Aeration & Mixing Systems Brochure

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1. AERATION MIXING SYSTEMS Maintenance-Free, Non-Clogging Systems ®

4. AERATION MIXING SYSTEMS Maintenance-Free, Non-Clogging Systems Channel Aeration & Mixing Systems Channel Mixing Assemblies ® Common channels in wastewater treatment facilities service multiple tanks and once put into service are impractical to drain and access equipment. These channels are susceptible to solids accumulation as the linear velocities are typically very low. The residence time in these channels can also be extended to the point where the process wastewater transitions to an anoxic state. Wastewater pump station wetwells can utilize periodic mixing and oxygen supply. These modular assemblies can be applied in wetwells to break up the floatables (oil and grease) and the settled solids near the pump inlet. Often these systems are operated prior to the transfer pumps coming on-line. Wetwell Mixing Channel aeration and mixing addresses these two issues. Solids are re-suspended by the mixing loops and the residual dissolved oxygen is increased for aerobic conditions. The Tideflex ® channel assemblies are designed for lift-out removal when the channels are full of water and re-insertion into the channel after inspections. The lower wall brackets act as cradles to receive and hold the horizontal distribution pipes. The systems are most often fabricated from schedule 10 stainless steel piping either 304L or 316L. The joint connections are all roll groove type using Victaulic ® rigid couplings for easy field assembly. These assemblies are available in various modular lengths for the horizontal manifold section.

7. RedValve Valve Selection Guide for Wastewater Treatment Valve Selection Guide for Wastewater Treatment ® TIDEFLEX ® MULTI-PORT MIXING SYSTEMS FOUR High Performance Mixing Systems ® “Rely on Red” for a Total System Solution to Your Water and Wastewater Treatment Challenges No other company can match Red Valve’s “Total System Solution” for water and wastewater treatment plants and municipal collection and distribution systems. Since 1953, Red Valve has provided products for each phase of collection, distribution, separation, aeration, treatment and final discharge. Our complete product line provides customers with one source for on/off and control valves, check valves, pressure measurement, expansion compensation, air diffusers and effluent diffusers. All Red Valve products are designed to handle the rigors of handling raw sewage, sludge, scum and grit with abrasion- resistant, non-clogging designs. Contact us today for a free copy of our new Tideflex ® Mixing Systems brochure or our comprehensive Valve Selection Guide for Wastewater Treatment. US Patent No. 6,016,839 / 6,193,220 / 6,372,140 / 6,702,263 Canada Patent No. 2,366,252 / 2,385,902; United Kingdom No. 2,326,603 © 2017 Red Valve Company All rights reserved.

3. The Tideflex ® Aeration Mixing system is a sealed system preventing the surrounding wastewater and solids from entering into the diffusers and manifold piping. This provides the capability to cycle the blower on and off as the process requires. For sludge storage processes, this allows for decanting and thickening of the storage residuals as well as denitrification. Most Tideflex ® alternating systems reduce blower operating costs by at least 35%. These Tideflex ® systems are preferred in high solids applications where the clogging potential is significantly increased. Wastewater treatment sludge applications range from 1% to 5% solids and water treatment alum sludge applications from 5% to 9% solids. The Tideflex ® system is the only air mixing system rated for these high solids applications, while at the same time providing maintenance-free operation. The Tideflex ® Mixing system can be applied in anoxic process zones utilizing the ON/OFF operational mode. Most anoxic zones only require periodic mixing of the bio- floc. The Tideflex ® system can achieve complete mix within about one minute of operation. This short operational period results in very little oxygen transfer; these anoxic processes are in a negative ORP state where the presence of this low oxygen residual has little effect on the ORP state. AERATION MIXING SYSTEMS Maintenance-Free, Non-Clogging Systems High Solids Residuals Management: Aerobic Digesters and Sludge Holding Tanks ON/OFF Blower Operational Mode Tideflex ® Aeration Mixing System manifolds are most often constructed of all stainless steel materials. All connections are either flanged, roll grooved and coupled, or threaded. The thermal expansion couplings and rigid joint couplings are Victaulic® brand 316SS with silicone gaskets for heat control. The system piping is anchored to concrete foundations with threaded rods and Hilti ® epoxy adhesives. For steel tank floors, base plates are provided for anchoring. These systems can be operated as a biological selector using ON/ OFF aeration and mixing. Utilizing ORP Control (Oxygen Reduction Potential), these systems can be operated at 70% less applied airflow. System Assembly Components Biological Selector Capability ®

5. AERATION MIXING SYSTEMS Maintenance-Free, Non-Clogging Systems Aerated Grit Tank Mixing Systems Tideflex ® Engineers have partnered with several consulting engineering firms in conducting CFD modeling of existing structures as well as optimized enhancements. This has allowed Tideflex ® to develop new design standards and guidelines for grit tank optimization. These guidelines include mixing zone quantities, energy rates, baffle locations, diffuser locations, and inlet channel configurations.Tideflex ® engineers provide the mixing assemblies, throttling valves, support brackets, anchors and diffuser assemblies. Contact Tideflex ® Engineering today for an evaluation of your existing or new aerated grit tank system for enhancement using the newest technology. New Design Standards for Aerated Grit Optimizing Existing and New Grit Tank Geometries ® Aerated grit tank designs have been utilized for the last 100 years, but have never been validated in terms of performance optimization. With the availability of computerized evaluations, primarily computation fluid dynamics (CFD) programs, these older designs have been evaluated for enhancement of performance. Tideflex® has incorporated these enhancements into their system designs and recommendations, resulting in performance increases of at least 20%. Tideflex ® Engineers will determine the quantity of mixing zones required within the process. An evaluation should be performed for optimal operation to address storm surge capacity system needs. Grit removal systems should also provide a means for washing the biomass from the grit. This is achieved in the high- rate mixing zones at the beginning of the process. The mixing zone’s energy requirements are decreased longitudinally through the grit tank for removal of various particle diameters. The Tideflex ® mixing assemblies provide excellent zone mixing. Each assembly has a flow regulator valve to control the mixing loop velocity. Maintenance periods and downtime for aerated grit tanks typically result in temporary accumulation of grit within the tank, to the point where the grit blanket covers the diffusers. Plastic type diffusers fail in these loading conditions. Tideflex ® diffusers are extremely durable and withstand these conditions without disruption or downtime.

6. Mixing systems are required in most storage tanks to re-suspend the accumulated solids as well as provide some residual dissolved oxygen to keep the fluid from going anaerobic. These mixing systems must be durable and dependable as they can sit idle for long periods and then require immediate operation during a storm event. Tideflex ® Systems have been installed in all tank construction variations; concrete tanks, bolted steel tanks, and lined lagoons. AERATION MIXING SYSTEMS Maintenance-Free, Non-Clogging Systems Stormwater Containment, Mixing & Aeration Highly Durable, Maintenance-Free Systems Regulations for stormwater containment, testing and treatment are currently being implemented. Storage is required to capture the initial run-off and test for treatment requirements. This stormwater can contain accumulated pollutants and debris, requiring mixing systems in these storage tanks to re-suspend the accumulated solids, as well as provide residual dissolved oxygen to keep the fluid from going anaerobic. Stormwater Management Equalization tank mixing systems are very similar to the design and operation of stormwater containment systems. They can be operated in a variable volume mode where the mixing system provides solids suspension and residual dissolved oxygen adequate to keep the process fluid aerobic. If an anoxic process follows to the equalization tank, then a hydraulic mixing and recirculation system should be considered. Refer to the Tideflex ® HRMS Mixing System. Equalization Tank Mixing Concrete Tank Structures Fabricated Tanks Buried Tank Structures Lagoon Structures ® The Tideflex ® Coarse Bubble Mixing System with EPDM nozzles is very durable and can be fully exposed to weather conditions (open lagoon structures) or contained within a buried storage vault. The nozzles are non-clogging devices, making the system maintenance-free, with no need for regimented service. They are ideal for these applications that are typically located away from the primary wastewater treatment facility and its operational staff. The Tideflex ® systems can be operated in an ON/OFF mode for periodic mixing as required to significantly reduce energy usage. The check valve diffusers prevent waste and debris from entering the manifold piping and provide a maintenance- free system. The Tideflex ® design models produce the most efficient configuration of piping and diffusers for optimizing controlled loop mixing and fluid momentum. Controlled loop mixing provides better mixing of heavy solids as compared to full floor coverage configurations.

2. Check Valve Diffusers: How the Tideflex ® Aeration Mixing System Works The Tideflex ® Combination Aeration and Mixing system allows for ON/OFF blower operation for nutrient removal processes, decanting processes, biological selectors and general power savings. Automatic Closure and Positive Seal The Tideflex ® Model TFA-3.00 Coarse Bubble Diffuser contains two thin gauge stainless steel plates, which are embedded on both sides of the flat “bill” closure area. When the diffuser is operating (flowing open), the internal closure plates become energized. Due to bending curvature, the plates will force the bill area closed when flow is discontinued. This feature is significant when operating in fluids of 1% solids or greater. Available Elastomers The Tideflex ® compression molded diffusers are available in several elastomers including EPDM, NEOPRENE BUNA-N and PGR. For municipal wastewater applications, EPDM is most often applied for it’s high resistance to acids and ultraviolet radiation. This EPDM compound contains less than 10% leachable oils, therefore it will maintain its elasticity for years of operation. Tideflex ® Mixing Systems are also used in industrial mixing applications where the fluid characteristics can vary significantly. More than 50 years ago, Red Valve Company developed the Tideflex ® duckbill check valve. This fabric-reinforced elastomer valve allows flow in one direction only and seals closed when the external hydrostatic pressure exceeds the internal pipe pressure. With diffused aeration systems, preventing the wastewater and biomass from entering into the air distribution system is critical to ensuring continual operation of the mixing system and the elimination of solids build-up and clogging inside the pipeline. AERATION MIXING SYSTEMS Maintenance-Free, Non-Clogging Systems The Tideflex ® Check Valve Air Diffuser Blower ON - Gas travels vertically due to buoyancy. Fluid is educted into vertical flow path . Diffuser tip is located 3” to 4” off the floor. Blower OFF - Hydrostatic pressure on external sides of diffuser forces a “sealed” close. The Tideflex ® Check Valve Air Diffuser is a proprietary compression molded Tideflex ® unit. The two most important performance features of the Tideflex ® System are 1) backflow prevention at the diffuser and 2) air discharge location within a few inches from the floor. These features allow the system to be operated in an ON/OFF blower mode for nutrient removal and also provide significant energy savings. Near-Floor Discharge During blower operation, the Tideflex ® Check Valve discharges air at near-floor elevation for complete vertical mixing. The benefit of the Tideflex ® Diffuser is the prevention of sludge build-up in the bottom of the tank, eliminating backflow of the process fluid into the upstream internal pipe. Open pore style diffusers have no backflow prevention. Pipes fill with sludge when thte blower is off. ®

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