Ovivo® Submerged Effluent Launder

The Ovivo® Submerged Effluent Launder uses a simple, innovative design to harness the natural light-deflection properties of surface water by restricting the light algae need to grow providing an effective and sustainable solution to algae growth. The 5-in-1 design replaces the need to operate and maintain multiple components traditionally used to control algae including launder covers, brush or spray algae control system, and weirs and scum baffles. Minimizing equipment and maintenance costs, by providing reliable and efficient algae growth control and prevention. The 5-in-1 design offers five functions in one piece of equipment: 1) Launder 2) Weir 3) Scum Baffle 4) Density Current Baffle 5) Launder Cover

The Ovivo® Submerged Effluent Launder (SEL) eliminates algae growth. The SEL is ideal for new and retrofit wastewater treatment plants looking for a cost-effective, low-maintenance solution to control clarifier algae growth.

How does it work?

Light is the most limiting factor for algal growth, followed by nitrogen and phosphorus. Algae need long and uninterrupted periods of lighting to function properly. Therefore, intensity and duration of light exposure is critical to algae growth.

Ovivo developed a simple and sturdy design that utilizes natural light-deflecting properties of surface water to create a 50% reduction in light intensity at 20 inches below the water surface. Design parameters set orifices on the SEL at or below 18” beneath the water surface. This design allows just enough reduction in light intensity to significantly minimize or eliminate algae growth.

This simple, innovative design is ideal for new and retrofit wastewater treatment plants looking for a cost-effective, low-maintenance solution to control clarifier algae growth.

Minimizes equipment and maintenance costs, by providing a single piece of equipment that performs many functions and eliminates algae growth.

  • Simple 5-in-1 design eliminates algae growth without needing to buy multiple parts
  • Eliminates need for launder covers or algae sweep systems
  • Eliminates weir and scum baffle
  • Eliminates need for operator to manually clean effluent launders and potential safety issues
  • Minimizes or eliminates algae growth
  • Eliminates the need to form concrete effluent launders on new tanks
  • Install fewer components, using fewer anchors and fasteners

One component serves as five functions:

  • Launder
  • Weir
  • Scum Baffle
  • Density Current Baffle
  • Launder Cover

It is comprised of an upper launder plate and a lower launder plate.

The upper launder plate comprises three sections that serve five functions.  The upper section is a vertical plate that functions as a scum baffle and as a connection point to the clarifier tank wall.  The middle section, integral to the upper and lower section and angled downwardly and obliquely, functions as the upper boundary of the submerged launder.  In addition, orifices are located near the bottom of the middle section to collect clarifier effluent.  Orifices are significantly submerged to minimize sunlight to prevent algae growth serving the function of a launder cover.  The lower section is integral to the upper and middle section and angled downwardly and obliquely, extending below the lower launder plate serving as a density current baffle.

The lower launder section serves as the bottom boundary of the submerged launder.  It is anchored to the clarifier tank wall and is fastened to the upper launder section above the density current baffle section and below the orifices.

The submerged effluent launder must not exceed the following design parameters:

  • Maximum head loss of 12 inches through the submerged effluent launder system
  • Maximum launder velocity of 4 fps
  • Maximum orifice velocity of 5 fps

Using the OVIVO’s proprietary sizing program, the following values will be calculated:

  • Orifice diameter, depth and spacing
  • Total number of orifices
  • Upper launder plate angle of projection from horizontal plane
  • Length of density current plate
  • Head loss
  • Maximum launder velocity
  • Maximum orifice velocity
  • Flowrate at each orifice to illustrate that flow rate is distributed evenly to each orifice with a standard deviation of ±5%

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