- Home
- Companies
- WTP Equipment Corp.
- Products
- WTP Vortex - Automatic Grit Removal ...
WTP Vortex - Automatic Grit Removal System
VORTEX GRIT REMOVAL: Automatic grit removal from continuous wastewater flows in a low footprint shop-fabricated package plant or for a concrete tank installation. Grit is settled, concentrated, washed of organics, and dewatered producing a dried and cleaned product of reduced volume and odor. Grit is pumped from the vortex grit collecting chamber by an air-lift pump, a recessed impeller grit pump or a self-priming grit pump to a final stage grit classifier.
Vortex Grit Chambers
A circular, continuous flow-through vortex grit settling chamber, sized according to plant peak flow rate, is used as the system primary wastewater grit separation stage. The compact chamber is suitable for confined space applications and is available in fabricated steel or stainless steel tankage or for concrete installations. The chamber consists of an upper separation tank, where grit is removed from the flow, and a lower tank which stores settled grit between extraction cycles and is provided with water and/or air scour systems to clean and fluidize grit prior to pumping out. Excellent grit removal performance is achieved at minimal headloss and independent of flow rate variation.
Vortex Agitator
Within the vortex grit separation tank a slow speed mechanically driven agitator regulates the internal vortex action to ensure that, while grit settles to the storage tank floor, organics are maintained in suspension and carried out with the de-gritted flow. The vortex agitator is driven by a geared motor located on the vortex grit chamber bridge for ease of access.
Grit Pumping
Grit is automatically removed from the vortex grit chamber storage tank on a timed basis. Grit may be pumped by either of three methods offered by WTP Equipment Corp.:
- an air lift pump, which is driven by an external blower,
- a recessed impeller type grit pump located in a dry well; or
- by a self-priming grit pump located at the tank top.
Grit Washing
Air and/or water scour fluidizes the grit into a slurry within the storage tank prior to grit pumping and washes out any remaining organics. The washed grit slurry is fed through a separator cyclone to an external grit classifier for final stage processing where it is further concentrated and dewatered prior to discharge for easier and less expensive off-site disposal.
Control System
The entire process is controlled by a dedicated, stand-alone control system to provide automatic (timed) and/or manual grit removal operation: agitator rotation; opening and closing of control valves; air / water scour operation; grit pump and grit classifier duty cycles.