Harmless treatment method for building waste polluted by organic pollutants
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A technology for the harmless treatment of organic pollutants, applied in the field of environmental engineering, to achieve the effects of low energy consumption, wide application range and short treatment period
Inactive Publication Date: 2016-04-06
TONGJI UNIV
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Problems solved by technology
However, there is no method for removing organic pollutants from construction waste using microwave irradiation
Method used
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Examples
Experimental program
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Effect test
Embodiment 1
[0015] A. Use a jaw crusher or other crushers to crush construction waste polluted by polycyclic aromatic hydrocarbon phenanthrene (boiling point 340°C), and use 4-mesh and 18-mesh vibrating screens to screen the crushed construction waste polluted by organic pollutants. First pass through a 4-mesh sieve, and then pass the undersize through a 18-mesh sieve to obtain two sets of undersize; the oversize of the 4-mesh sieve returns to the crusher to continue crushing and then sieves.
[0016] B. Level off the undersize of 4 mesh sieve and the top of 18 mesh sieve into a pile with a height of 15-20 mm; level the undersize of 18 mesh sieve into a pile of 10 to 15 mm in height;
[0017] C, the two groups of heaps of step B are placed in the microwave equipment successively, treated with microwave irradiation, and irradiated in a microwave field with a microwave power of 0.8kw for 35min;
[0018] D. After the microwave irradiation, the construction waste was sent to the ventilation e...
Embodiment 2
[0020] Using the same method as in Example 1, the construction waste polluted by 1,3,5-trichlorobenzene (boiling point 208.5°C) was crushed and sieved to obtain two groups of undersieves;
[0021] Using the same method as in Example 1, the heights of the two groups of undersize heaps were leveled to 15-20 mm and 10-15 mm; placed in microwave equipment, and irradiated in a microwave field with a power of 0.8 kw for 20 minutes.
[0022] The detection and analysis of construction waste polluted by 1,3,5-trichlorobenzene before and after microwave irradiation treatment shows that the removal rate of 1,3,5-trichlorobenzene is 90%-95%.
Embodiment 3
[0024] The crushing, sieving and stacking are the same as in Example 1, and the organic pollutant is phorate (boiling point 120° C.); it is placed in microwave equipment and irradiated for 10 minutes in a microwave field with a power of 0.8 kw.
[0025] The detection and analysis of construction waste polluted by phorate before and after microwave irradiation showed that the removal rate of phorate was 85%-95%.
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Abstract
The invention relates to a harmless treatment method for building waste polluted by organic pollutants. The building waste polluted by the organic pollutants is crushed and screened by a four-mesh sieve; oversize products are screened by an 18-mesh sieve, and two sets of undersize products are obtained; the undersize products screened through the four-mesh sieve are flattened into a pile with the height of 10-15 mm; the undersize products screened through the 18-mesh sieve are flattened into a pile with the height of 15-20 mm; the two sets of piles are sequentially arranged in microwave equipment to be subjected to microwave irradiation treatment, the microwave power is 0.8-1 kw, and the microwave irradiation time is 10-40 min; after microwave irradiation is over, the building waste is sent into a ventilation device with a dust removing device and naturally cooled to the room temperature; and detection analysis is carried out, and the removing rate of the organic pollutants is 80%-95%, wherein the organic pollutants are organic matter with the boiling point of 100-400 DEG C. The organic pollutants in the polluted building waste are degraded through the heat effect of microwaves and the induction catalytic action, and the method has the advantages of being good in removing effect, short in reaction time, little in secondary pollution and the like.
Description
technical field [0001] The invention relates to a harmless treatment method for construction waste polluted by organic pollutants, belonging to the field of environmental engineering. Background technique [0002] With the rapid development of the economy and the strengthening of the environmental protection legal system, high-pollution industrial enterprises have been shut down, rectified, and outdated and excess production capacity has been eliminated. A large amount of industrial construction waste has been generated during the demolition and rectification of abandoned factories and workshops. They are different from ordinary residential commercial construction waste. , which contains a large amount of toxic and harmful substances such as heavy metals, inorganic compounds and organic substances. These polluted construction wastes will be directly landfilled or reused without treatment, which will cause pollution and damage to the environment. [0003] At present, there i...
Claims
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Application Information
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