Heavy-metal-polluted soil remediating method
A technology of pollution remediation and remediation method, applied in the field of soil remediation, to achieve the effects of reducing mobility and toxicity, simple remediation method, and remediation of heavy metal pollution in soil
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[0015] Example 1
[0016] A soil heavy metal pollution remediation method, the remediation method includes the following steps:
[0017] (1) Add 4.5kg of ethylene glycol and 2.5kg of ethylenediamine to 3.22kg of polyvinyl alcohol fiber in sequence, and react under reflux for 1h under stirring to obtain an intermediate product; after washing the intermediate product with water, add 1.5kg of ethylene glycol and 6.75 kg of aminopyridine and 1.25 kg of ethyl chloride mixed solution, react for 30 min under stirring at room temperature, and then wash the product with water, hydrochloric acid, and water to neutrality in sequence after the end, to obtain ion exchange fiber;
[0018] (2) Add the above-mentioned ion-exchange fiber to 350mm particle size attapulgite powder in a weight ratio of 3:1.2 to obtain a mixture, which is rolled into a block of 1.5m*1.5m*10cm, and buried Enter the soil contaminated by heavy metals at a depth of 25 cm, and then remove it from the soil after 30 days of ad...
Example Embodiment
[0019] Example 2
[0020] (1) Add 4.5kg of ethylene glycol and 2.5kg of ethylenediamine to 3.22kg of polyvinyl alcohol fiber in sequence, and react under reflux for 1h under stirring to obtain an intermediate product; after washing the intermediate product with water, add 1.5kg of ethylene glycol and 6.75 kg of aminopyridine and 1.25 kg of ethyl chloride mixed solution, react for 30 min under stirring at room temperature, and then wash the product with water, hydrochloric acid, and water to neutrality in sequence after the end, to obtain ion exchange fiber;
[0021] (2) Add the above-mentioned ion exchange fiber to the attapulgite powder in a weight ratio of 2:1.5 to obtain a mixture, which is rolled into a strip of 2m*1m*10cm, and the depth is 15cm heavy metal contamination It is removed from the soil after 20 days of adsorption and exchange.
Example Embodiment
[0022] Example 3
[0023] (1) Add 3.5kg of ethylene glycol and 2.5kg of ethylenediamine to 3.5kg of polyvinyl alcohol fibers in sequence, and reflux for 50min under stirring to obtain an intermediate product; after washing the intermediate product with water, add 1.5kg of ethylene glycol and 6.75 kg of aminopyridine and 1.25 kg of ethyl chloride mixed solution, react for 25 minutes under stirring at room temperature, and then wash the product with water, hydrochloric acid, and water to neutrality in sequence to obtain ion exchange fiber;
[0024] (2) Add the above-mentioned ion exchange fiber to the attapulgite powder in a weight ratio of 4:1 to obtain a mixture, which is packed in a 25-mesh nylon mesh bag and buried in the soil contaminated by heavy metals at a depth of 35 cm , After 60 days of adsorption, exchange, and then removed from the soil.
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