Wastewater Treatment Lamella Clarifier for WWTP and Municipal Plants Our Wastewater Treatment Lamella Clarifier (Model LST-2) is a high-efficiency inclined plate sedimentation system engineered for WWTP (Wastewater Treatment Plant) applications in municipal and industrial settings. The compact lamella design multiplies the effective settling area within a minimal footprint, delivering reliable solid-liquid separation for primary, secondary and tertiary clarification stages.