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From Water and Wastewater.com Industry News
Growth in the region has lead to the planned expansion of the plant’s ATAD system. Midan Industries was contacted to provide additional Turborator(TM) aerators and mixers for the plant expansion. The Turborator mechanical self-aspirating aerator/mixer is widely used in the French Creek plant with several installed in the solids contact tanks and ATAD reactors. The additional units required for the expansion of the plant bring the total number of Turborator units installed to 12. The Turborator aerators for the ATAD process at the French Creek plant are controlled by temperature. As each reactor reaches its set point, Variable Frequency Drives slow the existing Turborator aerators down, reducing airflow. While this ability to reduce or increase the operating speed of the aerators maintains excellent control over reactor temperature, long periods of operating at reduced speeds can allow solids to begin settling in the reactors. Periodically, submersible mixers were needed to maintain solids in suspension. The plant called Midan Industries for a solution that would enable airflow from the new Turborator units to be controlled without reducing the mixing energy necessary to prevent solids from settling. Midan’s Aer-on-Demand aeration control system was installed in conjunction with the Turborator aerator/mixers to solve the problem. The Aer-on-Demand(TM) system mounts directly to the Turborator frame and is positioned above the rotating hollow shaft. On all Turborator units, air is drawn down the hollow shaft by the rotation of our patented radial flow impeller. The rotating speed of the impeller (rpm) controlled through a VFD, determines the volume of air drawn down the hollow shaft. The Aer-on-Demand works by restricting the volume of air entering the shaft resulting in a reduction of air supply to the process while allowing the speed of the shaft and impeller to remain constant. The two units were installed in the primary ATAD reactor for a three-month trial. The addition of the Aer-on-Demand to the two Turborator units purchased for this plant expansion surpassed the expectations of the French Creek Water Pollution Control Center. Future plans include adding additional Turborator / Aer-on-Demand units for upcoming expansions and to replace older units that cannot be adapted to utilize the new Aer-on-Demand system. For more information contact: Midan Industries Ltd. 5481 268th Street Langley, BC V4W3W1 Telephone: 604-856-8557 Fax: 604-856-6512 Email: info@turborator.com Website: http://www.turborator.com © Copyright 1998 - 2008 Water and Wastewater.com |
