High-Density Clarifier System for Surface Water Pre-Filtration with Sludge Recirculation and Inclined-Tube Clarification

The high-rate clarification process represents advanced sedimentation technology built upon principles of sludge coagulation, sludge recirculation, inclined-tube separation, and sludge thickening. Through optimized hydraulic and structural design, this system integrates solid-liquid separation and sludge thickening within a single treatment unit. Its specially engineered reaction and clarification zones make it particularly effective for reclaimed-water reuse applications and advanced wastewater treatment requiring stringent discharge standards.

• Drinking-water treatment: Clarification and/or softening of surface water
• Industrial water supply: Preparation of process water and industrial service water
• Municipal wastewater treatment: Primary clarification and/or advanced phosphorus removal
• Stormwater treatment: Collection, treatment, and reuse of stormwater

The high-rate clarifier operates through four distinct sections:

1. Coagulation zone
2. Flocculation zone
3. Pre-settling zone
4. Inclined-tube clarification zone

Treatment begins with coagulant addition to raw water, where controlled mixing ensures rapid and uniform dispersion. The water then progresses to the flocculation zone, where flocculant addition promotes particle collision and formation of larger, denser flocs for enhanced settling. The sedimentation section combines pre-settling for rapid removal of large flocs with inclined-tube clarification for capturing smaller particles. Finally, clarified effluent is collected via overflow troughs and discharged from the system.