Method for processing fly ash by microorganisms and producing building materials from fly ash

A technology of processing method and production method, applied in the fields of energy and environment, to achieve the effects of high dry density, lower concrete cost and simple process

Inactive Publication Date: 2019-05-31
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Purpose of the invention: The purpose of the present invention is to use the characteristics that microorganisms can induce the production of calcium carbonate to form a new fly ash treatment method, which can also produce microbial fly ash building materials, which can not only solve the problem of large-scale storage of fly ash It can also realize the reuse of fly ash, which has significant economic benefits

Method used

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  • Method for processing fly ash by microorganisms and producing building materials from fly ash
  • Method for processing fly ash by microorganisms and producing building materials from fly ash
  • Method for processing fly ash by microorganisms and producing building materials from fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Step 1. Preparation of Bacillus pasteurian bacteria liquid:

[0033] Bacterial freeze-dried powder activation: The purchased Bacillus sporosarcina pasteurii (National Culture Collection No. ATCC11859) was vacuum-dried in the state of freeze-dried powder and stored in an ampoule bottle. Prepare liquid medium first, each liter of medium contains 20g of yeast extract, 25mg of manganese sulfate, 5mg of nickel chloride, 15g of ammonium chloride, and adjust the pH to 9-10 with 1mol / L sodium hydroxide. The culture medium and the solid culture slant for inoculation were sterilized by high-temperature steam at 121°C for 20 minutes, and then placed in a sterile operating table to cool down before use. Heat the upper end of the ampoule bottle with an alcohol lamp, drop a few drops of water to break it, take out the inner tube with tweezers, drop 1ml of the above prepared medium to dissolve the dry powder, then pour it into a culture tube containing 6ml of culture medium, and mix w...

Embodiment 2

[0042] This embodiment is an evaluation embodiment of the reinforcement effect of treating fly ash deposits with different concentrations of Bacillus pasteurian bacteria liquid in the treatment method of the above-mentioned embodiment 1.

[0043] Step 1. The lower limit of bacterial concentration

[0044] Cultivate the Pasteurella bacterium liquid by the method in embodiment 1, culture time is less than 40h, or the higher bacterium liquid of concentration is diluted to 10 7After the concentration of cfu / mL is below, process the fly ash accumulation body, the concentration of nutrient solution is 0.5mol / L (the ratio of calcium chloride to urea is 1:1), the efficiency of processing fly ash is low, and the fly ash is difficult to cement into a block .

[0045] Step 2. The upper limit of bacterial concentration

[0046] Centrifuge the bacteria solution normally cultured for 40-60 hours to increase the concentration to 10 9 Above cfu / mL, take samples from different parts of the ...

Embodiment 3

[0050] This example is an example of evaluating the effect of using different concentrations of urea and calcium chloride nutrient solution to treat fly ash deposits in the above treatment method.

[0051] Step 1. Consider microbial treatment of fly ash deposits with different concentrations of nutrient solution

[0052] This example uses about 3×10 8 Cfu / mL concentration of Bacillus Pasteurella bacteria solution to treat fly ash accumulations, the amount of microbial bacteria solution is controlled between 100L and 200L per ton; the concentration and ratio of urea and calcium chloride in the nutrient solution are changed, and nutrition is perfused 8 times solution, the total amount of nutrient solution was 5 times the total amount of bacterial solution added; details are shown in Table 2.

[0053] Table 2

[0054]

[0055]

[0056] Step 2. Detection of reaction efficiency and reinforcement effect

[0057] Collect the effluent of each test, detect the calcium ion conc...

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Abstract

The invention relates to a method for treating fly ash with microbes and a method for producing a building material from the treated fly ash. According to the invention, high-concentration microbes are sprinkled onto a piled body of the fly ash, and then a nutrient solution composed of urea and calcium chloride is added for induction of production of calcium carbonate cemented fly ash; so on-site stacking of fly ash is prevented from generation of flying dust, and cemented blocks are convenient for secondary treatment. The method for producing the building material for the microbe-treated fly ash comprises the following steps: carrying out vibration fragmentation so as to form agglomerates with different sizes and sieving the agglomerates, wherein the sieved agglomerates can be used as a concrete aggregate, a backfilling material for pipeline construction, a filling material for a retaining wall, etc. The methods disclosed in the invention are simple in process, can protect environment and have high environmental and economic benefits.

Description

technical field [0001] The invention relates to the technical field of energy and environment, in particular to a method for using microorganisms to process fly ash and produce building materials from fly ash. Background technique [0002] With the development of my country's economy, the demand for energy is also increasing. Although new energy sources such as hydropower and wind power have been vigorously developed in recent years, my country's energy structure dominated by thermal power will not change for a long time in the future. Thermal power generation produces a large amount of fly ash. According to statistics, the total storage of fly ash in my country has exceeded 1 billion tons, and it is also increasing at a rate of 100 million tons per year. [0003] The conventional fly ash treatment method is to build an artificial dam and use water to transport the fly ash to the dam for sedimentation and disposal. This method requires a large amount of land, and the dry de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/02
CPCC04B20/023C04B18/08C04B2103/0001C04B24/126C04B22/124C04B20/026
Inventor 彭劼孙益成冯清鹏蒋锐
Owner HOHAI UNIV
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