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September 14th If you want to know how to save money check Free Gift Cards offers - Shipyards examine wastewater streams to reduce potential pollutantsMichael Champ of ATRP, VA chaired the first of five special meetings at
Oceans '99 focusing on the waste streams from shipyards and drydocks. Champ stressed the importance that the marine industry know the characterization of such waste streams as well as means to treat toxic portions. This
special series of sessions highlights the progress being made at major research centers associated with shipyards in the United States.
Characterization of Stormwater Discharge from a Marine Drydock - A O Akan, et al., Old Dominion University, VA Gary Schafran spoke first regarding what potential pollutants comprise stormwater runoff from drydocks and
shipyards. Runoff water from storms must be monitored separately from a shipyard's wastewater stream. Schafran's group took a close look at stormwater effluents exiting a typical marine shipyard. Eventually he
hopes to provide an understanding of how activities on drydock influence the characteristics of the runoff. The study was primarily concerned with metals (copper, zinc & lead) as well as total dissolved solids. Schafran
found that pH and DOC strongly controlled mobilized dissolved metals. He also noted mobilization of particulate metals, on the other hand were controlled by rate of surface runoff. By identifying how influences such as
pH affects contaminant metals in surface runoffs, Schafran believes shipyards can keep contaminant levels at a minimum. Contact: schafran@cee.odu.edu
Characterization of Shipyard Wastewater Streams - B Kura & R Tadimalla, University of New Orleans, LA Bhaskar Kura's research takes a different track. His group at the University of New Orleans focused
on how shipyard processes contribute to their wastewater streams. The emphasis is to relate the operational processes to wastewater characteristics. Kura notes shipyard operations include hull cleaning, metal plating,
solvent degreasing and many more. All contribute inputs of contaminants to the yard's wastewater. Kura hopes to create a characterization scheme relating inputs such as spent abrasives, paint
chips, cleaning solutions to the processes AND to the make up of the wastewater. Such a scheme will allow shipyards to efficiently manage operations to reduce or treat those tasks that create contaminants of concern in the
resultant wastewater. Contact: Bhaskar Kura, Ph.D. - bxkce@uno.edu Australia Regulation of Shipyard Discharges and the Potential of UV Oxidation for TBT Degradation in Washdown
Water - L E Fletcher & J A Lewis, Defence Science & Technology Organization, Australia Regulation of Shipyard, Australia Absent from the Seattle meeting, Michael Champ gave John Lewis' presentation.
Lewis' group at the Aeronautical and Maritime Research Lab has been performing extensive field tests on treatment of wastewater from shipyards, the results of which Lewis intended to present. Champ notes such tests have been
underway since Australia will require drydocks to treat effluents, particularly for the chemical biocide tributyltin (TBT). According to Lewis, one promising technology from the Australia study is enhanced oxidation of TBT
using ultraviolet light. Early lab tests found up to 90% TBT degradation with less than one-minute exposure times. A pilot plant is under construction to scale up volumes. Contact John Lewis: john.lewis@dsto.defence.gov.au |
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