A method for repairing arsenic-contaminated farmland soil by using dewatered sludge and biochar compound passivator

A technology for dewatering sludge and biochar, which is used in the restoration of polluted soil and other directions

Active Publication Date: 2020-11-13
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no precedent for the combined use of dewatered sludge and biochar passivation to treat arsenic-contaminated farmland soil.

Method used

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  • A method for repairing arsenic-contaminated farmland soil by using dewatered sludge and biochar compound passivator
  • A method for repairing arsenic-contaminated farmland soil by using dewatered sludge and biochar compound passivator
  • A method for repairing arsenic-contaminated farmland soil by using dewatered sludge and biochar compound passivator

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A method for repairing arsenic-contaminated farmland soil by using dewatered sludge and biochar composite passivator, comprising the following steps:

[0027] The amount of the compound passivator of dewatered sludge and biochar is shown in Table 1. The compound passivator of dewatered sludge and biochar was added to the arsenic-contaminated farmland soil with an arsenic concentration of 37.95 mg / kg, and stirred evenly , cultivated for 40 days under the condition of temperature of 25±1°C and soil water content of 70% to 80%, that is, passivation for 40 days, to complete the restoration of arsenic-contaminated farmland soil.

[0028] In this example, the compound passivator of dewatered sludge and biochar is prepared by mixing dried sludge and biochar, wherein the mass ratio of dried sludge and biochar is 10:1.

[0029] In this example, the dried sludge used was prepared by the following method: drying the dewatered sludge at 60° C. for 2 days, grinding, and passing thro...

Embodiment 2

[0039] A method for repairing arsenic-contaminated farmland soil using a compound passivator of dewatered sludge and biochar. Compared with Example 1, the only difference is that the mass ratio of dried sludge and biochar in Example 2 is 2:1 .

[0040] During the cultivation process, soil samples of 1 day, 5 days, 10 days, 20 days and 40 days were collected.

[0041] A five-step continuous extraction method was used to analyze the form and content of arsenic in the soil samples of the treatment group and the control group collected at different times. The total amount of arsenic in each form was taken as the bioavailable arsenic concentration, and the results are shown in Table 1.

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Abstract

The invention discloses a method for remediation of field oil polluted by arsenic using a dewatered sludge and biochar compounded deactivator. The method comprises the steps that deactivating is conducted by mixing the dewatered sludge and biochar compounded deactivator and the field oil polluted by the arsenic to complete the remediation of the field soil pollutedby the arsenic, wherein the dewatered sludge and biochar compounded deactivator is prepared after dewatered sludge and biochar are mixed. The method has the advantages that the deactivating remediation is conducted by using the compounding of the dewatered sludge and the biochar so that the dual purposes of arsenic pollution remediation and soil quality improvement can be achieved, farming season tillage is not influenced, the demands on technological control are not strict, the operability is high, the technology is simple, the obtaining of raw materials is easy, the cost is low, the remediation effect is good and the popularization is easy, and the method has higher practical value and better application prospects.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal-contaminated soil, and relates to a method for remediating arsenic-contaminated farmland soil, in particular to a method for remediating arsenic-contaminated farmland soil by using a compound passivator of dewatered sludge and biochar. Background technique [0002] The problem of arsenic pollution in farmland has become a major ecological and environmental issue of widespread concern in my country, because arsenic (As) is a metalloid with significant toxicity, which seriously threatens the ecological safety of the agricultural environment and human health. In particular, food arsenic poisoning incidents in many areas in recent years reflect the deterioration of farmland soil environmental quality and the increasing pollution problems, which seriously restrict the sustainable development of modern agriculture in my country. Therefore, it is urgent to remediate arsenic pollution in farmland...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/08
Inventor 李忠武黄梅文佳骏杨仁徐卫华罗宁临丁翔曾光明
Owner HUNAN UNIV
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