Stirred Sludge
SSVI Stirrer & Procedure.
2 RPM Sludge Settlement Compliance
Standardised SSVI Analysis: Achieving Precise 1 cm/sec Tyne Velocity for Repeatable Results
The Boltac Stirred Sludge Volume Index Stirrer is designed specifically for stirred sludge volume index testing where controlled low-speed stirring and consistent test timing are essential. Supplied in either 3-litre, 2-litre, or 1-litre versions, an upright clear acrylic vessel with stainless steel stirring components. The unit operates at 2 RPM, delivering a 1 cm/sec tip velocity. A simple timed sequence supports the standard 30-minute test, with LED time indication and an audible end signal. Extended run modes of 24, 12, 6, 3, 2, or 1 hour are also available via the single control button where required.
The problem and the Boltac solution
| The Operational Problem | The Boltac SSVI Solution |
|---|---|
| Motor Stalling & Speed Fluctuations | High-Torque Motor Our motor drive system is controlled specifically for 2 RPM. It provides the constant power needed to move the tynes through the sludge samples at 1 cm/sec without deviation. |
| Geometric Inaccuracy | AWWA Standardised Geometry Scaled for correct tyne velocity and wall clearance. We offer 3, 2, and 1-litre clear acrylic vessels with integrated % settlement scales for immediate, visual data. |
| Human Error & Timing Misses | Integrated Digital Timer Settlement data is required at exactly 30 minutes. Our timer counts down and alerts technicians at the finish line, ensuring data capture aligns perfectly with your SOP. |
Key Benefits
- 2 RPM stirring with a 1 cm/sec tip velocity.
- Simple, single-button-operated control in a durable enclosure
- Standard 30-minute timed run.
- LED time indication with audible end signal.
- Extended duration modes up to 24 hours.
- 3-litre clear acrylic cylinder with 3- 2- and 1-litre scales.
- 2-litre vessel with 2, & 1-litre scales.
- 1-litre vessel with 1-litre scale.
- Stainless-steel stirring components
Best For
Stirred sludge volume index testing, activated sludge settlement analysis, wastewater laboratory testing, and applications requiring timed low-speed sludge stirring.Talk to Boltac about the right stirred sludge testing setup for your laboratory or plan
Download Stirred-Sludge-Volume-Index
Boltac Jar Stirrers are in use in twenty-six countries globally
They are used in Australia, Fiji, the Cook Islands, Singapore, Indonesia, the United States of America, the United Arab Emirates, Saudi Arabia, Egypt, Jordan, Malaysia, Belgium, France, Azerbaijan, Micronesia, South Africa, Canada, England, New Zealand, Mexico, Lao, Palau, Thailand, China, Solomon Islands, Oman.
FAQ
Q: What is the required tyne velocity for SSVI sludge settlement testing?
A: For Stirred Sludge Volume Index (SSVI) compliance according to AWWA standards, the stirrer tynes must rotate at approximately 2 RPM providing a linear velocity of precisely 1 cm/s). The Boltac SSVI Stirrer is engineered with specific tyne (stirring rod) diameter and clearance between the tynes and the vessel according to AWWA Standard Methods.