Jul 12: U.S. EPA's Science Advisory Board (SAB) has issued its finalized advisory report -- Efficacy of Ballast Water Treatment Systems -- responding to a request from the Agency's Office of Water (OW) [See WIMS 5/24/11]. OW requested SAB to provide advice on technologies and systems to minimize the impacts of invasive species in vessel ballast water discharge. Vessel ballast water discharges are a major source of non-indigenous species introductions to marine, estuarine, and freshwater ecosystems of the United States.
Ballast water discharges are regulated by the EPA under authority of the Clean Water Act (CWA) and by the United States Coast Guard (USCG) under authority of the National Invasive Species Act (NISA). At present, Federal requirements for managing ballast water discharges rely primarily on ballast water exchange; however changes to federal ballast water regulations are under consideration. On August 28, 2009, the USCG proposed revising their existing rules to establish numeric concentration-based limits for live organisms in ballast water. The proposed rule would initially require compliance with a "Phase 1 standard" that has the same concentration limits as the International Maritime Organization (IMO) D-2 standard and subsequently require compliance with a more stringent "Phase 2 standard." EPA's existing CWA general permit for vessels will expire on Dec. 19, 2013. In its revisions to the vessel general permit, the EPA is considering numeric standards that limit the number of live organisms in discharged ballast water.
To prepare the report, the SAB Panel reviewed a "Background and Issues Paper" prepared by OW and USCG (June 2010) as well as information on 51 existing or developmental ballast water management systems (BWMS) provided by OW and the public, although detailed data were available for only 15 BWMS.
In addition to responding to four specific charge questions, the SAB Panel indicated, ". . .the Panel's overarching recommendation is that the EPA adopt a risk-based approach to minimize the impacts of invasive species in vessel ballast water discharge rather than relying solely on numeric standards for discharges from shipboard BWMS. The Panel found that insufficient attention has been given to integrated sets of practices and technologies that could be used to systematically advance ballast water management. These practices include managing ballast uptake to reduce the presence of invasive species, reducing invasion risk through operational adjustments and changes in ship design to reduce or eliminate the need for ballast water, development of voyage-based risk and/or hazard assessments, and treatment of ballast water in onshore reception facilities. The Panel recommended that a comprehensive analysis be done to compare biological effectiveness, cost, logistics, operations and safety associated with shipboard BWMS and onshore reception facilities."
Access the complete 154-page review (click here). Access the Ballast Water Advisory panel website for background information and further details (click here).