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SURVEY AND EVALUATION OF POROUS POLYETHYLENE MEDIA FINE BUBBLE TUBE AND DISK AERATORS
Citation:
Houck, D. H. SURVEY AND EVALUATION OF POROUS POLYETHYLENE MEDIA FINE BUBBLE TUBE AND DISK AERATORS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-94/104 (NTIS 94-200920), 1994.
Impact/Purpose:
Information.
Description:
Historically, while alternative media materials have been employed over the years with varying degrees of success, the principal fine pore diffuser medium has been porous ceramic. In the early-to-mid-1970s, diffusers with plastic porus media were installed in secondary treatment plants in Europe, primarily in Finland and Sweden. In order to document operation and maintenance experience with porous plastic media diffusers, plants in Europe were visited to observe and report on their experiences. This report discusses these observations and reviews on-site, long-term operating and maintenance information. The conclusions, in general, were that plastic porous media diffusers were performing satisfactorily. It was also concluded that the use of ferrous sulphate for coprecipitation was the most adverse fouling condition encountered by the porous plastic media systems. The most effective cleaning method for this type of fouling was found to be strong chemical treatment followed by an air/water backwash with specialized equipment. The effectiveness of similar cleaning for biofouling was inconclusive. The application and design of aeration basins with porous plastic media diffusers appeared to be similar to those for ceramic media diffusers. This report was submitted in partial fulfillment of Cooperative Agreement No. CR812167 by the American Society of Civil Engineers under subcontract to D.H. Houck Associates, Inc. under the partial sponsorship of the U.S. Environmental Protection Agency. The work reported herein was conducted over the period of 1986-1987. Project summary may be ordered as EPA/600/S-94/001).