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Quantitative application process for removing phosphorous from phosphorous-enriched water by natural minerals

A natural mineral, phosphorus-rich technology, applied in the field of water pollution control, can solve the problems of high operating cost, high cost, technical obstacles, etc., and achieve the effect of convenient use and water body optimization.

Inactive Publication Date: 2010-06-16
JIANGSU POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Quantitative application process for removing phosphorous from phosphorous-enriched water by natural minerals
  • Quantitative application process for removing phosphorous from phosphorous-enriched water by natural minerals
  • Quantitative application process for removing phosphorous from phosphorous-enriched water by natural minerals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take 10g 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 200mL conical flask, add The initial phosphorus concentration is 1000mg / L solution 100mL, 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 12 hours of reaction, 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 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 gypsum is 149.27 mg (Table 1, No.1).

Embodiment 2

[0029] Take 10g of mixed mineral powder (the particle size of calcite is 800 mesh and the particle size of gypsum is 500 mesh) with a ratio of 9:1 (mass ratio of calcite / anhydrite), put it into a 200mL Erlenmeyer flask, add the initial Phosphorus concentration is 100mg / L solution 100mL, 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 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 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 is 29.82 mg (Table 1, No.2).

Embodiment 3

[0031] Take 15g of mixed mineral powder with a ratio of 14:1 (mass ratio of calcite / anhydrite) (the particle size of calcite is 800 mesh, and the particle size of gypsum is 600 mesh), put it into a 200mL Erlenmeyer flask, add the initial Phosphorus concentration is 50mg / L solution 100mL, 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 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 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 (Table 1, No.3).

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Abstract

The invention provides a quantitative process method for removing and recovering phosphorous from phosphorous-enriched water or sewage by natural minerals, which comprises the following steps: weighing calcite and anhydrite powder respectively, controlling the particle size to between 150 and 800 meshes, mixing the two in a mass ratio of 4:1-14:1, and ensuring that a range of effective phosphorous removal quantity corresponding to each 1g of plaster in the mixed minerals is between (0.1*CP) and (0.9*CP)mg in solution with the initial phosphorous concentration between 1,000 and 2mg / L under the conditions that the temperature is between 15 and 30 DEG C and the reaction time is 1 to 12 hours; and after the phosphorous removal effect of the mixed minerals is low, adding the anhydrite mineral powder to ensure that the effective phosphorous removal quantity corresponding to each 1g of the plaster is between (0.15*CP) and (2*CP)mg at the moment (CP is a value of the initial phosphorous concentration (mg / L) of the solution). The process can be applied to removing and recovering the phosphorous from phosphorous-enriched water such as urban domestic sewage, industrial wastewater, rural decentralized domestic sewage, eutrophic lake water, and large, medium and small-sized eutrophic scenic water.

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 张宏喻鹏辉高洪刚
Owner JIANGSU POLYTECHNIC UNIVERSITY
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