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Method for recycling phosphorus from sludge ash

A cyclic extraction and sludge ash technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of low phosphorus extraction rate, a large amount of waste liquid, and large consumption of chemicals, so as to reduce the difficulty of extraction and avoid Pollution, the effect of favoring the precipitation of phosphorus

Active Publication Date: 2018-11-30
SICHUAN UNIV
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AI Technical Summary

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
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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 150rmp 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 200rmp 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;

[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...

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 300rmp 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 recycling phosphorus from sludge ash. According to the method, sludge incineration ash is taken as a raw material and undergoes first extraction with a sulfuric acid solution, then the obtained extraction liquid is mixed with a concentrated sulfuric acid solution according to a volume ratio of 28.8:1.2 to 28.4:1.6, so that a new extracting agent is prepared andused to extract the remaining sludge ash; and if necessary, the sludge ash can be divided into multiple parts for multiple extraction, and an extracting agent used in a next extraction is formed by mixing an extraction liquid obtained after a previous extraction with a concentrated sulfuric acid solution. In the method of the present invention, the extraction liquid is used as an extracting agent, so that discharge of waste liquid is greatly reduced, and after cyclic extraction, the extraction rate of phosphorus in the sludge ash can exceed 96%, and the concentration of phosphorus in a finalextraction liquid exceeds 21-23 g / L, thereby effectively solving the technical problems of low phosphorus extraction rate, large consumption of chemicals and large amount of waste liquid in the priorart.

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 Applications(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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