The influence of colloids and fine particles on membrane performance


  1. Tremblay, A.Y.
  2. Veinot, D.E.
Corporate Authors
Ottawa Univ, Ottawa ONT (CAN) Dept of Chemical Engineering;Defence Research Establishment Atlantic, Dartmouth NS (CAN)
The influence of colloids and fine particles on the performance of ultrafiltration (UF) and microfiltration (MF) membranes in treating an oily wastewater mixture containing used oil was studied. The composition of this wastewater closely resembled that of wastewaters accumulating in a ship's bilge. Several membranes having molecular weight cut-offs (MWCO) spanning the full range of commercially available UF pore sizes were tested in thin channel cross-flow test cells. The size and distribution of particles present in this wastewater was determined from dynamic light scattering (DLS) measurements, direct observations of the cake layer at the surface of the membrane and the modeling of experimentally obtained flux decline curves. The DLS measurements indicate that the synthetic bilge water prepared from used oil contains a bimodal distribution with mean radii at 89 nm and 1,340 nm. Particles in the lower distribution had radii ranging from 70 to 100 nm while those in the larger distribution ranged from 900 to 2,200 nm. The results obtained from all three techniques were in excellent agreement. Permeate flux was found to be severely affected by the presence of the smaller particles as their dimension is precisely in the range that is the most difficult to reat by cross-flow membrane filtration. TRUNCATED
Bilge fluid;Bilge water;Membrane technology;Oil effluent;Microfiltration;Oily water;Ultrafiltration;Treatment system
Report Number
DREA-SR-2001-094-SES-IV-PAP-20 — Special Report
Date of publication
01 Oct 2001
Number of Pages
Hardcopy;Document Image stored on Optical Disk

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