Great Ships Initiative: Report of the Land-Based Freshwater Testing of the Simens SiCURE™ Ballast Water Management System

This Great Ships Initiative (GSI) technical report describes outcomes from land-based tests conducted in August through October 2009, on the SiCURETM Ballast Water Management System (BWMS) in cooperation with German Bundesamt für Seeschifffahrt und Hydrographie (BSH), i.e., the German Federal Maritime and Hydrographic Agency. The SiCURETM BWMS combines filtration, electrolytic chlorination, and proprietary system control logic to eliminate unwanted aquatic species in ballast water. In terms of electrolytic chlorination, the system evaluated at GSI used 5.5 m3/hr side flow that, by passing through an electro-chemical generator, was enriched with about 200 mg/L of chlorine to treat 200 m3/hr water flow. The system was designed to produce a maximum of 6 mg/L of chlorine, however the actual dose level was defined by an oxidation-reduction potential of the treated water. During the series of five consecutive valid trials, the SiCURETM BWMS was evaluated for its ability to: (a) successfully treat ballast water without interruption, (b) meet International Maritime Organization (IMO) D-2 discharge standards after a five-day holding time, and (c) discharge water after the five day retention period that is environmentally benign (i.e., no residual toxicity) pursuant to US Environmental Protection Agency water quality criteria. The Siemens SiCURETM BWMS functioned properly during the five consecutive trials, and was highly effective at reducing live organism densities in the fresh water ambient conditions of Duluth-Superior Harbor, as amended in these tests to achieve IMO-consistent challenge conditions. Live organisms in the regulated size classes were discharged in densities below the IMO D-2 standard. Microbial analyses showed system performance in keeping with IMO requirements for bacteria. Chemistry data generated across trials indicated the post-retention discharge to have well less than 0.1 mg/L total residual chlorine (TRC) under ambient conditions. Ambient water collected immediately after treatment and held in a cold environment had TRC and total residual oxidant (TRO) levels which slightly exceeded this level. However, in a real world application, the intake water would also be cold, and developers claim that the test system is designed to respond to this circumstance (reflected in oxidation-reduction potential, or ORP) with a reduction in chlorine generated and injected into the intake stream. There were no acute toxic effects of treated discharge on any test species across assays and trials. Chronic toxicity effects in 100 % effluent were detected in one out of two trials for test species of zooplankton and phytoplankton. There were no chronic toxicity effects across organisms and trials in 50 % or lower effluent dilutions.


2010 GSI Land Based Testing Simens SiCURE