Cadmium fixing agent for treating contaminated soil and treatment method of soil
A technology of polluted soil and treatment methods, applied in the restoration of polluted soil, soil conditioning materials, chemical instruments and methods, etc., can solve the problems of poor treatment effect of heavily polluted soil
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Embodiment 1
[0057] The neutral soil polluted by heavy metal cadmium was air-dried, ground and passed through a 2mm sieve. Weigh the soil under the sieve, weigh the lime according to the soil weight 4.6%, and weigh the charcoal powder with a particle size of 3mm according to the soil weight 2.3%, respectively drop into the soil, and mix to obtain a mixture. Drizzle water with a volume of 35% of the weight of the mixture into the mixture, shake it for 2 hours, make it fully mixed, infiltrate, and place it for 2 days, then weigh 4% of the weight of the soil and put it into the soil, stir well, and place it for 5 days .
[0058] see figure 1 , the effective content of cadmium in the soil before using the cadmium fixative, the content is 6.51mg / kg. The effective content of cadmium in soil after using cadmium fixative was 3.13mg / kg. The pH value of the soil rose from 6.50 to 6.95 before and after treatment. It shows that the fixing agent provided by the invention can effectively reduce the ...
Embodiment 2
[0061] The neutral soil polluted by heavy metal cadmium was air-dried, ground and passed through a 3mm sieve. The soil under the sieve was weighed, the lime was weighed by 4.6% of the soil weight, and the charcoal powder with a diameter of 3 mm was weighed by 4.60% of the soil weight, respectively dropped into the soil, and mixed to obtain a mixture. Drizzle 30% of the volume of water into the mixture, shake it for 2 hours, make it fully mixed, infiltrate, and after standing for 2 days, weigh the plant organic fertilizer according to 3% of the soil weight, put it into the soil, stir evenly, and place it for 5 sky.
[0062] see figure 2 , the effective content of cadmium in the soil before using the cadmium fixative, the content is 6.51mg / kg. The effective content of cadmium in soil after using cadmium fixative was 3.48mg / kg. After treatment, the soil pH value rose from 6.50 to 6.78. It shows that the fixing agent provided by the invention can effectively reduce the conten...
Embodiment 3
[0065] The neutral soil polluted by heavy metal cadmium was air-dried, ground and passed through a 2mm sieve. The soil under the sieve was weighed, the lime was weighed according to 4.0% of the soil weight, and the charcoal powder with a diameter of 3mm was weighed according to 4.5% of the soil weight, respectively dropped into the soil, and mixed to obtain a mixture. Pour 40% of the mixture's weight of water into the mixture, shake it for 2 hours, make it fully mixed, infiltrate, and after standing for 1 day, weigh the plant organic fertilizer according to 2% of the soil weight, put it into the soil, stir evenly, and let it stand 6 days.
[0066] see image 3 , the effective content of cadmium in the soil before using the cadmium fixative, the content is 6.51mg / kg. The effective content of cadmium in soil after using cadmium fixative was 3.39mg / kg. After treatment, the soil pH value rose from 6.50 to 6.62. It shows that the fixing agent provided by the invention can effec...
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