KWS Manufacturing

Grit Conveyor System for the Nacogdoches WWTP in Nacogdoches, TX

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End User or Owner

Nacogdoches Utility District
Nacogdoches, TX

Consulting Engineer

KSA
Lufkin, TX

Contractor

Pepper Lawson Waterworks
Katy, TX

Plant Name and Location

Nacogdoches WWTP
Nacogdoches, TX

General Description of the Application

The Nacogdoches Waste Water Treatment Plant (WWTP) is located in east Texas and processes an average of 12.88 MGD to provide service for over 33,000 people in the city and surrounding area. Like many Texas cities, Nacogdoches is steadily growing. With the maximum design load of 26 MGD, aging pipes and new customers, the load of grit to the plant will only increase in the coming years. In an effort to modernize, improve, and prepare for the demands of future growth, new grit removal equipment was installed to replace the worn existing equipment. KWS Environmental worked closely with the consulting engineer, the city, and the other suppliers to provide a simple solution.

Design Parameters of Application

  1. Product Type – Grit
  2. Material Density – 60 to 115 Lbs. per Cubic Foot
  3. Conveyor Capacity – 67 Cubic Feet per Hour
  4. Duty – 5 days a week, 8 Hours per Day
Grit Conveyor System for the Nacogdoches WWTP in Nacogdoches, TX - KWS

Grit Receiving Screw Conveyor Accepts Grit from Grit Chains.

Advantages Provided by KWS

KWS Environmental designed, manufactured, supplied and commissioned a grit conveyance system that included two shaftless screw conveyors to receive grit from two grit chains and discharge it to a dumpster. Custom inlet transitions between the grit chains and the receiving conveyor were designed to prevent spillage. KWS Environmental coordinated support locations with the local contractor. Designed to withstand the elements and the harsh nature of exposure to raw sewage, the heavy duty design of the new KWS grit screw conveyors placed an emphasis on maximizing the life of the wear components.

Special Features of KWS Design

KWS Environmental provided shaftless screw conveyors that were designed for the difficult application and to provide many years of uninterrupted service. The wear components in a shaftless screw conveyor are the shaftless spiral and the trough liners. KWS utilized our unique KWS-350 spirals for the application. Grit is extremely abrasive and will wear out typical shaftless spirals in a few years. The KWS-350 shaftless spirals are the hardest and toughest in the industry and specifically designed for grit applications. Most shaftless screw conveyor applications use plastic trough liners made from UHMW. UHMW wears relatively quickly in grit applications, requiring constant maintenance and replacement. KWS Environmental developed ceramic trough liners for very tough applications, such as grit conveyance. The KWS ceramic liners are ½-inch thick to provide superior wear life when compared to any polymer liner.

Another unique KWS Environmental design is our one-piece drive shaft. The drive shaft connects the drive unit to the shaftless spiral and transmits torque and rotation. KWS flanged drive shafts are machined from one piece of solid bar to eliminate the possibility of fatigue cracking at a welded joint on the shaft. The KWS one-piece drive shaft will never fail.

The motors and safety control devices for the shaftless screw conveyors were rated for the explosion-proof classified area. A flexible discharge chute was provided to allow for more precise filling of the dumpster and reduce spillage.

Testimonial

"KWS is always a pleasure to work with! They stand behind their equipment and keep their promises. Once again, the problem solvers at KWS came up with a solution for an existing shaftless screw conveyor. The super tough KWS shaftless spirals and ceramic liners were installed and have been operating with no problems. The Owner said it was such a good solution that they decided to use KWS and the KWS-350 spirals and ceramic liners on all the new conveyors in the plant."

David Wolfgang, Operator – City of Nacogdoches

Grit Conveyor System for the Nacogdoches WWTP in Nacogdoches, TX - KWS

Side View of Grit Receiving Screw Conveyor.

Grit Conveyor System for the Nacogdoches WWTP in Nacogdoches, TX - KWS

Inclined Load Out Screw Conveyor Conveys Grit to Dumpsters.

Grit Conveyor System for the Nacogdoches WWTP in Nacogdoches, TX - KWS

Cross Section of Grit Receiving Screw Conveyor Shows Ceramic Liner.

Grit Conveyor System for the Nacogdoches WWTP in Nacogdoches, TX - KWS

Another View of Inclined Load Out Screw Conveyor.

Grit Conveyor System for the Nacogdoches WWTP in Nacogdoches, TX - KWS

Bulkhead Trough End with Adjustable Flanged Gland Seal on Grit Receiving Screw Conveyor.

Grit Conveyor System for the Nacogdoches WWTP in Nacogdoches, TX - KWS

Zero Speed Sensor Can Sense the Shaftless Spiral Through Ceramic Liner.

Grit

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