A method for harmless treatment of construction waste polluted by organic pollutants

Abstract

The invention relates to a harmless treatment method for construction waste polluted by organic pollutants. Crush the construction waste polluted by organic pollutants; first pass through a 4-mesh sieve, and then pass the oversize through a 18-mesh sieve to obtain two sets of undersize; flatten the undersize through a 4-mesh sieve to a height of 10-15mm Pile; level off the 18-mesh sieve into a pile with a height of 15-20mm; place the two sets of piles in the microwave equipment in turn, and treat them with microwave irradiation, microwave power 0.8-1kw, microwave irradiation time 10 to 40 minutes; after the microwave irradiation is over, send the construction waste into the ventilation equipment with dust removal device, and cool it to room temperature naturally; the detection and analysis show that the removal rate of organic pollutants is 80% to 95%; the above organic pollutants are Organic matter with a boiling point of 100-400°C. The invention utilizes the thermal effect of microwaves and induced catalysis to degrade and remove the organic pollutants in the polluted construction waste, and has the advantages of good removal effect, short reaction time, less 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of the environmental protection legal system, high-pollution industrial enterprises have been shut down, rectified, and outdated and excess production capacity has been eliminated.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...

Examples

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 in a microwave field with a power of 0.8 kw for 10 minutes.

[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%.

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...

Examples

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 in a microwave field with a power of 0.8 kw for 10 minutes.

[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%.