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Method for reducing and stabilizing chromium-contaminated soil by chemical-biological coupling

A chromium-contaminated soil and stabilization technology, applied in the restoration of polluted soil and other directions, can solve the problems of difficulty in microbial growth and long remediation time for microbial remediation technology, and achieve improved stabilization effect, reduced mobility and bioavailability , the effect of low price

Inactive Publication Date: 2015-04-08
SHANDONG ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the remediation time of microbial remediation technology is longer, and when the concentration of soil pollution is high, it is difficult for microorganisms to grow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 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. The analysis method of all samples in the embodiment is as follows: according to " soil moisture determination method " (NY / T52-1987 ) Determination of soil moisture content, according to " determination of hexavalent chromium in solid waste Alkali digestion / flame atomic absorption spectrophotometry " (HJ687 -2014) to determine the concentration of hexavalent chromium in soil; prepare the leach solution according to "Solid Waste Leaching Toxic Leaching Method-Sulphuric Nitric Acid Method" (HJ / T 299-2007), and according to "Determination of Hexavalent Chromium in Water Quality, diphenylcarbahydrazide spectroscopic Spectrophotometry" (GB7467-87) was used to determine the concentration of hexavalent chromium in the leach solution, and the...

Embodiment 2

[0030]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 microbial nutrient added in step (2) is 1:4, and the microbial nutrition The carbon to nitrogen ratio of the agent is about 23.5:1. The concentration of hexavalent chromium in the repaired soil is 10.25mg / kg, and the concentration of total chromium in the leaching solution prepared according to "Toxic Leaching Method for Solid Waste Leaching-Sulphuric Nitric Acid Method" (HJ / T 299-2007) is 1.49mg / L , the concentration of hexavalent chromium is 0.13mg / L.

Embodiment 3

[0032] In this embodiment, the selected polluted soil type, operation steps and related determination methods are all the same as in Example 1, the difference is that the mass ratio of bean cake powder and molasses in the microbial nutrient added in step (2) is 1:9, and the microbial nutrition The carbon to nitrogen ratio of the agent is about 36.16:1. The concentration of hexavalent chromium in the repaired soil is 14.86mg / kg, and the concentration of total chromium in the leaching solution prepared according to "Toxic Leaching Method for Solid Waste Leaching-Sulphuric Nitric Acid Method" (HJ / T 299-2007) is 1.15mg / L , the concentration of hexavalent chromium is 0.15mg / L.

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Abstract

The invention relates to a method for reducing and stabilizing chromium-contaminated soil by chemical-biological coupling. The method comprises the following steps: mixing chromium-contaminated soil and ferrous sulfate, uniformly stirring, adding water to control the water content, and maintaining until the concentration of hexavalent chromium in the chromium-contaminated oil is reduced to be lower than 500mg / kg to obtain chemically reduced soil; adding a microbial nutrient prepared from honey and soybean cake powder according to a certain proportion into the chemically reduced soil, uniformly stirring, regulating the water content, and isolating air to maintain for over 30 days to obtain the repaired soil. The method provides a new thought for repairing chromium-contaminated soil, has the advantages of low cost, good effect, small chemical reagent dosage, short repairing time, environmental friendliness, simple operation and the like, and has remarkable economic and environmental benefits.

Description

technical field [0001] The invention relates to a method for chemical-biological coupling reduction and stabilization of chromium-contaminated soil, which 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. The long-term disorderly stacking of chromium slag has caused serious chromium pollution in the surrounding environment, and the treatment of chromium-contaminated soil is urgent. [0003] Chromium exists mainly in two valence states of trivalent chromi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08B09C1/10
Inventor 黄莹徐民民王宁杨健李永霞高甫威孙博
Owner SHANDONG ACAD OF ENVIRONMENTAL SCI
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