| Home | E-Submission | Sitemap | Contact Us |  
Environmental Engineering Research 2000;5(3): 151-156.
COMPARISON OF SEDIMENTATION AND DISSOLVED AIR FLOTATION MODELING FOR CRYPTOSPORIDIUM REMOVAL
Moo-Young Han, and Won-Tae Kim
School of Civil, Urban and Geosystem Engineering, Seoul National University, Seoul 151-742, Korea
Corresponding Author: Moo-Young Han ,
Received: June 9, 2000;  Accepted: September 8, 2000.
Share :  
ABSTRACT
Removal mechanisms for Cryptosporidium oocysts by sedimentation and dissolved air flotation (DAF) were investigated and compared using mathematical modeling. A set of trajectory analyses was performed for each process to estimate the collision efficiency of Cryptosporidium oocysts and other particles (i.e., floe particle or bubble). The sensitivity of a removal efficiency factor to major parameters of the treatment system was investigated for each process. Trajectory analysis modeling suggested that DAF is a better treatment option than sedimentation for the removal of Cryptosporidium. In sedimentation, floe size and floe zeta potential did not affect the collision efficiency. In DAF, the collision efficiency factor greatly increased when the sign of the zeta potential of bubbles and Cryptosporidium oocysts was opposite. This theory could explain the current practice in DAF which emphasizes the importance of pretreatment. These theoretical predictions agreed well with experimental data obtained by others. An optimum bubble size tor DAF was suggested. In addition, an improved DAF process using a positively charged bubble was proposed based on the theoretical analyses.
Keywords: collision efficiency | Cryptosporidium | oocysts | DAF | sedimentation | trajectory analysis | zeta potential
TOOLS
PDF Links  PDF Links
Full text via DOI  Full text via DOI
Download Citation  Download Citation
  E-Mail
Share:      
METRICS
1,716
View
24
Download
Editorial Office
464 Cheongpa-ro, #726, Jung-gu, Seoul 04510, Republic of Korea
TEL : +82-2-383-9697   FAX : +82-2-383-9654   E-mail : eer@kosenv.or.kr

Copyright© Korean Society of Environmental Engineers. All rights reserved.        Developed in M2community
About |  Browse Articles |  Current Issue |  For Authors and Reviewers