EPA Science Inventory

CHARACTERIZATION OF CLEAN AND FOULED PERFORATED MEMBRANE DIFFUSERS

Citation:

Ewing, L. AND J. Kitzinger. CHARACTERIZATION OF CLEAN AND FOULED PERFORATED MEMBRANE DIFFUSERS. U.S. Environmental Protection Agency, Washington, D.C., EPA/600/R-94/108 (NTIS 94-200961), 1994.

Description:

Laboratory analyses were conducted on plasticized PVC perforated membrane tube diffusers after varying periods in service at two different municipal wastewater treatment facilities. One set of diffusers from Cedar Creek, NY, was in service for 26 months. The other set from the Green Bay Metropolitan Sewerage District facility was in service for approximately 47 months. Tests on the membranes included dynamic wet pressure (DWP), flow uniformity, weight, dimensions, tensile modulus of elasticity hardness, and standard oxygen transfer efficiency (SOTE). Results of this brief study indicate a significant increase in DWP and decrease in flow uniformity and SOTE after service. Following membrane cleaning, there was a nonrecoverable reduction in DWP below that of a new membrane; an increase in specific gravity, durometer hardness, and circumferential modulus of elasticity; and a decrease in weight, length, and strain at failure. These findings were in good agreement with other field tests performed with these diffusers. Project summary may be ordered as EPA/600/S-94/001).

Purpose/Objective:

Information.

URLs/Downloads:

NTISCONTACT.PDF   (PDF,NA pp, 8 KB,  about PDF)

Record Details:

Record Type: DOCUMENT (PUBLISHED REPORT/REPORT)
Start Date: 07/28/1994
Completion Date: 07/28/1994
Record Last Revised: 12/09/2008
Record Created: 12/08/2004
Record Released: 04/02/2005
OMB Category: Other
Record ID: 126978

Organization:

U.S. ENVIRONMENTAL PROTECTION AGENCY

OFFICE OF RESEARCH AND DEVELOPMENT

NATIONAL RISK MANAGEMENT RESEARCH LABORATORY

LAND REMEDIATION AND POLLUTION CONTROL DIVISION