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Method for removing and recycling phosphorus from phosphorus-rich water bodies or sewage by using natural mineral mixture

A technology of natural minerals and mixtures, applied in the field of water pollution control, can solve the problems of phosphorus removal and recycling, high operating costs, harsh operating conditions, etc., and achieve the effect of water body optimization and convenient use

Inactive Publication Date: 2011-11-16
GUILIN UNIVERSITY OF TECHNOLOGY
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  • Claims
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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 be used for eutrophic water bodies (such as eutrophic lake water bodies, rural distributed domestic sewage, etc.) , phosphorus-rich water in scenic spots) to remove and recycle phosphorus
[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 Ca(OH) 2 , NaOH and other 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
[0009] In my country, many scholars have studied phosphorus removal and phosphorus recycling from different angles, such as Wang Huizhen, Wang Shaogui. Research on phosphorus recovery from sewage plants in the form of calcium phosphate salt. China Water Supply and Drainage, 2006, 122(9): 93 ~96; Sun Boya, Chen Hongbin, Research Progress on Phosphorus Recovery in Sewage Treatment. Sichuan Environment, 2007, 26(1): 90~94, but most of them are still in the research stage of the laboratory, and there is a lack of systematic and promising experiments Programs and Measures

Method used

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  • Method for removing and recycling phosphorus from phosphorus-rich water bodies or sewage by using natural mineral mixture
  • Method for removing and recycling phosphorus from phosphorus-rich water bodies or sewage by using natural mineral mixture
  • Method for removing and recycling phosphorus from phosphorus-rich water bodies or sewage by using natural mineral mixture

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 6g of mixed mineral powder (the particle size of calcite is 400 mesh, and the particle size of gypsum is 150 mesh) with a ratio of 14:1 (mass ratio of calcite / anhydrite), put it into a conical flask, and add the initial phosphorus concentration of 20mg / L solution, adjust the pH to 5, put it into a constant temperature oscillator, set the rotation speed at 150 rpm, and the temperature at 30°C. After reacting for 10 hours, take the supernatant for testing. 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 20 mg / L, and repeat the operation 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 1.718 mg, and the effective phosphorus removal amount corresponding to 1 g of gypsum is 4.29 mg (Table 1, No.1).

Embodiment 2

[0029] Take 5g of mixed mineral powder (the particle size of calcite is 800 mesh, and the particle size of gypsum is 800 mesh) with a ratio of 4:1 (mass ratio of calcite / anhydrite), put it into a conical flask, and add the initial phosphorus concentration of 15mg / L solution, adjust the pH to 7; put it into a constant temperature oscillator, set the rotation speed at 150 rpm, and the temperature at 30°C. After reacting for 4 hours, take the supernatant for testing. 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 15 mg / L, and repeat the operation 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 5.563 mg, and the effective phosphorus removal amount corresponding to 1 g of gypsum is 5.56 mg (Table 1, No.2).

Embodiment 3

[0031] Take 4g of mixed mineral powder (the particle size of calcite is 250 mesh, and the particle size of gypsum is 800 mesh) with a ratio of 9:1 (mass ratio of calcite / anhydrite), put it into a conical flask, and add the initial phosphorus concentration of 10mg / L solution, adjust the pH to 10; put it into a constant temperature oscillator, set the rotation speed at 150 rpm, and the temperature at 30°C. After reacting for 8 hours, take the supernatant for testing. 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 10 mg / L, and repeat the operation 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 1.903 mg, and the effective phosphorus removal amount corresponding to 1 g of gypsum is 4.76 mg (Table 1, No.3).

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Abstract

The invention discloses a method for removing and recycling phosphorus from phosphorus-rich water bodies or sewage by using a natural mineral mixture. The method comprises the following steps of: weighing calcite powder and anhydrite powder with the particle sizes 150-180 meshes respectively and mixing in the mass ratio 4:1-14:1, wherein the range of effective phosphorus removal capacity corresponding to every gram of anhydrite in mixed mineral is (0.1*CP)-(0.9*CP) mg (CP refers to a numerical value of the initial phosphorus concentration (mg / L) of the solution) in a solution with the initial phosphorus concentration 20-2 mg / L under the condition that the temperature is 15-30 DEG C and the reaction time is 1-12 hours; and when the phosphorus removing effect of the mixed mineral is poor, adding anhydrite mineral powder, wherein the range of effective phosphorus removal capacity corresponding to every gram of anhydrite is (0.15*CP)-(2*CP) mg at the moment. The method can be used for removing and recycling phosphorus from phosphorus-rich water bodies such as to urban living sewage, industrial waste water, rural scattered living sewage, eutrophic lake water bodies, large, medium and small-sized eutrophic landscape water bodies, 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): C02F9/04C01B25/32C02F1/66
Inventor 张宏
Owner GUILIN UNIVERSITY OF TECHNOLOGY
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