CN113461202B - High-phosphorus and high-calcium magnesium recycling treatment method - Google Patents
High-phosphorus and high-calcium magnesium recycling treatment method Download PDFInfo
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- CN113461202B CN113461202B CN202110705053.3A CN202110705053A CN113461202B CN 113461202 B CN113461202 B CN 113461202B CN 202110705053 A CN202110705053 A CN 202110705053A CN 113461202 B CN113461202 B CN 113461202B
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- 239000011574 phosphorus Substances 0.000 title claims abstract description 91
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 91
- 238000000034 method Methods 0.000 title claims abstract description 40
- 238000004064 recycling Methods 0.000 title claims abstract description 10
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 64
- 238000003756 stirring Methods 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 34
- 239000002351 wastewater Substances 0.000 claims abstract description 31
- 239000002699 waste material Substances 0.000 claims abstract description 27
- 239000012141 concentrate Substances 0.000 claims abstract description 19
- 239000000843 powder Substances 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 17
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 15
- 239000011575 calcium Substances 0.000 claims abstract description 15
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 14
- 238000004062 sedimentation Methods 0.000 claims abstract description 14
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000011777 magnesium Substances 0.000 claims abstract description 9
- 229910052749 magnesium Inorganic materials 0.000 claims abstract description 9
- 238000001556 precipitation Methods 0.000 claims abstract description 9
- 238000006243 chemical reaction Methods 0.000 claims abstract description 8
- 238000004519 manufacturing process Methods 0.000 claims abstract description 8
- 229910000147 aluminium phosphate Inorganic materials 0.000 claims abstract description 7
- 239000003337 fertilizer Substances 0.000 claims abstract description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 12
- 239000012535 impurity Substances 0.000 claims description 12
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 229920002401 polyacrylamide Polymers 0.000 claims description 10
- 238000001914 filtration Methods 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 7
- 239000003513 alkali Substances 0.000 claims description 6
- 239000002253 acid Substances 0.000 claims description 5
- 150000001875 compounds Chemical class 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- ZFXVRMSLJDYJCH-UHFFFAOYSA-N calcium magnesium Chemical compound [Mg].[Ca] ZFXVRMSLJDYJCH-UHFFFAOYSA-N 0.000 claims description 4
- 229910001425 magnesium ion Inorganic materials 0.000 claims description 3
- 239000007787 solid Substances 0.000 claims description 2
- 238000005189 flocculation Methods 0.000 abstract description 4
- 230000016615 flocculation Effects 0.000 abstract description 4
- 239000008394 flocculating agent Substances 0.000 abstract description 3
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 239000002893 slag Substances 0.000 description 10
- 239000002002 slurry Substances 0.000 description 6
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 2
- 229910019142 PO4 Inorganic materials 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 238000010170 biological method Methods 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 2
- 239000010452 phosphate Substances 0.000 description 2
- 239000002367 phosphate rock Substances 0.000 description 2
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- JLVVSXFLKOJNIY-UHFFFAOYSA-N Magnesium ion Chemical compound [Mg+2] JLVVSXFLKOJNIY-UHFFFAOYSA-N 0.000 description 1
- 229940037003 alum Drugs 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 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
- C02F9/00—Multistage 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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- 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
- C02F2001/007—Processes including a sedimentation step
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention relates to a high-phosphorus and high-calcium magnesium wastewater recycling treatment method. Aiming at high-phosphorus and high-calcium magnesium wastewater, firstly adding phosphorus concentrate powder to prepare low-concentration phosphorus ore pulp, then adjusting the ore pulp to be slightly alkaline, promoting the occurrence of precipitation reaction by stirring, and finally adding a flocculating agent to perform flocculation sedimentation. The obtained high-phosphorus waste residue can be used for producing phosphoric acid or fertilizer and the like, and clean water obtained by treatment can be recycled for production of phosphorus chemical enterprises. The method provided by the invention can effectively reduce the contents of calcium, magnesium and phosphorus in the wastewater, and realize the effective recycling of phosphorus element.
Description
Technical Field
The invention relates to the field of wastewater treatment, in particular to a high-phosphorus high-calcium magnesium wastewater recycling treatment method.
Background
In the production process of phosphorus chemical enterprises, high phosphorus, high calcium and magnesium wastewater is often generated, and if the wastewater is discharged into slow-flowing water bodies such as lakes, rivers and the like, the water bodies can be eutrophicated, the water quality is deteriorated, and the environment is damaged. At present, the method for removing phosphorus from sewage at home and abroad mainly comprises two major types, namely a biological method and a chemical method. Biological methods mainly aim at low-concentration and organic-state phosphorus-containing wastewater, and aim at high-phosphorus wastewater produced by phosphorus chemical enterprises, the high-phosphorus wastewater is removed by adopting a chemical method, and insoluble precipitate is generated by adding chemical precipitants (including lime, alum, ferric chloride, a mixture of lime and ferric chloride and the like) and phosphate in the wastewater, so that phosphorus separation is realized. The method has simple and mature process, but the obtained waste residue can not be recycled, and the waste of phosphorus resources is caused.
Disclosure of Invention
The invention aims to provide a treatment method for recycling high-phosphorus and high-calcium magnesium wastewater, which has the advantages of high chemical precipitation efficiency, good flocculation precipitation effect and thorough phosphorus and calcium magnesium removal, the obtained waste residue can be recycled, and the reuse water can be directly returned to a workshop for production.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
(1) Mixing the wastewater to be treated with phosphorus concentrate powder to prepare low-concentration phosphorus ore pulp;
(2) Regulating the pH value of the low-concentration phosphate concentrate slurry obtained in the step (1) to 9-9.5, stirring for 10min, and carrying out precipitation reaction;
(3) Mixing the treated phosphorite slurry obtained in the step (2) with a flocculant, and stirring for flocculation to obtain flocculated ore slurry;
(4) Settling the flocculated ore pulp liquid obtained in the step (3) to obtain high-phosphorus waste residue and pretreatment backwater.
(5) And (3) regulating the pH value of the pretreatment backwater obtained in the step (4) to be 6.5-7.5, so as to obtain reuse water.
Preferably, the amount of the substances of calcium and magnesium in the wastewater in the step (1) should be slightly larger than the amount of the substances of phosphorus. The calcium and magnesium deficient part can be supplemented by calcium salt or high hardness waste water.
Preferably, the phosphorus concentrate powder P in the step (1) 2 O 5 The content is more than 30 percent, the content of-0.074 mm is less than 80 percent, and the concentration of phosphorite slurry is 10-15 percent.
Preferably, the alkali used for adjusting the pH in the step (2) comprises one or more of sodium hydroxide and potassium hydroxide.
Preferably, the ratio of the dosage of the flocculating agent to the volume of water in the step (3) is 8-15 mg/L, and the flocculation sedimentation time is 15min.
The invention provides a high phosphorus and high calcium magnesium wastewater recycling treatment method, which comprises the steps of firstly adding phosphorus concentrate powder to prepare low-concentration phosphorus ore pulp, then adjusting the ore pulp to be slightly alkaline, promoting the occurrence of precipitation reaction through strong stirring, finally adding a flocculating agent, and standing for sedimentation. The obtained high-phosphorus waste residue can be used for producing phosphoric acid or fertilizer, and clear water obtained by treatment can be recycled for production of phosphorus chemical enterprises. The process flow is simple, the raw materials are low in price and easy to obtain, no redundant waste is generated, and the obtained waste residue can be recycled.
Detailed description of the preferred embodiments
Example 1
Treatment of wastewater produced by phosphorus chemical enterprises
( Impurities include TP 2000ppm,CaO 1120ppm,MgO 910ppm,pH 4.5, total nitrogen 43.2ppm, etc.; wherein the amount of calcium magnesium ion species is slightly higher than the amount of phosphorus species )
(1) Mixing the wastewater with phosphorus concentrate powder to prepare low-concentration ore pulp with the mass concentration of 12%, and injecting the low-concentration ore pulp into a No. 1 stirring barrel, wherein the phosphorus concentrate powder is 75% in the content of-0.074 mm, and P is added into the low-concentration ore pulp 2 O 5 The content is 31%;
(2) Adding 30% sodium hydroxide solution into a No. 1 stirring barrel by using an alkali liquor dosing pump, adjusting the pH value of ore pulp of the No. 1 stirring barrel to 9-9.5, stirring for 10min, and carrying out precipitation reaction;
(3) Overflowing the ore pulp treated by the stirring barrel No. 1 into a stirring barrel No. 2, adding polyacrylamide into the stirring barrel No. 2 by using a flocculant dosing pump, and stirring for 10min to obtain flocculated ore pulp; wherein the dosage of the polyacrylamide is 8-15 mg/l;
(4) Pumping the flocculated ore pulp obtained in the step (3) into a sedimentation tank, and carrying out sedimentation treatment for 15min to obtain pretreated backwater and high-phosphorus waste residues.
(5) And (3) adding 10 mass percent of dilute sulfuric acid into the pretreatment backwater obtained in the step (4) by using an acid dosing pump, and adjusting the pH value to 6.5-7.5 to obtain reuse water.
(6) And (3) filtering the high-phosphorus waste residue obtained in the step (4) by using a plate-frame filter, and delivering the obtained waste residue to wet-process phosphoric acid or common calcium, compound fertilizer and other products.
The recycled water obtained by the method contains TP 19ppm, caO 2.0ppm and MgO 3.7ppm. High phosphorus slag P 2 O 5 The content is 33%.
Example 2
Treatment of wastewater produced by phosphorus chemical enterprises
(impurities include TP 2000ppm,CaO 1140ppm,MgO 900ppm,pH 4.5, total nitrogen 43.2ppm, etc.)
The operation steps are the same as in example 1, and the pH value of the slurry in step (2) is controlled to be 10.5-11.0.
The recycled water obtained by the method contains TP 15ppm, caO 1.5ppm and MgO 2.0ppm. High phosphorus slag P 2 O 5 The content is 32.3%. However, at the pH value, the flocculating pulp in the step (4) is difficult to settle, and the subsequent filtering operation is influenced; and the consumption of sodium hydroxide and sulfuric acid is increased, so that the cost is increased.
Example 3
Treatment of wastewater produced by phosphorus chemical enterprises
(impurities include TP 2000ppm,CaO 1100ppm,MgO 900ppm,pH 4.5, total nitrogen 43.2ppm, etc.)
The operation steps are the same as in example 1, and the pH value of the slurry in step (2) is controlled to be 5.5-6.5.
The recycled water obtained by the method contains TP 846ppm, caO 315ppm and MgO 474ppm. High phosphorus slag P 2 O 5 The content of the total phosphorus, calcium and magnesium in the obtained reuse water is high, and the reuse cannot be realized.
Example 4
(impurities include TP 2000ppm,CaO 1120ppm,MgO 910ppm,pH 4.5, total nitrogen 43.2ppm, etc.)
The procedure is as in example 1, wherein the pulp concentration in step (1) is adjusted to 8%.
The recycled water obtained by the method contains TP 18ppm, caO 2.1ppm and MgO 3.4ppm. High phosphorus slag P 2 O 5 The content was 33.2%. Settling of the flocculated ore pulp in the step (4) is difficult, and the subsequent filtering operation is affected.
Example 5
(impurities include TP 2000ppm,CaO 1080ppm,MgO 940ppm,pH 4.5, total nitrogen 43.2ppm, etc.)
The procedure is as in example 1, wherein the pulp concentration in step (1) is adjusted to 20%.
The recycled water obtained by the method contains TP 20ppm, caO 2.2ppm and MgO3.7ppm. High phosphorus slag P 2 O 5 The content is 32.7%. The consumption of concentrate powder is increased, and the cost is increased.
Example 6
(impurities include TP 2000ppm,CaO 1220ppm,MgO 940ppm,pH 4.5, total nitrogen 43.2ppm, etc.)
The procedure is as in example 1, wherein the phosphorus concentrate powder of step (1) is 95% of the content of-0.074 mm.
The recycled water obtained by the method contains TP 20ppm, caO 3.5 ppm and MgO 5.7ppm. High phosphorus slag P 2 O 5 The content is 32.5%, but the sedimentation in the step (4) is difficult due to the fineness of the concentrate powder, so that the filtering pressure in the step (6) is high, and a large amount of fine suspended matters exist in the reuse water, so that the quality of the reuse water is affected.
Example 7
(impurities include TP 2100ppm,CaO 1620ppm,MgO 410ppm,pH 4.5, total nitrogen 43.2ppm, etc., the sum of the amounts of calcium and magnesium ion species being greater than the amount of phosphorus species)
The procedure is as in example 1.
The recycled water obtained by the method contains 17.5ppm of TP, 4.7 ppm of CaO and 2.2ppm of MgO. High phosphorus slag P 2 O 5 The content was 32.6%.
Example 8
The operation procedure is as in example 1, step (1) phosphorus concentrate powder P 2 O 5 The content is 22%.
The recycled water obtained by the method contains TP 15ppm, caO 2.4ppm and MgO 4.2ppm. High phosphorus slag P 2 O 5 The content is 23.8%. The obtained reuse water has better quality, but the content of phosphorus in waste residue is too low to be directly used for downstream production.
Example 9
Treatment of wastewater produced by phosphorus chemical enterprises
( The impurities include: TP 3500ppm,CaO 960ppm,MgO 730ppm, total nitrogen 43.2ppm, pH 4.7, etc., the amount of phosphorus species is greater than the sum of the amounts of calcium and magnesium species )
(1) Mixing the wastewater with phosphorus concentrate powder to prepare low-concentration ore pulp with the mass concentration of 10%, and injecting the low-concentration ore pulp into a No. 1 stirring barrel, wherein the phosphorus concentrate powder is 75% in the content of-0.074 mm, and P is added into the low-concentration ore pulp 2 O 5 The content is 30 percent;
(2) Adding 30% sodium hydroxide solution into a No. 1 stirring barrel by using an alkali liquor dosing pump, adjusting the pH value of ore pulp of the No. 1 stirring barrel to 9-9.5, stirring for 10min, and carrying out precipitation reaction;
(3) Overflowing the ore pulp treated by the stirring barrel No. 1 into a stirring barrel No. 2, adding polyacrylamide into the stirring barrel No. 2 by using a flocculant dosing pump, and stirring for 10min to obtain flocculated ore pulp; wherein the dosage of the polyacrylamide is 10mg/l;
(4) Pumping the flocculated ore pulp obtained in the step (3) into a sedimentation tank, carrying out sedimentation treatment for 15min, and carrying out pretreatment on backwater and high-phosphorus waste residues.
(5) And (3) adding 10 mass percent of dilute sulfuric acid into the pretreatment backwater obtained in the step (4) by using an acid dosing pump, and adjusting the pH value to 6.5-7.5 to obtain reuse water.
(6) And (3) filtering the high-phosphorus waste residue obtained in the step (4) by using a plate-frame filter, and delivering the obtained waste residue to wet-process phosphoric acid or common calcium, compound fertilizer and other products.
The recycled water TP 1152ppm, caO 3.6ppm and MgO 2.8ppm obtained by the method. High phosphorus slag P 2 O 5 The content of the phosphorus in the recycled water is 31.8 percent, and the total phosphorus content of the recycled water is too high.
Example 10
Treatment of wastewater produced by phosphorus chemical enterprises
( The impurities include: TP 3500ppm,CaO 950ppm,MgO 720ppm, total nitrogen 43.2ppm, pH 4.7, etc., the total phosphorus species being greater than the sum of the amounts of calcium and magnesium species )
The procedure is as in example 7, with the addition of 3g/l of calcium chloride solids in step (1).
The recycled water TP obtained by the method is 19.6ppm, caO is 2.6ppm and MgO is 2.4ppm. High phosphorus slag P 2 O 5 Content 32.5%
The foregoing description of the preferred embodiment of the present invention is merely illustrative of and not limiting to the embodiment, and it should be noted that modifications and variations can be made by persons skilled in the art without departing from the inventive concept, and these fall within the scope of the present invention.
Claims (3)
1. The method for recycling the high-phosphorus and high-calcium magnesium wastewater is characterized by comprising the following steps of:
treating wastewater generated by phosphorus chemical enterprises: impurities include TP 2000ppm,CaO 1120ppm,MgO 910ppm,pH 4.5, total nitrogen 43.2ppm; wherein the amount of calcium magnesium ion species is slightly higher than the amount of phosphorus species;
(1) Mixing the wastewater with phosphorus concentrate powder to prepare low-concentration ore pulp with the mass concentration of 12%, and injecting the low-concentration ore pulp into a No. 1 stirring barrel, wherein the phosphorus concentrate powder is 75% in the content of-0.074 mm, and P is added into the low-concentration ore pulp 2 O 5 The content is 31%;
(2) Adding 30% sodium hydroxide solution into a No. 1 stirring barrel by using an alkali liquor dosing pump, adjusting the pH value of ore pulp of the No. 1 stirring barrel to 9-9.5, stirring for 10min, and carrying out precipitation reaction;
(3) Overflowing the ore pulp treated by the stirring barrel No. 1 into a stirring barrel No. 2, adding polyacrylamide into the stirring barrel No. 2 by using a flocculant dosing pump, and stirring for 10min to obtain flocculated ore pulp; wherein the dosage of the polyacrylamide is 8-15 mg/L;
(4) Pumping the flocculated ore pulp obtained in the step (3) into a sedimentation tank, and carrying out sedimentation treatment for 15min to obtain pretreated backwater and high-phosphorus waste residues;
(5) Adding 10 mass percent of dilute sulfuric acid into the pretreatment backwater obtained in the step (4) by using an acid dosing pump, and adjusting the pH value to 6.5-7.5 to obtain reuse water;
(6) Filtering the high-phosphorus waste residue obtained in the step (4) by using a plate-frame filter, and delivering the obtained waste residue to wet-process phosphoric acid or common calcium, compound fertilizer and other products for production;
the recycled water TP 19ppm, caO 2.0ppm, mgO 3.7ppm and high-phosphorus waste residue P obtained by the method 2 O 5 The content is 33%.
2. The method for recycling the high-phosphorus and high-calcium magnesium wastewater is characterized by comprising the following steps of: treating wastewater generated by phosphorus chemical enterprises: the impurities include: TP 3500ppm,CaO 960ppm,MgO 730ppm, total nitrogen 43.2ppm, pH 4.7, phosphorus species in an amount greater than the sum of the amounts of calcium and magnesium species;
(1) Mixing the wastewater with phosphorus concentrate powder to prepare low-concentration ore pulp with the mass concentration of 10%, and injecting the low-concentration ore pulp into a No. 1 stirring barrel, wherein the phosphorus concentrate powder is 75% in the content of-0.074 mm, and P is added into the low-concentration ore pulp 2 O 5 The content is 30 percent;
(2) Adding 30% sodium hydroxide solution into a No. 1 stirring barrel by using an alkali liquor dosing pump, adjusting the pH value of ore pulp of the No. 1 stirring barrel to 9-9.5, stirring for 10min, and carrying out precipitation reaction;
(3) Overflowing the ore pulp treated by the stirring barrel No. 1 into a stirring barrel No. 2, adding polyacrylamide into the stirring barrel No. 2 by using a flocculant dosing pump, and stirring for 10min to obtain flocculated ore pulp; wherein the dosage of the polyacrylamide is 10mg/L;
(4) Pumping the flocculated ore pulp obtained in the step (3) into a sedimentation tank, carrying out sedimentation treatment for 15min, and waiting for pretreatment of backwater and high-phosphorus waste residues;
(5) Adding 10 mass percent of dilute sulfuric acid into the pretreatment backwater obtained in the step (4) by using an acid dosing pump, and adjusting the pH value to 6.5-7.5 to obtain reuse water;
(6) Filtering the high-phosphorus waste residue obtained in the step (4) by using a plate-frame filter, and delivering the obtained waste residue to wet-process phosphoric acid or common calcium and compound fertilizer products for production;
the recycled water TP 1152ppm, caO 3.6ppm, mgO 2.8ppm and high-phosphorus waste residue P obtained by the method 2 O 5 The content of the phosphorus in the recycled water is 31.8 percent, and the total phosphorus content of the recycled water is too high.
3. The method for recycling the high-phosphorus and high-calcium magnesium wastewater is characterized by comprising the following steps of: treating wastewater generated by phosphorus chemical enterprises: the impurities include: TP 3500ppm,CaO 950ppm,MgO 720ppm, total nitrogen 43.2ppm, pH 4.7, total phosphorus species in an amount greater than the sum of the amounts of calcium and magnesium species;
(1) Mixing the wastewater with phosphorus concentrate powder to prepare low-concentration ore pulp with the mass concentration of 10%, and injecting the low-concentration ore pulp into a No. 1 stirring barrel, wherein the phosphorus concentrate powder is 75% in the content of-0.074 mm, and P is added into the low-concentration ore pulp 2 O 5 The content is 30 percent, and 3g/L of chloridizing is added inCalcium solids;
(2) Adding 30% sodium hydroxide solution into a No. 1 stirring barrel by using an alkali liquor dosing pump, adjusting the pH value of ore pulp of the No. 1 stirring barrel to 9-9.5, stirring for 10min, and carrying out precipitation reaction;
(3) Overflowing the ore pulp treated by the stirring barrel No. 1 into a stirring barrel No. 2, adding polyacrylamide into the stirring barrel No. 2 by using a flocculant dosing pump, and stirring for 10min to obtain flocculated ore pulp; wherein the dosage of the polyacrylamide is 10mg/L;
(4) Pumping the flocculated ore pulp obtained in the step (3) into a sedimentation tank, carrying out sedimentation treatment for 15min, and waiting for pretreatment of backwater and high-phosphorus waste residues;
(5) Adding 10 mass percent of dilute sulfuric acid into the pretreatment backwater obtained in the step (4) by using an acid dosing pump, and adjusting the pH value to 6.5-7.5 to obtain reuse water;
(6) Filtering the high-phosphorus waste residue obtained in the step (4) by using a plate-frame filter, and delivering the obtained waste residue to wet-process phosphoric acid or common calcium and compound fertilizer products for production;
the recycled water TP 19.6ppm, caO 2.6ppm, mgO 2.4ppm and high-phosphorus waste residue P obtained by the method 2 O 5 The content is 32.5%.
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