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Garbage incineration fly ash hazard-free treatment and heavy metal recycling method

A waste incineration fly ash and heavy metal technology, which is applied in the field of environmental engineering, can solve the problems of unfavorable resource utilization of heavy metals, and achieve the effects of high resource utilization performance, simple process, and low energy consumption

Active Publication Date: 2018-02-23
HENAN UNIV OF SCI & TECH
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Problems solved by technology

The complete removal of heavy metals is its advantage. However, the resulting precipitate is a mixture of various metal sulfides, which is not conducive to the subsequent resource utilization of heavy metals.

Method used

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  • Garbage incineration fly ash hazard-free treatment and heavy metal recycling method

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[0023] Domestic waste incineration fly ash was taken from a waste incineration power plant in Shandong. The main heavy metal contents were: Zn 31.3 g / kg, Cu4.83g / kg, Pb 4.04g / kg, Cr 4.01g / kg, Cd 298 mg / kg, Ni 215 mg / kg.

[0024] The specific processing steps are as follows:

[0025] (1) Preparation of recyclable sulfur and bioleaching of domestic waste incineration fly ash

[0026] Commercially available sulfur powder was heated to 120°C on an electric furnace and kept for 20 min. The obtained molten sulfur was poured into distilled water at 20°C while stirring continuously. The molten sulfur formed sulfur balls with a diameter of about 3.0 mm. The sulfur balls are separated from the water and dried at room temperature to obtain recyclable sulfur.

[0027] The biological leaching bacteria are mixed acidophilic sulfur oxidizing bacteria, and the source of the bacteria is the soil around a copper mine in Henan; the composition of the medium is (g / L): KH 2 PO 4 3.0, CaCl 2 ...

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Abstract

The invention belongs to the technical field of environment engineering and particularly relates to a method for separating and recycling heavy metal from garbage incineration fly ash and conducting hazard-free treatment on the fly ash. The method comprises the steps that after the household garbage incineration fly ash is diluted through an acidic sulphur oxidation bacteria culture medium solution, sulphur balls are added, so that acidic leach liquor containing the heavy metal is obtained; after a proper amount of alkali is added for pH adjustment, hydrogen sulfide gas is introduced into theacidic leach liquor; the hydrogen sulfide gas reacts with the heavy metal, so that sulfide precipitation is formed; and after solid-liquid separation is completed, recycling is conducted in the form of the sulfide precipitation, so that the pure heavy metal is obtained. The treatment process is implemented at the normal temperature and normal pressure; energy consumption is low; the process is simple; the large-scale engineering potential is achieved; a biological leaching energy source substance, namely sulphur, is recycled to be reused, so that the post-acidification problem of the treated fly ash is solved; the heavy metal entering the leach liquor is subjected to reduction and precipitation conducted through sulfate, so that the heavy metal is separated or recycled or removed effectively; and the sulfate and pH problems are solved at the same time.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and specifically relates to a method for separating and recovering heavy metals from domestic waste incineration fly ash by using biological leaching technology and realizing harmless fly ash. Background technique [0002] In 2016, my country's urban domestic waste removal volume reached 200 million tons. With the development of economy, the improvement of people's living standards and the continuation of the urbanization process, the generation of urban domestic waste will continue to increase, and waste treatment facilities are facing enormous pressure . At present, there are three main methods of municipal solid waste treatment widely used at home and abroad: landfill, composting, and incineration. Incineration is increasingly popular due to its fast processing speed, small footprint, and remarkable effect of reduction and harmlessness. However, the general incineration of 1...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00
CPCB09B2101/30B09B3/80
Inventor 张瑞昌魏学锋王辉朱书法周鸣
Owner HENAN UNIV OF SCI & TECH
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