Preferably, in the second step, the reaction time of adding hydrogen peroxide or the ferric salt into the solution is 10min to 30 min.
Preferably, in the second step, after the NaOH solution is added into the solution, the pH value is adjusted to 1.8-2.2.
Preferably, in the second step, the reaction time after the NaOH solution is added into the solution is 15 min-60 min.
Preferably, in the second step, after adding a NaOH solution into the precipitate, the pH is adjusted to 13-14.
Preferably, in the third step, the supernatant of the second step is added with Ca (OH)2And adjusting the pH of the turbid liquid to 5-6.
Preferably, in the third step, the supernatant of the second step is mixed with Ca (OH)2The reaction time of the turbid solution is 15-60 min.
Resource utilization system of phosphorus in mud includes: a regulating tank 1; the reaction tank 21 is connected with the regulating tank 1 and is provided with a dilute acid solution dosing tank 22; the dehydration device 3 is connected with the reaction tank 21; a neutralization tank 41 connected with the solid outlet of the dehydration device 3 and provided with an alkali liquor dosing tank 42; a hydrogen peroxide reaction tank 51 connected with the liquid outlet of the dehydration device 3 and provided with a hydrogen peroxide dosing tank 54; a ferric salt reaction tank 52, the bottom end of which is connected with the bottom end of the hydrogen peroxide reaction tank 51 and is provided with a ferric salt dosing tank 55; a first sedimentation tank 53, the top end of which is connected with the top end of the ferric salt reaction tank 52 and is provided with an overflow weir; the alkali liquor reaction tank 61 is connected with the solid outlet of the first sedimentation tank 53, is provided with a NaOH dosing tank 63 and is provided with an overflow weir; a second sedimentation tank 62 connected with the alkali liquor reaction tank 61 and provided with an overflow weir; the calcium chloride reaction tank 71 is connected with the liquid outlet of the second sedimentation tank 62 and is provided with a calcium chloride dosing tank 73; a third sedimentation tank 72 connected with the calcium chloride reaction tank 71 and provided with an overflow weir; the calcium hydroxide reaction tank 81 is connected with the liquid outlet of the first sedimentation tank 53 and is provided with a calcium hydroxide dosing tank 83; and a fourth sedimentation tank 82 connected with the calcium hydroxide reaction tank 81 and provided with an overflow weir.
Example 1
Adjusting the solid content of the sludge solution to 5 percent to ensure that the sludge solution has certain fluidity, adding dilute hydrochloric acid into the sludge solution to adjust [ H ] in the sludge solution+]Reaction for 4 hours, dehydrating the sludge solution, and neutralizing the dehydrated sludge; adding excessive hydrogen peroxide into the solution with the phosphate radical concentration of 5400mg/L to react for 30min, further adding NaOH solution, adjusting pH =2.2, reacting for 30min, elutriating the obtained precipitate after the reaction, continuously adding NaOH solution into the elutriated precipitate, adjusting pH =13 to obtain ferric hydroxide precipitate and phosphate radical-containing supernatant, adding CaCl into the supernatant2Elutriating, filtering and drying the obtained precipitate to obtain calcium phosphate with the phosphorus pentoxide content of 46 percent; adding Ca (OH) into the supernatant after primary phosphorus precipitation2Turbid solution, adjusting pH =5, and reverseAnd (5) reacting for 15min to obtain a phosphorus-containing byproduct, wherein the concentration of phosphate radicals in the supernatant after secondary precipitation is less than 0.5 mg/L.
Example 2
Adjusting the solid content of the sludge solution to be 10%, enabling the sludge solution to have certain fluidity, adding dilute hydrochloric acid into the sludge solution, adjusting the pH =1 in the sludge solution, reacting for 0.5h, dehydrating the sludge solution, and neutralizing the dehydrated sludge; adding excessive ferric trichloride into the solution with phosphate radical concentration of 2100mg/L, reacting for 10min, further adding NaOH solution, adjusting pH =1.8, reacting for 15min, elutriating the obtained precipitate, adding NaOH solution into the elutriated precipitate, and adjusting [ OH ] to obtain [ OH ]]=1mol/L, obtaining ferric hydroxide precipitate and phosphate radical-containing supernatant, adding CaCl into the supernatant2Elutriating, filtering and drying the obtained precipitate to obtain calcium phosphate with the phosphorus pentoxide content of 44%; adding Ca (OH) into the supernatant after primary phosphorus precipitation2And (5) adjusting the pH value of the turbid solution to be =6, reacting for 60min to obtain a phosphorus-containing byproduct, wherein the concentration of phosphate radicals in the supernate after secondary precipitation is less than 0.5 mg/L.
Example 3
Adjusting the solid content of the sludge solution to be 8%, enabling the sludge solution to have certain fluidity, adding dilute sulfuric acid into the sludge solution, adjusting the pH =0.5 in the sludge solution, reacting for 2 hours, dehydrating the sludge solution, and neutralizing the dehydrated sludge; adding excessive ferric sulfate into the solution with phosphate radical concentration of 3300mg/L, reacting for 20min, further adding NaOH solution, adjusting pH =2.0, reacting for 30min, elutriating the obtained precipitate after reaction, continuously adding NaOH solution into the elutriated precipitate, adjusting pH =13.5 to obtain ferric hydroxide precipitate and phosphate radical-containing supernatant, adding CaCl into the supernatant2Elutriating, filtering and drying the obtained precipitate to obtain calcium phosphate with the phosphorus pentoxide content of 45%; adding Ca (OH) into the supernatant after primary phosphorus precipitation2And (4) adjusting the pH of the turbid solution to =5.5, reacting for 30min to obtain a phosphorus-containing byproduct, wherein the concentration of phosphate radicals in the supernatant after secondary precipitation is less than 0.5 mg/L.
Claims (1)
1. Resource utilization system of phosphorus in mud, its characterized in that includes: a regulating reservoir (1); the reaction tank (21) is connected with the regulating tank (1) and is provided with a dilute acid solution dosing tank (22); a dehydration device (3) connected to the reaction tank (21); a neutralization tank (41) which is connected with the solid outlet of the dehydration device (3) and is provided with an alkali liquor dosing tank (42); a hydrogen peroxide reaction tank (51) which is connected with the liquid outlet of the dehydration device (3) and is provided with a hydrogen peroxide dosing tank (54); a ferric iron salt reaction tank (52), the bottom end of which is connected with the bottom end of the hydrogen peroxide reaction tank (51) and is provided with a ferric iron salt dosing tank (55); a first sedimentation tank (53), the top end of which is connected with the top end of the ferric salt reaction tank (52) and is provided with an overflow weir; an alkali liquor reaction tank (61) which is connected with the solid outlet of the first sedimentation tank (53), is provided with a NaOH dosing tank (63) and is provided with an overflow weir; a second sedimentation tank (62) which is connected with the alkali liquor reaction tank (61) and is provided with an overflow weir; the calcium chloride reaction tank (71) is connected with the liquid outlet of the second sedimentation tank (62) and is provided with a calcium chloride dosing tank (73); a third sedimentation tank (72) which is connected with the calcium chloride reaction tank (71) and is provided with an overflow weir; the calcium hydroxide reaction tank (81) is connected with the liquid outlet of the first sedimentation tank (53) and is provided with a calcium hydroxide dosing tank (83); and the fourth sedimentation tank (82) is connected with the calcium hydroxide reaction tank (81) and is provided with an overflow weir.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110436723A (en) * | 2019-08-28 | 2019-11-12 | 天津壹新环保工程有限公司 | Resource utilization method and system for phosphorus in sludge |
| CN112079424A (en) * | 2020-09-08 | 2020-12-15 | 天津壹新环保工程有限公司 | Cyclic utilization system and process of phosphorus removal agent |
| CN112125483A (en) * | 2020-08-31 | 2020-12-25 | 同济大学 | Synchronous recovery processing method for nitrogen and phosphorus in high-solid anaerobic digestion sludge |
| CN114405980A (en) * | 2022-01-07 | 2022-04-29 | 中原环保股份有限公司 | Method for comprehensively recycling municipal sludge incineration slag |
-
2019
- 2019-08-28 CN CN201921409278.9U patent/CN210764911U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110436723A (en) * | 2019-08-28 | 2019-11-12 | 天津壹新环保工程有限公司 | Resource utilization method and system for phosphorus in sludge |
| CN112125483A (en) * | 2020-08-31 | 2020-12-25 | 同济大学 | Synchronous recovery processing method for nitrogen and phosphorus in high-solid anaerobic digestion sludge |
| CN112079424A (en) * | 2020-09-08 | 2020-12-15 | 天津壹新环保工程有限公司 | Cyclic utilization system and process of phosphorus removal agent |
| CN114405980A (en) * | 2022-01-07 | 2022-04-29 | 中原环保股份有限公司 | Method for comprehensively recycling municipal sludge incineration slag |
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