In:
Journal of Korean Society of Environmental Engineers, Korean Society of Environmental Engineering, Vol. 42, No. 6 ( 2020-06-30), p. 319-326
Abstract:
Objectives:This study evaluated the removal of 〈 i 〉 Microcystis 〈 /i 〉 by coagulation in raw waters with three different cell densities.Methods:Raw waters were prepared at three different cell densities (target cell densities of 10,000, 100,000, and 1,000,000 cell/mL; actual cell densities of 9,950, 102,000, and 991,000 cell/mL) by adding 〈 i 〉 Microcystis 〈 /i 〉 into surface water from Nakdong river. Jar-tests were conducted with PACL, alum, illite, and loess at dosages of 0-150 mg/L.Results and Discussion:Regardless of coagulant types, the removal rates of 〈 i 〉 Microcystis 〈 /i 〉 increased as the coagulant dosages increased. PACl and alum exhibited higher removal rates than illite and loess; PACl was the best coagulant to remove 〈 i 〉 Microcystis 〈 /i 〉 . Removal of chlorophyll-a was highest when PACl added at 20.4 mg/L, and no significant increase in removal rate was observed with higher dosages of PACl. However, removal rates of chlorophyll-a by illite and loess gradually increased as the dosages increased.Conclusions:With the coagulants tested in this study, removal rates of 〈 i 〉 Microcystis 〈 /i 〉 increased as the coagulant dosages increased. Removal rates of 〈 i 〉 Microcystis 〈 /i 〉 increased as the cell densities increased probably because 〈 i 〉 Microcystis 〈 /i 〉 acted as particles which could enhance the coagulation efficiency.
Type of Medium:
Online Resource
ISSN:
1225-5025
,
2383-7810
DOI:
10.4491/KSEE.2020.42.6.319
Language:
English
Publisher:
Korean Society of Environmental Engineering
Publication Date:
2020
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