By using an online submersible spectrophotometer, total coagulant demand on the inlet to the wastewater treatment plant can be determined. With up to 70% of coagulant demand being made up of the organics and the suspended solids, a control system that doesn’t include these elements can never truly optimise phosphorus removal, nor coagulant dosing.
In this case study, a UK site trialled a Compass CPR system to better understand their influent and test the ability of the system to output a total phosphorus and orthophosphate result without the use of reagents.
Traditional coagulation control systems in wastewater use an online colorimeter to measure orthophosphate and dose accordingly to this mg/l in conjunction with the flow. This has several disadvantages which Compass CPR overcomes.
By utilising a Compass CPR system, a wastewater site can:
- Measure total coagulant demand in real time and dose coagulant only when it is needed regardless of the source (organics, TSS or phosphorus)
- Determine online phosphorus measurement using a direct insertion sensor and without reagents. No more difficulty with filtration or ensuring there are reagents present in the analyser.
- Overall reduction in coagulant dosing, reducing OpEx and the risk of metal discharge compliance issues.
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