Shaftless Screw Conveyor and Diverter Gate for Dewatered Biosolids James Creek WRF, GA
Forsyth County Water & Sewer Department
Cumming, GA
Brown and Caldwell
Atlanta, GA
MB Kahn Construction
Columbia, SC
James Creek WRF
Suwanee, GA
General Description
The James Creek Water Reclamation Facility is located in Forsyth County, Georgia; just north of Atlanta. The plant recently underwent upgrades and improvements to expand the existing 1.0 million gallons per day (MGD) facility to a 2.55 MGD facility. Modifications to the existing treatment building included demolition of existing headworks equipment, addition of a second dewatering centrifuge, and modifications to other related systems.
The addition of the new centrifuge required a new shaftless screw conveyor to load the dewatered biosolids to trucks in the floor below. KWS supplied the conveyor plus a diverter gate after the centrifuge to redirect low percentage solids back into the process while the centrifuge is ramping up.
Design Parameters
- Product Type: Dewatered Biosolids
- Material Density: 55 to 75 Lbs. per Cubic Foot
- Capacity: 65 Cubic Feet per Hour
- Duty: 7 days a week, 24 Hours per Day
KWS Advantages
Liquid is Removed During Start Up and Cleaning Operations
The KWS design team and rep began supporting the consulting engineer on the design around three years before equipment was first used. A professional engineer from KWS consulted with the engineer face-to-face early in the design phase to assist in determining layout, sizing, and features. The KWS solution was selected by the contractor, engineer and owner. There were several design iterations until the final layout was agreed upon. Utilized the latest modeling technology, KWS created a solution that interfaced properly with the building and upstream equipment.
Special Features
KWS provided a shaftless screw conveyor since the spiral conveys the sticky and wet biosolids without the use a of center pipe. All the exterior components of the conveyor and supports were manufactured from 304 stainless steel for corrosion resistance. Both the diverter gate and slide gate utilized reliable, high torque multi-turn electric actuators. The conveyor was designed to be supported from the ceiling above the truck bay. The conveyor was designed with a drain so the conveyor could be rinsed and have the liquid piped away. The interface from the diverter gate to the conveyor include a UHMW-lined chute to prevent the biosolids from sticking. All of the electrical components utilized explosion-proof enclosures.
Testimonial
"Any issues were resolved quickly and to the satisfaction of all parties involved. We appreciate KWS’s efforts on making this a successful project."
Kristen Lindsey, Project Manager – MB Kahn Construction
Stainless Steel Structural Supports are Corrosion Resistant
New KWS Conveyor is Supported from Ceiling in Truck Bay
Slide Gate is Opened and Closed to Evenly Load Biosolids in Trucks
Slide Gate Control Panel Provides Easy Operation
