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Total Mass Control is a process control approach for activated sludge treatment of wastewater that takes into account the total amount of activated sludge in the system. That means the quantifying and controlling the sludge mass in the aeration basin(s) and the secondary clarifier(s). An important difference compared to other process control methods is the mass of sludge is quantified in the secondary clarifiers.
Operators that use the Total Mass Control approach maintain a constant total sludge mass that is close to a total sludge mass target, as shown in this figure
The benefits of Total Mass Control include:
Creates a stable system resistant to process upsets
Provides actionable information controlling sludge wasting and the amount of sludge in clarifiers
Enables enhanced performance such as consistent winter nitrification
Assists with identifying factors impacting performanceÂ
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