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Microbial nutrient for repairing chromium-contaminated soil and sediments

A chromium-contaminated soil and sediment technology, applied in the restoration of contaminated soil, microorganisms, microorganisms, etc., can solve the problems of chromium-contaminated soil remediation limitations, lack of nutrients, slow growth of indigenous microorganisms, etc., to reduce mobility and biological Availability, ease of operation, and low-cost effects

Inactive Publication Date: 2015-05-20
SHANDONG ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the lack of nutrients in the environment, the growth of effective indigenous microorganisms is relatively slow, which limits the remediation of chromium-contaminated soils.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The polluted soil selected in this example was taken from the surface polluted soil in a chemical factory area in Jinan City, Shandong Province. The soil was air-dried, ground and passed through a 100-mesh sieve, and stored for future use. After determination, the basic properties of the polluted soil taken in Example 1 are shown in Table 1, wherein the concentration of hexavalent chromium in the polluted soil is 2655.6mg / kg, the total chromium concentration in the leachate is 179.49mg / L, and the hexavalent chromium concentration in the leachate is 119.88 mg / L.

[0017] Soil moisture content % Soil hexavalent chromium concentration (mg / kg) Total chromium concentration in leaching (mg / L) Concentration of hexavalent chromium in leachate (mg / L) 8.27 2655.6 179.49 119.88

[0018] Take 1kg of air-dried chromium-contaminated soil and put it in a 2L plastic bucket, add 150g of microbial nutrition agent composed of molasses and bean cake powder in a ...

Embodiment 2

[0021] In this embodiment, the selected polluted soil type, operation steps and related measurement methods are all the same as in Example 1, the difference is that the mass ratio of bean cake powder and molasses in the added microbial nutrient is 1:9, and the carbon and nitrogen content of the microbial nutrient is 1:9. The ratio is about 36.16:1, and the moisture content is adjusted to 37%. It was determined that the concentration of hexavalent chromium in the repaired soil was 65.43mg / kg, and the removal rate of hexavalent chromium in the soil reached 97.54%; 2007) the concentration of hexavalent chromium in the leach solution prepared was not detected, the concentration of total chromium was 7.33mg / L, and the stabilization efficiency of total chromium was 95.91%.

Embodiment 3

[0023] In this embodiment, the underwater sediments of a foundation pit in a chemical factory area in Jinan City, Shandong Province were selected, air-dried, ground and passed through a 100-mesh sieve, and stored for future use. After measurement, the basic properties of the deposits taken in Example 3 are as shown in Table 2, wherein the concentration of hexavalent chromium in the deposits is 126.09mg / kg, the total chromium concentration in the leach solution is 8.41mg / L, and the concentration of hexavalent chromium in the leach solution is 5.93mg / L.

[0024] Moisture content% Concentration of hexavalent chromium in sediment (mg / kg) Total chromium concentration in leaching (mg / L) Concentration of hexavalent chromium in leachate (mg / L) 4.56 126.09 8.41 5.93

[0025] Take 1 kg of air-dried chromium-contaminated sediment and put it in a 2L plastic bucket, add 20 g of microbial nutrition agent composed of molasses and bean cake powder in a certain rat...

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Abstract

The invention relates to a microbial nutrient for repairing chromium-contaminated soil and sediments. The microbial nutrient is prepared from soybean cake powder and molasses in a certain proportion. The microbial nutrient disclosed by the invention is added to the soil or sediments, so that large-scale growth of indigenous microorganisms in the soil or sediments is promoted; poisonous and movable Cr (VI) in the soil or sediments is reduced into low-toxicity Cr (III) which is not prone to move through the reduction effects of the microorganisms; meanwhile, the microorganisms fix trivalent chromium through processes of adsorption, precipitation and the like, so that the mobility and the bio-availability of the trivalent chromium are reduced, and the trivalent chromium is prevented from being re-oxidized into hexavalent chromium. The microbial nutrient has the advantages of being low in cost, good in effect, easily-available in material, convenient to use, environment-friendly, and the like.

Description

technical field [0001] The invention relates to a microbial nutrient for repairing chromium-polluted soil and deposits, and belongs to the technical field of environmental protection. Background technique [0002] Chromium (Cr) is a common metal pollutant in the natural environment, and it is also one of the top 20 toxic substances prioritized by the US Superfund. Since my country built the first chromium salt production line in 1958, more than 70 enterprises have produced chromium salts, and there are 25 existing ones. According to the statistics of the "Comprehensive Treatment Plan for Chromium Slag Pollution", the cumulative amount of chromium slag produced in my country is about 600 million. million t. Chromium slag contains 0.3-1.5% soluble hexavalent chromium, which is washed by precipitation and surface water and enters the surrounding soil and groundwater, causing serious chromium pollution to the environment. At present, the soil seriously polluted by hexavalent ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/10C12N1/00
Inventor 黄莹徐民民王宁李永霞杨健高甫威孙博
Owner SHANDONG ACAD OF ENVIRONMENTAL SCI
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