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A lead-contaminated soil remediation agent and its engineering application method
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A technology for lead-contaminated soil and engineering application, applied in the field of lead-contaminated soil remediation agent and engineering application, can solve the problems of liquid agent irritating odor, agent environmental pollution, corrosion, etc., achieve long-term stable effect, good repair effect, and environmental protection friendly effect
Active Publication Date: 2021-02-05
BCEG ENVIRONMENTAL REMEDIATION CO LTD
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Chinese Patent Application Publication No. CN105482823A discloses a remediation agent for high-concentration lead-contaminated soil and its application method. The agent components include sodium sulfide and sodium polysulfide. These two substances are dangerous chemicals, corrosive, and easy to produce toxic hydrogen sulfide gas
In practical application, the transportation procedure is complicated and the use process has a great negative impact on the health of the surrounding people, which is not conducive to engineering application
Chinese Patent Application Announcement No. CN104673321A introduces a heavy metal solidification stabilizer, including modified carbon black, bone powder, heat-treated montmorillonite and limestone. The solidification and stabilization effect is poor, and it is far from meeting the requirements of the acetic acid buffer solution leaching method or in-situ backfilling for Pb-contaminated soil remediation.
Chinese Patent Application Publication No. CN105694901A discloses a high lead-containing soil remediation agent. The agent is composed of powder and liquid. During use, the powder and liquid need to be uniformly mixed with the soil. The mixing is difficult, the operation is complicated, and the construction cost is high. And the liquid has a pungent smell, which is not conducive to the occupational health of the on-site personnel
The existing repair agents have the following problems: the preparation process of the modified materials is complicated and the cost is high; The effect is poor, and it is difficult to achieve the strict restoration goals at this stage; the long-term monitoring data is lacking, and the long-term effect is difficult to determine; the project implementation process is complicated, and special medicine-soil mixing equipment is required
Therefore, the use of most Pb-contaminated soil remediation agents is limited at this stage
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Embodiment 1
[0046] Restoration agent: the raw material disodium hydrogen phosphate, light-burned magnesia and Portland cement are compounded according to the mass ratio of disodium hydrogen phosphate 18%, light-burned magnesia 8%, ordinary Portland cement 65%, and corn straw powder 9%. Combined to get the repair potion.
[0047] Engineering application method:
[0048] Step 1: Investigation and evaluation of soil Pb pollution degree
[0049] The total amount of Pb in the soil was 39000mg / kg, and the leaching concentration was 82.90mg / L. The results of Tessier five-state analysis showed that the proportion of Pb in each form was: exchangeable state 2.90%, carbonate binding state 39.88%, iron Manganese oxide bound state is 1.18%, organic bound state is 9.31%, and residue state is 46.37%.
[0050] Step 2: Determine the dosing ratio of the agent
[0051] In this example, after the remediation reaches the standard, the soil enters the sanitary landfill for landfill disposal. After the remed...
Embodiment 2
[0066] Restoration agent: the raw material disodium hydrogen phosphate, heavy magnesium oxide, ordinary Portland cement, and rice straw powder are 10% of disodium hydrogen phosphate, 5% of heavy magnesium oxide, 70% of Portland cement, The repair agent can be obtained by compounding 15% of rice straw powder.
[0067] Engineering application method:
[0068] Step 1: Investigation and evaluation of soil Pb pollution degree
[0069] The total amount of Pb in the soil was 12800mg / kg and the leaching concentration was 0.27mg / L.
[0070] Step 2: Determine the dosing ratio of the agent
[0071] In this example, the repaired soil is backfilled in situ. It is required that the Pb leaching concentration of the repaired soil should not be greater than 0.05 mg / L under simulated acid rain leaching. Combined with the initial Pb leaching concentration data and repair requirements, the empirical method is used to determine the dosage ratio of the agent to be 1.0 %.
[0072] Step 3: Pretre...
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Abstract
The invention provides a lead-contaminated soil remediation agent and an engineering application method of the agent. The medicament is compounded by various substances, and the mass percentage of each component is: 5%-25% of phosphorus-based substance; 5%-15% of magnesium oxide; 45%-85% of cement; 5%-15% of straw powder. The engineering application steps of the remediation agent are: ①soil pollution investigation and evaluation; ②experimental or empirical method to determine the dosage ratio of the agent; ③contaminated soil pretreatment, removing large pieces of construction waste, stones, etc. and crushing soil clods; ④use Screening buckets, excavators or tillers, etc. to mix medicine and soil; ⑤Adjust the moisture content to 25%-35%; ⑥Cover and maintain for 3-7d; ⑦Remediation effect evaluation; ⑧Final disposal of standard soil. The restoration medicament of the invention has wide sources of raw materials, is environmentally friendly, easy to control the quality, low in cost, good in restoration effect, and has a simple operation process and convenient implementation of the engineering application method. The invention provides a high-efficiency, green and low-cost medicament and its application method for the restoration and treatment of Pb-contaminated soil.
Description
technical field [0001] The invention relates to a lead-contaminated soil remediation agent and an engineering application method of the agent, and belongs to the technical field of lead-contaminated soil remediation agents and engineering application methods. Background technique [0002] As a toxic and harmful heavy metal, Pb is harmful to almost all organs of the human body, especially the nervous system of the human body. Pb-contaminated soils are widely distributed in my country. Soils in lead-zinc mines, lead-zinc smelting plants, lead-acid battery production enterprises, and Pb-containing paint production enterprises will all be polluted by Pb. Before the site is redeveloped and utilized, the soil must be polluted. Restoration and treatment to reduce human health risks. For the remediation of Pb-contaminated soil, commonly used technologies include solidification / stabilization (S / S) technology, soil leaching technology, physical barrier technology, ectopic safe landfil...
Claims
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Application Information
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