|Consider the following statements.|
|1. Bioventing involves supplying air and nutrients through wells to contaminated soil to stimulate the indigenous bacteria.|
|2. Biosparging involves the injection of air under pressure below the water table to increase groundwater oxygen concentrations and enhances the rate of biological degradation of contaminants.|
|3. Bioaugmentation involves the extraction of specific metals from their ores through the use of living organisms.|
|Which of the statements given above are correct?|
A) 1 and 3
B) 2 and 3
C) 1 and 2
D) All of these
Correct Answer: C
Solution :[c] Bioventing is an in soil remediation technology that uses indigenous microorganisms to biodegrade organic constituents absorbed to "soil in unsaturated zone. Bioventing provides oxygen to stimulate naturally occurring soil microorganism to degrade compounds in soil. Biosparging involves injecting a gas (usually air) under pressure into the saturated zone to provide oxygen to facilitate microbial degradation of contaminants in groundwater and saturated soil. Bioaugmentation is the introduction of a group of natural microbial strains to treat contaminated soil or water.
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