A method for microbial solidification and stabilization of domestic waste incineration fly ash

A waste incineration fly ash and domestic waste incineration technology, which is applied in the field of hazardous solid waste disposal, can solve the problems of high post-disposal costs, harmful heavy components, and unstable effects, achieving low processing costs, stable fly ash, and avoiding secondary waste. The effect of secondary pollution

Active Publication Date: 2020-11-10
NANJING FORESTRY UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0023] Technical problems: The existing waste incineration fly ash solidification stabilization technology has problems such as high energy consumption, high processing cost, obvious capacity increase and weight gain, and some methods will also cause secondary pollution, high post-processing cost, and unstable effect. The purpose of the present invention is to overcome these defects, apply the technology of microorganism-induced mineralization to solidify and stabilize municipal solid waste incineration fly ash, cement and solidify loose waste incineration fly ash particles, and fix harmful heavy components such as metal ions and dioxins in it at the same time , solve the problem of fixing harmful heavy components and solidifying the fly ash of municipal solid waste incineration, and solve the problem of harmless treatment of fly ash of municipal solid waste incineration with a more ecological, environmentally friendly, energy-saving and economical method

Method used

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  • A method for microbial solidification and stabilization of domestic waste incineration fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this example, a method for microbial solidification and stabilization of domestic waste incineration fly ash, the steps of the method are as follows:

[0037] a. Mix the waste incineration fly ash and the bacterial liquid evenly according to the weight ratio of 1:0.7, and let it stand for 1 hour, so that the microorganisms in the bacterial liquid are adsorbed on the surface of the waste incineration fly ash particles;

[0038] b. Mix the waste incineration fly ash mixed with the bacteria liquid and the reaction solution according to the weight ratio of 1:0.5 to evenly make the fly ash mixture 1, and put it into the bottom permeable mold 2;

[0039] c. Apply 10kPa air pressure 3 to the top of the fly ash mixture 1, remove the air pressure 3 after 4 hours, and let it stand for 24 hours to induce the microorganisms to produce carbonate minerals, fix harmful substances in the waste incineration fly ash and form strength;

[0040] d. Collect and filter the exudate 4 flowi...

Embodiment 2

[0045] In this example, a method for microbial solidification and stabilization of domestic waste incineration fly ash, the steps of the method are as follows:

[0046] a. Mix the waste incineration fly ash and the bacterial liquid evenly according to the weight ratio of 1:0.6, and let it stand for 1 hour, so that the microorganisms in the bacterial liquid are adsorbed on the surface of the waste incineration fly ash particles;

[0047] b. Mix the waste incineration fly ash mixed with the bacteria liquid and the reaction solution according to the weight ratio of 1:0.4 to evenly make the fly ash mixture 1, and put it into the bottom permeable mold 2;

[0048] c. Apply 55kPa air pressure 3 to the top of the fly ash mixture 1, remove the air pressure 3 after 3 hours, and let it stand for 18 hours to induce the microorganisms to produce carbonate minerals, fix harmful substances in the waste incineration fly ash and form strength;

[0049] d. Collect and filter the exudate 4 flowi...

Embodiment 3

[0054] In this example, a method for microbial solidification and stabilization of domestic waste incineration fly ash, the steps of the method are as follows:

[0055] a. mix the waste incineration fly ash and the bacterial liquid according to the weight ratio of 1:0.5, and let it stand for 1 hour, so that the microorganisms in the bacterial liquid are adsorbed on the surface of the waste incineration fly ash particles;

[0056] b. Mix the waste incineration fly ash mixed with the bacteria solution and the reaction solution according to the weight ratio of 1:0.3 and mix evenly to make the fly ash mixture 1, and put it into the bottom permeable mold 2;

[0057] c. Apply 100kPa air pressure 3 to the top of the fly ash mixture 1, remove the air pressure 3 after 2 hours, and let it stand for 12 hours to induce microorganisms to produce carbonate minerals, fix harmful substances in the waste incineration fly ash and form strength;

[0058] d. Collect and filter the exudate 4 flowi...

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Abstract

The invention discloses a method for solidifying and stabilizing domestic waste incineration fly ash through microorganisms and belongs to the technical field of dangerous solid waste treatment. The method is used for solving the harmless disposing problem of urban domestic waste incineration fly ash. According to the method, the waste incineration fly ash and a bacterium solution are mixed according to the weight ratio of 1:0.5-0.7 and are subjected to standing; then the mixture is mixed with a reaction solution to form a fly ash mixture 1, wherein the reaction solution is formed by mixing asparaginate and CaC12 with water added; the fly ash mixture 1 is loaded to a die 2 with a water passing bottom, and air pressure (3) ranging from 10 kPa to 100 kPa is exerted on the top of the die 2; and the air pressure (3) is unloaded after 2 h to 4 h, and standing is conducted for 12 h to 24 h. Biological enzyme generated by the microorganisms is used for hydrolyzing asparaginate to generate calcium carbonate and heavy metal carbonate mineralization materials in an induction manner, harmful substances in the solid waste incineration fly ash are fixed, strength is formed, exudation liquid inthe solidification process is collected and then recycled, ammonia discharging is reduced, and solidification and stabilization of the domestic waste incineration fly ash are achieved.

Description

technical field [0001] The invention relates to solidifying and stabilizing the fly ash of municipal solid waste incineration by using microbial technology to realize the harmlessness of the fly ash of municipal solid waste incineration, and belongs to the technical field of hazardous solid waste disposal. Background technique [0002] Incineration ash is an inevitable by-product in the process of municipal waste incineration. How to deal with the ash is a major problem in the current domestic waste incineration. The ash produced by waste incineration includes bottom slag and fly ash. Bottom slag is the residue after municipal solid waste is burned in the incinerator, and fly ash refers to the residue collected in the flue gas purification system and heat recovery and utilization system. The dissolved salt content of fly ash is 40%-60% higher. Fly ash absorbs most of the harmful substances in the flue gas, mainly including leached heavy metals such as Cd, Pb, Zn and Hg, and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00
Inventor 邵光辉陈欣刘鹏
Owner NANJING FORESTRY UNIV
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