Grit deposition in storage tanks, pump stations and sewage overflow basins is an ongoing issue for many councils and water authorities. High specific gravity particles that are not able to be pumped away using existing pumps can settle and accumulate to the point where storage capacities are seriously impaired. The revolutionary Vaughan Floor Washing (VFW) System by Vaughan Co. (USA) has been designed to address this issue.
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The new 17,000 m3 Digester 6 at Changi Water Reclamation Plant will be mixed using a custom Rotamix pump and nozzle mixing system.
With a diameter of 32 metres across, a sidewall height of 13.9 metres and a cone depth of 18.3 metres, Engineers working on the Digester 6 project at Changi WRP were presented with some unique challenges. One major consideration was selecting a sludge mixing system that would be capable of mixing such a large volume digester and deep cone floor. A Rotamix Process Mixing System was the answer.
Vaughan Company, Inc., the world’s leading chopper pump manufacturer for over 50 years have released a new heavy-duty, diesel engine driven, vacuum primed chopper pump for mobile solids handling applications. The unit is an adaption of the popular Vaughan model HE6W horizontal end suction chopper pump, designed for handling high concentrations of difficult suspended solids without clogging. With the aid of a robust venturi vacuum prime system, the unit allows for dry suction lifts up to 7.3 metres, flow rates up to 560 cubic metres per hour, and heads up to 40 metres. With the main pump wet end built to the same tried and trusted spec as regular Vaughan chopper pumps, including the heavy-duty bearing housing and “flushless” cartridge seal configuration, end users can be assured of the highest mechanical reliability in the toughest pumping applications. The pump unit has an 8″ suction flange and 6″ discharge and is powered by a top quality four cylinder, four cycle, turbocharged and water cooled John Deere 4045TF290 Interim Tier 4 diesel engine.
For full specifications and performance data, please click here.
Fairfield-Suisun Sewer District (FSSD) in California installed a Vaughan Rotamix® hydraulic mixing system next to an identical anaerobic digester with a 7-year-old gas mixing system. Rotamix® installation was completed in Sept, 2010. This opportunity allowed the District to directly compare Rotamix vs. gas mixing in their very well instrumented digesters, which handle predominantly primary and thickened waste activated sludge. The digesters are identical 95 ft (29m) dia, 1.76 million gallons (6613 m3) conical floor units.
Vaughan Rotamix will solve many of the traditional problems associated with mixing storage lagoons at local authority and industrial wastewater treatment plants as no moving parts are installed in the lagoon. Submersible mixers and floating shaft driven mixers have electric cables and moving parts in the wastewater, which can be prone to problems of fine fibres and rags reweaving and wrapping around moving parts, shafts and cables. If an electric motor fails for any reason, this will require the complete mixer to be removed, which in turn will affect the operational aspects of the lagoon.