C.**Biosparging**

Biosparging is basically a biological approach which removes the aromatic compounds contamination like benzene, toluene, ethylbenzene, xylene and neptthalene from an area. This process involves the loading of specific aerobic bacteria to break down the mineral oil and aromatic compounds into simpler and useful form. This technique is similar to bioventing where air is incorporate into soil subsurface to stimulate microbial activities to enhance pollutant removal from polluted sites. In biosparging air is injected at the saturated zone, which can cause upward movement of volatile organic compounds to the unsaturated zone to promote biodegradation [19]. There are two major factors which affect the biosparging process namely:

