CN110078039B - Method and device for preparing feed-grade calcium hydrophosphate in low-concentration phosphorus-containing wastewater step manner - Google Patents
Method and device for preparing feed-grade calcium hydrophosphate in low-concentration phosphorus-containing wastewater step manner Download PDFInfo
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- CN110078039B CN110078039B CN201910483493.1A CN201910483493A CN110078039B CN 110078039 B CN110078039 B CN 110078039B CN 201910483493 A CN201910483493 A CN 201910483493A CN 110078039 B CN110078039 B CN 110078039B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B25/00—Phosphorus; Compounds thereof
- C01B25/16—Oxyacids of phosphorus; Salts thereof
- C01B25/26—Phosphates
- C01B25/32—Phosphates of magnesium, calcium, strontium, or barium
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Abstract
The invention discloses a method and a device for preparing feed-grade calcium hydrophosphate in steps from low-concentration phosphorus-containing wastewater, which comprises four steps of: (1) Carrying out primary treatment on low-concentration phosphorus-containing wastewater, and allowing clear liquid to enter a secondary reaction; (2) Adding calcium hydroxide to control the pH value to be 5.6-6.2 for secondary reaction, settling to obtain a feed-grade calcium hydrophosphate product, and allowing supernatant to enter into tertiary reaction; (3) And (3) regulating the pH value to 2-4, adding calcium hydroxide for reaction, controlling the pH value to 5.6-6.0, settling to obtain a feed-grade calcium hydrophosphate product, and allowing the supernatant to enter the next stage. (4) Calcium hydroxide is added to control the pH value to be 11-13, the settled solid enters a first reaction tank to be used as a raw material of primary reaction after being concentrated, and the pH value of clear liquid is adjusted to be between 6 and 9 to be discharged. The method and the device can improve the phosphorus yield by 5 percent and reduce the unit consumption of raw materials.
Description
Technical Field
The invention relates to the field of low-concentration phosphorus-containing wastewater treatment production, in particular to a method and a device for preparing feed-grade calcium hydrophosphate in steps from low-concentration phosphorus-containing wastewater.
Background
At present, a secondary lime acid-alkali neutralization method is mostly adopted in the treatment process of high-concentration acidic wastewater containing phosphorus and fluorine. And a large amount of sewage slag is generated after the wastewater is treated, and the current sewage slag can only be used as part of additives for phosphate fertilizer after being piled up by a slag dam or dried.
However, none of these methods can thoroughly utilize the sewage and slag, and especially, a large amount of phosphorus resources contained in the slag not only causes waste of resources, but also may cause environmental pollution.
Disclosure of Invention
The invention aims to optimize the defects of the prior art and provides a method and a device for preparing feed-grade calcium hydrophosphate in a gradient way from low-concentration phosphorus-containing wastewater so as to improve the phosphorus yield and reduce the unit consumption of lime raw materials.
The technical scheme of the invention is as follows: a method for preparing feed-grade calcium hydrophosphate from low-concentration phosphorus-containing wastewater in a gradient way comprises four steps of treatment: (1) Adding low-concentration phosphorus-containing wastewater into calcium hydroxide for primary treatment, conveying the treated slag to a slag field, and allowing clear liquid to enter a secondary reaction; (2) In the second stage reaction, adding proper calcium hydroxide to control the pH value to be 5.6-6.2, carrying out sedimentation treatment after reacting for 1-2 hours, and enabling the settled solid to be a feed-grade calcium hydrophosphate product, entering a drying system, and enabling supernatant to enter a third reaction stage; (3) In the third reaction stage, the pH value is regulated to 2-4, then calcium hydroxide is added for the third treatment, the pH value is controlled to be 5.6-6.0, the settled solid is a feed-grade calcium hydrophosphate product, and the feed-grade calcium hydrophosphate product enters a drying system, and the supernatant fluid enters the next stage. (4) Adding calcium hydroxide to carry out the fourth step of treatment, controlling the pH value to be 11-13, settling the slurry, concentrating the settled solid, then entering a first reaction tank to be used as a raw material of the first reaction or used as other raw materials, adjusting the pH value of clear liquid to be 6-9 to carry out the discharge, wherein the external discharge index of phosphorus is 0.2mg/l, and fluorine is below 5mg/l, which is far lower than the national discharge standard.
A device for preparing feed-grade calcium hydrophosphate from low-concentration phosphorus-containing wastewater in a stepped manner comprises a first-stage reaction tank, a first sedimentation tank, a second-stage reaction tank, a second sedimentation tank, a third-stage reaction tank, a third sedimentation tank, a fourth sedimentation tank, a drying system and a pipeline, wherein the inlet of the first-stage reaction tank is connected with a low-concentration phosphorus-containing wastewater pipe, the outlet pipeline of the first-stage reaction tank is connected with the inlet of the first sedimentation tank, the outlet of the first sedimentation tank is connected with the inlet of the second-stage reaction tank, the outlet pipeline of the second-stage reaction tank is connected with the inlet of the second sedimentation tank, the outlet pipeline of the third-stage reaction tank is connected with the inlet of the third sedimentation tank, the outlet of the third sedimentation tank is connected with the inlet of the fourth sedimentation tank, and the outlet of the fourth-stage reaction tank is connected with the inlet of the fourth sedimentation tank; the fourth settling tank is connected to the first-stage reaction tank through a pipeline; the first settling tank is connected to a slag field through a pipeline; the second settling tank and the third settling tank are connected to the drying system through pipelines.
In the device for preparing the feed-grade calcium hydrophosphate in the low-concentration phosphorus-containing wastewater step by step, the primary reaction tank, the secondary reaction tank, the tertiary reaction tank and the quaternary reaction tank are all provided with pH meters and charging ports.
The method of the invention provides the idea of preparing the feed-grade calcium hydrophosphate in steps from the phosphorus-containing wastewater, and simultaneously, the method is correspondingly optimized on the basis of the original device, has low modification cost, improves the phosphorus yield by about 5 percent after implementation, and reduces the raw material unit consumption.
Drawings
FIG. 1 is a schematic flow chart of the present invention;
FIG. 2 is a schematic diagram of the structure of the present invention;
in the figure: 1-primary reaction tank, 2-primary sedimentation tank, 3-secondary reaction tank, 4-secondary sedimentation tank, 5-tertiary reaction tank, 6-third sedimentation tank, 7-quaternary reaction tank, 8-fourth sedimentation tank and 9-slag field; 10-drying system.
Detailed Description
A method for preparing feed-grade calcium hydrophosphate from low-concentration phosphorus-containing wastewater in a gradient way comprises four steps of treatment: (1) Adding low-concentration phosphorus-containing wastewater into calcium hydroxide for primary treatment, conveying the treated slag to a slag field, and allowing clear liquid to enter a secondary reaction; (2) In the second stage reaction, adding proper calcium hydroxide to control the pH value to be 5.6-6.2, carrying out sedimentation treatment after reacting for 1-2 hours, and enabling the settled solid to be a feed-grade calcium hydrophosphate product, entering a drying system, and enabling supernatant to enter a third reaction stage; (3) In the third reaction stage, the pH value is regulated to 2-4, then calcium hydroxide is added for the third treatment, the pH value is controlled to be 5.6-6.0, the settled solid is a feed-grade calcium hydrophosphate product, and the feed-grade calcium hydrophosphate product enters a drying system, and the supernatant fluid enters the next stage. (4) Adding calcium hydroxide to carry out the fourth step of treatment, controlling the pH value to be 11-13, settling the slurry, concentrating the settled solid, then entering a first reaction tank to be used as a raw material of the first reaction, adjusting the pH value of clear liquid to be 6-9 to carry out external discharge, wherein the external discharge index of phosphorus is 0.2mg/l, and fluorine is below 5mg/l, which is far lower than the national discharge standard.
A device for preparing feed-grade calcium hydrophosphate from low-concentration phosphorus-containing wastewater in a stepped manner comprises a first-stage reaction tank 1, a first sedimentation tank 2, a second-stage reaction tank 3, a second sedimentation tank 4, a third-stage reaction tank 5, a third sedimentation tank 6, a fourth-stage reaction tank 7, a fourth sedimentation tank 8, a drying system 10 and pipelines, wherein the inlet of the first-stage reaction tank 1 is connected with a low-concentration phosphorus-containing wastewater pipe, the outlet pipeline of the first-stage reaction tank 1 is connected with the inlet of the first sedimentation tank 2, the outlet of the first sedimentation tank 2 is connected with the inlet of the second-stage reaction tank 3, the outlet pipeline of the second sedimentation tank 3 is connected with the inlet of the second sedimentation tank 4, the outlet of the second sedimentation tank 4 is connected with the inlet of the third-stage reaction tank 5, the outlet of the third sedimentation tank 5 is connected with the inlet of the fourth-stage reaction tank 7, and the outlet of the fourth sedimentation tank 7 is connected with the inlet of the fourth sedimentation tank 8; the fourth settling tank 8 is connected to the first-stage reaction tank 1 by a pipeline; said first settler 2 is piped to a slag field 9; the second settling tank 4 and the third settling tank 6 are connected to the drying system 10 through pipes.
In the device for preparing the feed-grade calcium hydrophosphate in the low-concentration phosphorus-containing wastewater step by step, the primary reaction tank 1, the secondary reaction tank 3, the tertiary reaction tank 5 and the quaternary reaction tank 7 are all provided with pH meters and charging ports.
Claims (2)
1. A method for preparing feed-grade calcium hydrophosphate by using low-concentration phosphorus-containing wastewater in a gradient manner is characterized by comprising four steps of treatment: (1) Adding low-concentration phosphorus-containing wastewater into calcium hydroxide for primary treatment, conveying the treated slag to a slag field, and allowing clear liquid to enter a secondary reaction; (2) In the second stage reaction, adding proper calcium hydroxide to control the pH value to be 5.6-6.2, carrying out sedimentation treatment after reacting for 1-2 hours, and enabling the settled solid to be a feed-grade calcium hydrophosphate product, entering a drying system, and enabling supernatant to enter a third reaction stage; (3) In the third reaction stage, the pH value is firstly regulated to 2-4, then calcium hydroxide is added for the third treatment, the pH value is controlled to be 5.6-6.0, the settled solid is a feed-grade calcium hydrophosphate product, and the feed-grade calcium hydrophosphate product enters a drying system, and the supernatant fluid enters the next stage; (4) Adding calcium hydroxide to carry out the fourth step of treatment, controlling the pH value to be 11-13, settling the slurry, concentrating the settled solid, then entering a first reaction tank to be used as a raw material of a first-stage reaction or used as other raw materials, adjusting the pH value of clear liquid to be 6-9 to carry out external drainage, wherein the external drainage index phosphorus is 0.2mg/l, and fluorine is less than 5 mg/l;
the device used in the method comprises a first-stage reaction tank (1), a first sedimentation tank (2), a second-stage reaction tank (3), a second sedimentation tank (4), a third-stage reaction tank (5), a third sedimentation tank (6), a fourth-stage reaction tank (7), a fourth sedimentation tank (8), a drying system (10) and pipelines, wherein the inlet of the first-stage reaction tank (1) is connected with a low-concentration phosphorus-containing wastewater pipe, the outlet pipeline of the first-stage reaction tank (1) is connected with the inlet of the first sedimentation tank (2), the outlet of the first sedimentation tank (2) is connected with the inlet of the second-stage reaction tank (3), the outlet pipeline of the second-stage reaction tank (3) is connected with the inlet of the second sedimentation tank (4), the outlet pipeline of the third-stage reaction tank (5) is connected with the inlet of the third sedimentation tank (6), the outlet of the third sedimentation tank (6) is connected with the inlet of the fourth-stage reaction tank (7), and the outlet of the fourth-stage reaction tank (7) is connected with the inlet of the fourth sedimentation tank (8); the fourth settling tank (8) is connected to the first-stage reaction tank (1) through a pipeline; the first settling tank (2) is connected to a slag field (9) through a pipeline; the second settling tank (4) and the third settling tank (6) are connected to a drying system (10) through pipelines.
2. The method for preparing feed-grade calcium hydrophosphate in steps from low-concentration phosphorus-containing wastewater according to claim 1, which is characterized in that the primary reaction tank (1), the secondary reaction tank (3), the tertiary reaction tank (5) and the quaternary reaction tank (7) are all provided with pH meters and charging ports.
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| CN201910483493.1A CN110078039B (en) | 2019-06-04 | 2019-06-04 | Method and device for preparing feed-grade calcium hydrophosphate in low-concentration phosphorus-containing wastewater step manner |
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| CN201910483493.1A CN110078039B (en) | 2019-06-04 | 2019-06-04 | Method and device for preparing feed-grade calcium hydrophosphate in low-concentration phosphorus-containing wastewater step manner |
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| CN110078039B true CN110078039B (en) | 2023-09-22 |
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| CN115180602B (en) * | 2022-07-05 | 2023-05-02 | 生态环境部南京环境科学研究所 | Preparation method for preparing calcium hydrophosphate by using phosphorus-containing wastewater |
| CN115108541A (en) * | 2022-07-14 | 2022-09-27 | 瓮福（集团）有限责任公司 | Method for recycling ultralow-concentration phosphorus-containing wastewater |
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| ZA200002638B (en) * | 2000-05-26 | 2001-01-31 | Jan Christoffel De Waal | The production of dicalcium phosphate or monocalcium phosphate. |
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