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Recycling method of environment-friendly IDS soil eluting agent

A soil leaching and recycling method technology, which is applied in the field of soil leaching and remediation, can solve problems such as pollution in the Dongdagou watershed, and achieve the effects of simple and easy operation steps and low recovery cost.

Active Publication Date: 2017-08-04
SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The widespread pollution of the Dongdagou watershed has been caused by farmers using polluted river water to irrigate their fields for a long time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1) Use 5% NaOH and 5% HNO 3 The solution is used as a pH regulator to adjust the pH of the polluted soil eluate to 6;

[0023] 2) Take the weight (gram): the volume of the polluted soil eluent (ml) is 4:1 K 2 CO 3 as a precipitant;

[0024] 3) Add 400 grams of K 2 CO 3 Add 100 milliliters of polluted soil eluent, then stir at a rate of 360 rpm at room temperature for 2 hours;

[0025] 4) Stand still for 2 hours, use suction filtration method to filter and remove the sediment;

[0026] 5) add sodium chloride to carry out salting-out, make IDS elutriant generate precipitation;

[0027] 6) Place the solution in a centrifuge tube, centrifuge at a rate of 4000 rpm for 30 minutes, and pour off the supernatant;

[0028] 7) Place the IDS precipitate in an oven, and dry it at 70° C. for 5 hours to obtain the recovered IDS soil washing agent, and the recovery rate of the IDS is over 85%.

Embodiment 2

[0030] 1) Use 5% NaOH and 5% HNO 3 The solution is used as a pH regulator to adjust the pH of the polluted soil eluate to 5.5;

[0031] 2) Take the weight (gram): the volume of the polluted soil eluent (ml) is 4:1 K 2 CO 3 as a precipitant;

[0032] 3) Add 300 grams of K 2 CO 3 Add 75 milliliters of contaminated soil eluents, then stir for 2 hours at a rate of 360 rpm at room temperature;

[0033] 4) Stand still for 2 hours, use suction filtration method to filter and remove the sediment;

[0034] 5) add sodium chloride to carry out salting-out, make IDS elutriant generate precipitation;

[0035] 6) Place the solution in a centrifuge tube, centrifuge at a rate of 4000 rpm for 30 minutes, and pour off the supernatant;

[0036] 7) Place the IDS precipitate in an oven, and dry it at 70° C. for 5 hours to obtain the recovered IDS soil washing agent, and the recovery rate of the IDS is over 85%.

Embodiment 3

[0038] 1) Use 5% NaOH and 5% HNO 3 The solution is used as a pH regulator to adjust the pH of the polluted soil eluate to 6.5;

[0039] 2) Take the weight (gram): the volume of the polluted soil eluent (ml) is 4:1 K 2 CO 3 as a precipitant;

[0040] 3) Add 500 grams of K 2 CO 3 Add 125 milliliters of contaminated soil eluents, then stir for 2 hours at a rate of 360 rpm at room temperature;

[0041] 4) Leave it to stand for 2 hours, and use the suction filtration method to filter and remove the sediment;

[0042] 5) adding sodium chloride to carry out salting out, so that the IDS eluent generates a precipitate;

[0043] 6) Place the solution in a centrifuge tube, centrifuge at a rate of 4000 rpm for 30 minutes, and pour off the supernatant;

[0044]7) Place the IDS precipitate in an oven, and dry it at 70° C. for 5 hours to obtain the recovered IDS soil washing agent, and the recovery rate of the IDS is over 85%.

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Abstract

The invention relates to a recycling method of an environment-friendly IDS soil eluting agent. The recycling method includes: using NaOH and HNO3 solution as the pH regulator to regulate the pH of contaminated soil eluent to about 6; using K2CO3 with a ratio of weight g to contaminated soil eluent volume ml being 4:1 as the precipitator, adding the precipitator into the contaminated soil eluent, and stirring at the speed of 360r / minute under room temperature for 2 hours; standing for 2 hours, and using a suction filtration method to filter and remove precipitate; adding sodium chloride to perform salting out so as to allow the IDS eluting agent to generate precipitate; placing the solution into a centrifugal tube, centrifuging at the speed of 4000r / minute for 30 minutes, and pouring out supernate; drying the IDS precipitate in a drying oven at 70 DEG C for 5 hours to obtain the recycled IDS soil eluting agent. The recycling method has the advantages that the environment-friendly IDS soil eluting agent can be recycled fast, recycling rate reaches 85% or above, and the method is low in recycling cost and simple and practicable in operation procedures.

Description

[0001] [technical field] [0002] The invention relates to the technical field of soil washing and repairing, in particular to a recovery method of an environment-friendly IDS soil washing agent. [0003] [Background technique] [0004] Soil is an important resource for human production and life, and human beings cannot do without soil at all times. In recent years, the problem of soil pollution has become more and more serious, and it has gradually attracted people's attention and has become a key topic of concern. Heavy metal pollution is currently one of the most widespread and most harmful problems in soil pollution. Soil heavy metal pollution has many characteristics, such as concealment, accumulation, hysteresis, long-term, irreversible and refractory. After the soil is polluted by heavy metals, it takes more than 1,000 years to recover to the state before pollution through its own self-purification ability. Heavy metals can cause soil degradation, crop quality and yiel...

Claims

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Application Information

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IPC IPC(8): C07C227/40C07C229/24C09K17/16
Inventor 胡晓钧姜伟杰田富箱
Owner SHANGHAI APPLIED TECHNOLOGIES COLLEGE
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