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Remediation agent for heavy metal contaminated soil and preparation method of remediation agent

A technology of polluted soil and remediation agent, applied in the field of soil remediation, can solve problems such as difficult to remediate soil

Inactive Publication Date: 2017-05-10
广东南环生态环境科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has been verified by experiments that the soil remediation agent is difficult to remediate the soil polluted by various heavy metals and organic matter

Method used

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  • Remediation agent for heavy metal contaminated soil and preparation method of remediation agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A heavy metal polluted soil remediation agent contains 35% of biochar, 20% of sepiolite, 10% of solid tartaric acid, 10% of calcium dihydrogen phosphate, 20% of sodium thiosulfate, and natural gypsum as the balance. The biochar is prepared by using the stems and leaves of discarded banana trees as raw materials.

[0028] When remediating soil contaminated by heavy metals, the soil can be broken into particles with a particle size less than or equal to 2mm, and then the heavy metal contaminated soil remediation agent is fully mixed with the contaminated soil at a ratio of 1:25 (dry weight). Add an appropriate amount of water (keep the soil moist), and the restoration can be completed after 20 days. The repair effect is shown in Table 1

Embodiment 2

[0030] A heavy metal polluted soil remediation agent contains 55% of biochar, 10% of sepiolite, 5% of solid oxalic acid, 5% of calcium dihydrogen phosphate, 15% of potassium thiosulfate, and the balance is natural gypsum. The biochar is prepared by using the stems and leaves of discarded banana trees as raw materials.

[0031] The method for repairing the soil polluted by heavy metals is the same as that of Example 1. The restoration effect is shown in Table 1.

Embodiment 3

[0033] A heavy metal polluted soil remediation agent, which contains 45% of biochar, 15% of sepiolite, 8% of solid tartaric acid, 8% of calcium dihydrogen phosphate, 10% of ammonium thiosulfate, 7% of quaternary ammonium salt, The balance is natural gypsum. The biochar is prepared by using the stems and leaves of discarded banana trees as raw materials.

[0034] The method for repairing the soil polluted by heavy metals is the same as that of Example 1. The restoration effect is shown in Table 1.

[0035] Table 1 Comparison table of removal rate of exchangeable harmful components in soil samples

[0036]

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Abstract

The invention discloses a remediation agent for heavy metal contaminated soil and a preparation method of the remediation agent. The remediation agent for the heavy metal contaminated soil is prepared from the following components in percentage by weight: 35 to 55 percent of biochar, 10 to 20 percent of sepiolite, 5 to 10 percent of water-soluble solid organic acid, 5 to 10 percent of monocalcium phosphate, 10 to 20 percent of thiosulfate, and the balance of natural gypsum. The preparation method of the remediation agent for the heavy metal contaminated soil comprises the following steps: preparing the biochar; grinding the prepared biochar, the sepiolite, the water-soluble solid organic acid, the monocalcium phosphate, the thiosulfate and the natural gypsum into particles of which the particle sizes are smaller than or equal to 2mm according to the weight percent, and sufficiently mixing. The remediation agent for the heavy metal contaminated soil, disclosed by the invention, can be used for passivating heavy metals such as mercury, cadmium, lead, chromium and arsenic, and adsorbing and thoroughly degrading organic pollutants in the soil.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and in particular relates to a heavy metal polluted soil remediation agent and a preparation method thereof. Background technique [0002] Soil remediation technologies are generally divided into three categories: physical remediation technology, chemical remediation technology and biological remediation technology (including microbial remediation technology and phytoremediation technology). Because the causes of soil pollution vary widely, and the soil is often polluted by many kinds, in practice, people usually need to comprehensively use physical, chemical, and biological remediation technologies to repair the polluted soil. Specific to mercury (Hg), cadmium (Cd), lead (Pb), chromium (Cr), arsenic (As) and other heavy metal-contaminated soils, chemical remediation technology is the main remediation method, while physical remediation technology and biological remediation Technology al...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08B09C1/10
CPCC09K17/40B09C1/08B09C1/10
Inventor 陈树鹏冯姣陆天才
Owner 广东南环生态环境科技有限公司
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