Heavy metal contaminated soil remediation agent, application thereof and contaminated soil remediation method

A soil remediation agent and a technology for polluted soil, which is applied in the field of heavy metal-contaminated soil remediation agent and its remediation and remediation of contaminated soil, can solve the problems of poor long-term remediation effect, secondary pollution of soil, single heavy metal, etc., and achieve improved adhesion and Water holding capacity, good repairing effect, effect of enhancing ionic strength

CN107282625AInactive Publication Date: 2017-10-24BEIJING GEOENVIRON ENG & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-10-24
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a heavy metal contaminated soil remediation agent, application thereof and a contaminated soil remediation method. The heavy metal contaminated soil remediation agent comprises, by weight, 50-80 parts of sludge, 20-30 parts of biochar, 12-20 parts of organic matter, 10-20 parts of plant ash, 5-10 parts of montmorillonite clay, 5-10 parts of ferroferric oxide, 2-5 parts of sodium chloride and 3-8 parts of sodium phosphate, and preferably, the remediation agent further comprises 1-3 parts of humic acid. The invention further provides application of the heavy metal contaminated soil remediation agent and the contaminated soil remediation method. The heavy metal contaminated soil remediation agent avoids secondary pollution generated during heavy metal contaminated soil remediation, the remediation period is shortened, and the remediation effect is good.
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Description

technical field

[0001] The invention relates to a soil remediation agent, in particular to a heavy metal-contaminated soil remediation agent and its application and a method for remediating polluted soil. Background technique

[0002] Heavy metal pollution of the soil refers to human activities, the content of trace metal elements in the soil exceeds the background value, and the excessive content caused by excessive deposition is collectively referred to as soil heavy metal pollution.

[0003] Heavy metals generally refer to about 60 elements with a specific gravity above 4.0 or about 45 elements with a specific gravity above 5.0. Heavy metals in environmental pollution research mainly refer to elements with significant biological toxicity such as Pb, Cd, Hg, Cr, and metalloid As, and also include heavy metals such as Zn, Cu, Co, Ni, and Sn with certain toxicity. Some heavy metal elements are essential elements for the human body and other organisms, but their concentratio...

Examples

Embodiment 1

[0040] A heavy metal contaminated soil restoration agent, comprising the following components in parts by weight:

[0041]

[0042] Wherein, the sludge is the sludge reaching the standard of the sewage treatment plant, and the humidity of the sludge is 52%.

[0043] The preparation process of biochar is as follows: adding crop stalks and fruit husks into a pyrolysis reactor, raising the temperature to 380°C under anaerobic conditions, performing a pyrolysis carbonization reaction, and reacting for 1.5 hours to obtain biochar.

[0044] The method for repairing heavy metal-contaminated soil by the above-mentioned soil remediation agent comprises the following steps:

[0045] (1) Take sludge, biochar, humus, plant ash, montmorillonite clay, ferric oxide and humic acid in a mixer, stir and mix evenly to obtain a mixture;

[0046] (2) dissolving sodium chloride and sodium phosphate in water to obtain a mixed aqueous solution; wherein, the amount of water used to dissolve sodium...

Embodiment 2

[0051] A heavy metal contaminated soil remediation agent, comprising the following components in parts by weight:

[0052]

[0053] Wherein, the sludge is the sludge reaching the standard of the sewage treatment plant, and the humidity of the sludge is 47%.

[0054] The preparation process of biochar is as follows: adding crop stalks and fruit husks into a pyrolysis reactor, raising the temperature to 365°C under anaerobic conditions, performing a pyrolysis carbonization reaction, and reacting for 1.5 hours to obtain biochar.

[0055] The method for remediating heavy metal-contaminated soil with the above-mentioned soil remediation agent comprises the following steps:

[0056] (1) Take sludge, biochar, humus, plant ash, montmorillonite clay, ferric oxide and humic acid in a mixer, stir and mix evenly to obtain a mixture;

[0057] (2) dissolving sodium chloride and sodium phosphate in water to obtain a mixed aqueous solution; wherein, the amount of water used to dissolve sodi...

Embodiment 3

[0062] A heavy metal contaminated soil restoration agent, comprising the following components in parts by weight:

[0063]

[0064] Wherein, the sludge is the sludge reaching the standard of the sewage treatment plant, and the humidity of the sludge is 40%.

[0065] The preparation process of biochar is as follows: adding fruit shells and wood waste into a pyrolysis reactor, raising the temperature to 350°C under anaerobic conditions, and performing a pyrolysis carbonization reaction for 2 hours to obtain biochar.

[0066] The method for remediating heavy metal-contaminated soil with the above-mentioned soil remediation agent comprises the following steps:

[0067] (1) Take sludge, biochar, humus, plant ash, montmorillonite clay, ferric oxide and humic acid in a mixer, stir and mix evenly to obtain a mixture;

[0068] (2) dissolving sodium chloride and sodium phosphate in water to obtain a mixed aqueous solution; wherein, the amount of water used to dissolve sodium chlorid...