“Better wastewater treatment” is not a sufficiently precise dosing objective. The first question is what the chemical addition is meant to achieve at this works, and where that result should be assessed.
Compass CPR and Compass CEP are separate wastewater approaches. They both use a site-specific feed-forward prediction, but they are developed around different treatment duties. Keeping those duties distinct gives the measurements and the model a clear purpose.
CPR: the phosphorus-removal duty
Compass CPR addresses chemical phosphorus removal. A phosphorus-related input or surrogate is considered alongside the rest of the influent because coagulant demand is not determined by phosphorus alone. The appropriate measurements, sampling basis and prediction are reviewed against the works and its agreed phosphorus objective.
Time-aligned influent records and laboratory results help the team understand how the demand changes. The model must be assessed in the context of the existing treatment and dosing arrangement; a generic number from another site would not describe this works.
CEP: the pre-treatment duty
Compass CEP addresses chemically enhanced pre-treatment ahead of primary clarification. Here the discussion starts with the primary-effluent or downstream loading objective. Incoming solids and optical or organic measurements may help describe changing demand, subject to the measurement evidence available at the site.
The control objective is defined around that treatment stage. It should not inherit a phosphorus-removal claim simply because both approaches involve a coagulant.
Make the trend legible
An operator-facing view can place influent changes and the calculated dose on the same timeline, with the selected treatment outcome shown separately. Label units and sample points plainly. Any example readings displayed on this Compass preview are fictional design data and must not be used as evidence of savings, compliance or treatment performance.
Define the application before the instrument list
Bring the influent characteristics, treatment stage, existing measurements, reference methods and current control arrangement to PMA. The proposed instrumentation and algorithm depend on the applicable Compass generation and the process evidence. That review establishes whether CPR or CEP is the right starting point, and which additional data is needed.
Once the objective is clear, the visuals can do their proper job: showing how the process changes, what the model predicts and what the plant team needs to check next. PMA’s wastewater application overview provides the published product context.
