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A method for removing phosphorus in waste water by using fly ash

A waste water and coal powder ash technology, applied in the environmental field, can solve problems such as difficult dehydration, difficult treatment, and high cost of phosphorus removal

Active Publication Date: 2018-02-13
NANTONG CELLULOSE FIBERS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have a common feature, that is, they need to consume a large amount of chemical agents, and produce a large amount of hydrous chemical sludge, which is difficult to dehydrate and handle, making the cost of phosphorus removal relatively high.

Method used

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  • A method for removing phosphorus in waste water by using fly ash
  • A method for removing phosphorus in waste water by using fly ash
  • A method for removing phosphorus in waste water by using fly ash

Examples

Experimental program
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Effect test

Embodiment 1

[0033] Example 1 (Example 1 is used to illustrate that the method provided by the invention is also applicable to inorganic phosphorus.)

[0034] (1) Take 200 mL of simulated wastewater prepared with sodium dihydrogen phosphate at a concentration of 5000 mg / L (calculated as P) into a 250 mL Erlenmeyer flask, and adjust the pH of the wastewater to 6.0 with 2 mol / L hydrochloric acid.

[0035] (2) Add quantitatively 30g of coal powder ash with a calcium oxide content of 25%, the mass ratio of coal powder ash to waste water is 3:20, and react at a constant temperature of 55°C for 1 hour under magnetic stirring (300 rpm).

[0036] (3) Separation of waste water and coal dust after the reaction. Filter with Whatman No1# filter paper, adopt plasma emission spectrometry (ICP) and pH meter to test the total phosphorus and pH value in the filtrate, and its total phosphorus content is 51mg / L, and pH is 12.29. Phosphorus removal efficiency reaches 99.0%. The experimental results show tha...

Embodiment 2

[0038] (1) Take 200 mL of simulated wastewater prepared with methylphosphonic acid at a concentration of 2155 mg / L (calculated as P) into a 250 mL Erlenmeyer flask, and adjust the pH of the wastewater to 6.8 with 20% sodium hydroxide.

[0039] (2) Add quantitatively 15g of coal powder ash with a calcium oxide content of 25%, the mass ratio of coal powder ash to waste water is 3:40, and react at a constant temperature of 55°C for 1 hour under magnetic stirring (300 rpm).

[0040] (3) Separation of waste water and coal dust after the reaction. Filter with Whatman No1# filter paper, adopt plasma emission spectrometry (ICP) and pH meter to test the total phosphorus and pH value in the filtrate, and its total phosphorus content is 93mg / L, and pH is 12.08. Phosphorus removal efficiency reaches 95.7%. The experimental results show that coal fly ash not only has a strong chemical adsorption effect on orthophosphorus, but also has a strong removal effect on organic phosphorus.

Embodiment 3

[0042] Get industrial waste water, through ion chromatographic analysis, total phosphorus (calculated as P) in water is 155mg / L, wherein contains 63.3% orthophosphorus, 36.7% organic phosphorus. The organic phosphorus content in the form of methylphosphonic acid was 43.5mg / L (accounting for 76.5% of organic phosphorus), and the content of organic phosphorus in the form of dimethylphosphonic acid was 13.4mg / L (accounting for 23.5% of total organic phosphorus).

[0043] (1) Take the above-mentioned 200mL industrial wastewater into a 250mL Erlenmeyer flask, and adjust the pH of the wastewater to 6.5 with 20% sodium hydroxide.

[0044] (2) Add quantitatively 7.5g of coal powder ash with a calcium oxide content of 25%, the mass ratio of coal powder ash to waste water is 3:80, and react at a constant temperature of 55°C for 1 hour under magnetic stirring (300 rpm).

[0045] (3) Separation of waste water and coal dust after the reaction. Filter with Whatman No1# filter paper, use plas...

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Abstract

The invention belongs to the technical field of environment and relates to a method for removing phosphorus in waste water by using fly ash. The method comprises the following steps: (1) providing phosphorus-containing wastewater containing at least one organic phosphorus, adjusting its pH to be weakly acidic, (2) adding coal powder ash to the wastewater whose pH has been adjusted, and heating and stirring The coal powder ash and waste water are reacted and adsorbed; (3) After the reaction, the waste water and coal powder ash are separated. The invention utilizes the coal powder ash to remove most of the inorganic phosphorus and part of the organic phosphorus in the waste water, so that the total phosphorus removal efficiency can reach more than 50%. The coal ash after phosphorus removal not only solves the stability problem caused by the high active calcium oxide in the coal ash, but also can be used as a raw material for building materials to achieve the effect of treating waste with waste.

Description

technical field [0001] The invention belongs to the technical field of environment and relates to a method for removing phosphorus in waste water by using fly ash. Background technique [0002] Phosphorus is an important nutrient element in the biosphere, and usually exists in various forms such as orthophosphate, metaphosphate, polyphosphate and organic phosphorus. It is generally believed that phosphorus is the limiting factor for plant growth. Excessive phosphorus content in the water body will cause eutrophication of the water body, resulting in the rapid reproduction of algae and other plankton, the decrease of dissolved oxygen in the water body, the deterioration of water quality, and the massive death of fish and other organisms. Eutrophication pollution of water bodies is very common all over the world (including our country), and our country attaches great importance to it. The "Comprehensive Discharge Standard for Sewage" (GB8978-1996) clearly stipulates that the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28
Inventor 曹建国彭为骏张杰顾海兵杨广美
Owner NANTONG CELLULOSE FIBERS CO LTD
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