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recovered ground water is pumped into the In air strinping�nd flows downward by gravity through a .._. top of a column ward packing material or series of traficients. rair-water cois forced ntact through the column► Providing percent of dissolved -- to typically remove from 90 to over 99 p at the oileate BTEX constituecol Tandtisadischargedor water rcfurther dtreated? bottom of the co ed at the top of the tower may if required. Air dint prior to discharge to the atmosphere also require treatment P regulations. The San Joaquin depending on air quality g County Air Pollution control inti�mum fe90 percentZene emissions to De reduced by regardless of the influent concentrations tuentr stripping is typically used when by h for economical concentrations or pum?ing rates are too hi9 applicable to this site due to the use of activated carbon treatment of water Air stripping was determined not to be app round water. high ratio of TPH--D constituents in the 9 tion is a long proven technology for Activated carbon adsorption water. The technology is removal or organic comp ani_c constituents iple that certain org Activated carbon based on the princ preferentially adsorb to organic carbon- from systems are capable of v ry low concentrationsndissolved nofsBTEX and ground water including y most other gasoline and diesel constituents. application of carbon adsorption is Passing The most common app product/water two or three separate carbon ground water under oressiire through a illed separator followed byists ister f treatment units- Each unit tcons carbonoinathenfirst canister `y with activated carbo then returned is exhausted it is replaced or recharged, onstream as the downstream unit. This ensures that a second contact stage remains online to protect against discharge of hydrocarbon constituents asExpended carbonis osted to a suitable recycling facility- The approaches exhaustion or breakthrough- the carbon normally transp ed during adsorbed hydrocarboration process. recycling or regeneration p A major cost of the carbon adsorption system of the Of spent carbon- Cost of fres}'disposal disposal or recycling pound, but with the cost of carbon is about $1 Per or recycling, the total cost far carbon is about $3.50 per pound. Due to theseoneentrations oft dissolvedhod is -phase for treatment of highe hydrocarbons in ground water.