55.00 $ USD500.00 $ USDUSD

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After many year of process follow-up and troubleshooting in collaboration with wastewater treatment plant operators, MCR Process & Technology has developed new tools to assist operators in there daily tasks. The STIRO-SETTLOMETER is one of these tools, and was designed to meet a need for a more representative test, or measure, for evaluating sludge settleability in secondary clarifiers.

The STIRO-SETTLOMETER is a laboratory equipment inspired by the method and specifications given in the Standard Methods 2710C for the evaluation of the sludge settleability. From the laboratory results it is then possible to calculate the SVI (sludge volume index), SSVI (stirred sludge volume index) and ZSV (zone settling velocity) indexes.

It consists of a motor, mounted on a 2 liters cylinder, which actuates a low speed stirring mechanism. This mechanism limits the interferences associated with floc bridging and wall effects.

Comparing results obtained using the STIRO-SETTLOMETER with the classical SVI test (without stirring) can reveal the importance of filamentous bridging on sludge settleability, a bad floc formation or the presence of a non-filamentous bulking effect. The result of this test can help the operator define the process strategy to eliminate a bulking situation.

Here is some additional downloadable information on the Stiro-settlometer. The files are in PDF format.

Below are a few of our most frequent questions, along with their answers. Fell free to contact us directly  if you don’t see your question listed below. 1-418-650-9154 or

See also General FAQ

Additional information


Kit for SSVI and SVI, SSVI (only), Additional 2L acrylic cylinder with 0-1000 ML SCALE FOR SSVI AND SVI and 0-28 CM SCALE FOR ZSV, Mixing paddle