The Minimization Of Wastes Produced
During The Treatment Of Arsenic Contaminated
Drinking Water
Author(s)
P. Sylvester, T. Möller & O. Boyd
Abstract
Arsenic in potable groundwater is a major concern in the United States and many
remediation strategies are being utilized to reduce arsenic levels to below the
Environmental Protection Agency’s maximum contaminant level of 10 µg/L.
The most popular technology is adsorption, where the arsenic species in the
groundwater are adsorbed onto a solid metal oxide phase which is ultimately
disposed of directly into a landfill. Standard adsorptive media are generally not
regenerated due to poor mechanical strength and huge volumes of solid waste are
generated annually, typically with arsenic contents of a few milligrams per gram
of material. These wastes, which usually pass the Environmental Protection
Agency’s (EPA) Toxic Characteristic Leaching Procedure (TCLP), are disposed
of as non-hazardous wastes. Recent research has indicated that the adsorbed
arsenic is mobilized under reducing landfill conditions and can migrate back into
the groundwater supply. Consequently, the current method of disposal of large
volumes of arsenic-bearing wastes may have a major environmental impact in
the future. This paper discusses the advantages of regenerating a more durable
iron-based adsorbent media using a strong caustic solution to strip and
concentrate the arsenic in a small volume of liquid and return the media to
service. The stripped arsenic is then precipitated to generate a much smaller
volume of solid and disposed of as a hazardous waste. This greatly reduces the
total volume of solid waste generated during the arsenic treatment process.
Keywords: arsenic, drinking water, landfill, adsorption, regeneration, solid
waste disposal, TCLP.
Keywords
arsenic, drinking water, landfill, adsorption, regeneration, solid
waste disposal, TCLP.
Related Book
Other papers in this volume
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