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Method of eliminating heavy metals from garbage burning flyash

A technology for waste incineration fly ash and heavy metals, applied in the field of environmental engineering, can solve the problems of large acid consumption, inconvenient operation, difficult to put into engineering practice, etc., and achieve the effects of mild growth conditions, high efficiency and easy operation.

Inactive Publication Date: 2007-01-03
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can greatly remove heavy metals in a short period of time, but it is difficult to put it into practical engineering because of its large acid consumption, high treatment cost, and inconvenient operation.

Method used

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  • Method of eliminating heavy metals from garbage burning flyash

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Effect test

specific Embodiment approach 1

[0022] Specific implementation mode one: this implementation mode removes heavy metals in waste incineration fly ash according to the following steps:

[0023] a. Aspergillus niger is cultivated on the slope of PDA medium, cultivated at 25-35°C for 5-7 days, mature spores grow, and the surface of the colony is dark brown;

[0024] b. Elute the spores on the inclined surface with sterile deionized water, inoculate 1-10% (v / v) spore suspension into sucrose liquid medium, and then add 2-10% (w / v) garbage Incinerate the fly ash, shake and filter at a constant temperature at 25-35°C and 100-200rpm for 15-25 days;

[0025] c. Separating the fly ash after leaching into solid and liquid, the solid phase after removal of heavy metals can be used as auxiliary materials for building materials, and the liquid phase containing heavy metals is recovered by electrodeposition.

[0026] The Aspergillus niger culture medium component that this embodiment provides is:

[0027] PDA medium (pota...

specific Embodiment approach 2

[0029] Specific implementation mode two: this implementation mode is realized in this way:

[0030] 1. Fly ash sampling and metal content analysis

[0031] The fly ash is taken from a waste incineration power plant in Zhejiang Province. The raw material is municipal solid waste, and the dust removal method is a bag filter. The fly ash samples were mixed and dried at 105°C for 24 hours to constant weight, and ground to 120 mesh. Weigh 0.5000g of ash sample (dry ash) and digest it with reference to US-EPA SW-846 3050 standard acid. The metal content was determined by a full-spectrum direct-reading inductively coupled plasma optical emission spectrometer (ICP-OES). The main heavy metal contents in fly ash are shown in Table 1.

[0032] Metal

Al

Cd

Cr

Cu

Fe

mn

Pb

Zn

Metal content (mg / g)

35.67

0.06217

0.18307

0.5511

22.94

0.7362

2.15

5.252

[0033] 2. Activation and expan...

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Abstract

The method of eliminating heavy metals from garbage burning flyash belongs to the field of environment engineering technology. Aspergillus niger, which can bear heavy metals, grow well under the substrate condition of liquid culture medium and flyash and produce organic acid through aerobic fermentation to leach out heavy metals from flyash, is used to eliminate heavy metals from garbage burning flyash. The technological process includes enlarging culturing Aspergillus niger to prepare suspension, inoculating the suspension in 1-10 vol% to culture liquid and adding the culture liquid in 2-10 vol% to flyash, and aerobic fermentation at 25-35 deg.c in constant temperature and vibrating condition for 15-25 days. The method of the present invention is simple, effective, low in cost, safe and environment friendly.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and relates to a method for dissolving heavy metals in fly ash by biological leaching, in particular to a method for removing heavy metals in waste incineration fly ash by using Aspergillus niger. Background technique [0002] With the progress of society and the development of economy, the output of municipal solid waste is increasing day by day. Municipal solid waste treatment mainly relies on incineration, composting and landfill. Garbage incineration has the advantages of fast processing speed, small footprint, low processing cost, and significant reduction and harmlessness effects. With the limitation of composting and landfill sites and the development of waste incineration technology, the treatment of urban life at home and abroad is currently Garbage tends to be incinerated. Japan, the United States and most European countries have generally adopted the incineration me...

Claims

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Application Information

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IPC IPC(8): A62D3/00
Inventor 汪群慧杨洁王伟薛军
Owner HARBIN INST OF TECH
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