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Process for removing phosphorus from phosphorus water by using quantitative crystalline limestone and gypsum

A technology that is rich in phosphorus and water body, applied in the field of water pollution control, can solve the problems of high operating cost, high cost and harsh operating conditions, and achieve the effect of convenient use and water body optimization.

Inactive Publication Date: 2010-09-08
JIANGSU POLYTECHNIC UNIVERSITY
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AI Technical Summary

Problems solved by technology

[0005] ① The recovery method of ammonium magnesium phosphate and calcium phosphate minerals is mainly used for the recovery of phosphorus in the process of removing phosphorus from industrial wastewater and urban domestic sewage, but it cannot recover eutrophic water bodies in nature (such as rural distributed domestic sewage, phosphorus-enriched scenic spots) Phosphorus removal and recycling in water bodies)
[0006] ②Phosphorus removal (recovery of phosphorus) in the form of magnesium ammonium phosphate is accomplished by adding chemical reagents such as MgCl. The disadvantage is that the operating cost is very high, and it is required to operate under the background of a relatively high pH value (pH>9) ( This is impossible in natural water bodies)
[0007] ③ Phosphorus removal (recovery of phosphorus) in the form of calcium phosphate is done by adding Na(OH), Ca(OH) 2 Such as chemical reagents to complete, not only the cost is high, but also the problem of demanding operating conditions, it is difficult to carry out large-scale production and operation of natural phosphorus-rich water
[0008] ④The above methods have not yet achieved real quantitative treatment, and the maturity of the process needs to be further developed
"A method for removing phosphorus from eutrophic water or sewage by natural minerals (application number: 200810020886.0)" and "a quantitative application method for phosphorus removal and recovery of phosphorus from phosphorus-rich waters by natural minerals (application number: 200810020883.7)" invented by Zhang Hong et al. , although there is a laboratory solution to deal with phosphorus-rich water, it has not been corrected according to the results of the pilot test, and there are technical obstacles to practical application
The specific process of "quantitative application process of natural minerals for phosphorus removal in phosphorus-rich water (application number: 2008102341448)" invented by Zhang Hong et al. is fully operable in practical application; and further research has been carried out, and the actual applicable range is wider. However, in nature, the reserve of calcite is much smaller than that of crystalline limestone, and the market price of the former is obviously higher than that of the latter

Method used

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  • Process for removing phosphorus from phosphorus water by using quantitative crystalline limestone and gypsum
  • Process for removing phosphorus from phosphorus water by using quantitative crystalline limestone and gypsum
  • Process for removing phosphorus from phosphorus water by using quantitative crystalline limestone and gypsum

Examples

Experimental program
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Effect test

Embodiment 1

[0025] Take 10g of mixed mineral powder with a ratio of 4:1 (mass ratio of crystalline limestone / anhydrite) (the particle size of crystalline limestone is 800 mesh, and the particle size of gypsum is 800 mesh), and put it into a 200mL Erlenmeyer flask Add 100 mL of a solution with an initial phosphorus concentration of 1000 mg / L, adjust the pH to 7, put it into a constant temperature oscillator, set the rotation speed at 50 rpm, and the temperature at 30 ° C. After 12 hours of reaction, take its supernatant test. Then, remove the supernatant in the Erlenmeyer flask, dry the residual mixed mineral powder in the Erlenmeyer flask, then add 100 mL of a solution with an initial phosphorus concentration of 1000 mg / L, and repeat the experiment under the above conditions until it removes phosphorus (Recovery of phosphorus) until the effect is low. The final total amount of effective phosphorus removal is 298.75 mg, and the effective phosphorus removal amount corresponding to 1 g of g...

Embodiment 2

[0027] Take 10g of mixed mineral powder with a ratio of 9:1 (mass ratio of crystalline limestone / anhydrite) (the particle size of crystalline limestone is 800 mesh, and the particle size of gypsum is 500 mesh), and put it into a 200mL Erlenmeyer flask Add 100mL of a solution with an initial phosphorus concentration of 100g / L, adjust the pH to 6, put it into a constant temperature oscillator, set the rotation speed at 150 rpm, and the temperature at 25°C. After 10 hours of reaction, take its supernatant test. Then, remove the supernatant in the Erlenmeyer flask, dry the residual mixed mineral powder in the Erlenmeyer flask, then add 100 mL of a solution with an initial phosphorus concentration of 100 mg / L, and repeat the experiment under the above conditions until it removes phosphorus (Recovery of phosphorus) until the effect is low. The final total amount of effective phosphorus removal is 29.82 mg, and the effective phosphorus removal amount corresponding to 1 g of gypsum i...

Embodiment 3

[0029] Take 15g of mixed mineral powder with a ratio of 14:1 (mass ratio of crystalline limestone / anhydrite) (the particle size of crystalline limestone is g00 mesh, and the particle size of gypsum is 600 mesh), and put it into a 200mL conical flask Add 100mL of a solution with an initial phosphorus concentration of 50mg / L, adjust the pH to 6, put it into a constant temperature oscillator, set the speed at 150 rpm, and the temperature at 25°C. After 10 hours of reaction, take the supernatant test. Then, remove the supernatant in the Erlenmeyer flask, dry the residual mixed mineral powder in the Erlenmeyer flask, then add 100 mL of a solution with an initial phosphorus concentration of 50 mg / L, and repeat the experiment under the above conditions until it removes phosphorus (Recovery of phosphorus) until the effect is low. The final total amount of effective phosphorus removal is 19.76 mg, and the effective phosphorus removal amount corresponding to 1 g of gypsum is 19.76 mg (...

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Abstract

The invention provides a process for removing phosphorus and recycling the phosphorus from phosphorus water or sewage by using quantitative natural mineral. The process comprises the following steps: weighting crystalline limestone powder and gypsum powder, with grain size of 150 to 800 meshes, mixing the powder with a weight ratio of 4:1 to 14:1; reacting for 1 to 12 hours at 15 to 30 DEG C in a solution having an initial phosphorus concentration of 1000mg / L to 2mg / L; keeping the range of efficiently removed phosphorus in 1g gypsum being (0.1*CP) mg to (0.9*CP) mg; adding hard gypsum powder after lowering the phosphorus removing effect in the mixed mineral so as to keep the range of efficiently removed phosphorus in 1g gypsum being (0.15*CP) mg to (2*CP) mg (CP is the value of the initial phosphorus concentration (mg / L) of the solution). The process of the invention can be applied to removing phosphorus and recycling the phosphorus from phosphorus water such as city domestic sewage, industrial sewage, scattered domestic sewage in village, nutritive lake, big, middle and small nutritive landscape water, and the like.

Description

technical field [0001] The invention belongs to the field of water pollution control, and particularly refers to a quantitative application method for repeatedly using a mixture of natural minerals in a specific ratio in the process of removing phosphorus and recovering phosphorus in phosphorus-rich water or sewage. Background technique [0002] Phosphorus is the main inducer of water eutrophication, so in the process of dealing with the increasingly serious global eutrophication problem, the first thing to pay attention to is the control of phosphorus. [0003] In developed countries, the treatment of phosphorus in sewage is very important, especially the recovery and utilization of phosphorus in the treatment of industrial wastewater and urban domestic sewage; MgNH 4 PO 4 6H 2 O, commonly known as struvite or MAP) and calcium phosphate technology. For example, the Treviso sewage treatment plant in Italy installed a MAP crystallization recovery device on the sludge dewa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58
Inventor 张宏翟佳喻鹏辉
Owner JIANGSU POLYTECHNIC UNIVERSITY
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