Tampa, Florida/Daly City, California
New Aerators can buy you…
The high purity oxygen system at the Howard F. Curren Advanced Wastewater Treatment Plant in Tampa, Florida needed new aerators. The old units had exceeded their useful life and many were from a manufacturer that is no longer in business. There was also excess aeration tank capacity because of process modifications that have been made to the Curren plant since it was originally designed. And, finally, surface aeration equipment has become much more efficient since the original aerators were first installed. DWG ASSOCIATES, in conjunction with Hazen and Sawyer (New York, NY) evaluated myriad aeration tank scenarios to determine the least number of aeration trains with appropriate aerator sizes to wring the most value out of new, more efficient aeration equipment. Going forward Tampa will operate with fewer aeration trains on line while maintaining higher D. O. concentrations than the plant has in the past. This will all result in improved performance at less operating cost.
The high purity oxygen system at the Daly City, CA wastewater treatment plant also needed new aerators. Daly City has been operating for the last 40 years with surface aeration equipment that was considered obsolete 30 years ago. These now defunct surface aerator turbines (known originally as the UNOX Aerator) are constructed of fiberglass with multiple enclosed, mixed liquor pumping channels per turbine. Needless to say, channel clogging with the commensurate loss of mass transfer and mixing has caused plant operating problems for a number of years. DWG ASSOCIATES, again in conjunction with Hazen and Sawyer designed new, high efficiency surface aeration equipment that will allow the plant to operate with much improved mass transfer efficiency (and higher D.O. concentrations) and no increase in power consumption. Added benefits will be no clogging as well as technical support from a major U.S. surface aerator manufacturer.