Question

Give two circumstances in which in situ treatment would be better, and two in which ex situ treatment would be better. Both using chemical oxidation as the remediation technique.

Answer 1

Answer:

in situ treatment would be better if; (1) a large volume of soil is to be treated at once, and (2) a permeable sandy soil (un-compacted) is to be treated.

ex situ treatment would be better would be better if; (1) a wider range of contaminants and soil types are to be treated, and (2) there is more certainty about the uniformity of treatment because of the ability to homogenize, screen, and continuously mix the soil.

Explanation:

in situ treatment would be better if;

• a large volume of soil is to be treated at once
• a permeable sandy soil (un-compacted) is to be treated

ex situ treatment would be better would be better if;

• a wider range of contaminants and soil types are to be treated
• there is more certainty about the uniformity of treatment because of the ability to homogenize, screen, and continuously mix the soil.