A Low-Cost Chemical Remediation Technology for Chromium in Shipyard Stormwater Navy SBIR FY2006.2 Sol No.: Navy SBIR FY2006.2 Topic No.: N06-133 Topic Title: A Low-Cost Chemical Remediation Technology for Chromium in Shipyard Stormwater Proposal No.: N062-133-0718 Firm: Sirom Scientific Solutions LLC 7003 Quail Wilde San Antonio, Texas 78250 Contact: Konstantinos Makris Phone: (210) 877-2208 Abstract: A novel remediation method to reduce environmental and human health risk from Cr(VI) in shipyard stormwater is in the process of being developed by SIROM Scientific Solutions. We have successfully pre-tested a low-cost, environment-friendly material to remove Cr(VI) from shipyard stormwater. We propose to use this novel material in an easily-depoyable fixed bed reactor to reduce the amount of Cr(VI) in shipyard stormwater. We propose to develop an easily-depoyable fixed bed reactor containing the proposed low-cost sorbent installed in shipyards to remove Cr(VI) from raw water before it is released into the sea. Phase I studies will include bench-scale experiments to demonstrate the efficiency of the packed bed reactor system to remove Cr(VI) from shipyard stormwater. Results from the Phase I study will demonstrate the potential use of a chemical Cr(VI) remediation system, assisting in US Navy efforts to comply with regional water quality standards of effluents discharged to marine environments at a minimum cost. The Phase-II study will scale up the bench-scale operation to a demonstration study, where the technology developed in Phase I will be tested under field conditions. Benefits: i. Use of our proposed technology as the reactive substrate in PBR systems could generate Cr(VI)-free shipyard stormwater, which would have otherwise caused health problems in biological organisms as well as humans exposed to such Cr-contaminated shipyard stormwater. ii. The proposed packed bed reactor technology is easily deployable to the field to reduce Cr concentrations in shipyard stormwater. iii. The use of our proposed technology for Cr(VI) removal could lead to significant reduction in shipyard stormwater remediation cost over current state-of-the-art approaches that are much more expensive than the proposed technology. iii. Spent sorbent material of our technology utilized for Cr(VI) removal can be disposed off via land-application because sorbed Cr(VI) is highly unlikely to desorb under normal environmental conditions. Our sorbent is classified under NON-hazardous wastes, and upon continuous contact for 2 weeks with As-contaminated shipyard stormwater (300 �g L-1 AsV/AsIII mixture @ 140 mL min-1) did not leach any significant amount of metals including As, Cr, Cu, Al, Fe, Zn, in a continuous flow column study (unpublished data). iv. Our proposed technology has demonstrated tremendous affinities towards other potential shipyard stormwater contaminants, such as, arsenic, phosphate and perchlorate, thereby complementing the overall contaminant removal capacity of the proposed remediation technology. Return