Question

Which of the following bioremediation strategies focuses most on the action of microbes to digest or alter the contaminant? Bioventing Biosparging Permeable reactive barrier Bioslurping

Answer 1

Question :- answer to the question is biosparging and Bioventing.

In situ bioremediation :- is the application of a biological treatment to clean up hazardous compounds present in the environment. The optimization and control of microbial transformations of organic contaminants requires the integration of many scientific and engineering disciplines. Some of the in situ bioremediation practices have been discussed below.

Biosparging: This involves the injection of air under pressure below the water table to increase ground water oxygen concentrations and to enhance the rate of biological degradation of contaminants by naturally occurring bacteria. Biosparging increases the mixing in the saturated zone and thereby increases the contact between soil and ground water. The ease and low cost of installing small-diameter air injection points allow considerable flexibility in the design and construction of the system.

Bioventing: Bioventing is a promising new technology that stimulates the natural in situ biodegradation of any aerobically degradable compounds by providing oxygen to the existing soil microorganisms. It uses low air flow rates to provide only enough oxygen to sustain microbial activity. Oxygen is most commonly supplied through direct air injection into residual contamination in soil by means of wells. Henceforth, the adsorbed fuel residuals are biodegraded and volatile compounds are also biodegraded as vapors move slowly through biologically active soil.

Bio-sparging is a technique in which air is injected beneat