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Method for improving bioleaching effect of municipal solid waste incineration flying ash

A municipal solid waste and biological leaching technology, which is applied in the field of heavy metal removal effect, can solve the problems affecting the metal dissolution effect, and achieve the effect of improving the heavy metal dissolution rate, high efficiency, and easy operation

Inactive Publication Date: 2009-10-14
UNIV OF SCI & TECH BEIJING
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AI Technical Summary

Problems solved by technology

In the process of bioleaching, a large part of the metal oxides wrapped in the Si-O lattice is difficult to fully contact with the bacterial metabolites-organic acids, which affects the metal dissolution effect

Method used

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  • Method for improving bioleaching effect of municipal solid waste incineration flying ash
  • Method for improving bioleaching effect of municipal solid waste incineration flying ash
  • Method for improving bioleaching effect of municipal solid waste incineration flying ash

Examples

Experimental program
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Effect test

Embodiment 1

[0022] (1) Biological desilication of fly ash using silicate bacteria

[0023] (a) Pick a ring of the activated silicate bacteria SDB6 slant strain and inoculate it into 50 mL of seed culture medium, and incubate at 28° C. and 180 r / min constant temperature shaking for 48 hours. Wherein, the composition of silicate bacteria seed culture medium is: sucrose 5.0g / L, yeast powder 1.0g / L, K 2 HPO 4 2.0g / L, MgSO 4 ·7H 2 O 0.5g / L, CaCO 3 0.1g / L, FeCl 3 ·6H 2 O 0.005g / L, pH 8.0.

[0024] (b) the seed liquid (a) is inserted in the silicate bacteria liquid medium with a volume ratio of 2% (v / v), and the liquid filling amount of the medium is controlled at 20% (v / v) of the culture container, Under the conditions of temperature 30° C. and rotational speed 180 r / min, constant temperature shaking culture was carried out for 3 days. Then, 10 g / L fly ash was added to the Erlenmeyer flask for desiliconization treatment for 5 days. Among them, the composition of silicate bacteria liq...

Embodiment 2

[0030] (a) the steps are the same as in Example 1; (b) the seed liquid (a) is inserted in the silicate bacteria liquid culture medium with a volume ratio of 2% (v / v), and the liquid filling amount of the culture medium is controlled at 20% (v / v) of the container was cultured with constant temperature shaking at a temperature of 25° C. and a rotation speed of 150 r / min for 5 days. Then, 20 g / L fly ash was added to the Erlenmeyer flask for desiliconization for 5 days. Wherein, the composition of the silicate bacteria liquid medium is the same as that in Example 1, and the pH value of the medium is adjusted to 7.5. (c) and (d) steps are all identical with embodiment 1. image 3 Indicates the leaching rate of heavy metals in the bioleachate of non-desiliconized fly ash and desiliconized fly ash. It can be seen that the bioleaching effect of heavy metals in desiliconized fly ash is significantly higher than that of non-desiliconized fly ash.

[0031] Table 1 Non-desiliconized fly...

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Abstract

A method for improving bioleaching effect of municipal solid waste incineration flying ash relates to a method for leaching the heavy metal in the waste incineration flying ash by the combination of biological desiliconization and bioleaching. The specific steps include: using silicate bacteria to conduct biological desiliconization treatment on the flying ash and damaging the mineral crystal lattice in the flying ash to release more metal oxide; and using Aspergillus niger to conduct bioleaching on the flying ash after the desiliconization treatment, thus remarkably improving the leaching effect of heavy metal in the bioleaching process due to the full contact reaction between more heavy metal oxide and the organic acid generated by the Aspergillus niger. The method is simple and convenient in operation, high in efficiency, economical and feasible and safe, is an environment-friendly effective method for removing the heavy metal in waste incineration flying ash; and leaching toxicity thereof is far lower than the authentication standard of hazardous wastes and the flying ash can enter a landfill yard or is prepared for further resource recycling.

Description

technical field [0001] The invention relates to a method for improving the heavy metal removal effect in the biological leaching treatment of municipal solid waste incineration fly ash. Background technique [0002] With the continuous rapid growth of China's economy and the rapid improvement of people's living standards, the problem of municipal solid waste disposal has become one of the most serious public hazards in China. Therefore, the rapid development of waste incineration power generation technology in China has also brought about a significant increase in the output of waste fly ash. [0003] A large amount of ash is produced in the process of waste incineration, including slag (80-90%) and fly ash (10-20%), but the content of heavy metals in fly ash is several times or even hundreds of times larger than that of slag. The heavy metals in fly ash mainly come from waste paper, waste batteries, building decoration materials, and road cleaning garbage in daily life. In...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B7/02C12N1/20C12N1/14C12R1/685
CPCY02P10/20
Inventor 汪群慧杨洁李华吴庭吉
Owner UNIV OF SCI & TECH BEIJING
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