Westhead WwTW Tertiary Nitrifying SAF (N-SAF) plant The N-SAF units specified by this United Utilities project were designed as twin stream and required to be constructed out of stainless steel for an above ground location. The top level of the SAF units can be accessed via a common staircase to ensure ease of access for any maintenance and visual inspection. The air required for the process was also sized to scour

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