Disposition method for municipal solid waste incineration fly ash with microwave hydrothermal method applied

A technology of domestic waste incineration and microwave hydrothermal method, applied in chemical instruments and methods, solid waste removal, transportation and packaging, etc., can solve the problems of restricting large-scale application, secondary pollution, unfavorable large-scale application, etc. Achieve the effect of strong heavy metal adsorption capacity, reduction of process water production, and high resource utilization potential

Inactive Publication Date: 2016-11-09
ZHEJIANG UNIV
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Problems solved by technology

Although the former has the advantages of simple process equipment and low price, it also has the disadvantages of poor solidification effect of heavy metals and increased landfill volume, while the latter is not conducive to large-scale application because it is difficult to find a universally applicable chemical stabilizer. Moreover, the dehydration filtrate after fly ash treatment contains soluble salts and suspended heavy metals, which requires secondary treatment, otherwise it is very likely to cause secondary pollution, which is the main reason for restricting the stable and large-scale application of pharmaceuticals
The heat treatment technology has a good performance in immobilizing heavy metals, but due to its high energy consumption, high cost, and high technology characteristics, it cannot be widely used in developing countries such as my country.
The traditional hydrothermal method has great advantages in terms of technology and environment, but the economy is still not good, which is the main obstacle restricting its large-scale application.
[0004] Aiming at the shortcomings of the existing traditional hydrothermal method of insufficient economy, the present invention takes reducing energy consumption, improving efficiency and reducing secondary pollution as the guiding ideology, and proposes a method for applying microwave hydrothermal to domestic waste incineration fly ash, further improving The disadvantages of traditional hydrothermal curing method

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  • Disposition method for municipal solid waste incineration fly ash with microwave hydrothermal method applied

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Raw materials: waste incineration fly ash 1 to be treated, the original leaching concentration of heavy metals in the fly ash is as follows: Cd 1.948mg / l, Cr 2.213mg / l, Cu 64.787mg / l, Ni 1.521mg / l, Pb 7.851mg / l , Zn 124.5mg / l.

[0018] Treatment method: 1, 1.5 mol of Na per kilogram of waste incineration fly ash to be treated 2 HPO 4 and 2l of water, the three were respectively added into a closed container, heated by microwave at 200°C for 10 minutes, and then liquid-solid separation was carried out to obtain a stabilized product. The leaching concentration of heavy metals in the stabilized product was determined by using the solid waste leaching toxicity leaching method-acetic acid buffer solution method (HJ / T300-2007).

[0019] Measurement results: Cd 0.1447 mg / l, Cr 0.1615 mg / l, Cu 19.58 mg / l, Ni 0.4897 mg / l, Pb 0.0765 mg / l, Zn 34.90 mg / l.

[0020] Conclusion: Under this condition, the solidification rate of heavy metals can reach more than 80% on average, and th...

Embodiment 2

[0022] Raw materials: waste incineration fly ash 2 to be treated, the original leaching concentration of excessive heavy metals in the fly ash is as follows: Cd 0.6025mg / l, Pb 0.4639mg / l.

[0023] Treatment method: 1.0mol of Na per kilogram of waste incineration fly ash to be treated 2 HPO 4 and 2L of water, the three were respectively added into a closed container, heated by microwave at 150°C for 10 minutes, and then liquid-solid separation was carried out to obtain a stabilized product. The leaching concentration of heavy metals in fly ash after disposal was determined by the leaching method of solid waste leaching toxicity-acetic acid buffer solution method (HJ / T300-2007).

[0024] Measurement results: Cd 0.1468mg / l, Pb 0.0645mg / l

[0025] Conclusion: The leaching concentrations of all heavy metal ions meet the landfill requirements. Under this condition, the solidification rates of heavy metals Cd and Pb are 76% and 82%, respectively.

Embodiment 3

[0027] Raw material: the stabilized product obtained in Example 1

[0028] Treatment method: the stabilized products obtained in the examples were mixed with a series of different concentrations of HNO 3 Mix with NaOH mixed solution in an ordinary plastic sealed container, the mixing ratio is to add 20l mixed solution per kilogram of stabilized product, and turn the container containing fly ash and mixed solution at a speed of 30 revolutions per minute for 18 hours, and end Afterwards, solid-liquid separation is carried out, and the pH and heavy metal content of the solution are detected.

[0029] Measurement results: when the pH of the solution after separation is 5-13, almost no heavy metals are detected in the solution.

[0030] Conclusion: The stabilized product has strong acid and alkali resistance, high environmental stability, which is very beneficial for landfill disposal, and also provides high feasibility for resource utilization.

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Abstract

The invention discloses a stabilizing method for municipal solid waste incineration fly ash with microwave applied. The stabilized products can be obtained by adding fly ash to be processed, a certain concentration of additive agent and water into a polytetrafluoroethylene container directly and then performing heating by the microwave to solidify heavy metal in the fly ash. After disposed by the method, the leaching concentration of the heavy metal in the fly ash can be far below the limiting value of national standard 16889-2008. By means of the stabilizing method, hazardous wastes such as the municipal solid waste incineration fly ash can be processed efficiently and rapidly to meet the requirements of secure landfill and post resource utilization. The method is simple in technology, convenient to operate, high in heavy metal solidified rate, capable of making up for deficiencies that the conventional hydrothermal disposition is high in energy consumption, long in computing time and the like, and high in practical application potential of large-scale disposition of the municipal solid waste incineration fly ash.

Description

technical field [0001] The invention relates to the fields of microwave heating application and hazardous waste disposal, in particular to a method for stabilizing domestic waste incineration fly ash. Background technique [0002] In the composition of municipal solid waste in my country, the proportion of incineration has increased year by year, and the proportion of municipal solid waste incineration has increased from 5.55% in 2004 to 32.5% in 2014. In 2014, the national waste incineration has reached 53.299 million tons. Domestic waste incineration fly ash (hereinafter referred to as fly ash) contains a large amount of toxic and harmful components such as heavy metals, chlorinated organic compounds, sulfides, and dioxins, and has been included in the "National Hazardous Waste List". Therefore, we must pay attention to incineration fly ash harmless disposal. [0003] At present, the two methods of cement curing and chemical agent stabilization are widely used in our coun...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B2101/30B09B3/25
Inventor 蒋旭光邱琪丽陆胜勇倪明江严建华池涌李晓东马增益金余其王飞黄群星薄拯岑可法
Owner ZHEJIANG UNIV
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