Advanced SearchSearch Tips
Effects of Co-current and Cross Flows on Circular Enhanced Gravity Plate Separator Efficiencies
facebook(new window)  Pirnt(new window) E-mail(new window) Excel Download
  • Journal title : Environmental Engineering Research
  • Volume 19, Issue 2,  2014, pp.151-155
  • Publisher : Korean Society of Environmental Engineering
  • DOI : 10.4491/eer.2014.19.2.151
 Title & Authors
Effects of Co-current and Cross Flows on Circular Enhanced Gravity Plate Separator Efficiencies
Ngu, Lock Hei; Law, Puong Ling; Wong, Kien Kuok;
  PDF(new window)
This study compares the effects of flow on oil and suspended solids removal efficiencies in circular enhanced gravity plate separator equipped with coalescence medium. Coalescence medium acts to capture rising oil droplets and settling solid particles and assist in the coalescence of oil and coagulation of solid. The circular separator uses an upflow center-feed perforated-pipe distributor as the inlet. The co-current flow is achieved using 4 increasing sizes of frustum, whereas cross flow uses inclined coalescence plates running along the radius of the separator. The different arrangement gave the cross flow separator a higher coalescence plan area per operational volume, minimal and constant travelling distance for the oil droplets and particles, lower retention time, and higher operational flowrate. The cross flow separator exhibited 6.04% and 13.16% higher oil and total suspended solids removal efficiencies as compared to co-current flow.
Circular enhanced gravity plate separator;Coalescence medium;Co-current flow;Cross flow;Oil droplets and solid particles removal;
 Cited by
Removal efficiency of storm water treatment techniques: standardized full scale laboratory testing, Urban Water Journal, 2017, 14, 3, 255  crossref(new windwow)
Application experiment and numerical simulation analysis of oil–water separator with two-oriented corrugated coalescence plate, Journal of Dispersion Science and Technology, 2017, 38, 10, 1509  crossref(new windwow)
Mohr KS. An overview of US and international regulations regarding hydrocarbons in water effluents. Proceedings of the Water Environment Federation and Purdue University Industrial Wastes Technical Conference; 2000 May 21-24; St. Louis, MO. p. 158-166.

LaRusic A, Mohr KS. Design and installation of a hydrocarbon removal separator for industrial storm runoff. Proceedings of the British Columbia Water and Waste Association Annual Conference; 1998 Apr; Whistler, BC.

Malaysia Department of Environment. Malaysia environmental quality report 2011. Kuala Lumpur: Department of Environment; 2011.

Tchobanoglous G, Burton FL, Stensel HD. Wastewater engineering: treatment and reuse. 4th ed. New York: McGraw-Hill; 2004.

Mohr KS. Stormwater treatment for contaminant removal. In: Public works and the human environment: proceedings of the International Symposium of the American Public Works Association; 1995 Apr 19-21; Seattle, WA.

Schlegel S, Stein A. Design measures to increase the efficiency of secondary sedimentation tanks. Water Sci. Technol. 2000;41:209-215.

Ngu LH. Development and performance test of a separation system for removal of physically emulsified and free oils from wastewater [dissertation]. Kota Samarahan: Universiti Malaysia Sarawak; 2004.

Meon W, Rommel W, Blass E. Plate separators for dispersed liquid-liquid systems: hydrodynamic coalescence model. Chem. Eng. Sci. 1993;48:159-168. crossref(new window)

Rommel W, Blass E, Meon W. Plate separators for dispersed liquid-liquid systems: multiphase flow, droplet coalescence, separation performance and design. Chem. Eng. Sci. 1992;47:555-564. crossref(new window)

Rommel W, Blass E, Meon W. Plate separators for dispersed liquid-liquid systems: the role of partial coalescence. Chem. Eng. Sci. 1993;48:1735-1743. crossref(new window)

Ngu LH. Development and optimization of a circular phase separator with dual angle coalescence plates for removal of suspended solids, free and physically emulsified oils [dissertation]. Kota Samarahan: Universiti Malaysia Sarawak; 2008.

Ngu LH, Law PL, Wong KK. A study on flow characteristics of a vertical perforated-pipe distributor in a circular separator. J. Civil Eng. (IEB) 2004;32:121-132.

Demir A. Determination of settling efficiency and optimum plate angle for plated settling tanks. Water Res. 1995;29:611-616. crossref(new window)

Law PL, Ngu LH, Wong KK, Yusof AA. Development and performance tests of a separator for removal of physically emulsified and free oils from wastewaters. J. Inst. Eng. Malaysia 2006;67:10-19.

Deininger A, Gunthert FW, Wilderer PA. The influence of currents on circular secondary clarifier performance and design. Water Sci. Technol. 1996;34:405-412. crossref(new window)

Ngu LH, Law PL, Wong KK, Yusof AA. Oil droplets and solid particles removal using circular separator with inclined coalescence mediums: comparison between co-current and counter-current flow. Water Sci. Technol. 2010;65:1129-1135.

Ngu LH, Wong KK, Law PL. Optimization of circular plate separators with cross flow for removal of oil droplets and solid particles. Water Environ. Res. 2012;84:299-304.

Ghani AA, Zakaria NA, Kassim M, Nasir BA. Sediment size characteristics of urban drains in Malaysian cities. Urban Water 2000;2:335-341. crossref(new window)