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Method for recovering phosphorus in phosphorus chemical wastewater by using struvite production technology

A production process, phosphorus chemical technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. The effect of less and less interference

Inactive Publication Date: 2012-09-26
HUBEI FORBON TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Lime milk neutralizes and precipitates to produce a large amount of sludge, which needs to be filtered and dried, the treatment is more complicated, and the removal rate of phosphorus in wastewater is low

Method used

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  • Method for recovering phosphorus in phosphorus chemical wastewater by using struvite production technology
  • Method for recovering phosphorus in phosphorus chemical wastewater by using struvite production technology
  • Method for recovering phosphorus in phosphorus chemical wastewater by using struvite production technology

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The discharge of wastewater from a phosphogypsum slag yard in a chemical plant is 1200m3 / d. The phosphorus content in the wastewater is 4200mg / l, the fluorine content is 825mg / l, and the pH is 2.4. First, the wastewater from the phosphogypsum slag yard is passed through a primary sedimentation tank to remove impurities Precipitation, the treated wastewater is collected in the first collection tank; the wastewater in the first collection tank adopts the first-stage quicklime method to remove inorganic fluoride ions in the wastewater, adjusts the pH of the wastewater to 4, and removes the fluorine in the wastewater in the form of calcium fluoride precipitation. The removal rate of fluorine reaches 85%, and the treated wastewater is collected in the second collection tank. The wastewater in the second collection tank uses cation exchange equipment to remove inorganic cations in the wastewater, and the treated ion-exchange wastewater is collected in the third collection tank...

Embodiment 2

[0025] Example 2: Except that the molar ratio of magnesium / nitrogen / phosphorus added was 1.5:1.0:1, the others were the same as in Example 1, and about 7.4 t of crystalline magnesium ammonium phosphate granular fertilizer was produced. The phosphorus concentration in the effluent water of the reactor is 1.1mg / l, and the fluoride is 4mg / l, which can be directly discharged up to the standard.

Embodiment 3

[0026] Example 3: Except that the added magnesium / nitrogen / phosphorus molar ratio is 1.0:1.5:1, the others are the same as in Example 1, and about 7.3 tons of crystalline magnesium ammonium phosphate granular fertilizer are produced. The phosphorus concentration in the effluent water of the reactor is 1.0mg / l, and the fluoride is 6mg / l, which can be directly discharged up to the standard.

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Abstract

The invention relates to a method for recovering phosphorus in phosphorus chemical wastewater by using a struvite production technology. The method is carried out according to the following steps of: firstly carrying out preliminary sedimentation on the phosphorus chemical wastewater, removing impurity precipitation in the wastewater, and collecting the processed wastewater in a first collecting tank; removing inorganic fluoride ion in wastewater in the first collecting tank by adopting a first-level quick lime method, and collecting the processed wastewater into a second collecting tank; removing inorganic cations in the wastewater in the second collecting tank via a cation exchange device, and collecting the processed ion exchange wastewater into a third collecting tank; finally adjusting pH value of the ion exchange wastewater to 7-9 in a struvite reactor by alkali liquor and adding magnesium source and nitrogen source, wherein the molar ratio of magnesium / phosphorus is 1.0-1.5; and the molar ratio of nitrogen / phosphorus is 1.0-1.5; and generating a magnesium ammonium phosphate granulated fertilizer in a crystalline state in the reactor. The water from the struvite reactor achieves the secondary standard of the national wastewater discharge standard and can be directly reused in a phosphorus chemical production system or discharged up to the standard.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a method for recovering phosphorus in phosphorus chemical wastewater by using a struvite production process. The phosphorus in phosphorus chemical wastewater is recovered in the form of ammonium magnesium phosphate slow-release fertilizer. Background technique [0002] The content of fluorine and phosphorus in phosphorus chemical industry wastewater is very high. Phosphorus, ammonia nitrogen and organic matter in wastewater are the main reasons for eutrophication of water bodies, pollution of rivers and lakes, water pollution of offshore waters and flooding of red tides. Especially the phosphogypsum slag field wastewater has the characteristics of high acidity, strong corrosion, complex impurity ions, high phosphorus and fluorine content, etc., and has strong destructive power to the environment. [0003] At present, phosphorus chemical manufacturers mostly use lime milk neutr...

Claims

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Application Information

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IPC IPC(8): C02F9/04C05B17/00
Inventor 沙淮丽王仁宗宋功武刘裕
Owner HUBEI FORBON TECH
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