DEWATERING ENERGY USAGE: A REVIEW OF COMPARATIVE STUDIES

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Abstract:

Developed by a Canadian government agency 10 years ago, the Rotary Press sludge dewatering equipment is an emerging technology manufactured and commercialized by Fournier Industries Inc. There are now Rotary Press installations in 3 continents: North America, Europe and Asia. The Rotary Press presents several sustainability features: In addition to controlling GHG emissions, limiting wash water requirements, generating higher solids and operating at low noise, the Rotary Press specially features low energy usage.

This presentation reviews two energy comparison studies of the Rotary Press vs. competitive technologies: Plate and Frame Press and Centrifuge, Comparison with Plate and Frame Press was made side-by-side during a 3-months period, on raw sludge from the Montreal Urban Community WWTP. Comparison with the Centrifuge was performed on anaerobic sludge from two different but similar Canadian wastewater treatment plants. Energy usage expressed in kW per dry ton of dewatered solids is presented for both case studies.

On a strictly energy efficiency point of view, Plate and Frame Press as well as centrifugal dewatering are not optimal when compared to the Rotary Press. On a 3 months full scale, side by side piloting trial, the Rotary Press installation proved to be using much less installed power than a Plate and Frame Press system. Energy usage was only 25 kW-hour/dry Ton for the Rotary Press dewatering system.

On a more extensive power usage study, centrifugal dewatering was proven to use more than 10 times the energy required by the Rotary Press. Over a 20 years period, Rotary Press energy savings represent a present value of up to 375,000 Can, using the Hydro-Quebec rate (one of the lowest rate in the world).

Document Type: Research Article

DOI: http://dx.doi.org/10.2175/193864702785302582

Publication date: January 1, 2002

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  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

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