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A method for efficient and synergistic remediation of hydrocarbon-contaminated soil

A technology of contaminated soil and synergistic remediation, applied in the field of organic contaminated soil remediation, can solve the problems of microbial remediation being difficult to maintain a sustained and efficient remediation state, reducing water and electrolyte content, and reducing the efficiency of electric remediation. The effect of improved efficiency and less disturbance of the original soil habitat

Active Publication Date: 2018-10-16
SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Existing research results have shown that the reduction of soil nutrients, especially soluble organic carbon sources and inorganic ions, is one of the key factors affecting microbial biomass and metabolic activity, making it difficult for microbial remediation to maintain a sustained and efficient remediation state; , precipitation, redox conversion, asymmetric migration and other effects lead to the reduction and uneven distribution of water and electrolyte content in the soil, which becomes the main factor for the decrease of current intensity and directly reduces the efficiency of electrokinetic restoration

Method used

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  • A method for efficient and synergistic remediation of hydrocarbon-contaminated soil
  • A method for efficient and synergistic remediation of hydrocarbon-contaminated soil
  • A method for efficient and synergistic remediation of hydrocarbon-contaminated soil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 N-hexadecane contaminated soil remediation

[0036] The polluted soil used in the test is n-hexadecane polluted soil, the soil is sandy loam, the grass root impurities are removed, the room is naturally air-dried and passed through a 2mm sieve, and the n-hexadecane content is 1% (V / W, ml g -1 ) of contaminated soil. Tests were performed after equilibrating for 10 days after configuration. The initial test soil conditions are: soil pH 7.5, soil moisture 23%, soil indigenous microbial content 6.7×10 5 CFU·g -1 , the soil temperature is 21±1°C.

[0037] The test was divided into three treatments, namely microbial restoration (Bio), electrokinetic restoration (EK) and alternate combined restoration of microorganisms and electrokinetics (Bio1+EK1+Bio2+EK2). The test settings and process control are shown in Table 1; Soil electric treatment devices such as figure 1 As shown, the specifications of the soil box are 20cm in length x 15cm in width x 10cm in heig...

Embodiment 2

[0048] Embodiment 2 Pyrene contaminated soil remediation

[0049] The difference from Example 1 is that the soil is pyrene-contaminated soil in aromatic hydrocarbons, and the rest of the operation modes are the same as in Example 1. The initial conditions of the test soil are: soil pH is 7.7, soil moisture is 25%, soil indigenous microbial content is 6.4×10 5 CFU·g -1 , the soil temperature is 23±1°C.

[0050] The specific operation process includes:

[0051] 1). Using 100mg·L pyrene -1 Inorganic salt medium (0.5g / L NaCl, 0.3g / L MgSO 4 , 0.5g / L (NH 4 ) 2 SO 4 , 1.5g / L K 2 HPO 4 , 0.5g / L KH 2 PO 4 , 0.02g / L CaCl 2 , 0.02g / L FeSO 4 , 0.005g / L yeast powder, pH 7.5) at 30°C, 180rpm min -1 The strains capable of degrading long-chain alkanes were enriched and cultured under shaking conditions to obtain high-efficiency degrading bacterial cultures (the strains capable of degrading long-chain alkanes can be Sphingopyxisterrae, Ochrobactrum sp. and Chromobacter sp. (Achr...

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Abstract

The invention relates to the technical field of remediation of organic contaminated soil and particularly relates to a high-efficiency synergetic remediation method for hydrocarbon contaminated soil. According to the method disclosed by the invention, the to-be-remediated hydrocarbon contaminated soil is repeatedly subjected with microbial remediation and electrokinetic remediation which are alternately combined by adopting an alternating remediation treatment mode, so that the remediation process is kept in a high-efficiency rapid remediation state in which pollutants are uniformly degraded, and thus the soil can be remediated. According to the method disclosed by the invention, dissolved organic carbon (DOC) in the coil can be consumed during microbial remediation of the contaminated soil; easily-usable carbon sources are reduced to cause decrement of the microbial remediation efficiency in later period of remediation; soon afterwards, microbial remediation is replaced by electrokinetic remediation; the content of water-soluble transferable ions in the soil is reduced by an electrokinetic effect, so the conductivity is gradually reduced. When the electrokinetic remediation efficiency is weakened, usable carbon sources and electrolyte are replenished; microbial remediation and electrokinetic remediation alternating treatment is repeated; microbial remediation and electrokinetic remediation are effectively combined to realize a high-efficiency treatment stage so as to play an effect of continuously and rapidly degrading organic pollutants in the soil in a manner that the pollutant degradation kinetic curve is linear.

Description

technical field [0001] The invention relates to the technical field of remediation of organic polluted soil, in particular to a method for highly efficient and coordinated remediation of hydrocarbon-contaminated soil. Background technique [0002] Microbial remediation, as an economical and environment-friendly remediation method, relies on the natural metabolic process of microorganisms to degrade organic pollutants in soil, and is regarded as one of the basic remediation technologies. However, the shortcomings of long microbial remediation cycle, short duration of efficient remediation phase, limited scope of remediation pollutants and poor stability of remediation function limit its wide application. As an emerging green restoration method, electrokinetic remediation method can effectively remove organic pollutants in soil under the combined action of electrokinetic effect and electrochemical reaction by inserting electrodes into contaminated soil and applying a low-volta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/10
CPCB09C1/00B09C1/10
Inventor 郭书海王卅李凤梅
Owner SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
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