A method for circularly extracting phosphorus from sludge ash

A technology of recycling extraction and sludge ash, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low phosphorus extraction rate, large consumption of chemicals, and large amount of waste liquid, etc. The effect of phosphorus precipitation and pollution prevention

Active Publication Date: 2020-01-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above-mentioned prior art, the present invention provides a method for circularly extracting phosphorus from sludge ash to solve the technical problems of low phosphorus extraction rate, large consumption of chemicals and large amount of waste liquid

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] A method for circularly extracting phosphorus from sludge ash, comprising the following steps:

[0034] (1) Get the sludge incineration ash in the urban domestic sewage treatment plant, and pass through a 100-mesh sieve after ball milling;

[0035] (2) heating the sulfuric acid solution with a mass fraction of 10% to 25° C., and then mixing it with sludge ash at a liquid-solid ratio of 3 mL / g to obtain a slurry;

[0036] (3) Put the slurry in a stirring container, stir and react at 25°C and 150rpm for 30 minutes, then add deionized water to terminate the reaction, then perform suction filtration on the reacted slurry, and filter the sludge after suction filtration The cake is washed with distilled water, and the cleaning liquid and the filtrate are combined to obtain an extract;

[0037] (4) the sulfuric acid solution that is 98% by extracting solution and mass fraction is mixed by the volume ratio of 28.8:1.2, prepares extractant, replaces the sulfuric acid solution i...

Embodiment 2

[0040] A method for circularly extracting phosphorus from sludge ash, comprising the following steps:

[0041] (1) Get the sludge incineration ash in the urban domestic sewage treatment plant, and pass through a 100-mesh sieve after ball milling;

[0042] (2) Heating the sulfuric acid solution with a mass fraction of 7% to 45° C., and then mixing it with sludge ash at a liquid-solid ratio of 4 mL / g to obtain a slurry;

[0043] (3) Put the slurry in a stirring container, stir and react at 45°C and 200rpm for 30min, then add deionized water to terminate the reaction, then perform suction filtration on the reacted slurry, and filter the sludge after suction filtration The cake is washed with distilled water, and the cleaning liquid and the filtrate are combined to obtain an extract;

[0044] (4) the sulfuric acid solution that is 98% by extracting solution and mass fraction is mixed by the volume ratio of 28.4:1.2, prepares extractant, replaces the sulfuric acid solution in step...

Embodiment 3

[0047] A method for circularly extracting phosphorus from sludge ash, comprising the following steps:

[0048] (1) Get the sludge incineration ash in the urban domestic sewage treatment plant, and pass through a 100-mesh sieve after ball milling;

[0049](2) heating the sulfuric acid solution with a mass fraction of 13% to 30° C., and then mixing it with sludge ash at a liquid-solid ratio of 5 mL / g to obtain a slurry;

[0050] (3) Put the slurry in a stirring container, stir and react at 30°C and 300rpm for 30 minutes, then add deionized water to terminate the reaction, then perform suction filtration on the reacted slurry, and filter the sludge after suction filtration The cake is washed with distilled water, and the cleaning liquid and the filtrate are combined to obtain an extract;

[0051] (4) the sulfuric acid solution that extracting solution and mass fraction are 13% is mixed by the volume ratio of 28.4:1.6, prepares extractant, replaces the sulfuric acid solution in s...

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Abstract

The invention discloses a method for circularly extracting phosphorus from sludge ash. In the method, sludge incineration ash is used as a raw material, and sulfuric acid solution is used for extraction once, and then the extract and concentrated sulfuric acid solution are mixed according to the ratio of 28.8:1.2 to 28.4: The volume ratio of 1.6 is mixed and prepared into a new extractant to extract the remaining sludge ash; according to the needs, the sludge ash can be divided into multiple parts for multiple extractions, and the extractant used in the latter extraction is changed from the previous one. After the extraction is completed, the extract is mixed with concentrated sulfuric acid solution. In the present invention, the extract is used as an extractant, which can greatly reduce the discharge of waste liquid, and after cyclic extraction, the extraction rate of phosphorus in sludge ash can exceed 96%, and the concentration of phosphorus in the final extract exceeds 21-23g / L, can effectively solve the technical problems of low phosphorus extraction rate, large consumption of chemicals and large amount of waste liquid in the prior art.

Description

technical field [0001] The invention belongs to the technical field of resource recovery in sewage treatment plants, and in particular relates to a method for circularly extracting phosphorus from sludge ash. Background technique [0002] Phosphorus is one of the essential elements for the survival of all living organisms, and plays an important role in cell structure and cell function. With the development of industry and agriculture, the human demand for phosphate rock is increasing day by day, and phosphorus is a one-way flow element in the biosphere, which further intensifies the contradiction between demand and supply. [0003] Phosphorus recovery from excess sludge generated during municipal sewage treatment has great potential. After the excess sludge is incinerated, sludge ash with a phosphorus content of 5% to 10% is obtained, which is equivalent to the average content of phosphorus in Chinese phosphate rocks, and has the value of increasing phosphorus. [0004] A...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/222
CPCC01B25/222
Inventor 刘敏陈滢付雄徐灵芳
Owner SICHUAN UNIV
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