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Method for achieving aggregation of waste incineration fly ash through microorganism mineralization

A waste incineration fly ash and mineralization technology, which is applied in the field of fly ash agglomeration, can solve the problems of difficulty in finding a universal chelating agent, high cost, and large capacity expansion ratio, so as to facilitate the formation, crystallization, and leaching Effect of reducing toxicity and reducing leaching toxicity

Active Publication Date: 2016-01-27
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The compatibilization problem of chemical chelation treatment is not obvious, and it has a good stabilization effect on some heavy metals. However, because fly ash contains various heavy metals and organic pollutants such as dioxin, it is difficult to find a universal chelating agent. In addition, chemical chelation treatment High cost (2000-3000 yuan / ton)
[0004] In order to solve the problems of high cement-solidified cement content, large volume-increasing ratio, poor universality of chemical chelation, and high cost, the present invention proposes a method of using microbial mineralization to realize the agglomeration of waste incineration fly ash, and reduces waste by agglomeration. Leaching Toxicity of Incineration Fly Ash

Method used

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  • Method for achieving aggregation of waste incineration fly ash through microorganism mineralization
  • Method for achieving aggregation of waste incineration fly ash through microorganism mineralization
  • Method for achieving aggregation of waste incineration fly ash through microorganism mineralization

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Effect test

Embodiment 1

[0036] Step 1) Prepare culture medium

[0037] Prepare the culture medium (the culture medium components are shown in Table 1), sterilize at 121°C high temperature, 103kPa high pressure, 20min, let it stand to room temperature, and put Sporosarcinapasteurii (purchased from China General Microorganism Culture Collection Center, No. cgmcc1.3687) was inoculated into a Erlenmeyer flask containing a culture medium at a 1% (v / v) inoculation amount, and cultured on a shaker at 30°C and 220r / min for 46h.

[0038] Table 1 Medium composition

[0039]

[0040] Bacteria solution OD 600 measurement of value

[0041] Bacteria concentration in OD 600The value is expressed, and its value is measured by a UV spectrophotometer. Take 1mL of the bacterial solution cultured on the shaking table (ensure that the operation of the bacterial solution is completed in a sterile environment to avoid contamination of the bacterial solution), and inject it into the culture tube immediately. Take 2 ...

Embodiment 2

[0047] Step 1) Prepare culture medium

[0048] Prepare the culture medium (the composition of the culture medium is shown in Table 1), sterilize at 121°C high temperature, 103kPa high pressure, 15min, and let it stand to room temperature. Culture Collection Center, No. cgmcc1.6503) was inoculated into a Erlenmeyer flask containing medium at a 1% (v / v) inoculum amount, and cultured on a shaker at 20°C and 240r / min for 24h.

[0049] Table 1 Medium composition

[0050]

[0051] Bacteria solution OD 600 measurement of value

[0052] Bacteria concentration in OD 600 The value is expressed, and its value is measured by a UV spectrophotometer. Take 1mL of the bacterial solution cultured on the shaking table (ensure that the operation of the bacterial solution is completed in a sterile environment to avoid contamination of the bacterial solution), and inject it into the culture tube immediately. Take 2 μL of each sample and measure its OD with a UV spectrophotometer 600 value...

Embodiment 3

[0057] Step 1) Prepare culture medium

[0058] Prepare the culture medium (the composition of the culture medium is shown in Table 1), sterilize at 121°C high temperature, 103kPa high pressure, 20min, let it stand to room temperature, and put Bacillus lentus (purchased from China General Microorganism Culture Collection) on the ultra-clean bench. Center, No. cgmcc1.4082) was inoculated into a Erlenmeyer flask containing medium at a 1% (v / v) inoculation amount, and cultured on a shaker at 35° C. and 180 r / min for 48 hours.

[0059] Table 1 Medium composition

[0060]

[0061] Bacteria solution OD 600 measurement of value

[0062] Bacteria concentration in OD 600 The value is expressed, and its value is measured by a UV spectrophotometer. Take 1mL of the bacterial solution cultured on the shaking table (ensure that the operation of the bacterial solution is completed in a sterile environment to avoid contamination of the bacterial solution), and inject it into the culture...

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Abstract

The invention discloses a method for achieving aggregation of waste incineration fly ash through microorganism mineralization. Peptone, meat extract and urea are placed in distilled water 200 mass folds of peptone according to the mass ratio for preparing a culture medium; after high-temperature and high-pressure sterilization, bacteria with mineralization are inoculated into the culture medium, shaking culture is carried out on a shaking table till bacterial liquid is completely turbid; the prepared bacterial liquid and the waste incineration fly ash are mixed and stirred evenly in proportion, and are horizontally laid on a corrosion-resistant plane; and a urea solution is sprayed, and aggregated waste incineration fly ash can be obtained. The characteristics that the waste incineration fly ash is rich in calcium ion and heavy metal ion and alkaline in lixivium are utilized, only the bacterial liquid of microorganisms with mineralization and the urea solution need to be added to the waste incineration fly ash, and the aggregated waste incineration fly ash can be obtained. The particle diameter of aggregated waste incineration fly ash is remarkably increased, and the mass of the aggregated waste incineration fly ash with the particle diameter large than 80 micrometers is increased to 90% to 95% from 15% to 20%.

Description

technical field [0001] The invention relates to a method for agglomerating fly ash, in particular to a method for realizing agglomeration of waste incineration fly ash by utilizing microbial mineralization. Background technique [0002] Waste incineration fly ash is the product of waste incineration. It is gray in color and the particle size is mainly 0.02-0.08mm. It is rich in calcium and is alkaline. It is rich in various heavy metal ions and dioxins and other pollutants. It is classified as hazardous waste and needs to be disposed of safely after harmless treatment. At present, the daily output of waste incineration fly ash in my country is close to 10,000 tons, and its harmless treatment and disposal has become a hot issue of social concern. [0003] At present, the most commonly used treatment methods for waste incineration fly ash are cement solidification and chemical chelation. Cement solidification is to mix fly ash and cement with water, and the gelled substance ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B3/10B09B2101/30B09B3/20
Inventor 陈萍高炎旭
Owner ZHEJIANG SCI-TECH UNIV
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