The January 1980 regulations governing sewage discharge from marine vessels as established by the Environmental Protection Agency and the U. S. Coast Guard require that the effluent contain less than 150 mg/l suspended solids and less than 200 fecal coliform bacteria/100 ml. One of the technologies under evaluation for meeting these requirements is ultrafiltration (UF). A 1-in. (2. 5-cm) dia noncellulosic tubular UF membrane system was evaluated with raw sewage as well as mixed wastes (raw sewage, laundry, shower, and galley wastewaters). Rejection of fecal coliform bacterial and suspended solids was determined. Overall membrane performance was established in terms of flux and rejection. In all tests, treatment of the raw sewage resulted in higher fluxes than for the mixed wastes. Higher temperatures were found to improve significantly membrane performance without compromising rejection. Several cleaning methods are discussed for improving membrane performance. A method for automating the cleaning cycle is described.
|Journal||American Society of Mechanical Engineers (Paper)|
|Issue number||77 -ENAS-57|
|State||Published - 1977|
ASJC Scopus subject areas
- Mechanical Engineering