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Permeable reactive barrier
A permeable reactive barrier (PRB), also referred to as a permeable reactive treatment zone (PRTZ), is a developing technology that has been recognized as being a cost-effective technology for ''in situ'' (at the site) groundwater remediation. PRBs are barriers which allow some—but not all—materials to pass through. One definition for PRBs is an ''in situ'' treatment zone that passively captures a plume of contaminants and removes or breaks down the contaminants, releasing uncontaminated water.〔Gillham, R.; Vogan, J.; Gui, L.; Duchene M.; Son J. (2010). Iron barrier walls for chlorinated solvent remediation. In: Stroo, H. F.; Ward, C. H. (eds.), ''In Situ'' Remediation of Chlorinated Solvent Plumes. Springer Science+Business Media, New York, NY, p. 537. 〕 The primary removal methods include: (1) sorption and precipitation, (2) chemical reaction, and (3) reactions involving biological mechanisms.〔Tratnyek, P. G.; M. M. Scherer; T. J. Johnson; Matheson, L.J. (2003). Permeable reactive barriers of iron and other zero-valent metals. In: Tarr M. A. (ed.), Chemical Degradation Methods for Wastes and Pollutants; Environmental and Industrial Applications. Environmental Science and Pollution Control, Marcel Dekker, New York, pp 371-421. 〕
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