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.

Kakolanmäki wastewater treatment plant uses Valmet's solids measurements
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.

Total Solids Measurement

Valmet Total Solids Measurement (Valmet TS) is a reliable and accurate microwave real time measurement used to control and optimize the solids treatment process, giving operators information on the total solids 24/7.

Dry Solids Measurement

Valmet Dry Solids Measurement (Valmet DS) utilizes microwave technology, requiring no special certification or safety procedures, to make a stable and accurate solids measurement for dewatering control in wastewater treatment.

Low Solids Measurement

Valmet LS, a low solids measurement, is the only meter that works for centrate suspended solids, saving polymers while optimizing the wastewater treatment.