The WesTech solids CONTACT CLARIFIER™ combines mixing, internal solids recirculation, gentle flocculation and gravity sedimentation in a single unit.  Influent flow is mixed with previously settled solids within the draft tube.   Gentle mixing within the reaction well promotes growth of floc particles and/on chemical precipitates.  Gravity sedimentation occurs in the clarification zone and clarified overflow is removed through a radial launder system.  Rotating sludge scrapers transport settled solids to the center of the basin for removal.  

Primarily for lime and soda ash softening, and surface water clarification, additional applications for the clarifier are phosphorus removal, heavy metal removal, adsorption on PAC and SiO2 removal, fluoride removal, and scrubber water treatment.  These units are also used for pre-treatment to membrane filtration systems.

The recirculation impeller is the “Heart” of the Solids CONTACT CLARIFIER™.  WesTech’s radial impeller is located at the top of the draft tube and is designed with swept back blades to minimize shearing of floc particles and horsepower required.  WesTech’s Solids CONTACT CLARIFIER ™ is available in both center pier and bridge supported configurations, circular or square basins, and concrete or steel tanks.  Cylindrical or conical reaction wells are designed for specific applications.

WesTech has designed and installed hundreds of CONTACT CLARIFIERS™ utilized in many applications. This experience is employed in the supply of each new unit.  Services are available to assist in erection and commissioning.

ADVANTAGES 
 Combined Treatment Unit
• Low energy mixing for chemical reactions and formation of floc particles
• Gravity sedimentation clarification and suspended contact precipitation are achieved in tank. This represents a considerable savings over conventional process trains in required tankage, civil work, and ongoing operational costs.

Small Footprint
• More efficient inlet mixing with high concentrated recycle requiring less space than a similarly sized  conventional flocculation/sedimentation train

Low Shear Impeller
• Radial impeller with swept back blades provides high volume recirculation with low floc shear. This advanced design also results in lower horsepower requirements.

Dual Precision Gear Drive Unit
• Utilizes the WesTech heavy duty concentric dual drive, available in both grease and oil lubricated models. The WesTech drive is a proven workhorse of the industry, and employs trouble-free cycloidal gear reduction for clean, efficient in-line power transfer directly to the precision gear bearings.