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In the first presentation SRP Researcher Joseph Calo, Ph.D., will discuss his team's latest research on developing a spouted vessel/fixed bed filter system for the removal of arsenic from water. The system uses zero-valent iron (ZVI) particles circulating in a spouted vessel that continuously generates active colloidal iron corrosion products. These corrosion products are generated by the "self-polishing" action between ZVI source particles rolling in the moving bed that forms on the conical bottom of the spouted vessel. This action also serves as a "surface renewal" mechanism for the particles and provides for maximum ZVI material utilization. The colloidal material produced in this fashion is continuously captured and concentrated in an internal fixed bed filter where arsenic complexation occurs. This system has been shown to reduce 100 µg/L of arsenic to below detectable levels in less than an hour. Calo's presentation will focus on the spouted vessel/fixed bed filter system for removing arsenic from water, and he will share his most recent research results.

In the second presentation SRP Researcher Girish Srinivas, Ph.D., will discuss research being conducted by TDA Research, Inc. (TDA) to develop a cost effective, simple point-of-use (POU) water purifier. The purifier is based on capacitive deionization (CDI) for removing problematic toxic ionic contaminants from well water not attached to a large public water works. TDA's CDI technology can effectively remove perchlorate, nitrate, arsenic, lead, and other harmful inorganic ions from well water to meet EPA drinking water specifications in a simple, DC powered device. The technology can be used for POU applications (e.g. under the sink) in homes that use well water or in developing countries at well sites, where, if power is unavailable, it can be operated using a simple photovoltaic system.

• Joseph Calo, Ph.D., Brown University (Joseph_Calo@Brown.EDU)
• Girish Srinivas, Ph.D., TDA Research Inc. (gsrinivas@tda.com)
• Dr. Steven C. Gebhard, P.E., TDA Research Inc. (gebhard@tda.com)

• William Suk, Ph.D., director, Superfund Research Program (suk@niehs.nih.gov)
  
  

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