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Novel technique for harmless treatment of medical refuse burning flyash

A technology of harmless treatment and incineration of fly ash, which is applied in the direction of waste treatment and solid waste removal, and can solve the problems of secondary pollution of the environment and the inability to completely harmless treatment of incineration fly ash

Inactive Publication Date: 2009-08-12
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, about 2%-5% of fly ash will be produced after incineration of medical waste
Because fly ash contains high concentrations of Cd, Pb, Cu, Zn and other harmful heavy metals that can be leached by water, as well as organic poisons such as dioxin and PAH, improper handling will cause serious secondary pollution to the environment
In addition, because medical waste in various parts of my country is incinerated by many different types of incinerators, the properties of fly ash produced by different incineration processes are also different, which has resulted in the current main fly ash treatment technologies in my country such as: cement Solidification methods, chemical extraction methods, etc. cannot completely and harmlessly treat different types of medical waste incineration fly ash

Method used

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  • Novel technique for harmless treatment of medical refuse burning flyash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] In this example, the fly ash produced by the rotary kiln is used for the incineration fly ash of medical waste. The pH of the fly ash is 3.22, and the heavy metal content is 81.5 mg / kg As, 1002 mg / kg Ba, 60.7 mg / kg Cd, and 234 mg / kg Cr , Cu 13g / kg, Pb 11.8g / kg, Zn 37.1g / kg, loss on ignition was 31%. Take 3g of fly ash and mix it with water at a solid-to-liquid ratio of 1:30, add 10ml of H 2 o 2 . Adjust the pH value of the mixed solution to 7.2, then transfer it into a high-pressure reaction kettle, seal it and heat it. When the temperature reaches 450°C and the pressure is stable between 30MPa and 40MPa, start timing, keep it for 1h, and then cool to room temperature. After solid-liquid separation, the reaction residue was measured. The quality of the residue is 35% of the original fly ash addition, and the loss on ignition of the residue is reduced to 0.4%. The heavy metal leaching concentration in the product is measured by the toxicity leaching test (GB5085.3-19...

Embodiment 2

[0010] In this example, the fly ash produced by the pyrolysis gasification furnace was used as the fly ash for medical waste incineration. kg, Cu 2.73g / kg, Pb 4.34g / kg, Zn 48.8g / kg, loss on ignition is 12%. The pH of the fly ash after adding water was 6.84, no need to adjust the pH value, and it was directly treated with supercritical water according to the same treatment method as in Example 1. The quality of the treated residue is 33% of the former fly ash addition, and the loss on ignition of the residue is reduced to 1.53%. The heavy metal leaching concentration in the product is measured by the toxicity leaching test (GB5085.3-1996), and the results show that the heavy metal ( As, Ba, Cd, Cr, Cu, Pb, Zn) leaching amounts are all below the standard value stipulated by the national standard. Treatment of aqueous solution for recycling is the same as case 1.

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Abstract

The invention provides a new technology applicable to decontaminating treatment of flying ash incinerated by a medical waste incinerator. The key point of the technology comprises the steps of mixing the incinerated flying ash with water in a certain solid-to-liquid ratio, adjusting the pH to be approximately neutral, adding a certain amount of oxidant, adding the mixed solution to a high-pressure reaction kettle, raising temperature and pressurizing in a closed manner, keeping for certain time, and then naturally cooling to room temperature, separating the solid and liquid; and the aqueous solution can be recycled. The quality of the processed flying ash residue is obviously reduced, organic pollutants contained in the flying ash are completely degraded, and heavy metals are fixed, thus achieving the aim that the flying ash is decontaminating and can be safely buried or used as resource.

Description

technical field [0001] The invention relates to the harmless treatment and disposal of fly ash from incineration of medical waste, belongs to the pollution control of solid waste in the field of environmental protection, and is especially suitable for the harmless disposal of solid by-products produced during the incineration process of hazardous waste. Background technique [0002] With the rapid development of the economy and the continuous improvement of people's living standards, the amount of medical waste is increasing day by day. In 2003, the outbreak of SARS made the treatment and disposal of medical waste become the focus of social attention. The incineration method has become the main method of treating medical waste in my country because of its good sterilization and reduction effect. However, about 2%-5% fly ash will be produced after incineration of medical waste. Because fly ash contains high concentrations of Cd, Pb, Cu, Zn and other harmful heavy metal subs...

Claims

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Application Information

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IPC IPC(8): B09B3/00
CPCY02W30/20
Inventor 张付申薄达
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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