Effect of CaCO3(S) Nucleation Modes on Algae Removal from Alkaline Water

Jin Yong Choi, Kerry A. Kinney, Lynn E. Katz

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The role of calcite heterogeneous nucleation was studied in a particle-coagulation treatment process for removing microalgae from water. Batch experiments were conducted with Scenedesmus sp. and Chlorella sp. in the presence and absence of carbonate and in the presence and absence of magnesium to delineate the role of CaCO3(S) nucleation on microalgae removal. The results indicate that effective algae coagulation (e.g., up to 81% algae removal efficiency) can be achieved via heterogeneous nucleation with CaCO3(S); however, supersaturation ratios between 120 and 200 are required to achieve at least 50% algae removal, depending on ion concentrations. Algae removal was attributed to the adsorption of Ca2+ onto the cell surface, which provides nucleation sites for CaCO3(S) precipitation. Bridging of calcite particles between the algal cells led to rapid aggregation and formation of larger flocs. However, at higher supersaturation conditions, algae removal was diminished due to the dominance of homogeneous nucleation of CaCO3(S). The removal of algae in the presence of Ca2+ and Mg2+ required higher supersaturation values; however, the shift from heteronucleation to homonucleation with increasing supersaturation was still evident. The results suggest that water chemistry, pH, ionic strength, alkalinity, and Ca2+ concentration can be optimized for algae removal via coagulation and sedimentation.

Original languageEnglish (US)
Pages (from-to)11694-11703
Number of pages10
JournalEnvironmental Science and Technology
Volume53
Issue number20
DOIs
StatePublished - Oct 15 2019

Fingerprint

alkaline water
Algae
nucleation
Nucleation
alga
Supersaturation
supersaturation
Water
Coagulation
coagulation
Calcium Carbonate
calcite
Carbonates
Alkalinity
removal
effect
Ionic strength
Sedimentation
water chemistry
Magnesium

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Effect of CaCO3(S) Nucleation Modes on Algae Removal from Alkaline Water. / Choi, Jin Yong; Kinney, Kerry A.; Katz, Lynn E.

In: Environmental Science and Technology, Vol. 53, No. 20, 15.10.2019, p. 11694-11703.

Research output: Contribution to journalArticle

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