Water / Wastewater Treatment
Sludge Buildup and Aerator Blockage Solved
The District of Kitimat, British Columbia, a pristine coastal community with 10,000 residents, is located at the head of the Douglas Channel and the Kitimat River. The area is a major salmon spawning corridor, supporting a large sports fishing industry. For both ecological and economic reasons, any facility discharging wastewater into the river must be mindful of strict discharge regulations. No one is more aware of this than the management of the Kitimat Wastewater Treatment Plant.
Recently, the plant, which treats 2.6MGD and handles peak flows of 7.3 MGD, was faced with an emergency upgrade. A barminutor, installed in the 1970’s as a bar screen and grinder, had rusted and developed holes, allowing rags, wood, rocks and other debris to pass through unimpeded. The debris not
only caused blockages and clogs in the aerators but also contributed to the build up of sludge in the lagoon. The facility’s management was determined to install a more efficient system and end the chronic problems. After carefully reviewing their options, they chose the Dimminutor® Channel Disintegrator from Franklin Miller (USA).
Turbo Design “We originally planned to buy one Dimminutor® , “said Wayne Sussbauer, Technical Services
Manager. “The size of the unit was important because we needed to be sure it could handle peak flows and not require a head differential that would cause the upstream chanel to overflow back into the wet well and subsequently untreated effluent into the river. Based on assessment, we decided that two units would do a better job of meeting peak flows and minimizing the probability of an overflow.” The Dimminutor®
comminutors were placed side by side in two existing channels. “With the supplied frames they were easily installed into the existing headworks units,” commented Sussbauer.“ This was a consideration in the purchase.”
In Kitimat, effluent flows by gravity to a wet well. It is then pumped up by three screw pumps into the headworks where the two Dimminutor®
units has made a noticeable difference. comminutors are located. All the wastewater solids
are finely ground before entering an aerated lagoon. The treated effluent is then discharged into the river. According to Sussbauer, installation of the Dimminutor®
“They play a key role in protecting the aerators from clogging, reducing the need for maintenance and enhancing the treatment process.”
offers effective, automatic screening and disintegrating of wastewater solids in straight through channels and wet wells. This powerful unit reduces plastics, wood, rags and other solids to fine bits, improving the reliability of pumps and other downstream equipment.
The Dimminutor® The unit employs a smooth, continuously rotating design with high torque. As its three
bi-directional rotary cutters intermesh at close clearance with stationary cutters, solids are finely reduced to a size small enough to pass through a sizing screen. With no gaps or openings between the screen and cutters, output is controlled and complete reduction assured.
has an intrinsically open design to handle high flow rates with low head-loss. This unit is extremely easy to maintain and features individually replaceable cutters, oil lubrication and a simple rotary design requiring no auxiliary diverter screens. A unique, cantilevered design eliminates seals or bearings near the gritty channel floor. Every component of the unit is constructed for precision and long life.
The Dimminutor® Reader Reply Card No 33
Radar Level Transmitters Now Available with WHG Overfill Protection Approval
Emerson Process Management (UK) announces that its Rosemount® 5300 Guided
Wave Radar (GWR) and 5400 Non-Contacting Radar level transmitters are now available with approvals to the German Federal Water Act (WHG) regulations for overfill protection. Companies in the oil & gas production, refining, petrochemical, chemical, power industries and water and waste, will now benefit from the superior performance of Rosemount radar technology, while ensuring compliance with WHG overfill and water protection requirements.
The transmitters successfully passed the third-party test by TÜV (Technische Überwachungsverein), the German testing authority responsible for testing overfill protection equipment according to requirements of the German WHG regulations. Proven instrument accuracy and reliability are key factors in the overfill protection approval process and the Rosemount radar devices were required to pass the comprehensive test of 5000 overfill situations for each transmitter, over the whole temperature range.
The Rosemount 5300 and 5400 Series are high performance 2-wire radar transmitters for challenging level and interface measurements on liquids, slurries and solids. The products take advantage of the company’s 30 years of proven radar expertise and are designed to improve plant profitability through superior reliability, state-of-the-art safety features, effortless handling and unlimited connectivity.
In both the Rosemount 5300 and 5400 Series, the analogue output which
provides a continuous level measurement, can also be used to trigger an overfill alarm. The analogue signal is read by the control system which activates an alarm when a predetermined level is exceeded. In addition, the transmitters have an alarm function that indicates if the device has failed.
Innovations such as Direct Switch Technology (DST) for GWR and Dual Port Technology for non-contacting radar, make the Rosemount 5300 and 5400 Series the most reliable radar transmitters available. DST enhances the capabilities of the GWR to handle disturbances, longer measuring range and lower dielectrics, even with the single probe design. The Dual Port Technology built into the 5400 Series, enables a stronger signal than other 2-wire radar transmitters, providing better measurement reliability.
The robust designs prevent leakage and ensure reliable performance even under extreme process conditions. Heavy-duty probes are available to meet the extreme temperatures and pressure challenges with multiple layers of protection and advanced echo logics for reliable overfill detection. The 2-wire technology means that installation is fast and inexpensive.
The user-friendly graphical interfaces with wizards, measure-and-learn functionality, suggestions for application specific configuration and
PlantWeb™ functionality, ensures that the transmitter integrates easily into new or existing control systems. Together with maintenance-free operation and advanced diagnostics, the result is a quicker return on investment with overall improved uptime and enhanced safety.
Reader Reply Card No 34
The 60 CKX model pump from Ruhrpumpen (Germany) features 3 stages, 43,000 GPM/460 ft TDH with a 6100 HP/4000 volt/590 RPM motor, and is undoubtedly one of the largest vertical multistage pumps ever built in North and South America.
The customer, North Texas Municipal Water District, witnessed the test which ran very smoothly due to Ruhrpumpen’s extensive experience manufacturing this type of pump, and centrifugal pumps in general.
Testing was conducted at the Ruhrpumpen test lab in
Monterrey, Mexico. Enhancements are planned for the near future to further increase testing capabilities.
Reader Reply Card No 35
Multistage Vertical Pump
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www.pollutionsolutions-online.com • February / March 2011
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