Shafted and Shaftless Screw Conveyors for Handling Residuals at Amherstburg WWTP in Ontario, Canada

General Description of the Application

The Amherstburg Public Works Department in Ontario, Canada is responsible for the maintenance of the Town’s sewage collection systems working in cooperation with the Ontario Clean Water Agency (OCWA). OCWA operates the sewage treatment facilities. There are six treatment facilities within the Amherstburg town limits. They are the Amherstburg Wastewater Treatment Plant, the Big Creek Treatment Plant, the McLeod Sewage Treatment Plant, the Boblo RBC, Edgewater Lagoons and McGregor Lagoons.

End User or Owner Town of Amherstburg A 2005 study showed the Amherstburg WWTP was reaching capacity and when there were combined Amherstburg, Ontario sewers and storms, Amherstburg was sometimes sending sewage to the Detroit River. The plant took more than three years to improve and can now serve Amherstburg for the next 25 to 30 years. Consulting Engineer CH2M Hill Canada Ltd KWS Environmental was involved with a project that included modi cations and additions to the Toronto, Ontario existing water reclamation facility's primary and secondary treatment facilities including grit, screen- Contractor ings and biosolids residuals processing improvements. Residuals from grit classi ers, screens and FACCA Inc. centrifuges were transferred to disposal using KWS Environmental shaftless and shafted screw Ruscom, Ontario conveyors.

Plant Name and Location Amherstburg WWTP Design Parameters of Application Amherstburg, Ontario Type of Residual: Dewatered Sludge/Biosolids Material Density: 63 to 70 Lbs. per Cubic Foot Solids, percent by weight: 25-percent Capacity (max): 3.5 Tons per Hour Capacity: 120 Cubic Feet per Hour Duty: 24 Hours per Day, 7 Days per Week

Type of Residual: Grit and Screenings Material Density: 50 to 110 Lbs. per Cubic Foot Solids, percent by weight: 30-percent Capacity (max): 1.5 Tons per Hour Capacity: 60 Cubic Feet per Hour Duty: 24 Hours per Day, 7 Days per Week

KWS Manufacturing Advantages Provided by KWS 3041 Conveyor Drive Burleson, Texas 76028 KWS Environmental designed and manufactured both shaftless and shafted screw conveyors for all types of residuals at the Amherstburg WWTP. The best conveying technology was chosen for each Toll Free: (800) 543-6558 application. KWS Environmental has experience with many dierent types of mechanical conveyors Phone: (817) 295-2247 and has the ability to design and manufacture the most appropriate conveyor and features for each Fax: (817) 447-8528 unique application.

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The KWS Environmental shaftless screw conveyors at the bottom of grit tanks required precise design and tolerances to support the need for a watertight conveyor while being submerged under a water head load.

KWS supported the installation, commissioning and training by providing a quali ed and registered engineer familiar with the project, design requirements and equipment delivered.

Special Features of KWS Design

End User or Owner The shaftless screw conveyors at the bottom of the grit tanks required the drive shaft to penetrate the Town of Amherstburg Amherstburg, Ontario grit tank wall and for the shaft seal to be completely watertight while under pressure with a head load in the grit tank. KWS Environmental used a split mechanical seal to ensure that this requirement was Consulting Engineer met. The split seal allowed removal for maintenance without disrupting the drive or drive shaft. CH2M Hill Canada Ltd Toronto, Ontario KWS Environmental utilized shafted screw conveyors with the exclusive Tor-Ri-Flex bearing in an area Contractor of limited access for maintenance. It was not possible to use a shaftless screw conveyor because FACCA Inc. access from above to change liners that would be required was not available. Shafted screw convey- Ruscom, Ontario ors were the best option given the maintenance access limitations. The KWS Tor-Ri-Flex bearing assembly eliminated any major maintenance on the conveyors, except routine lubrication. Routine Plant Name and Location lubrication is achieved automatically using spring-actuated lubrication pots which can be replaced Amherstburg WWTP Amherstburg, Ontario without tools. Should major maintenance be required, the bearing assembly can be removed without interrupting the adjacent screw sections.

Testimonial

"The equipment was easy to install and there were no installation issues. The conveyors run great!"

David Dodsworth, Project Manager - D2WC

KWS Manufacturing 3041 Conveyor Drive Burleson, Texas 76028

Toll Free: (800) 543-6558 Phone: (817) 295-2247 Fax: (817) 447-8528

www.kwsmfg.com