Treatment of ballast water; how to test a system with a modular concept?

摘要: A variety of methods were successfully applied to examine the efficacy a modular ballast water system according standards as adopted by International Maritime Organization. The treatment had capacity 530 m3 h(-1) consisted pump system, hydrocyclone, 50 microm mesh-size self-cleaning filter and an installation for addition chemical disinfectant (PERACLEAN Ocean). land-based testing facility used natural sea high turbidity during spring phytoplankton bloom. mesozooplankton fraction was inspected with standard binocular. Larger zooplankton effectively removed filter; smaller sized containing larvae nauplia killed after treatment. component monitored using flow cytometry. huge colonies Phaeocystis globosa disrupted in hydrocyclone liberating colony cells which passed single through filter. These remained viable but finally secondary (chemical) step. Bacteria also all mechanical steps unharmed final Viability tests SYTOX Green, specifically designed phytoplankton, showed that did not affect percentage short-term, several hours cell counts dropped down 70%. Phytoplankton recovered within day formed new dense bloom rapidly. bacteriostatic (H2O2) present days preventing regrowth bacteria up 15 addition. In conclusion, IMO met unit instruments assays effective rapid tools qualify quantify organisms well their viability.