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Inoculation. C-source. 산화철 피복 모래. Soil contaminated with As. As contamination site. Permeable reactive barrier using iron-oxide coated sand. Groundwater flow. feldspar. Removal of As. As tolerance microbe. As contamination of the groundwater

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Inoculation

C-source

산화철

피복 모래

Soil

contaminated

with As

As contamination site

Permeable reactive barrier

using

iron-oxide coated sand

Groundwater

flow

feldspar

Removal of As

As tolerance microbe

As contamination of the groundwater

(approximately 20 countries in world)

quartz

hematite

U,As,Au

Derived from: www.calacademy.org

AGRG

Arsenic Geochemistry Research Group

Remediation technique

for As contaminated soil

using indigenous bacteria

Permeable reactive barrier

using nanoscale iron particles

in As contaminated subsurface

  • Permeable reactive barrier

  • immobilization of As and

  • heavy metals in the mining areas

  • Keeping the groundwater flow

  • Nanoscale iron particle

  • innovative barrier material

  • High surface area and reactivity

  • Emplacement of nano-particle

  • Emplacement into reactive

  • barrier

  • Finding the optimal condition

  • Biological treatment

  • microbe activity depending on C-source

  • Removal of As by leaching mechanism

  • Source of arsenic

  • Natural source: volcanic action, rock erosion

  • Industrial product: semiconductors, herbicides

Low reactivity, bad permeability, high cost of terrestrial excavation in classic PRB

Contamination of downstream waters, soil, and terrestrial plants

by the release of arsenic and heavy metals

The optimal emplacement condition of nano particles

: technique of deposition and injection of nano particle

Investigation of mobilization of As

by increase of microbial activity depending on supplying C-source

Techniques development to reduce the extensive excavation,

to enhance the reactivity, and to keep the good permeability

Development of remediation technique for As contamination soil

Expected effect Remediation of As/heavy metal-contaminated subsurface around the metal mining areas

Development of Electrokinetic Soil Process

to remediate the Heavy metal in soil

Phyto-remediation/extraction

of toxic elements from soils

Phytoextraction Process

DC power supply

  • A cost-effective remediation technique for large areas with low-level contamination

  • Hyperaccumulators can accumulate elements in the above-ground biomass.

  • Using traditional harvest process to remove toxic elements in the soils

O2

H2

Advantages

  • Effective in non-permeable soils

    such as clayey soils

  • Application to various types of

    contaminants including organic

    and inorganic contaminants &

    radionuclides

  • Minimization of secondary impacts

  • Low operational cost

H2O

H+

OH-

metal

Cathode

Anode

Compacted soil cell

Electrode cell

Electrode cell

Phytoremediation cost effective, large areas, public acceptance,

hydraulic pumping pressure, after closure maintenance, no

excavation, mineralizing organics

Soils are contaminated with heavy metals which migrate and

threaten human health

Soils having low permeability are resistant to in-situ remediation techniques

Investigation

into the mechanisms of hyperaccumulation of As, Au and U

A candidate technology for this type of remedial measure is electokinetic soil flushing

Using plants to extract toxic elements from mining sites

Removal toxic elements

from contaminated sites and recovery of economic elements

Various enhancement techniques have been proposed and used


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MPRG

Metal and PAH Research Group

Biosorption process using bacteria

in metal contaminated groundwater

In-situ immobilization of metals by bacteria

Biosorption mechanism on the surface of bacteria

- entrapment by cellular components

- active transport across the cell memebrane

- cation exchange or complexation

- cell surface adsorption

  • Dissimilatory metal-reducing bacteria (Anaerobe)

  • Metabolism with heavy metals in soil & groundwater

  • Transformation of heavy metals to more stable forms

  • ※ to more immobile forms of heavy metals

  • for in-situ immobilization

Mechanisms of

dissimilatory metal reduction

- Direct (biologic) mechanism

- Indirect (combined biologic-chemical)

mechnism using electron shuttle

Biosorption process in batch system

No excavation of contaminated soil & groundwater

Commercial application for the in low concentrated wastewater

Advantages: highly selective, efficient, easy to operate, cost-effective

Activation or injection of

indigenous metal-reducing bacteria with in-situ

Biosorption characteristics of heavy metals by bacteria

Immobilization technique using bacteria as effective adsorbent

Advantages of cost-effective

and environment-friendly remediation technology

Application to the removal and recovery of heavy metals from

contaminated groundwater in permeable reactive barrier

Remediation process monitoring

for PAH-contaminated soil

using Laser-induced fluorescence(LIF)

Bioremediation of Organic-contaminated Soils Using Biosurfactants

  • Polycyclic Aromatic Hydrocarbons (PAHs)

    • hydrophobic and most are practically insoluble

    • persistence in the environment

    • most exist in strongly adsorbed forms in soils

  • Biosurfactants

  • 1) unique chemical structures

  • (beneficial for remediation)

  • 2) naturally occurring, biodegradable product

  • 3) possible to stimulate in-situ production

  • at the site

  • most aromatic : exhibit high fluorescence

  • quantum yields in uv-light,

  • High selectivity and sensitivity for PAHs

  • overcome the limitation of traditional analytical method

  • quantification using time-resolved analysis

The highly desirable need for real time, in-situ monitoring techniques for PAH-contaminated soils & remediation process

Synthetic surfactant  low bioavailability in biodegradation

process due to toxicity

Development of monitoring techniques for field application based on the LIF spectroscopy showing the high selectivity and sensitivity for PAHs

Biosurfactants  high biodegradation rate due to enhanced solubility and low toxicity

Investigation of the effecting variables on the fluorescence intensity and collection of data concerning calibration method and quantification programm

Development of

the Biosurfactant-Enhanced Bioremediation Technique

Feasibility of biosurfactant-enhanced biodegradation process to remediate the PAHs-contaminated soil

Development of in-situ monitoring technologies as a

quantification/qualification method for the continuous

evaluation for PAHs-contaminated soils