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Optimization of Circular Plate Separators with Cross Flow for Removal of Oil Droplets and Solid Particles

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A circular gravity-phase separator using coalescing medium with cross flow was developed to remove oil and suspended solids from wastewaters. Coalescence medium in the form of inclined plates promotes rising of oil droplets through coalescence and settling of solid particles through coagulation. It exhibits 22.67% higher removal of total suspended solids (TSS) compared to separators without coalescing medium. Moreover, it removed more than 70% of oil compared to conventional American Petroleum Institute separators, which exhibit an average of 33% oil removal. The flowrate required to attain an effluent oil concentration of 10 mg/L (Qo10 ) at different influent oil concentrations (Cio ) can be represented by Qo10 × 10−5  =  −0.0012Cio + 0.352. The flowrate required to attain an effluent TSS concentration of 50 mg/L (Qss50 ) at different influent TSS concentrations (Ciss ) can be represented by Qss50 × 10−5  =  1.0 × 106 Ciss −2.9576. The smallest removable solid particle size was 4.87 µm.

Keywords: circular separator; coalescence plates; cross flow; oil‐water‐solid separation

Document Type: Research Article


Publication date: 2012-04-01

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  • Water Environment Research (WER) is published monthly, including an annual Literature Review. A subscription to WER includes access to the latest content back to 1992, as well as access to fast track articles. An individual subscription is valid for 12 months from month of purchase.

    Water Environment Research� (WER�) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.

    Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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