07 Rob Paramore 2020 · 2020. 10. 22. · Microsoft PowerPoint - 07 Rob Paramore 2020.pptx Author:...

www.processinstruments.co.uk

Process Instruments (UK) Ltd.

Dr Rob Paramore- Process Instruments (UK) Ltd.

Coagulation Control; before and after


Discussion points

• Who is Pi and why are we talking at this event?

• What is our CoagSense coagulation control system?

• The importance of site surveys from coagulation experts

• Before and after coagulation improvements


Who we are and why are we talking at this event?

Process Instruments (Pi) head office in Burnley, approximately 30 minutes

from Manchester.We have sales offices in Ireland,

France and China

Free Chlorine

Total Chlorine

Combined Chlorine

Turbidity

Suspended Solids

Chlorine Dioxide

Flow

Streaming Current

UV254

Hydrogen Peroxide

Peracetic Acid

High Level Chlorine (16%)

Conductivity

pH

ORP

Fluoride

Particle Counters

Ozone

Dissolved Oxygen

High Level ClO2

Fluorescence

Algae

Pressure

Level

Turbidity

Flow

Streaming Current

UV254

Conductivity

pH

CoagSense


Flow

pH (Conditioned)

Colour

Coagulated pH Streaming Current

Turbidity (Conditioned)

UV254

Turbidity (raw)

pH (final)

Existing control signals

What is Pi’s CoagSense coagulation control system?


SCM UV254 Turbidity pH

Dosing %e.g. 28.4%

Dosing %e.g. 29.1%

Dosing %e.g. 47.9%

Dosing %e.g. 27.8%

Actual pump dosing 28.4%

Multi Single Parameter Control

Validation Validation

Feed-back Feed-backFeed-forward Feed-forward



SCM reading alarm e.g. ±10

Dosing %e.g. 29.1%

Dosing %e.g. 47.9%

Dosing %e.g. 27.8%






Importance of site surveys



Controller

Streaming current

Automatic cleaning device

for UV254

Expansion box

Soda dosed pH

UV254

Post coagulant pH


• Raw water source – Single or mixed• Physical layout.• Poor mixing. • High energy floc environments.• Sample point inappropriate.• Dosing point inappropriate.• Non-dilution of Alum.• Dilution of PAC.• Poorly sized dosing pump.• Poor instrumentation/maintenance



Before and After Coagulation Improvements

Smaller pump installed


• Additional issues identified• Inadequate mixing• Poor dosing point

selection• Poor pH adjustment • Poor instrumentation



Results

25% reduction in coagulant use60% (estimated) reduction in sludgeIncreased use of acid (Setpoint reduced)Improved UVTMore stable process



Pump A Pump A Pump A Pump A

Pump B Pump B Pump B



Of the 45+ CoagSense systems installed:Coagulant use reduction (30% average)Reduced emergency calloutsBetter quality final waterReduced sludge productionImproved process stabilityIncreased working range of raw water



Coagulation optimisation is not just about the control. You need the tools to spot the issues also.

Duty/Standby differencesIncorrect sized pumpsPoor pH readingsPoor or no mixingIncorrect dosing pointsIncorrect sampling points


Feedforward dose prediction on its own is not enough. You need to actual see what is happening after chemical addition.


Process Instruments (UK) Ltd.

Thank you!

Any Questions?

07 Rob Paramore 2020 · 2020. 10. 22. · Microsoft PowerPoint - 07 Rob Paramore 2020.pptx Author:...

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