Method for enhancing restoration of soil nitrobenzene contamination by anion-nonionic surfactant

A surfactant and soil restoration technology, which is applied in the field of soil organic pollution restoration, can solve the problems of unseen application reports of anion-nonionic mixed surfactants, secondary pollution, etc., and achieve easy large-scale promotion and low cost Effect

Inactive Publication Date: 2008-05-21
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] After searching the prior art documents, it was found that Chinese Patent Publication No. CN1570021A, patent name "Surfactant Enhanced Adsorption and Fixation Restoration Method for Organic Pollution of Soil", this patent mentions that cationic surfactants are used to adsorb and fix organic pollutants before use Non-ionic surfactants can be used for elution repair, but because cationic surfactants can strongly adsorb on soil particles, it is easy to cause secondary pollution when used in soil repair, and according to Dong Wenjuan, Zhao Baowei, etc. No. 2 of 2010) an article entitled "Solubilization of DNAPLs by anionic-non-mixed surfactants" reported that the solubilization and repair efficiency of anionic-nonionic mixed surfactants for organic matter is much higher than that of single nonionic surfactants Solubilization and remediation efficiency, but there is no relevant report on the technical elements such as the optimal ratio, effective concentration, and usage amount of mixed surfactants to actually remediate soil pollution, and there is no anion-nonionic mixed surfactants in soil. Application report on synergistic remediation of nitrobenzene pollution

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  • Method for enhancing restoration of soil nitrobenzene contamination by anion-nonionic surfactant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] First, mix SDS and Tween80 at molar ratios of 1:0, 4:1, 3:2, 1:1, 2:3, 1:4, and 0:1, and prepare total concentrations of 0.5, 1.0, and 1.5 mmol, respectively. / L of mixed surfactant solution. Contaminate soil samples with methanol solution of nitrobenzene, the pollution amount is 10g nitrobenzene / kg soil, stir evenly, place in dark place to let methanol volatilize naturally, and prepare nitrobenzene contaminated soil samples. Spread a layer of quartz sand at the bottom of a plexiglass column with a diameter of 3cm, then weigh 100g of the contaminated soil sample and put it into the column, compact it, and then spread a layer of quartz sand evenly, and then use a mixed surfactant solution from top to bottom Rinse, the eluate is collected once per 100mL, and ends after collecting 40 groups.

[0019] Pipette the supernatant, centrifuge at 25±1°C and 4000 rpm for 10 min, measure the concentration of nitrobenzene in the eluate at 267.5 nm with a UV spectrophotometer, and ca...

Embodiment 2

[0022] First, SDS and Tween80 were mixed at a molar ratio of 3:2 to prepare mixed surfactant solutions with total concentrations of 1.0, 2.0, 3.0, and 4.0 mmol / L. Contaminate soil samples with methanol solution of nitrobenzene, the pollution amount is 10g nitrobenzene / kg soil, stir evenly, place in dark place to let methanol volatilize naturally, and prepare nitrobenzene contaminated soil samples. Spread a layer of quartz sand at the bottom of a plexiglass column with a diameter of 3 cm, then weigh 100 g of the contaminated soil sample and put it into the column, compact it, and then spread a layer of quartz sand evenly, and then spray it with a surfactant solution from top to bottom Washing, the eluate is collected once per 100mL, and ends after collecting 40 groups.

[0023] Pipette the supernatant, centrifuge at 25±1°C and 4000 rpm for 10 min, measure the concentration of nitrobenzene in the eluate at 267.5 nm with a UV spectrophotometer, and calculate the cumulative elutio...

Embodiment 3

[0026] Prepare a mixed solution of SDS-Tween80 with a total concentration of 5.0 mmol / L and a molar ratio of 3:2. Contaminate soil samples with methanol solution of nitrobenzene, the pollution amount is 10g nitrobenzene / kg soil, stir evenly, place in dark place to let methanol volatilize naturally, and prepare nitrobenzene contaminated soil samples. Spread a layer of quartz sand at the bottom of a plexiglass column with a diameter of 3 cm, then weigh 100 g of the contaminated soil sample and put it into the column, compact it, and then spread a layer of quartz sand evenly, and then spray it with a surfactant solution from top to bottom After washing, the eluate was collected every 100 mL, and the experiment ended after 40 groups were collected.

[0027] Pipette the supernatant, centrifuge at 25±1°C and 4,000rpm for 10min, measure the concentration of nitrobenzene in the eluate at 267.5nm with a UV spectrophotometer, and calculate the cumulative elution volume and elution rate....

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Abstract

The invention discloses a remediation method for soil nitrobenzene contamination with anionic-nonionic mixed surfactants synergism, pertaining to agricultural technical field. The steps of the invention are that: firstly, anionic surfactant, lauryl sodium sulfate and nonionic surfactant, poly-oxyethylenesorbitan monooleate are mixed and prepared into anionic-nonionic mixed surfactants solution; secondly, the obtained anionic-nonionic mixed surfactants solution is injected into nitrobenzene contaminated soil through a pump, and nitrobenzene in soil is solubilized and eluted by the anionic-nonionic mixed surfactants solution; thirdly, mixed surfactants eluent injected into nitrobenzene contaminated soil is drawn out through a pump, and anaerobic bio-decomposed via nitrobenzene decomposition bacteria to remove the nitrobenzene, thus purifying soil contamination caused by nitrobenzene. The eluting rate of the invention is as high as 90.7%, and the domestic sewage and industrial wastewater containing surfactants can be secondarily utilized at the same time.

Description

technical field [0001] The invention relates to a method for remediating soil organic pollution in the field of agricultural technology, in particular to a method for synergistically remediating soil nitrobenzene pollution with an anion-nonionic mixed surfactant. Background technique [0002] With the progress of urbanization and industrialization, soil pollution is becoming more and more serious. Hydrophobic organic matter is a common type of pollutant in soil. Because it is easy to be adsorbed or trapped in the soil environment, and its solubility in water is very low, it is difficult to flow with water, but it is slowly desorbed or slightly dissolved in water. It has brought difficulties to the treatment of organically polluted soil. Most of these organic pollutants have "three effects", and after entering the soil, they will migrate in the soil-crop system, causing soil pollution, fertility decline, and endangering the safety of agricultural products, which in turn brin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/08C09K17/14A62D3/02
Inventor 张又弛何明
Owner SHANGHAI JIAO TONG UNIV
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