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Deep degradation method of soil high concentration chlorinated nitrobenzene pollution using mixed surfactant solubilization and Fenton oxidation

A technology for chloronitrobenzenes and surfactants, applied in the field of soil pollution treatment, can solve problems such as high cost and unsatisfactory effect, and achieve the effects of convenient operation, easy large-scale production and use, and simple and easy method.

Active Publication Date: 2015-08-26
SHANGHAI ACADEMY OF ENVIRONMENTAL SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • 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 Aqueous solution: Tween-80 aqueous solution=1:0.8 ratio mixing two kinds of surfactant solutions. Take by weighing 1.8Kg the polluted soil of actual chlorinated nitrobenzene class pollution site in a certain place and put it into the reaction container (that is, the mixed surfactant solution consumption is 2L / Kg soil), mix the soil and the surfactant solution by stirring, and react after 3 days, The reaction suspension was left to stand, and the upper layer 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 p...

Embodiment 2

[0022] Prepare 3L of sodium dodecylbenzenesulfonate aqueous solution with a concentration of 10g / L, prepare 3L of Tween-80 aqueous solution with a concentration of 10g / L, and put it in a 10L glass reaction vessel according to the volume ratio : Tween-80 aqueous solution=1:1 ratio mixing two kinds of surfactant solutions. Take 2Kg of the actual chloronitrobenzene polluted site polluted soil in a certain place and put it into the reaction container (that is, the mixed surfactant solution consumption is 3L / Kg soil), mix the soil and the surfactant solution by stirring, react after 4 days, 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 the rea...

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 Aqueous solution: Tween-80 aqueous solution = 1:1.2 ratio mixing two surfactant solutions. Take by weighing 2.2Kg the actual chlorinated nitrobenzene class polluted site polluted soil in a certain place and put it into the reaction container (that is, the mixed surfactant solution consumption is 4L / Kg soil), mix the soil and the surfactant solution by stirring, after reacting for 5 days, The reaction suspension was left standing, and the upper aqueous solution was discharged after the soil particles completely sank to the bottom layer. The removal rate of soil chloronitrobenzene pollutants was 76.4%. Prolonging the reaction time to 7 days has a limited improvement (<5%) in the removal rate of pollutan...

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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, effects and harms of soil pollution [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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Patent Type & Authority Patents(China)
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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