Material and method for in-situ remediation of soil and groundwater in organically polluted sites
An organic pollution and in-situ remediation technology, applied in the restoration of contaminated soil, contaminated groundwater/leachate treatment, water pollutants, etc., can solve the problem of low remediation effect
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Embodiment 1
[0021] An in-situ restoration material for organic polluted site soil and groundwater, comprising iron powder, a biosurfactant, and an activator; the preparation method of the restoration material is as follows: firstly, the iron powder is activated by mixing with the activator, and then the iron powder is mixed with the activator The mixture of activators is added to the biosurfactant and stirred to make the iron powder dispersed in the biosurfactant in suspension; the biosurfactant is based on glycolipids, glycosides, cellulose, phytic acid, vegetable oil, saponin Any one or more of dextrin, starch, lignin is mixed with water as a solute, and the solute concentration in the biosurfactant is 0.05g / L-2g / L; the vegetable oil is soybean oil, peanut oil, rapeseed oil oil, castor oil, olive oil; the activator is one or two of the aqueous solution of peroxy salt, hydrogen peroxide, hydrochloric acid, oxalic acid, ethanol, acetic acid, citric acid, lactic acid, and nitric acid; the a...
Embodiment 2
[0024] A method for in-situ remediation of organically polluted site soil and groundwater, comprising the following two steps:
[0025] 1) Application of surfactant in polluted soil: adopt the method of high-pressure rotary spraying, and spray biosurfactant to the bottom of the polluted area in the polluted soil aerated zone (that is, the zone above the water table below the ground) to transfer organic pollutants In the groundwater, the biosurfactant is sprayed by drilling holes at intervals of 1 to 5 meters in the polluted area of the vadose zone. The ratio of the amount of biosurfactant sprayed to the volume of soil in the polluted area is 1-5:1; The diameter of the connected auger bit is 5-15cm, the drill pipe is a hollow liquid injection pipe with a diameter of 3-8cm, and there are high-pressure liquid spray holes around the drill pipe with a diameter of 1.0-6.0mm. The drill pipe is connected with an air compressor and high-pressure liquid pump, the biosurfactant is inje...
Embodiment 3
[0031] This embodiment is an improvement made on the basis of Embodiment 2. For the same part as Embodiment 1 in this embodiment, please refer to the content disclosed in Embodiment 1 for understanding, and the content disclosed in Embodiment 1 should also be used as this embodiment. The content of the example will not be repeated here.
[0032] The soil / groundwater of a certain site is polluted by DDTs. The soil pollution area is 15 square meters, oval in shape, the pollution depth is 2.5-4.8 meters, and the groundwater depth is 3.5 meters. The concentration of DDTs in the soil of the polluted area is 15.85-35.8mg / kg, and the concentration of DDT in the groundwater is 44.8μg / L. The soil quality is mainly silty clay, and the soil permeability coefficient is 5×10 -4 .
[0033] Prepare a 0.25g / L biosurfactant solution, in which the concentration ratio of glycolipids and glycosides is 2:3; adopt the method of high-pressure swirl jetting, 5 swirl jetting wells, the well spacing i...
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