The Graver lamella configuration ensures laminar flow conditions, which results in hydraulic uniformity and high effluent quality. It permits great reduction in the space needed for clarification equipment and allows the compact equipment to be located indoors if desired, or to be easily relocated at a later date. It also makes point-source treatment not only feasible, but logical for many applications.

Advantages of the Graver Lamella Clarifier:

Flow Entry:

In the Graver lamella clarifier, flow enters form both sides of the lamella plate. This allows the feed flow to be equally proportioned, directed and distributed to all settling surfaces without impeding the movement of solids already settled.

Removable Plates:

Individual plates in the Graver lamella are easily removable, even when the unit is in operation. This design permits a single operator to easily inspect or remove plates without the assistance of mechanical lifting devices, making the unit easier to inspect and maintain than competitive designs. This feature also offers the flexibility needed to handle variations in influent characteristics.

Wier Take Off:

A weir plate with custom-sized orfice holes is used to provide more effective collection designs. The orifices are positioned so that each compartmnet bounded by a pair of plates is serviced by an oricace on each side. This results in more efficient hydraulic conditions and thus higher effluent quality.

Hopper Arrangement:

Several options are available for sludge storage. The standard arrangement is a four sided, inverted pyramid, hopper bottom. A second option is to mount the lamella on top of a mechanical thickener in order to achieve a higher solids concentration, while at the same time providing a large liquid sludge storage volume.

Construction Arrangements:

Graver lamellas are furnished as a package unit or built on-site of concrete construction. This allows application of the lamella clarifier design for flows of any range. Graver has built package units in many different materials. Included among them are stainless steel, fiberglass and carbon steel with linings to meet specific service requirements. Packaged units dramatically reduce field erection costs since almost every standard unit is shipped in one or two pieces.

Features and Options:

Standard Features:

• Structural steel support legs
• 1/4" minimum tank wall thickness
• Epoxy painted carbon steel tank
• Individually removable FRP plates
• Adjustable effluent weir plates
• Standard units can be manufactured for flows from 5 gpm to 3000 gpm and above, in a single above grade tank
• One-piece prefabrictaed units are available with up to 1000 square ft. of effective settling area.
• One-piece construction with integral flash mix/floc compartments for smaller units

Available Options:

• Flash mix/flocculation tanks with mixers
• Full FRP or stainless steel construction
• Concrete tank designs
• Special coatings and plate materials
• Integral mechanical sludge thickener
• Access platform and ladder
• In-house laboratory analysis for equipment optimization
• Potable water design
• Gasketed and removable covers
• Automatic desludging
• Instrumentation and controls
• Chemical feed equipment
• Sludge handling and dewatering
• Pilot size units for on-site testing

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Lamella Specification