Method for restoring copper polluted soil with diethylenetriamine penta(methylene phosphonic acid) (DTPMPA)

Abstract

The invention discloses a method for restoring copper polluted soil with diethylenetriamine penta(methylene phosphonic acid) (DTPMPA), which has the advantages of higher biodegradability and higher rinsing efficiency. The method comprises the following steps: accurately weighing 1.00g of copper polluted soil sample, adding a 10-70% DTPMPA solution in a solid-to-liquid ratio of 1:25, oscillating at room temperature, standing, centrifugating and filtering to complete the rinsing process, wherein the oscillation time is 12 hours, the standing time is 12 hours, the centrifugating speed is 4000 r / min, and the centrifugating time is 20 minutes. The copper concentration of the polluted soil is 800-2975 mg.kg<-1>. By using the DTPMPA for reinforced restoration of the copper polluted soil, the method has the characteristics of high restoration efficiency, high operability, low environmental risk and the like.

Description

technical field

[0001] The invention relates to the technical field of leaching and restoration of copper-contaminated soil, in particular to a method for repairing copper-contaminated soil by using diethylenetriaminepentamethylenephosphonic acid. Background technique

[0002] Cu is an essential trace element for plant growth, participates in many processes such as plant photosynthesis, and plays an important role in the normal growth and development of plants. However, when copper is present in excess in the soil, it can lead to soil degradation and lower crop yields and varieties. The development of mines, the pollution of soil by industrial wastes, the treatment of urban waste, the use of sludge and Cu-containing pesticides (such as Bordeaux mixture) have caused a sharp increase in soil Cu content. Soil copper pollution has increasingly become the focus of attention, and the remediation and treatment of copper-contaminated soil is also a global research topic.

[0003] ...

Examples

Embodiment 1

[0010] Accurately weigh 1.00 g of artificial copper-contaminated soil sample, and the concentration of heavy metal copper in the soil is 800 mg kg -1 According to the solid-to-liquid ratio of 1:25, add DTMPPA solutions with concentrations of 1, 5, 10, 15, 20, 25, and 30%. Shake at room temperature for 12 h, then let stand for 12 h, centrifuge at 4000 r / min for 20 min, filter, and measure the content of heavy metal copper in the supernatant, each treatment is repeated 3 times.

[0011] Table 1 The effect of DTMPPA on the removal rate of heavy metal copper.

[0012] Eluent concentration (%) CK 1 5 10 15 20 25 30 Removal rate (%) 11 34 53 72 82 89 83 80

[0013] The results show that the removal rate of heavy metal Cu can reach up to 89% by oscillating leaching method and using DTMPPA to remediate artificial copper-contaminated soil.

Embodiment 2

[0015] Accurately weigh 1.00 g of artificial copper-contaminated soil sample, and the concentration of heavy metal copper in the soil is 1600 mg kg -1 According to the solid-to-liquid ratio of 1:25, add DTMPPA solutions with concentrations of 10, 20, 30, 40, 50, 60, and 70%. Shake at room temperature for 12 h, then let stand for 12 h, centrifuge at 4000 r / min for 20 min, filter, and measure the content of heavy metal copper in the supernatant, each treatment is repeated 3 times.

[0016] Table 2 The effect of DTMPPA on the removal rate of heavy metal copper.

[0017] Eluent concentration (%) CK 10 20 30 40 50 60 70 Removal rate (%) 13 38 52 65 88 86 86 83

[0018] The results showed that the maximum removal rate of heavy metal Cu reached 88% by oscillating leaching method and using DTMPPA to remediate artificial copper-contaminated soil.

Embodiment 3

[0020] The copper-contaminated soil collected in the Shenyang smelter in 2007 was used for vibration leaching experiments, and the copper concentration was 2975 mg kg -1 . Accurately weigh 1.00 g of contaminated soil samples, and add DTMPPA solutions with concentrations of 10, 20, 30, 40, 50, 60, and 70% according to the solid-to-liquid ratio of 1:25. Shake at room temperature for 12 h, then let stand for 12 h, centrifuge at 4000 r / min for 20 min, filter, and measure the content of heavy metal copper in the supernatant, each treatment is repeated 3 times.

[0021] Table 3 The effect of DTPMPA on the removal rate of heavy metal copper.

[0022] Eluent concentration (%) CK 10 20 30 40 50 60 70 Removal rate (%) 13 33 42 54 63 78 86 83

[0023] The results show that the removal rate of heavy metal Cu can reach up to 86% by using DTMPPA to remediate the copper-contaminated soil in Shenyang smelter by means of oscillation leaching.

[0024] It...

technical field

[0001] The invention relates to the technical field of leaching and restoration of copper-contaminated soil, in particular to a method for repairing copper-contaminated soil by using diethylenetriaminepentamethylenephosphonic acid. Background technique

[0002] Cu is an essential trace element for plant growth, participates in many processes such as plant photosynthesis, and plays an important role in the normal growth and development of plants. However, when copper is present in excess in the soil, it can lead to soil degradation and lower crop yields and varieties. The development of mines, the pollution of soil by industrial wastes, the treatment of urban waste, the use of sludge and Cu-containing pesticides (such as Bordeaux mixture) have caused a sharp increase in soil Cu content. Soil copper pollution has increasingly become the focus of attention, and the remediation and treatment of copper-contaminated soil is also a global research topic.

[0003] ...

Examples

Embodiment 1

[0010] Accurately weigh 1.00 g of artificial copper-contaminated soil sample, and the concentration of heavy metal copper in the soil is 800 mg kg -1 According to the solid-to-liquid ratio of 1:25, add DTMPPA solutions with concentrations of 1, 5, 10, 15, 20, 25, and 30%. Shake at room temperature for 12 h, then let stand for 12 h, centrifuge at 4000 r / min for 20 min, filter, and measure the content of heavy metal copper in the supernatant, each treatment is repeated 3 times.

[0011] Table 1 The effect of DTMPPA on the removal rate of heavy metal copper.

[0012] Eluent concentration (%) CK 1 5 10 15 20 25 30 Removal rate (%) 11 34 53 72 82 89 83 80

[0013] The results show that the removal rate of heavy metal Cu can reach up to 89% by oscillating leaching method and using DTMPPA to remediate artificial copper-contaminated soil.

Embodiment 2

[0015] Accurately weigh 1.00 g of artificial copper-contaminated soil sample, and the concentration of heavy metal copper in the soil is 1600 mg kg -1 According to the solid-to-liquid ratio of 1:25, add DTMPPA solutions with concentrations of 10, 20, 30, 40, 50, 60, and 70%. Shake at room temperature for 12 h, then let stand for 12 h, centrifuge at 4000 r / min for 20 min, filter, and measure the content of heavy metal copper in the supernatant, each treatment is repeated 3 times.

[0016] Table 2 The effect of DTMPPA on the removal rate of heavy metal copper.

[0017] Eluent concentration (%) CK 10 20 30 40 50 60 70 Removal rate (%) 13 38 52 65 88 86 86 83

[0018] The results showed that the maximum removal rate of heavy metal Cu reached 88% by oscillating leaching method and using DTMPPA to remediate artificial copper-contaminated soil.

Embodiment 3

[0020] The copper-contaminated soil collected in the Shenyang smelter in 2007 was used for vibration leaching experiments, and the copper concentration was 2975 mg kg -1 . Accurately weigh 1.00 g of contaminated soil samples, and add DTMPPA solutions with concentrations of 10, 20, 30, 40, 50, 60, and 70% according to the solid-to-liquid ratio of 1:25. Shake at room temperature for 12 h, then let stand for 12 h, centrifuge at 4000 r / min for 20 min, filter, and measure the content of heavy metal copper in the supernatant, each treatment is repeated 3 times.

[0021] Table 3 The effect of DTPMPA on the removal rate of heavy metal copper.

[0022] Eluent concentration (%) CK 10 20 30 40 50 60 70 Removal rate (%) 13 33 42 54 63 78 86 83

[0023] The results show that the removal rate of heavy metal Cu can reach up to 86% by using DTMPPA to remediate the copper-contaminated soil in Shenyang smelter by means of oscillation leaching.

[0024] It...