Sodium Meta-Bisulphite Dosing System Sample Clauses

Sodium Meta-Bisulphite Dosing System. Two completely independent systems are provided – a primary and a secondary dosing system, to ensure maximum reliability of this critical dosing function. Sodium Meta-Bisulphite (Na2S2O5) is supplied in powder form and is transferred to one of the four stainless steel mixing / dosing tanks – two 24 hour capacity tanks (4m3) for the primary and secondary systems respectively. The sodium meta-bisulphite is mixed with water to form sodium bisulphite, which is facilitated by a motorised mixer. Each pair of tanks feed two 100% duty dosing pumps. The dosing rate of both systems is proportional to process flow using a control signal from the cartridge filter feed pump flow and a signal from the residual chlorine analyser, located after the cartridge filter pumps. Both the primary and secondary sodium bisulphite solutions are discharged into a static mixer prior to the cartridge filters. The reason for dosing before the cartridge filters is that when the plant was designed and built, this was a mandatory requirement of the membrane supplier. The apparent philosophy being that any biological fouling will first take place within the cartridge filters and not the membranes and so remedial action could be taken. We disagreed with this philosophy, on the basis that the cartridge filters would become a source of biological contamination of the entire membrane system and our view was that the de- chlorination point should be located after the cartridge filters. After two years of operation, it was decided to move the de-chlorination point just downstream of the cartridge filters. The entire redox detection system was moved and the sample piping revised because the time available to detect the presence of chlorine and shut the RO streams down before chlorine entered the membranes was considerably reduced.‌ Furthermore the pipework arrangement at the cartridge filters did not allow the inclusion of a static mixer. Following detailed computational fluid dynamics modelling of the pipework and injection systems we satisfied ourselves that the sodium bisulphite would have mixed properly before the redox instrumentation. This modification was made during the summer of 1992. The effect was to more than double the cartridge filter life to more than 2 months operation and the membrane cleaning frequency, under normal conditions to in excess of 3 months.
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