Soil heavy mental eluant, preparation method, application method and waste liquid treatment method

A technology of heavy metals and leaching agents, applied in the field of soil treatment, can solve the problems of mutual consumption, complex use process, easy to cause pollution, and limit practical application, so as to achieve no secondary pollution, good washing effect, and increased practicability Effect

Inactive Publication Date: 2017-08-18
YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Although the existing soil leaching agents have certain effects, there is no leaching agent that meets the above-mentioned 5 conditions at the same time in China, which greatly limits the application of leaching technology
The main problem of EDTA is that it is difficult to decompose in the environment, it is easy to cause pollution, and the price is high; inorganic acids and inorganic salts (FeCl 3 The main problem of ) is that they or their transformed products are highly acidic, which will destroy the productivity and ecological functions of the soil; the oxidants and reductants will be consumed by the rich organic matter and iron and manganese oxides in the soil before they act on the target heavy metals. A large increase in cost will also cause damage to microorganisms in the soil; organic acids are easily neutralized and adsorbed by minerals in the soil, and require a large dose to be effective, and the cost is high; In addition to the disadvantages, there are also problems such as mutual consumption between components and complex use processes, and practical application is also difficult.
The existing domestic soil leaching agent technology rarely mentions how to recover and treat heavy metals in the leaching waste liquid, missing the most important part of the leaching technology, which further limits their practical application

Method used

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  • Soil heavy mental eluant, preparation method, application method and waste liquid treatment method
  • Soil heavy mental eluant, preparation method, application method and waste liquid treatment method
  • Soil heavy mental eluant, preparation method, application method and waste liquid treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A detergent for soil polluted by heavy metals, the active ingredient of which is mainly alkaline soluble humic acid, the specific preparation steps are as follows:

[0030] Step (1), take Xinjiang weathered coal and Shanxi lignite rich in humus, remove sundries, air-dry and grind, pass through a 2-mm sieve for subsequent use;

[0031] In step (2), the material obtained in step (1) is added to 0.1M KOH solution according to the mass volume ratio of 1:20, and the mixed coal slurry is kept under the condition of intermittent vibration for 6 hours to activate and extract humic acid .

[0032] In step (3), the mixture obtained in step (2) is allowed to stand for 2 hours, the extracted humic acid is separated from the solid residue by natural sedimentation, and then the upper humic acid liquid is extracted.

[0033] In step (4), the solid residue of step (3) is mixed with potassium hydroxide solution, and steps (2) and (3) are repeated 5 times in total. Mix the extracts eac...

Embodiment 2

[0040] Washing effect of different leaching agents on heavy metal polluted soil

[0041] The contaminated soil samples came from farmland near a non-ferrous metal smelter in Hunan Province. The heavy metal Cd (6.57mg / kg) in the soil exceeded the standard, while other heavy metals did not exceed the standard, pH=6.16, organic carbon 1.88%. Take an appropriate amount of the soil, air-dry it, grind it finely, and pass it through a 2-mm sieve for later use. Using deionized water as a solvent, dissolve the rinsing agent of the present invention to prepare a rinsing solution, the concentrations are respectively 0.1, 0.3, 0.5, 0.7, 1.0, 2, 4% (mass concentration g / 100mL), and the pH of the solution is adjusted to 6.0 . Mix the heavy metal-contaminated soil and eluent thoroughly in a 15mL centrifuge tube at a solid-to-liquid ratio of 1:5 (g:mL), shake the sample at 3000r min for 12 hours -1 Centrifuge for 25 minutes, take the supernatant and filter it with a 0.45 μm aqueous polyeth...

Embodiment 3

[0044] Determination of washing ability of leaching agent to heavy metals in different soils by batch balance method

[0045] Two contaminated soil samples were obtained from a farmland near a nonferrous metal smelter in Hunan Province and an orchard in Yantai City, Shandong Province, denoted as HN and SD, respectively. The soil properties and heavy metal concentrations of HN and SD are shown in Table 1.

[0046] Table 1

[0047]

[0048] Take an appropriate amount of soil, air-dry it, grind it finely, and pass it through a 2-mm sieve for later use. With deionized water as solvent, rinse agent I of the present invention is dissolved and formulated into 0.05, 0.1, 0.15, 0.2, 0.3, 0.4, 0.5, 0.6, 0.8, 1.0, 1.2, 1.5% (mass concentration g / 100mL) Wash solution, adjust its pH to 6.0. Mix the heavy metal-contaminated soil and washing liquid in a 1:5 (g:mL) well in a 15mL centrifuge tube, shake the sample at 3000r·min after shaking for 12 hours -1 Centrifuge for 15 minutes, tak...

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Abstract

The invention provides a soil heavy mental eluant, a preparation method, an application method and a waste liquid treatment method. The eluant is a humic acid leaching reagent prepared from raw materials such as coal, and is applied to management and remediation of heavy metal contaminated farmlands and industrial and mining sites through a soil washing mode. The soil eluant has the advantages that the heavy metal removal efficiency is high, a new pollutant is not introduced and secondary pollution is not caused. Active humic acid is extracted from the materials such as decomposed coal rich in humic acid as the washing agent for soil heavy metals, the heavy metals in a waste liquid are effectively removed and recovered by using cheap and available quick lime, slaked lime or waste rich in calcium hydroxide, the soil heavy mental eluant has the advantages of being good in washing effect, small in side effect, low in cost and free of secondary pollution, and the practicability of a washing technology is improved.

Description

technical field [0001] The invention belongs to the technical field of soil treatment, and particularly relates to a soil heavy metal leaching agent, a preparation method, a use method and a waste liquid treatment method. The leaching agent is a humic acid leaching agent prepared from coal and other raw materials. It is applied to control and restore heavy metal polluted farmland and industrial and mining sites through soil washing. Background technique [0002] Soil heavy metal pollution has become one of the serious environmental problems in our country, and it has led to food safety problems. The 2014 "National Soil Pollution Survey Bulletin" issued by the Ministry of Environmental Protection and the Ministry of Land and Resources indicated that the overall situation of the national soil environment is not optimistic, the soil pollution in some areas is relatively serious, the soil environmental quality of cultivated land is worrying, and the soil environmental problems o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/02B09C1/08C02F9/04C09K101/00C02F101/20
CPCB09C1/02B09C1/08C02F1/00C02F1/44C02F9/00C02F2101/20C09K17/40C09K2101/00
Inventor 袁国栋孟凡德韦婧毕冬雪王洁王海龙刘兴元林小明
Owner YANTAI INST OF COASTAL ZONE RES CHINESE ACAD OF SCI
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