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Industrial high-concentration phosphorus-containing wastewater treatment method

A treatment method and high-concentration technology, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve phosphorus resource waste, secondary pollution, lime usage and slag production Large quantity and other problems, to achieve good effect, recovery of phosphorus resources, and simple process

Inactive Publication Date: 2014-10-08
HUBEI FORBON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for wastewater such as phosphogypsum with high content of phosphorus, fluorine and calcium, there are certain problems in the current lime treatment method: the amount of lime used and the amount of slag produced are relatively large, and the solid waste formed after treatment generally needs to be landfilled. It is easy to cause secondary pollution; the most important thing is that in this treatment method, a large amount of phosphorus and calcium in the wastewater combine to form calcium phosphate, resulting in a great waste of phosphorus resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] (1) The phosphorus content is 0.15% (in P 2 o 5 2L of phosphorus-containing waste water with a fluorine content of 0.01%, a calcium content of 0.1%, and a pH of 2.86 was added to the reactor, and the temperature of the reactor was controlled to be 30°C. %magnesia slurry adjusts the pH of the waste water to 4.5, stops stirring after 10 minutes of reaction, and leaves standstill;

[0033] (2) After standing still, discharge the fluorine-containing sludge formed at the bottom of the reactor, then start stirring, add a mass concentration of 10% magnesium hydroxide slurry to the supernatant, adjust the pH of the system to 8.0, and stop stirring after 10 minutes of reaction , stand still;

[0034] (3) After adding the precipitating agent, add polyaluminum to the final clear liquid and stir it, then let it stand still. After analysis and determination, the P content of the clear liquid after treatment is 1.8ppm, the F content is 3.2ppm, and the Ca content is 14.3ppm, which c...

Embodiment 2

[0036] (1) 0.94% phosphorus content, 0.052% fluorine content, 0.22% calcium content, and 2.45 pH of phosphogypsum slag field phosphorus-containing wastewater 3L are added to the reactor, and the temperature of the reactor is controlled to be 40°C. Under the action of stirring, add 10% magnesite slurry to adjust the pH of the wastewater to 5.0, stop stirring after 15 minutes of reaction, and let stand;

[0037] (2) After standing still, discharge the fluorine-containing sludge formed at the bottom of the reactor, then start stirring, add magnesium hydroxide slurry liquid with a mass concentration of 10% in the supernatant, adjust the pH of the system to 8.2, and stop after 15 minutes of reaction stir, stand still;

[0038] (3) After adding the precipitating agent, the final clear liquid is stirred with polyferron and then left to stand. After analysis and determination, the P content of the treated clear liquid is 3.2ppm, the F content is 3.9ppm, and the Ca content is 22.5ppm, ...

Embodiment 3

[0040] (1) Add 2L of phosphogypsum washing wastewater with a phosphorus content of 1.64%, a fluorine content of 0.12%, a calcium content of 0.28%, and a pH of 2.12 into the reactor, and control the temperature of the reactor to 50°C under constant stirring Adding magnesium carbonate slurry with a mass concentration of 10% to adjust the pH of the wastewater to 5.5, stop stirring after 30 minutes of reaction, and let stand;

[0041](2) After standing still, discharge the fluorine-containing sludge formed at the bottom of the reactor, then start stirring, add a sodium hydroxide solution with a mass concentration of 10% in the supernatant, adjust the pH of the system to be 8.5, stop stirring after 30 minutes of reaction, stand still;

[0042] (3) After adding the precipitating agent, add polyaluminum to the final clear liquid, stir it, and let it stand still. After analysis and determination, the P content of the clear liquid after treatment is 5.3 ppm, the F content is 5.8 ppm, a...

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Abstract

The invention discloses an industrial high-concentration phosphorus-containing wastewater treatment method. The method comprises the following steps: adding a fluorine removal agent to high-concentration acidic phosphorus-containing wastewater with the P by P2O5 content of 0.15-2.2%, the F content of 0.01-0.35% and the Ca content of 0.1-0.45% to adjust the pH value of the wastewater to 4.5-6.5, allowing obtained wastewater to stand, and discharging formed fluorine-containing sludge; continuously adding a precipitating agent to the obtained upper layer clear liquid to adjust the pH value of the wastewater to 8.0-9.0, converting P to a magnesium phosphate precipitate, flocculating the obtained clear liquid to realize standard reaching emission or factory reuse; and dissolving the magnesium phosphate precipitate in fertilizer-grade phosphoric acid to obtain a P and Mg-containing mixed liquid, and carrying out metric N source addition to make struvite. The fluorine removal agent is magnesium oxide, magnesium carbonate, magnesian marble or dolomite; and the precipitating agent is magnesium hydroxide or sodium hydroxide. The wastewater treatment method has the advantages of simple process flow, good fluorine and calcium effects, and maximal recovery of the P resource on the premise that standard reaching of emitted water is guaranteed.

Description

technical field [0001] The invention relates to the fields of chemical technology and water treatment, in particular to a method for treating phosphorus chemical wastewater and recovering phosphorus. Background technique [0002] As a raw material for the phosphorus chemical industry, phosphate rock generally contains 3-4% fluorine, so that fluorine will be generated in all links of phosphorus chemical production, and phosphogypsum wastewater contains a large amount of fluorine. Fluorine is an element that is toxic to organisms and the natural environment. Therefore, the products of the phosphorus chemical industry have strict requirements on the fluorine content. At the same time, wastewater such as phosphogypsum contains a large amount of phosphorus, which is an essential element for the growth and development of animals and plants. Without phosphorus, there will be no life. Phosphorus, as a non-renewable resource, has been exploited excessively in recent years. Data show...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C01B25/45C02F101/10C02F101/14
Inventor 王瑞王仁宗王应宗刘裕李江鹏
Owner HUBEI FORBON TECH
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