Ovivo’s EWT rotary distributor is designed to evenly distribute sewage over a trickling filter. The EWT rotary distributor mechanisms have been developed using Ovivo engineers’ extensive experience and application of conventional units. These units’ design features help to provide years of trouble-free service.
Rotating Center Assembly
Supports the unit and rotates the arms
Upper Bearing Assembly
Supported by the center assembly spherical thrust roller type
Stabilizing Bearing Assembly
Provides stability for the rotating mechanism bronze brush type (split)
Two Center Assembly Designs
Rectangular Flow Baffles
Used for flows varying in ratios of 2:1 to 5:1 or more, and when secondary arms are needed. When flow to the primary arms reaches a predetermined amount, excess flow spills over the baffle and is fed into the secondary arms. This design functions under a much higher flow ratio and with less head.
Open Center Well
Used when the flow variation range is low (2:1 ratio or less between minimum and maximum flows), or where it is not necessary to operate on the lowest possible head.
There are several arm types: single or double compartment, rectangular steel plate or circular pipe. The type of arm used is determined by the diameter of the filter, the influent flow and available head.
Spreaders and Orifice Plates
These are for use with rectangular or circular arms. Spreaders on rectangular arms are much closer to the media surface than on circular arms, which require placing spreaders on the center line of the pipe. Head requirements are therefore lower with rectangular arms than with circular arms. Flow is uniformly distributed over the entire surface or the media with either design.
Hardened plastic (polyethylene), non-corrosive spreaders combine strength, durability and non-clogging properties for unrestricted flows. Ease of installation reduces costs and adds flexibility to orifice settings. Spreaders can also be constructed from brass, aluminium and stainless steel.