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A passivation repair method for arsenic and cadmium composite polluted soil in agricultural land

A technology of compound pollution and remediation method, which is applied in the field of soil remediation and passivation remediation of arsenic and cadmium compound polluted soil in agricultural land. It can solve problems such as difficult to achieve simultaneous passivation, and achieve the goal of improving physical properties, strong pertinence, and improving soil quality. Effect

Active Publication Date: 2022-07-26
NANJING UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] To sum up, in view of the prominent status quo of soil As and Cd compound pollution, and the defect that the existing remediation technology is difficult to achieve simultaneous passivation, it is necessary to consider the characteristics of different soil pollution, and develop a kind of As and Cd compound polluted soil in a targeted manner. Passivation repair method

Method used

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  • A passivation repair method for arsenic and cadmium composite polluted soil in agricultural land
  • A passivation repair method for arsenic and cadmium composite polluted soil in agricultural land
  • A passivation repair method for arsenic and cadmium composite polluted soil in agricultural land

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Experimental program
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Effect test

Embodiment 1

[0049] according to figure 1 The shown remediation principle, passivation remediation of arsenic-cadmium complex polluted acid soil, includes the following steps:

[0050] S1. Determine the pH range of the best dissolution of As and Cd in soil through the dissolution curve experiment of As and Cd in contaminated soil:

[0051] S1-1. Soil sampling and pretreatment

[0052] The test soil 1 was collected from Yingtan, Jiangxi, with a soil pH of 4.81 (determined by a soil:water ratio of 1:2.5), and the total As and Cd concentrations were 82.82 mg / kg and 8.52 mg / kg, respectively.

[0053] The test soil 2 was collected from Hangzhou, Zhejiang, with a soil pH of 5.33 (determined by a soil:water ratio of 1:2.5), and the total As and Cd concentrations were 125.68 mg / kg and 6.71 mg / kg, respectively.

[0054] Remove the impurities such as plant roots, gravels, etc., and then finely grind it through a 2mm aperture nylon sieve after being air-dried naturally.

[0055] Two groups of test...

Embodiment 2

[0076] according to figure 1 The shown remediation principle, passivation remediation of arsenic and cadmium complex polluted alkaline soil, includes the following steps:

[0077] S1. Determine the pH range of the best dissolution of As and Cd in soil through the dissolution curve experiment of As and Cd in contaminated soil:

[0078] S1-1. Soil sampling and pretreatment

[0079] The test soil 3 was collected from Jiyuan, Henan Province. The soil pH was 7.73 (determined by the soil:water ratio of 1:2.5), and the total As and Cd concentrations were 139.43 mg / kg and 14.56 mg / kg, respectively.

[0080] The test soil 4 was collected from Baoji, Shaanxi Province, with a soil pH of 7.82 (determined by a soil:water ratio of 1:2.5), and the total As and Cd concentrations were 23.49 mg / kg and 73.07 mg / kg, respectively.

[0081] Remove the impurities such as plant roots, gravels, etc., and then finely grind it through a 2mm aperture nylon sieve after being air-dried naturally.

[008...

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Abstract

The invention discloses a passivation restoration method for arsenic and cadmium composite polluted soil of agricultural land, which belongs to the technical field of soil restoration. It includes the following steps: S1. Determine the pH range of the optimum dissolution of As and Cd in the soil through the dissolution curve experiment of As and Cd in the contaminated soil. S2. Determine the addition amount of the acid-base regulator required to adjust the soil pH. S3. According to the pollution degree of As. Determine the amount of zero-valent iron added in the soil sample, S4, soil passivation; then use the scheme determined in steps S1-S4 as a farmland pilot experiment, after understanding the pollution characteristics of the polluted soil, determine the actual field according to the pilot experiment. Experimental fix. The present invention can fully understand the pollution characteristics of the polluted soil by collecting the polluted soil in the tested soil area and carrying out a small-scale experiment, and has strong pertinence. In the lowest pH range of As and Cd in the contaminated soil, the surface adsorption of As and Cd by iron (hydroxide) oxides can simultaneously reduce the bioavailability of As and Cd in the soil, and realize the composite pollution of As and Cd. Simultaneous passivation remediation of farmland soils.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and is particularly suitable for the technical field of passivation remediation of agricultural land arsenic and cadmium composite polluted soil. Background technique [0002] According to the "Soil Environmental Quality Survey Report" released in 2014, my country's soil pollution is mainly inorganic pollution, and the inorganic pollution points exceed the standard rate of 21.7%, of which arsenic (As) and cadmium (Cd) pollution points exceed the standard rate. It is 2.7% and 7.0%, ranking first and third among the types of inorganic pollutants in my country. It can be seen that As and Cd pollution problems are not optimistic. With the acceleration of the industrialization process, due to the discharge of industrial production such as mining, smelting, electroplating, chemical industry, electronics and dyeing and finishing, as well as agricultural activities such as fertilizer and pesticid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 顾雪元曾安容
Owner NANJING UNIV
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