tailieunhanh - Chemical Degradation Methods for Wastes and Pollutants - Chapter 9

Thấm qua rào cản phản ứng của kim loại sắt và Zero-Valent "Hiện đại" lịch sử của việc sử dụng các kim loại zero-valent (ZVMs) trong khắc phục hậu quả của nước bị ô nhiễm đã được tổng kết từ những quan điểm một số [1-4]. Hầu hết các tài khoản, sự kiện quan trọng là phát hiện tình cờ trichloroethene (TCE) là suy thoái, sự hiện diện của các vật liệu kim loại vỏ được sử dụng ở một số giám sát nước ngầm giếng [5]. Quan sát này dẫn đến sự công nhận rằng hạt sắt kim loại có. | 9 Permeable Reactive Barriers of Iron and Other Zero-Valent Metals Paul G. Tratnyek Oregon Health and Science University Beaverton Oregon . Michelle M. Scherer University of Iowa Iowa City Iowa . Timothy L. Johnson AMEC Earth Environmental Inc. Portland Oregon . Leah J. Matheson MSE Technology Applications Inc. Butte Montana . I. INTRODUCTION A. Historical Context The modern history of the use of zero-valent metals ZVMs in the remediation of contaminated water has been summarized from several perspectives 1-4 . By most accounts the critical event was the serendipitous discovery that trichloroethene TCE is degraded in the presence of the metal casing materials used in some groundwater monitoring wells 5 . This observation led to recognition that granular iron metal might be applicable to the remediation of groundwater that is contaminated with chlorinated solvents. Around the same time the possibility of engineering permeable treatment zones for in situ treatment of contaminated groundwater had led to a search for suitable reactive media and granular iron quickly became the most promising reactive medium for application in permeable treatment zones 6 . The confluence of these two developments granular iron and permeable treatment zones made the emergence of reactive barriers Copyright 2003 by Marcel Dekker Inc. All Rights Reserved. containing granular iron into one of the landmark developments in the history of groundwater remediation technology. The rapid development of this technology over the last decade has been accompanied by a conspicuous increase in the quantity of published information on the reaction of iron metal with organic and inorganic solutes in aqueous systems. With so much activity in the present it is easy to overlook how much relevant work was done earlier. For example the electrolytic deposition of dissolved metals onto ZVMs has long been known to chemists and the potential for application of this chemistry to water treatment