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Environmental Engineering Research 2002;7(1): 39-48. DOI: https://doi.org/10.4491/eer.2002.7.1.039
Jun-Ho Lee1, Ki-Woong Bang2, Myong-Jin Yu3, and Jong-Soo Choe4
1Department of Environmental Engineering, Chongju National College of Science and Technology, Chungchongbuk-Do 367-701, Korea
2Division of Civil, Environment and Urban Engineering, Hanbal National University, Daejeon 305-719, Korea
3Division of Environmental Engineering, University of Seoul, Seoul 130-743, Korea
4Korea Land Corporation, Kyonggi-do 463-010, Korea
Corresponding Author: Jun-Ho Lee ,Tel: +82-43-820-5274, Fax: +82-43-820-5272, Email: jlee@cjnc.ac.kr
Received: October 6, 2001;  Accepted: February 6, 2002.
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The use of vortex concentrators is becoming increasingly popular for suspended solids reduction in combined sewer overflows and storm sewer discharges. This study is a laboratory investigation of the use of vortex concentrators to reduce the solids concentration of synthesized wastewaters. The synthesized wastewaters were made with tap water and addition of three particle types, sand, granular activated carbon, or sewage solids, which were collected, dried, graded by wet sieve size, and resuspended. These solids were collected from either a combined sewer overflow or storm sewer discharge. The range of surface loadings investigated was 120 to 850 m3/m2 day, and suspended solids concentrations were varied from 300 to 5,000 mg/L. The laboratory vortex concentrators were operated without addition of coagulant or with addition of polyacrylamide (PAM). Sand particles in the intermediate size range of 90 to 150 fim were reduced 59% without coagulant addition. Granular activated carbon particles in the intermediate size range of 150 to 300 ^m were reduced 65% without coagulant addition. In both type particles, larger diameter sizes were removed more completely and smaller sizes less completely. Sewage solids suspensions were tested in two size ranges, less than 45 /im and 45 to 250 //m. These particles were from either combined sewers or storm sewers. Reductions ranged from 46% for small solids without coagulant addition to 94% for large solids with coagulant addition. Also reported are the effect of hydraulic retention time, suspended solids concentration, ratio of overflow to foul flow (i.e., underflow).
Keywords: polyacrylamide | surface loading rate | suspended solids | vortex concentrator
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