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Method for removing phenanthrene in contaminated soil with chemical reinforcing compost

A technology of polluted soil and chemical oxidation, which is applied in the restoration of polluted soil, the preparation of organic fertilizers, organic fertilizers, etc., can solve the problems of no relevant research data, reduce the residual rate, solve the problem of mass transfer limitation, and be easy to operate Effect

Inactive Publication Date: 2008-09-24
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Combining chemical oxidation and composting technology to remove PAHs in soil is an idea to improve the bioavailability of PAHs in soil, but there is no relevant research data at home and abroad on whether this technical solution is feasible and how effective it is.

Method used

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  • Method for removing phenanthrene in contaminated soil with chemical reinforcing compost
  • Method for removing phenanthrene in contaminated soil with chemical reinforcing compost
  • Method for removing phenanthrene in contaminated soil with chemical reinforcing compost

Examples

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Effect test

Embodiment 1

[0021] The soil that present embodiment selects is the top layer (0~5cm) soil that phenanthrene content is 500mg / kg, and quality is 100kg, and organic matter content is 7.73%, above-mentioned soil is processed according to the following steps:

[0022] (1) Chemical oxidation pretreatment: air-dry the above-mentioned phenanthrene-contaminated soil naturally, remove stones and other impurities in the air-dried soil and add sawdust with 10% of the soil mass, and use 0.76kg of ozone to chemically treat the soil after adding sawdust. Oxidation pretreatment, the oxidation pretreatment process is carried out in a columnar reactor with a sieve plate at the bottom, and the treatment time is 100min;

[0023] (2) Composting treatment: select agricultural plant waste, leaves, wood chips and the above-mentioned pretreated soil as compost raw materials with a mass ratio of 3:1:1:8, and air-dry the compost raw materials and crush them until the particle size It is larger than 20mm, and then ...

Embodiment 2

[0027] The soil that embodiment selects is the subsurface layer (5~10cm) soil that phenanthrene content is 500mg / kg, and quality is 100kg, and organic matter content is 3.64%, above-mentioned soil is processed according to the following steps:

[0028] (1) Chemical oxidation pretreatment: air-dry the above-mentioned phenanthrene-contaminated soil naturally, remove stones and other impurities in the air-dried soil and add sawdust with 10% of the soil mass, and use 0.76kg of ozone to chemically treat the soil after adding sawdust. Oxidation pretreatment, the oxidation pretreatment process is carried out in a columnar reactor with a sieve plate at the bottom, and the treatment time is 100min;

[0029] (2) Composting treatment: select agricultural plant waste, leaves, wood chips and the above-mentioned pretreated soil as compost raw materials with a mass ratio of 3:1:1:8, and air-dry the compost raw materials until they are crushed to a particle size of less than It is larger than...

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Abstract

The invention discloses a method for removing phenanthrene contamination from soil by chemical enhanced compost, including the following steps: soil contaminated by phenanthrene is removed with impurities and then is added with an expanding agent, the amount of the expanding agent accounts for 10 to 20 percent of the soil mass after removing the impurities, ozone is used for pretreatment by chemical oxidation to soil added with the expanding agent; the pretreatment lasts for 40min to 100min; and then the agricultural plant wastes, leaves, expanding agent and the soil after pretreatment are selected as compost materials which are air-dried, broken and mixed for compost disposal, the compost time lasts for 25d to 35d. The phenanthrene contamination in the oil can be fundamentally removed after the compost disposal. The method for soil regeneration provided by the invention not only saves the consumption of oxidants, but also solves the problem that mass transfer restriction on restoring soil contaminated by phenanthrene, thereby reducing the residual rate of the phenanthrene. The method is the method for soil regeneration, and is characterized by simple operation, low cost, good effect and short time.

Description

technical field [0001] The invention relates to a chemically enhanced biological environmental protection technology, in particular to a method for regenerating polluted soil by utilizing the chemically enhanced biological environmental protection technology. Background technique [0002] Due to reasons such as incomplete combustion of fuel, polycyclic aromatic hydrocarbons (PAHs) enter the environment. Soil is an important carrier of PAHs in the environment. Due to the extremely low water solubility, PAHs are difficult to be biodegraded in the environment. They are a type of typical persistent organic pollutants, which can cause acute and chronic damage to the human body. Some PAHs have strong teratogenic, carcinogenic and mutagenic effects. Therefore, the control and remediation of PAHs in soil has become an area of ​​great concern. [0003] The remediation methods of polycyclic aromatic hydrocarbons in soil mainly include chemical methods, physical methods and biologica...

Claims

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Application Information

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IPC IPC(8): B09C1/08C05F17/00
CPCY02W30/40
Inventor 牛秋雅曾光明牛一乐杜春艳陈耀宁晏铭邓久华
Owner HUNAN UNIV