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The Rotary Distributor of the FutureHydroDoc™ Rotary Distributors
The Achilles’ heel of traditional rotary distributors has been that the dosing rate, and food to the trickling filter, have been at the mercy of the hydraulic flow. Controlling the dosing rate of the trickling filter is the key feature of the HydroDoc. WesTech has successfully provided hundreds of distributors that offer these process advantages.
The HydroDoc turns the tremendous momentum and torquecontained in the rotary arms into a mechanical and operationaladvantage. No longer is there a need to add energy or speed control using a center drive unit. The HydroDoc simply uses the hydraulic energy already present in the trickling filter to control the speed of the distributor.
The HydroDoc features automatically adjusting gates which are pneumatically controlled and which close and open in equal proportion across the orifices on both sides of the distributor arms. A sensor on the center assembly transmits speed readings to the control box, which automatically adjuststhe speed to match the preset operational or flushing program. As flow to the trickling filter varies, the speed is maintained by automatically adjusting the gates over the orifices. Speeds are controlled and all the benefits associated with periodic media flushing are achieved through the HydroDoc system. The HydroDoc takes control of the trickling filter, achieving optimum performance.
HydroDoc™Distributor of the Future
Proven Process Benefits Include:• Improved Oxygenation
• Improved Nitrification
• Higher BOD Reduction
• Extended Media Life and Service
• Odor Reduction/Elimination
• Significant Snail and Filter Fly Reduction
The HydroDoc rotary distributor is an exciting, innovative design that makes trickling filters an excellent process choice for wastewater treatment plants.
We know that regulating the flow through a trickling filter assures the health of the biomass through the depth of the media. A daily flushing cycle cleans the media and flushes loose dead biomass, leaving an optimally reactive film on the media. These improvements are achieved by controlling the speed of the distributor using PLC controls.
HydroDoc™ AdvantagesHydroDoc Mechanical and Operational Benefits Include: • No extra energy is required to rotate distributor.
• Operation is maintained, even in power outages.
• The rotary distributor is driven hydraulically.
• No ice, wind or environment damage.
• Flow uninterrupted during maintenance (pumps are not shut down).
• The arms can be stopped with full flow.
• Gates automatically clean orifices of debris.
• Retrofit to existing distributors is easy.
WesTech Offers Additional Benefits to Plants that Have Installed the HydroDoc System: • Recommendation and evaluation of initial trickling filter setup and SK rates.
• Evaluation of the trickling filter performance (up to five times in the first five years).
• WesTech will provide updated operational and process information as it becomes available.
Advantages Over Other Control Systems:There are no associated mechanical drive problems or maintenance.
The spreader ports covered by the gates are less apt to become blocked because the valve gates wipe the ports periodically to move or clear any obstructions.
The HydroDoc maintains an optimal distributor speed. The arms will continue to rotate at low flows and will not over rotate at higher flows. If the control system fails, power is lost, or air is unavailable, the distributor will continue to rotate at a preset default speed. When the problem is fixed, the controller will automatically resume the programmed rotational speed.
HydroDoc is equipped with an “E-stop” push button that will automatically bring the arms to an immediate stop without turning off the flow. This feature benefits the safety and maintenance efforts of the operators. Without shutting off the water or pumps, maintenance personnel can go to the center assembly and conduct normal maintenance tasks.
The HydroDoc controls are preprogrammed to fully open and close the gates periodically to clear obstructions that might exist. If spreaders do plug, the controls will automatically compensate for the imbalance and keep the arms rotating at the programmed optimal speed.
Proper operation does not depend on establishing or maintaining neutral thrust on the arms.
Central Valley WRF - HydroDoc Performance
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To see the HydroDoc, visit WesTech’s website at www.westech-inc.com, or contact WesTech to discuss your project.
© WesTech Engineering, Inc. 2012
Represented by:
A Better Solution...WesTech’s 40 years of process engineering experience has included enhancing the performance of trickling filters. Controlling the speed of a rotary distributor and, in turn, controlling the performance of a trickling filter. Now a new innovation, the HydroDoc™ makes this process even easier to operate and maintain. The HydroDoc™ Rotary Distributor heralds the end of the cumbersome gearmotor drive for trickling filters.
According to Reed Fisher, Plant Manager at Central Valley Water Improvement District in Salt Lake City, Utah; “HydroDoc is a cleaner way to properly run a rotary distributor with a lot less maintenance. WesTech came up with a better mouse trap, the maintenance is wonderful!”
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