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Wastewater

Olpas sensors for water treatment are especially used for challenging measurement: high loads (ex. influent or activated sludge), or a wish for exceptional drift resistance with longer maintenance windows.

Communal (sewage / urban) wastewater has unique properties that make it difficult to measure solids concentrations (such as Total Suspended Solids (TSS), Mixed liquor suspended solids (MLSS), and sludge concentration) using conventional (optical or other) sensors. This difficulty is due to factors such as fouling, the presence of air bubbles, and struvite precipitation.


For these difficult-to-measure situations, Olpas offers a range of sensors that can accurately measure concentration levels in both water treatment and sludge processing.


Thanks to the specific characteristics of the OLPAS Technology and its sensors, currently most value is delivered on these locations in the wastewater treatment plant:

  • Influent

  • Activated sludge

  • Return activated sludge

  • Sludge dewatering

  • Polymer-concentration measurement


Olpas is constantly developing new applications. In Urban water treatment, but also in other fields. Make sure to get in touch if you have a need for a specific measurement that should be less prone to (bio)fouling and precipitation, that requires longer maintenance windows or that has not been tackeled yet succesfully using the traditional optical or microwave based measurement technologies.

Applications in this field

An Olpas Sludge Concentration sensor installed at a WWTP

TSS - Total Suspended Solids

Total Suspended Solids (TSS) is the portion of not dissolved solid particles suspended in water.
This includes organic and inorganic materials, such as silt, decaying matter, industrial wastes, and sewage.

An Olpas Sludge Concentration sensor installed at a WWTP

Polymer (PE) concentration in low concentrations

Polymers are aded during the watertreatment process to enhance the removal of suspended solids and other contaminants. Olpas sensors help monitoring polymer-concentrations during the process and even in effluent.

An Olpas Sludge Concentration sensor installed at a WWTP

High Solids Concentration Measurement

Available for inline measurement (with the sensor in direct contact with the fluid or paste) and as a clamp-on (for measurement through the pipe).
For high solids concentrations up to 60 %DS.

An Olpas Sludge Concentration sensor installed at a WWTP

MLSS - Mixed Liquor Suspended Solids

Mixed Liquor Suspended Solids (MLSS) is the concentration of suspended solids in an aeration tank during the activated sludge process, which is a key parameter to monitor the active biomass.

An Olpas Sludge Concentration sensor installed at a WWTP

Sludge Concentration (Solids concentration in sludge)

The Olpas Sludge Concentration sensors offers a cost-effective measurement with maintenance intervals that are four times longer compared to optical sensors.

An Olpas Sludge Concentration sensor installed at a WWTP

RAS - Return Activated Sludge

RAS indicates the portion of settled activated sludge that is returned from the clarifier to the aeration tank.
Maintains a high concentration of microorganisms for effective biological treatment.

An Olpas Sludge Concentration sensor installed at a WWTP

Polymer (PE) concentration in high concentrations

Olpas PCM (Polymer Concentration Measurement) measure high concentrations of PE/Polymer flocculant for monitoring of the PE dissolution/activation process.

Available Products

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Number of selected Products: 

14

OBO-MLSA

OBO-MLSA

MLSS / (activated) sludge concentration (Tentacle version, Chain mounting)

Factory callibrated sensor with modbus interface.  No screens or buttons necessary. 

OTU-MLSA

OTU-MLSA

MLSS / (activated) sludge concentration (Inline)

Factory callibrated sensor with Modbus interface. 

Extended transducer for easy installation and maintenance with Hot-Tap retractable.

OTU-TSSB

OTU-TSSB

TSS concentration (Inline mounting)

Factory callibrated sensor with Modbus interface. 

Extended transducer for easy installation and maintenance with Hot-Tap retractable.

OTE-TSSC

OTE-TSSC

TSS concentration in challenging environments

Olpas TSS sensors are pre-calibrated, drift-resistant and required very few maintenance; thanks to an industry leading fouling resistance and minimal sensor drift. 

OTU-IWAA

OTU-IWAA

Dry Solids (%DS) measurement in Iron water / Iron sludge (Inline mounting)

Measurement of dry matter (dry solids, DS) in iron water, iron sludge, ferric (hydr)oxide. 


OBO-IWAA

OBO-IWAA

Dry Solids (%DS) measurement in Iron water / Iron sludge (Submersible, chain mounting)

Measurement of dry matter (dry solids, DS) in iron water, iron sludge, ferric (hydr)oxide. 


OTU-PCMB

OTU-PCMB

Polymer Concentration Measurement (PCM) - Membrane safeguarding (Inline)

Measuring Polyelektrolyte (PE)/Polymer/Flocculant/Coagulant in low concentrations, as part of safeguarding and monitoring tool for membranes.  Easy installation and maintenance with Hot-Tap retractable.

OTU-SDXA

OTU-SDXA

Sludge Concentration (Inline mounting, hot-tap transducer)

Factory callibrated sensor with Modbus interface. 

Extended transducer for easy installation and maintenance with Hot-Tap retractable.

OTD-SDPB

OTD-SDPB

TSS in dewatering centrate (with centrate pump and flowcell)

An easy to install end-to-end measurement solution with limited impact of air-bubbles and exceptional fouling resistance thanks to ultrasound measurement technology.  For measuring TSS in concentrations from 0 - 2.000 mg/L. 

The device consists of a sample grabber (centrate pump) and flow-cell.

OTU-SDXB

OTU-SDXB

TSS in dewatering centrate (inline mounting, hot-tap transducer)

Factory callibrated sensor with Modbus interface. 

Extended transducer for easy installation and maintenance with Hot-Tap retractable.

OTD-SDPC

OTD-SDPC

Residual Polymers in dewatering centrate (with centrate pump and flowcell)

An easy to install end-to-end measurement solution with limited impact of air-bubbles and exceptional fouling resistance thanks to ultrasound measurement technology.  For measuring polymer concentrations. 

The device consists of a sample grabber (centrate pump) and flow-cell.

OTU-SDXD

OTU-SDXD

Sludge Cake Concentration (Inline mounting, SS316 transducer)

Factory callibrated sensor with Modbus interface. 

Extended transducer for easy installation and maintenance with Hot-Tap retractable.

OTD-SDWE

OTD-SDWE

Sludge Cake Concentration - Grabbing Solution and Sensor

The Olpas sludge concentration measurement system consists of a dataprocessor and ultrasound transducer, with a sample grabber.  The system is capable of measuring sludge in concentrations from 0 - 40 %DS. 

The Olpas ultrasound technology provides a fouling-resistant measurement of the sludge concentration, independent of sludge type or morphology.

OTD-THRC

OTD-THRC

Solids Concentration Measurement - Through Pipe (Clamp-on) [TRL-7]

Clamp-on sensor for measurement through pipe.

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