SDI kits

Automated SDI kits are available that can be installed on the RO influent line (see Chapter 3.8 for more information about SDI). These kits provide the hardware and software to run up to 5 consecutive SDI tests and perform the SDI calculations without operator attention. Should an automated kit not be available, manual SDI equipment should be installed. Equipment required for a manual SDI system is shown in Figure 3.6. 

Microtox Solid-phase test SDI Vibrio fischeri is added to a suspension of the test sample. Subsequently, the mixture is filtered using the device supplied with the kit, and the light emission of the supernatant is determined. The method is a further development of the acute luminescent bacteria test for aqueous samples. Contact test with Bacillus cereus DSM No. 351 Effects on the dehydrogenase activity of the test bacterium after an exposure time of 2 hours are investigated using resazurine reduction (Ronnpagel etal. 1995). 

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