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Treatment~ trations. It also is used widely in in <br /> Building GranulatedActiv control of air pollution and odors. It i <br /> Clean Water history of use as a treatment for municil <br /> trial, and hazardous wastes, and is comn <br /> ►rftll in home water purification'. <br /> ►alt <br /> .: Recirculating <br /> Well Techr <br /> - Description r� t <br /> ion <br /> 0 <br /> ft <br /> he <br /> Technology <br /> olo <br /> D �Y <br /> 77 <br /> .. _ <br /> Recirculating we technology <br /> is <br /> .. :. . . .. . .. volatile or <br /> vela ed method of treating <br /> .. _ de g � <br /> .Y ... P <br /> :...-.. :�.; .:. :: .... .. is <br /> water. The <br /> .....-.. .�: (VOCs) in ound <br /> pounds <br /> P <br /> ..: ... �..�� . - ferenc <br /> e between Rw <br /> T and ETR <br /> technol <br /> recirculating wens <br /> return treated water t, <br /> well,thus minimizing impacts on the wab <br /> PUMP <br /> ............. <br /> S:.. <br /> Well <br /> Screen sem" - In the re <br /> circulatin well systems being <br /> at the MMR, groundwater is drawn int <br /> near the bottom or from a selected speci <br /> � vac <br /> Contaminated :c i <br /> the groundwater. It comes nto conta+ <br /> water <br /> �Treated Water <br /> :.- which is injected into the well, causing tl <br /> transfer from the water to the air. <br /> The cleaned water then is pumped back <br /> Design Considerations <br /> well into another zone of groundwater. <br /> ETR groundwater collection systems usually consist nation of contaminated groundwater e <br /> of a line or arc of wells placed around the contaml- well from one zone of the aquifer <br /> hated area or in the path of the groundwater flow. groundwater leaving the well in an{ <br /> Reinjection wells are generally placed beyond or creates a zone of recirculation in the g <br /> � <br /> near the edges of the plume. The specific arrange- near the well. Contaminated water mov <br /> mens of extraction and reinjection wells is deter- the zone of recirculation is captured <br /> mined using groundwater flow information and within the well. <br /> tools like computer modeling. Modeling and other <br /> The air containing the VOCs is carried <br /> f tools enable engineers to design the most effective <br /> system, including the number of wells, depths, <br /> to the surface, where it may be piped to ; <br /> or reinjection rates. A treat- carbon treatment system. Activated c., <br /> spacing, and pumping p g <br /> 'v e ment removes contaminants from air ju! <br /> ment plant housing the granular acts at d carbon <br /> located from the extraction and rein- <br /> Depending <br /> water, as described in the ETR set <br /> can be away <br /> Monitoring wells are used to check Depending on the design of the system. <br /> jection wells g <br /> the effectiveness of the treatment system. <br /> air is either released to the surrounding <br /> or directed back into the well for additio <br /> Use at Other Locations of contaminants. The air stream is moni <br /> • and after carbon treatment to ensue <br /> ETR is the most commonly used treatment technol- movol f V <br /> re o o OCs. <br /> ogy for contaminated aquifers. It has been proven <br /> effective over a wide range of site conditions and Design of the System <br /> contaminants for hydraulic control of groundwater <br /> The design of a recirculation well syst, <br /> plumes. <br /> . . mined by the volume of groundwater t <br /> Me -Activated carbon, an important component of ETR treated, the concentration of contan <br /> technology, is used widely in the treatment of thickness of the plume, the pumping ra <br /> organic groundwater contamination. It is an effec- ageg roundwater flow velocity, and the <br /> tiand reliable means of removing organicin-the aquifer. The dimensions of the z <br /> contaminants and is suitable for treating a wide culation determine the number of recircl <br /> r <br /> range of organics over a broad range of concen- <br />