Method for lowering leaching toxicity of waste incineration fly ash through bacillus firmus

A technology for waste incineration fly ash and Bacillus firmus, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., to achieve the effects of reducing leaching toxicity, good heavy metal stabilization effect, and good environmental adaptability

Inactive Publication Date: 2016-11-16
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on the use of microorganisms to treat heavy metals in the fly ash of domestic waste incineration.

Method used

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  • Method for lowering leaching toxicity of waste incineration fly ash through bacillus firmus
  • Method for lowering leaching toxicity of waste incineration fly ash through bacillus firmus
  • Method for lowering leaching toxicity of waste incineration fly ash through bacillus firmus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Step 1) Purchasing Bacillus firmus strains at China General Microorganism Culture Collection Center (CGMCC);

[0028] Step 2) prepare culture medium

[0029] The composition of the culture medium is shown in Table 1. It was sterilized at a high temperature of 121° C. and a high pressure of 0.15 MPa for 20 minutes, and then allowed to stand at room temperature.

[0030] Table 1 Medium composition

[0031] composition

Mass / g

effect

Peptone

5.0

growth factor

meat extract

3.0

Nutrients

Sodium chloride

20.0

Inorganic salt

distilled water

1000.0

Provide moisture, growth environment

[0032] Step 3) bacterial culture and bacterial concentration measurement

[0033] Inoculate the bacterial species in step 1) into a Erlenmeyer flask containing medium at a 1% (v / v) inoculum amount on an ultra-clean bench, and vibrate and culture at 30°C and 220r / min on a shaker for 46h.

[0034] Bacteria concentratio...

Embodiment 2

[0041] Step 1) Purchasing Bacillus firmus strains at China General Microorganism Culture Collection Center (CGMCC);

[0042] Step 2) prepare culture medium

[0043] The composition of the medium is shown in Table 2. It was sterilized at 121° C. under high pressure of 0.15 MPa for 15 minutes, and allowed to stand at room temperature.

[0044] Table 2 Medium composition

[0045] composition

Mass / g

effect

Peptone

3.0

growth factor

meat extract

1.0

Nutrients

Sodium chloride

15.0

Inorganic salt

distilled water

600.0

Provide moisture, growth environment

[0046] Step 3) bacterial culture and bacterial concentration measurement

[0047] On the ultra-clean bench, inoculate the bacterial species in step 1) into the Erlenmeyer flask containing the culture medium according to the inoculum amount of 1% (v / v), and shake and culture at 20° C. and 240 r / min on a shaker for 24 hours.

[0048] Bacteria concentrati...

Embodiment 3

[0054] Step 1) Purchase a sample of Bacillus firmus at the China General Microorganism Culture Collection Center (CGMCC);

[0055] Step 2) prepare culture medium

[0056] The composition of the culture medium is shown in Table 3. It was sterilized at a high temperature of 121° C. and a high pressure of 0.15 MPa for 20 minutes, and then allowed to stand at room temperature.

[0057] Table 3 Medium composition

[0058] composition

Mass / g

effect

Peptone

7.0

growth factor

meat extract

5.0

Nutrients

Sodium chloride

30.0

Inorganic salt

distilled water

1400.0

Provide moisture, growth environment

[0059] Step 3) bacterial culture and bacterial concentration measurement

[0060] Inoculate the bacterial species in step 1) into a Erlenmeyer flask containing a culture medium at a 1% (v / v) inoculum amount on a clean bench, and vibrate and culture at 35° C. and 180 r / min on a shaker for 48 hours.

[0061] Bact...

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Abstract

The invention discloses a method for lowering the leaching toxicity of waste incineration fly ash through bacillus firmus. The bacillus firmus is inoculated into a culture medium containing peptone, yeast extracts and sodium chloride, and shake cultivation is conducted on a shaker till a bacteria solution is completely turbid; the prepared bacteria solution and the waste incineration fly ash are mixed and stirred evenly according to proportions; and a urea solution is sprayed circularly, and the heavy metal leaching toxicity of the waste incineration fly ash is obviously lowered in 3-7 days. The characteristic that the bacillus firmus still has the good survival and reproduction capabilities and urease productivity in the environments of various heavy metals, organic poisons and strong alkaline is utilized, and the leaching toxicity of heavy metal ions in the waste incineration fly ash can be lowered just by adding the bacillus firmus bacteria solution and the urea solution into the waste incineration fly ash. The adopted bacillus firmus has the good environmental tolerance and has the good stabilizing effect on fly ash produced by two incineration processes with grate furnaces and fluidized beds.

Description

technical field [0001] The invention relates to a method for reducing the leaching toxicity of waste incineration fly ash, in particular to a method for reducing the leaching toxicity of waste incineration fly ash by using bacillus firmus. Background technique [0002] The amount of domestic waste incineration in my country is showing a rapid growth trend. By the end of 2015, the daily output was close to 10,000 tons. Waste incineration fly ash is a product of domestic waste incineration. It contains a variety of heavy metals and dioxins and other toxic substances, and has high leaching toxicity. It is a hazardous waste and is included in the "National Hazardous Waste List" (No. HW18). "Standards for Pollution Control of Domestic Garbage Incineration" (GB18485-2001) stipulates that incineration fly ash must be treated innocuously before safe landfill disposal. [0003] At present, the harmless treatment methods of incineration fly ash mainly include solidification treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B3/20B09B2101/30
Inventor 陈萍高炎旭
Owner ZHEJIANG SCI-TECH UNIV
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