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Method for consolidating waste incineration fly ash heavy metal through microorganism cement mineralization

A technology for waste incineration fly ash and microbial cement, which is applied in the field of environmental engineering, can solve the problems of the influence of cement consolidation and hardening time, reduce fly ash strength, and high cement consumption, so as to improve the consolidation efficiency of heavy metals and avoid secondary Environmental pollution, the effect of low metal leaching concentration

Inactive Publication Date: 2015-09-23
TIANJIN CHENGJIAN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Although domestic and foreign research institutions have made a series of achievements and significant application progress in the research of cement-consolidated fly ash technology, there are still high cement consumption (about 60% of the content), large volume increase and weight increase ratio, Unable to absorb increasing fly ash for a long time
In addition, the chloride salts and heavy metal ions contained in the fly ash will affect the setting and hardening time of the cement consolidated body, thereby reducing the strength of the fly ash consolidated body, which will lead to the rupture of the consolidated body and the further dissolution of heavy metal ions, resulting in environmental pollution. pollution and other issues

Method used

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  • Method for consolidating waste incineration fly ash heavy metal through microorganism cement mineralization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The leaching concentrations of the typical heavy metals Pb, Zn, Cu, Cd and Cr in pure water were 9.34mg / L, 118.51mg / L, 167.34mg / L, respectively. L, 1.14mg / L and 25.54mg / L.

[0029] 1. First prepare the microbial cement cement calcite:

[0030] Inoculate Bacillus pasteurianus into the mixed medium of soybean peptone and casein peptone, the medium contains 3-7g of soybean peptone and 13-15g of casein peptone per liter; control the pH at 6-8, at 30-37°C, the speed is 160 Under ~180r / min, cultivate for 16 ~ 24 hours to get Bacillus pasteurian bacteria liquid.

[0031] Separately, 180 grams of urea, 333 grams of calcium chloride, 600 grams of calcium bromide, and 495 grams of calcium nitrate were dissolved in 3 liters of water and mixed to obtain a 1 mol / L urea-calcium source mixed solution.

[0032] Take 0.5 liters of the Bacillus pasteurian bacteria liquid and 1 mol / L urea-calcium source mixed solution, mix them, and stir them evenly to obtain microbial cement. The obta...

Embodiment 2

[0036] The leaching concentrations of typical heavy metals Pb, Zn, Cu, Cd and Cr in pure water from waste incineration fly ash collected from a coal-fired power plant were 7.24mg / L, 112.11mg / L, 137.14mg / L, 1.43mg / L and 18.97mg / L.

[0037] Microbial cement cementitious material calcite was prepared according to Example 1.

[0038] Take 16g of calcite, 40g of waste incineration fly ash, 40g of water, and then mix the calcite and waste incineration fly ash evenly, maintain at 25°C for 5 days, demould, and dry.

[0039] Test its compressive strength, the result is 2.7MPa. The leaching concentration of typical heavy metals in pure water was tested by the horizontal oscillation method. They were 1.52mg / L, 38.82mg / L, 32.78mg / L, 0.62mg / L and 10.91mg / L respectively, which were all lower than my country's "Dangerous The standard limits specified in the Waste Leaching Toxicity Standard.

Embodiment 3

[0041] The leaching concentrations of typical heavy metals Pb, Zn, Cu, Cd and Cr in pure water from waste incineration fly ash collected from a coal-fired power plant were 8.48mg / L, 115.43mg / L, 142.36mg / L, 1.62mg / L and 28.68mg / L.

[0042] Microbial cement cementitious material calcite was prepared according to Example 1.

[0043] Weigh 24g of calcite, 40g of waste incineration fly ash, and 50g of water, and then mix the calcite and waste incineration fly ash evenly, maintain at 25°C for 7 days, demould, and dry.

[0044] Test its compressive strength, the result is 3.3MPa. The leaching concentration of typical heavy metals in pure water was tested by the horizontal oscillation method. They were 1.21mg / L, 37.24mg / L, 28.98mg / L, 0.72mg / L and 11.23mg / L respectively, which were all lower than my country's "Dangerous The standard limits specified in the Waste Leaching Toxicity Standard.

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Abstract

The invention discloses a method for consolidating waste incineration fly ash heavy metal through microorganism cement mineralization. Through the method disclosed by the invention, microorganism cement is obtained and a microorganism cement bonded product, namely calcite, is obtained, and the calcite is used for consolidating waste incineration fly ash according to the method. A consolidated product formed by consolidating the waste incineration fly ash with the method is low in heavy metal leaching and high in stability of induration, and can be used as a building material.

Description

technical field [0001] The invention relates to a treatment method for waste incineration fly ash, in particular to a method for mineralizing and consolidating waste incineration fly ash with microbial cement, which belongs to the field of environmental engineering. Background technique [0002] At present, more than one-third of cities in China are trapped in the predicament of "garbage siege", and the output of urban domestic waste in my country is still increasing at an annual rate of 8-10%. In order to solve the problem of "garbage siege", countries at home and abroad have adopted waste incineration technology for waste treatment. This method can achieve a 90% volume reduction rate of waste and a 70-80% weight loss rate. At the same time, the heat energy generated in waste incineration It can also be recycled and reused, so it has become an important research and development direction for garbage disposal. [0003] Although waste incineration technology can maximize vol...

Claims

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Application Information

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IPC IPC(8): C04B12/00B09B3/00
Inventor 荣辉张磊王雪平余海燕曲烈杨久俊
Owner TIANJIN CHENGJIAN UNIV
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