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Acid mine drainage/refuse incineration fly ash coupled stabilization treatment method

A technology of waste incineration fly ash and mine acid wastewater, applied in the field of environmental chemistry

Inactive Publication Date: 2015-12-02
ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The invention discloses a coupling stabilization treatment method for mine acid wastewater and garbage incineration fly ash, and at the same time solves the problem of harmless and stable treatment of two hazardous wastes, mine acid wastewater and garbage incineration fly ash

Method used

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  • Acid mine drainage/refuse incineration fly ash coupled stabilization treatment method
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  • Acid mine drainage/refuse incineration fly ash coupled stabilization treatment method

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Embodiment 1

[0021] The initial pH of the mine acid wastewater is 2.33. By adding the waste incineration fly ash, the pH rises continuously, and it rises slowly around the pH of 3-4 until the fly ash dosage is greater than 15g, and the pH continues to rise. When the dosage reaches 24g The pH was 10.4 and then gradually leveled off to a final pH of about 11. figure 2 The graph shows the change of fly ash dosage and wastewater pH value, in which pH does not increase linearly with the increase of fly ash dosage around 3-4, because Fe in the wastewater does not increase linearly. 3+ Precipitated as Fe(OH) 3 When , a large amount of OH- is consumed, so that within a certain range, the pH value in the wastewater is kept unchanged.

Embodiment 2

[0023] refer to as figure 1 As shown in the process flow chart, under normal temperature and normal conditions, take the acid wastewater of a mine mainly composed of pyrite veins, and its heavy metal elements are mainly Cu, Zn, Cd, Mn, Pb; the initial pH of the wastewater is 2.33, while stirring Add waste incineration fly ash, adjust the pH to about 4 first, and set aside for precipitation and separation; then add waste incineration fly ash to adjust the pH to about 7, and set aside for precipitation separation; then adjust to pH 11, settling, standing and separating;

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Abstract

The invention discloses an acid mine drainage / refuse incineration fly ash coupled stabilization treatment method which comprises the following steps: (1) under the conditions of normal temperature and pressure, taking acid mine drainage, adding refuse incineration fly ash in the stirring process to regulate the pH value to 3-5, standing, and carrying out precipitation separation to obtain a clear solution and sludge; (2) adding refuse incineration fly ash into the clear solution obtained in the step (1) to regulate the pH value to neutrality, standing, and carrying out precipitation separation to obtain a clear solution and sludge; (3) adding refuse incineration fly ash into the clear solution obtained in the step (2) to regulate the pH value of the clear solution to 10-12, standing, carrying out precipitation separation to obtain a clear solution and sludge, regulating the clear solution to neutrality, and discharging; and (4) mixing the sludge obtained in the steps (1)-(3), adding a heavy metal stabilizer, uniformly mixing and standing. The weak alkalinity of the refuse incineration fly ash is utilized to perform neutralization pretreatment on the acid mine drainage. The pH value is regulated to near neutrality, and advanced treatment is performed to implement stabilization treatment on the acid drainage and fly ash.

Description

technical field [0001] The invention relates to the field of environmental chemistry, in particular to a method for coupling, stabilizing and co-disposing of mine acid waste water and waste incineration fly ash. Background technique [0002] With the acceleration of the urbanization process and the continuous improvement of people's material level, the amount of domestic waste is increasing day by day, with an annual growth rate of 8% to 10%. Incineration can reduce the volume of garbage by 90%, and has the advantages of fast processing speed, small footprint, high efficiency of reduction and harmlessness, and can be recycled as resources. The waste incineration fly ash is weakly alkaline (pH ≈ 11), contains a large amount of heavy metals and organic pollutants, and is a hazardous waste specified by the national standard (GB18485-2001). main way out. However, after the fly ash solidifies and enters the landfill, the contradiction between the capacity of the landfill and th...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/10
Inventor 孙福成张佳萍戚路赵浙卿冯一舰孙璐
Owner ENVIRONMENTAL SCI RES & DESIGN INST OF ZHEJIANG PROVINCE
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