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Method for eluting PCB138 in soil and degrading PCB138 in soil through potassium persulfate

A technology of PCB138 and potassium persulfate, applied in environmental chemistry technology in the field of environmental protection, can solve the problems of high processing cost and high requirements on reaction conditions, and achieve the effects of environmentally sound treatment, avoiding secondary pollution and simple equipment.

Pending Publication Date: 2021-06-22
LIAONING TECHNICAL UNIVERSITY
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  • Claims
  • Application Information

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Problems solved by technology

Traditional chemical remediation technology has problems such as high requirements on reaction conditions or high treatment costs

Method used

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  • Method for eluting PCB138 in soil and degrading PCB138 in soil through potassium persulfate
  • Method for eluting PCB138 in soil and degrading PCB138 in soil through potassium persulfate

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Embodiment Construction

[0028] (1) Preparation of contaminated soil samples: Collect 0-20 cm surface soil (cultivated land in Changchun City, Jilin Province), remove stones, gravel and plant residues, air-dry them naturally, and pass through a 10-mesh sieve for later use. Grind the spare soil sample through an 80-mesh sieve, add 100mL of n-hexane into a double-necked round bottom flask, then add 7mL of hexachlorobiphenyl PCB138 standard solution, stir evenly, add 50g of soil sample, and stir and disperse for 4 hours with a six-way mixer , placed in a fume hood for more than 24 hours, until the n-hexane is completely volatilized until the soil is dry and ready for use.

[0029] (3) Compound surfactant preparation: use SDS (sodium dodecyl sulfate)-APG06 (n-hexyl glucoside) to prepare anion-nonionic compound surfactant, the concentration ratio is: SDS 7500mg / L, APG06 7000mg / L L.

[0030] (3) Elution of PCB138 in soil: Put 2g of contaminated soil sample into a 100mL Erlenmeyer flask, add 40mL of surfact...

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Abstract

The invention provides a method for eluting PCB138 in soil and degrading PCB138 in soil through potassium persulfate. The process comprises the following steps: (1) preparing a contaminated soil sample; (2) preparing a composite surfactant; (3) eluting the PCB138 in the soil; (4) activating potassium persulfate by adopting copper sulfate / EDTA (Ethylene Diamine Tetraacetic Acid); (5) degrading the PCB138 in the eluent; (6) extracting PCB138 in the soil and the eluent; (7) measuring the PCB138; and (8) calculating the elution rate and the degradation rate of the PCB138. According to the method, an anionic-nonionic composite surfactant is prepared from SDS (lauryl sodium sulfate)-APG06 (n-hexyl glucoside) at normal temperature and pressure, potassium persulfate is activated by copper sulfate / EDTA, and elution and degradation of PCB138 in soil are achieved through the elution effect of the composite surfactant and the degradation effect of an activated potassium persulfate system; and under experimental conditions, the single elution rate of the PCB138 in the soil is 57.7%-58.3%, the degradation rate of the PCB138 in the eluent is 82.0%-83.2%, the pollution of the PCB138 with high chlorine content in the soil is effectively reduced, and the harm of the PCB138 to the ecological environment is reduced.

Description

technical field [0001] The invention belongs to the application of environmental chemical technology in the field of environmental protection. This technology specifically provides a method for preparing composite surfactants using anionic-nonionic surfactants, using copper sulfate / EDTA to activate potassium persulfate and jointly degrading hexachlorobiphenyl PCB138 in soil. Background technique [0002] Polychlorinated biphenyls (PolychloriNated Biphenyls, PCBs) are a class of persistent organic pollutants (POPs) that are widely distributed around the world. The characteristics of bioaccumulation, long-distance migration, obvious biotoxicity and potential carcinogenicity can transfer enrichment through the food chain, thus posing a great threat to organisms and human health. The biphenyl molecules of PCBs can be substituted by 2 to 10 chlorine atoms, and theoretically 209 homologues can be obtained according to the number of chlorine atom substitutions and the substitution...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/08
CPCB09C1/02B09C1/08
Inventor 丛鑫何洋洋王宇李瑶孙思坤
Owner LIAONING TECHNICAL UNIVERSITY
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