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PAH-Heavy Metal Contaminated Soil Remediation Method

A technology for polycyclic aromatic hydrocarbons and polluted soil, applied in the field of environmental engineering, can solve the problems of complexity, less research, complex pollution effect and mechanism.

Active Publication Date: 2020-05-19
浙江省环境工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with single pollution, compound pollution is obviously more complicated, and various interactions will occur between pollutants, which are expressed as synergy, antagonism and additive effects; these interactions will complicate the pollution effect and mechanism, thus Increase the difficulty of research
[0004] At present, there are still few studies on the soil remediation process and mechanism under the condition of heavy metal-organic compound pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Take the soil 0-1.5m below the stratum in the uncontaminated area, air-dry it naturally after removing debris, mash it into powder, and pass it through a 60-mesh sieve for later use. Take 1.0kg of soil and a certain volume of Cu(NO 3 ) 2 -Cd(N0 3 ) 2 The solution was mixed, stirred fully, air-dried naturally, passed through a 60-mesh sieve, and moved to a brown airtight container to stand for aging for a week to obtain Cu / Cd composite polluted soil; then, pour methanol with a certain amount of phenanthrene dissolved in the Cu / Cd composite polluted soil , stir evenly, air-dry in a fume hood, pass through a 60-mesh sieve, and move to a brown airtight container to stand for aging for a week to obtain Cu / Cd-phenanthrene composite polluted soil, in which the concentrations of Cu and Cd are 500 mg / kg, and the concentration of phenanthrene is 500 mg / kg. 100mg / kg.

[0028] Take the soil 0-1.5m below the stratum in the uncontaminated area, air-dry it naturally after removing...

Embodiment 2

[0034]Contaminated soil near a smelter (2549mg / kg Pb, 26mg / kg Cd, 973mg / kg Zn, 45mg / kg phenanthrene). Install the rinsing pipeline system on the ground surface, the upper edge of the pipeline is equal to the ground surface, and the volume ratio is 3:1 5000ml / L N-lauroyl ED3A solution and 200mg / L chitosan solution are compounded through the control of the solenoid valve The leaching agent enters the contaminated soil through the micropores on the rinsing pipeline system under the action of the booster pump. The leaching time is about 24 hours, and the water-to-soil ratio is about 30:1; Vacuum suction pump extraction collection.

[0035] According to the weight ratio of chitosan, sodium lignin sulfonate, iron oxide and activated carbon is 2: 2: 6: 3 to prepare soil in-situ remediation agent, apply 1.5cm of soil in-situ remediation agent on the soil surface after leaching; Mix the leached soil 25cm thick from the surface with the applied soil in-situ remediation agent by plowing...

Embodiment 3

[0038] The soil in a sewage irrigation area contained 86.8mg / kg Cu, 174.9mg / kg Zn, 3.52mg / kg Cd, 94.5mg / kg Cr, 15mg / kg anthracene, and 9mg / kg phenanthrene. Install the rinsing pipeline system on the surface, and the upper edge of the pipeline is equal to the surface, and the 7000ml / L N-dodecanoyl ED3A solution and the 260mg / L chitosan solution with a volume ratio of 4:1 are compounded by a solenoid valve Under the action of the pressurized pump, the eluent enters the contaminated soil through the micropores on the leaching pipeline system. The leaching time is about 24 hours, and the water-to-soil ratio is about 10:1. Vacuum suction pump extraction collection.

[0039] According to the weight ratio of chitosan, sodium lignosulfonate, iron oxide and activated carbon is 1: 2: 6: 2 to prepare soil in-situ remediation agent, apply 1.0cm of soil in-situ remediation agent on the soil surface after leaching; Mix the washed soil 20cm thick from the surface with the applied soil in-si...

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PUM

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Abstract

The invention relates to a restoration method of polycyclic aromatic hydrocarbon-heavy metal polluted soil. According to the soil dry weight, an eluting agent is added to the polycyclic aromatic hydrocarbon-heavy metal polluted soil for eluting the polycyclic aromatic hydrocarbon-heavy metal polluted soil for 12-24h according to a weight ratio of the eluting agent to the polycyclic aromatic hydrocarbon-heavy metal polluted soil being 10:1 to 30:1; the eluting agent consists of 5000-8000mg / L N-dodecanoyl ED3A solution and 200-300mg / L chitosan solution. By adopting and compounding the chitosan solution and the N-dodecanoyl ED3A solution for forming the eluting agent, the elution rates of heavy metal and organic matters in the polycyclic aromatic hydrocarbon-heavy metal polluted soil are raised significantly, and the antagonism on the elution of the organic matters due to the heavy metal when N-dodecanoyl ED3A is used to elute the polycyclic aromatic hydrocarbon-heavy metal polluted soil is overcome. In addition, a chelating type surfactant, namely, the N-dodecanoyl ED3A, and the chitosan solution have no toxicity to the environment and are prone to biological degradation.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a polycyclic aromatic hydrocarbon-heavy metal polluted soil restoration method. Background technique [0002] With the rapid development of industrialization and urbanization, the "three wastes" discharged into the environment are increasing day by day, causing serious environmental pollution problems and causing adverse effects. Environmental restoration work is urgently needed. Among them, soil pollution presents the characteristics of multi-source, complex, large quantity, wide area, and strong toxicity, which makes the process of soil environmental restoration projects complex and arduous. [0003] The definition of compound pollution refers to the phenomenon of joint action between two or more environmental pollutants of different nature that exist in the same environmental medium or in the same compartment of the ecosystem. According to the ty...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/02B09C1/00
CPCB09C1/00B09C1/02B09C2101/00
Inventor 林媛媛张小莎俞阜东
Owner 浙江省环境工程有限公司