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Customer case:

Valmet goes underground to help treat wastewater

The Kakolanmäki wastewater treatment plant, jointly owned by 14 municipalities, has been operating in the southern Finnish city of Turku since the beginning of 2009. Since the plant is built underground it has a more constant and higher temperature than surface facilities, a distinct advantage for treatment conditions. It is able to process the wastewater from 300,000 people and various industrial sources in a way that considerably reduces the nutrient load on the Baltic Sea.

It works really well and gives operators a continuous indication of how well the centrifuge is working and effectiveness of the polymer which is a great aid for optimization. The time consuming laboratory tests have been reduced to 3 times per week. We are also able to trial different polymers and polymer qualities without loading the laboratory, while getting much more reliable information instantly.”
Jouko Tuomi, Plant Process Engineer
Summary
Location Turku, Finland
Customer challenge

More effective plant operations using online measurements

Solution Valmet Total Solids Transmitter (Valmet TS), Valmet Dry Solids Measurements (Valmet DS) and Valmet Low Solids Measurement (Valmet LS)
Results

Laboratory measurements have been reduced from 1 or 2 per day to 3 times per week

Stop pumping from the clarifiers when the sludge content drops below 3.5% and avoid diluting the sludge storage with excess water

Polymer dosing and centrifuge control based on online total solids and low solids measurement

Operators can be sure that the target of 22% solids content is met

Maintenance needs are minimal

Keywords Wastewater, Automation, Europe

Product and company names changed from Metso to Valmet. Valmet acquired Metso’s Process Automation System business and products on April 1st 2015.

Valmet Total Solids Measurement - Valmet TS

Valmet TS is a total solids measurement for wastewater sludge treatment, based on microwave technology, to optimize the sludge dewatering process and polymer dosage, as well as primary and secondary clarifiers.

Valmet Dry Solids Measurement - Valmet DS

Valmet DS is a microwave based cake solids sensor for conveyed sludge, used for better dewatering control, allowing savings in polymer usage and sludge transportation costs.

Valmet Low Solids Measurement

Valmet Low Solids Measurement (Valmet LS) permet aux opérateurs de station de traitement des eaux usées de mesurer la faible teneur en solides dans les applications complexes telles que les centrats de centrifugeuse et les solides en suspension de liqueur mixte dans le bassin d'aération. Jusqu'à présent, il n'existait aucune technologie de mesure en ligne permettant la mesure fiable d'agents présentant une très faible teneur en solides.