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Pollution-depth degradation method of high-concentration chloronitrobenzene in soil by combination of solubilization and fenton oxidation of mixed surface active agent

A technology of chlorinated nitrobenzenes and surfactants, applied in the field of soil pollution treatment, can solve the problems of high cost and unsatisfactory effect, and achieve the advantages of convenient operation, easy large-scale production and use, and low demand for equipment and energy consumption Effect

Active Publication Date: 2014-03-12
SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the fast Fenton reaction rate, the cost of directly using Fenton reagent to oxidize high-concentration chloronitrobenzene pollution is relatively high, and the effect is not ideal.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020]Prepare 2L of sodium dodecylbenzenesulfonate aqueous solution with a concentration of 8g / L, prepare 1.6L of Tween-80 aqueous solution with a concentration of 8g / L, and put it in a 10L glass reaction vessel according to the volume ratio of sodium dodecylbenzenesulfonate : Tween-80=1:0.8 ratio mix two kinds of surfactant solutions. Weigh 1.8Kg of the actual chlorinated nitrobenzene contaminated soil in a certain place and put it into the reaction container (that is, the amount of mixed surfactant solution is 2L / Kg soil), mix the soil and surfactant solution by stirring, and react for 3 days. The reaction suspension was left standing, and the upper solution was discharged after the soil particles completely sank to the bottom layer. The removal rate of soil chlorinated nitrobenzene pollutants was 68.2%. Prolonging the reaction time to 7 days has a limited improvement (<5%) in the removal rate of pollutants at this stage. Add 5.4L of water (3 times the weight of the soil) i...

Embodiment 2

[0022] Preparation 3L concentration is the sodium dodecylbenzenesulfonate aqueous solution of 10g / L, preparation 3L concentration is the Tween-80 aqueous solution of 10g / L, in 10L glass reaction vessel according to volume ratio sodium dodecylbenzenesulfonate: Mix the two surfactant solutions with Tween-80=1:1 ratio. Weigh 2Kg of the actual chlorinated nitrobenzene polluted site contaminated soil in a certain place and put it into the reaction container (that is, the amount of mixed surfactant solution is 3L / Kg soil), mix the soil and surfactant solution by stirring, react for 4 days, and then statically Place the reaction suspension, and discharge the upper layer solution after the soil particles completely sink to the bottom layer. The removal rate of soil chlorinated nitrobenzene pollutants is 71.3%. Prolonging the reaction time to 7 days has a limited improvement (<5%) in the removal rate of pollutants at this stage. Add 7L of water (3.5 times the weight of the soil) into ...

Embodiment 3

[0024] Prepare 4L of sodium dodecylbenzenesulfonate aqueous solution with a concentration of 12g / L, prepare 4.8L of Tween-80 aqueous solution with a concentration of 12g / L, and place it in a 15L glass reaction vessel according to the volume ratio of sodium dodecylbenzenesulfonate : Tween-80=1:1.2 ratio mix two kinds of surfactant solutions. Weigh 2.2Kg of the actual chlorinated nitrobenzene contaminated site polluted soil in a certain place and put it into the reaction container (that is, the amount of mixed surfactant solution is 4L / Kg soil), mix the soil and surfactant solution by stirring, and react for 5 days. The reaction suspension was left to stand, and the upper aqueous solution was discharged after the soil particles completely sank to the bottom layer. The removal rate of soil chlorinated nitrobenzene pollutants was 76.4%. Prolonging the reaction time to 7 days has a limited improvement (<5%) in the removal rate of pollutants at this stage. Add 8.8L of water (4 time...

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Abstract

The invention discloses a pollution-depth degradation method of high-concentration chloronitrobenzene in soil by combination of solubilization and fenton oxidation of a mixed surface active agent. The pollution-depth degradation method comprises the following steps: preparing and mixing aqueous solution of sodium dodecyl benzene sulfonate of an anionic surface active agent with certain concentration and a non-ionic surface active agent Tween -80 aqueous solution, putting polluted soil into the solution of the mixed surface active agent, and separating and discharging the solution of the mixed surface active agent after full contact reaction; adding a certain amount of water into the polluted soil after solubilizing treatment, mixing uniformly to prepare soil turbid liquid, and adjusting the pH value of the soil turbid liquid to be acid; adding ferrous sulfate for complete dissolving, then adding hydrogen peroxide slowly for stirring reaction, and after the reaction is finished, standing and discharging the upper-layer aqueous solution after the soil particles are completely sunk to the bottom layer. With the adoption of the surface active agent for solubilization, the pollution-depth degradation method disclosed by the invention has the advantages that high-concentration organic pollution can be economically removed, and the pollutant removing effect can be further optimized by the subsequent fenton oxidation. The pollution-depth degradation method is simple and easy and is suitable for large-scale production and use.

Description

Technical field: [0001] The invention belongs to the technical field of soil pollution treatment, and in particular relates to a soil chlorinated nitrobenzene pollution degradation method combined with mixed surfactant solubilization and Fenton oxidation. Background technique: [0002] Soil pollution is one of the pollution problems of the three major environmental elements (atmosphere, water, and soil) in the world. The impact and harm caused by soil pollution to the environment and human beings is that it can lead to changes in the composition, structure and function of the soil, thereby affecting the normal growth and development of plants, causing harmful substances to accumulate in plants, and can enter the human body through the food chain, causing harm to the human body. Human Health (Han Suqing, Chi Xiang. Types of Soil Pollution, Effects and Harm [J]. Friends of Chemical Industry, 2007, 05:32-34). [0003] As a large category of common soil pollution, soil organic ...

Claims

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Application Information

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IPC IPC(8): B09C1/08
Inventor 喻恺李青青朱杰王旌李忠元朱江罗启仕杨洁
Owner SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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