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
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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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