Download Bioremediation

present by:
MARINA MOUNIR
2ND LEVEL
supervisor: DINA EL-KISHIN
BIOREMEDIATION
Bioremediation can be defined
as any process that uses
microorganisms, fungi, green
plants or their enzymes to return
the environment altered by
contaminants to its original
condition.
 the branch of biotechnology that uses
biological process to overcome
environmental problems the act of
treating waste or pollutants by the use
of microorganisms (as bacteria) that
can break down the undesirable
substances
Methods Of
Bioremediation
 Bioremediation processes vary in their methods of
remediation. Depending upon the location of the
contamination Bioremediation techniques can either
be applied to the surface and subsurface, or require
above ground remediation. Surface and subsurface
Bioremediation deals with contaminated soil down
to twelve inches below ground level. In this
technique water and nutrients are added, in addition
to tilling the soil, in order to optimize bacterial
growth and begin the bioremediation process.
types Of Bioremediation
There are two main types of
bioremediation.
 In-Situ Remediation
In-situ Bioremediation treats the contaminated soil or
groundwater in the location in which it is found. In
this technology oxygen and occasionally nutrients
are pumped under pressure into the soil through
wells. The nutrients are spread on the surface to
infiltrate into the contaminated area of material or
the saturated zone Remediation.
 Ex-Situ Remediation
Ex-situ Bioremediation requires pumping of
the groundwater or excavation of
contaminated soil prior to remediation
treatments. Ex-situ Bioremediation can be
further broken down into two main
components or processes; Slurry-phase
and solid-phase treatment.
 Slurry-phase bioremediation. Contaminated
soil is combined with water and other additives in a
large tank called a "bioreactor" and mixed to keep
the microorganisms -- which are already present in
the soil -- in contact with the contaminants in the
soil. Nutrients and oxygen are added, and conditions
in the bioreactor are controlled to create the
optimum environment for the microorganisms to
degrade the contaminants.
 Solid-phase bioremediation. Solid-phase
bioremediation is a process that treats soils in aboveground treatment areas equipped with collection
systems to prevent any contaminant from escaping
the treatment. Moisture, heat, nutrients, or oxygen
are controlled to enhance biodegradation for the
application of this treatment.
Effects On Society
Bioremediation is a fairly new technique within the
past ten years that has yielded both remarkable and
yet some setback results.
 As to advantages, bioremediation is a “natural
process”, it destroys the target chemicals, its’ usually
less expensive than other technologies, and can be
used where the problem is located.
 Disadvantages of bioremediation include the fact
that little is still known concerning specifics on its
effects in areas having multiple contaminations, it
often takes longer than other treatment methods,
and that it requires constant monitoring to ensure
effectiveness.
Thank you