In situ Groundwater Remediation Using Treatment Walls

Abstract

Development of treatment wall technology for the clean up of contaminated ground-water resources has expanded in the past few years. The main perceived advantage of this technology over ex situ and other in situ ground-water remediation approaches is reduced operation and maintenance costs. Since the first commercial application of zero-valent iron using a funnel-and-gate system for the removal of chlorinated hydrocarbons in February, 1995, several field-and pilot-scale studies are evaluating the feasibility of this technology for treatment of both organic and inorganic contaminants.Although, considerable design details have already been developed through fieldand pilot-scale applications of this technology, some critical issues (e.g., establishing tested and proven design procedures, improving construction technologies, documenting long-term performance, and evaluating synergy with other ground-water remediation technologies) still remain to be resolved. Currently planned field-scale tests and many ongoing laboratory studies are designed to address these issues and facilitate wider implementation of this technology.

Permeable reactive barrier for groundwater remediation

“…Remediation of pollutants using microorganisms (bioremediation) is one of the promising and viable technologies, which Not effective on all types of organic compounds especially certain dense non-aqueous phase liquid compounds like 1,2-dichloroethane and dichloromethane [54] Ability to be used in different states: as a pile [24,90], powder/granular [62], filing [91], colloidal [58,59], nanosized [61,62], emulsion that can be injected [63] Lifetime of the material could be reduced due to the formation of surface coating due to geological condition of the site [93] High reactivity with organic and inorganic contaminants [92] Increase in pH during reaction induces corrosion and subsequent precipitation of minerals would lead to decreased permeability of reactive material [94] Ability to combine with other treatment methods, e.g. bioremediation H 2 gas produced and the microorganism (biofouling) could reduce the porosity of reactive material Less or no major problems associated with occupational health and safety (OHS) in handling this material Limited information available on long term performance of the system especially on the build-up of surface precipitates and biofouling.…”

Treatment of chlorinated organic contaminants with nanoscale bimetallic particles

“…In laboratory studies many other metals, particularly zinc and tin, can also reduce chlorinated compounds [9,10]. Many challenges still exist for implementation of the zero-valent metal technology [11]:…”

In situ groundwater MOP-UP. Topical report, April 12, 1996--May 11, 1998

“…The emerging reactive barrier technologies and their current commercial status 13 are summarized in Figure 30. The technologies that are targeted at heavy metals and/or radionuclides include various types of sorbents (peat, ferric oxyhydroxide, bentonite, zeolites and modified zeolites, and chitosan beads) and precipitating reagents (hydroxyapatite, zero-valent iron, dithionite, and 1imeDimestone.)…”