Ovivo® Rotary Distributor

The Ovivo® rotary distributor filters screened and settled wastewater through a bed of rock or plastic to reduce the biological oxygen demand (BOD) to acceptable levels. Microorganisms attach to the media and consume the waste that contacts the surface as the liquid trickles through the media. Basic applications for rotary distributors include low and high rate trickling filter processes, but can be used for roughing, to reduce the organic load applied to subsequent biological processes.
  • Rotary DistributorHydraulic or Motor Driven Rotary Distributors
  • Uniform distribution of flow over the entire surface of the Trickling Filter bed
  • Upper Bearing and Stabilizer bearing are located above the liquid level
  • Variety of center assemblies available for standard or high rate applications in stainless, aluminum or steel materials
  • Rectangular or Circular distributor arms

Every Ovivo rotary distributor is tailored to individual operating conditions utilizing two or more distributor arms.

  • Design features of these units provide years of trouble-free service
  • Trouble-free service
  • Ease of maintenance

What is the difference between a hydraulic driven distributor and a speed controlled distributor?

Rotary distributors have historically used the reaction thrust of water flowing over spreader plates on the trailing edge of distributor arms to rotate the distribution mechanism forward. In order to slow the distributor down, a small number of spreader plates are placed on the leading edge of the distributor arms to provide a backward thrust. The spreader orifice openings are set based on what is required to achieve even distribution of the wastewaterover the filter media. Once the orifices are set, these are seldom adjusted unless major changes in flows occur. Most hydraulically driven or Reaction driven distributors rotate at 1 to 3 revolutions per minute (rpm) with wastewater dosed at 0.2 to 0.6 inches per pass of each distributor arm. In the early 90’s many Engineers recommended slowing down the speed of rotary distributors so that water would penetrate deeper into the filter tank with each pass. Speed controlled or Motor driven distributors allow for a controlled rate of distribution which is independent of the flow or orifice settings. Speed controlled distributors can be operated 10 to 20 times slower than hydraulic driven distributors while operating at the same flow.

What does dosing rate, Spülkraft and flushing rate mean?

The dosing rate and Spülkraft describe the same thing, dosing is given as inches/pass of a distributor am while Spülkraft is a German process term given as mm/pass. Both the dosing rate and Spülkraft are used to quantify the depth of water that is applied by a single arm of a distributor over the surface of the filter before the next arm passes. The flushing rate has the same units as dosing and Spülkraft but flushing is usually applied over a short duration (1 to 2 hour) and much higher application rates than normal to increase sloughing of a fixed film reactor.

Is it necessary to control distributor speed?

Ovivo has provided thousands of trickling filters that have operated successfully with Hydraulic/Reaction driven distributors with relatively high rpms. However there are fixed film reactors that have experienced plugging, excessive sloughing, odor and poor process performance that could be avoided with higher dosing and scheduled flushing. Speed control/Motorized mechanisms should be considered for applications where the wastewater has high solids/organic loadings, the trickling filter tank or Biotower is over 18-feet in height or downstream processes are sensitive to excessive sloughing.


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