Q. Consider the following pairs related to the different techniques:
1. Bio Venting : ex situ method of treating soils contaminated by petroleum hydrocarbons.
2. Bioleaching : use of micro organisms in extraction of metals from their ores.
3. Bio Reactors : ex situ technique of treating groundwater contaminants.
Which of the above given pairs is/are correctly matched?

[A] 1 and 2 only

[B] 2 and 3 only

[C] 1 and 3 only

[D] 1 only

Answer: B

Explanation: Bio-venting is one of the most widely used in situ methods of remediating soils contaminated by petroleum hydrocarbons.

Land farming is an ex situ bio remediation technique used to dispose of oily sludge from petroleum refinery operations.

Composting, Land farming, Bio reactors and Bio piles are ex situ bioremediation techniques where as bio venting is an in situ bioremediation technique.

Bioleaching (or biomining) is a process in mining and biohydrometallurgy (natural processes of interactions between microbes and minerals) that extracts valuable metals from a low-grade ore with the help of microorganisms such as bacteria or archaea.

Source: The Hindu