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Pre-oxidation of Microcystis aeruginosa-laden water by intensified chlorination: Impact of growth phase on cell degradation and in-situ formation of carbonaceous disinfection by-products.
Sci Total Environ. 2022 Jan 20; 805:150285.ST

Abstract

Algal growth strongly affects the change in characteristics of algal organic matter (AOM) in algae-laden water. AOM has adverse effects on algal cell removal from natural water by coagulation-sedimentation, frequently results in the significant formation of disinfection by-products (DBPs), such as trihalomethanes (THMs) and haloacetic acids (HAAs). This study aimed to investigate the effects of pre-chlorination on Microcystis aeruginosa (MA)-laden water collected in exponential and decline phases and the corresponding in-situ formed carbonaceous DBPs (C-DBPs) within 10 min exposure time. An automated fluorescent cell counter was used to determine the changes in cell degradation and viability, and fluorescent organic matters were characterized. The results have shown that MA cells suffer a faster and stronger degradation in chlorination at the exponential phase to cause more pronounced viability loss (>70%) than that at the decline phase, resulting in more significant released AOM degradation and C-DBPs formation, especially for THMs formation. In chlorination, a significant degradation in SMP-like and HA-like substances occurs at the exponential phase, while AP-like and SMP-like organics are predominantly degraded at the decline phase. Both THM and HAA precursors play an important role towards in-situ formation of C-DBPs at the exponential phase while THM precursors are dominant at the decline phase. THMs formation decreases with increasing HAAs formation over time during chlorination at the exponential phase, but stagnant THMs and HAAs formation occurs at the decline phase. Intensified pre-chlorination at high dosing ratio (Cl2:DOC = 1:1) favors to facilitate in-situ formation of THMs. It is concluded that algal growth phase impact on cell removal and C-DBPs formation should be concerned for intensified pre-chlorination towards MA-laden water for drinking water treatment.

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Publisher Full Text (DOI)

Authors+Show Affiliations

Lin JL
Department of Environmental Engineering, Chung Yuan Christian University, Chung-Li, Taiwan, ROC; Center for Environmental Risk Management, College of Engineering, Chung Yuan Christian University, Chung-Li, Taiwan, ROC. Electronic address: jrlin@cycu.edu.tw.
Ika AR
Department of Environmental Engineering, Chung Yuan Christian University, Chung-Li, Taiwan, ROC; Center for Environmental Toxin and Emerging-Contaminant Research, Cheng Shiu University, Kaohsiung, Taiwan, ROC.

MeSH

ChlorineDisinfectantsDisinfectionHalogenationMicrocystisTrihalomethanesWater Pollutants, ChemicalWater Purification

Pub Type(s)

Journal Article

Language

eng

PubMed ID

34537707

Citation

Lin, Jr-Lin, and Aldeno Rachmad Ika. "Pre-oxidation of Microcystis Aeruginosa-laden Water By Intensified Chlorination: Impact of Growth Phase On Cell Degradation and In-situ Formation of Carbonaceous Disinfection By-products." The Science of the Total Environment, vol. 805, 2022, p. 150285.
Lin JL, Ika AR. Pre-oxidation of Microcystis aeruginosa-laden water by intensified chlorination: Impact of growth phase on cell degradation and in-situ formation of carbonaceous disinfection by-products. Sci Total Environ. 2022;805:150285.
Lin, J. L., & Ika, A. R. (2022). Pre-oxidation of Microcystis aeruginosa-laden water by intensified chlorination: Impact of growth phase on cell degradation and in-situ formation of carbonaceous disinfection by-products. The Science of the Total Environment, 805, 150285. https://doi.org/10.1016/j.scitotenv.2021.150285
Lin JL, Ika AR. Pre-oxidation of Microcystis Aeruginosa-laden Water By Intensified Chlorination: Impact of Growth Phase On Cell Degradation and In-situ Formation of Carbonaceous Disinfection By-products. Sci Total Environ. 2022 Jan 20;805:150285. PubMed PMID: 34537707.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Pre-oxidation of Microcystis aeruginosa-laden water by intensified chlorination: Impact of growth phase on cell degradation and in-situ formation of carbonaceous disinfection by-products. AU - Lin,Jr-Lin, AU - Ika,Aldeno Rachmad, Y1 - 2021/09/14/ PY - 2021/05/07/received PY - 2021/08/15/revised PY - 2021/09/07/accepted PY - 2021/9/20/pubmed PY - 2021/11/25/medline PY - 2021/9/19/entrez KW - Chlorination KW - Disinfection-by product KW - Growth phase KW - Microcystis aeruginosa SP - 150285 EP - 150285 JF - The Science of the total environment JO - Sci Total Environ VL - 805 N2 - Algal growth strongly affects the change in characteristics of algal organic matter (AOM) in algae-laden water. AOM has adverse effects on algal cell removal from natural water by coagulation-sedimentation, frequently results in the significant formation of disinfection by-products (DBPs), such as trihalomethanes (THMs) and haloacetic acids (HAAs). This study aimed to investigate the effects of pre-chlorination on Microcystis aeruginosa (MA)-laden water collected in exponential and decline phases and the corresponding in-situ formed carbonaceous DBPs (C-DBPs) within 10 min exposure time. An automated fluorescent cell counter was used to determine the changes in cell degradation and viability, and fluorescent organic matters were characterized. The results have shown that MA cells suffer a faster and stronger degradation in chlorination at the exponential phase to cause more pronounced viability loss (>70%) than that at the decline phase, resulting in more significant released AOM degradation and C-DBPs formation, especially for THMs formation. In chlorination, a significant degradation in SMP-like and HA-like substances occurs at the exponential phase, while AP-like and SMP-like organics are predominantly degraded at the decline phase. Both THM and HAA precursors play an important role towards in-situ formation of C-DBPs at the exponential phase while THM precursors are dominant at the decline phase. THMs formation decreases with increasing HAAs formation over time during chlorination at the exponential phase, but stagnant THMs and HAAs formation occurs at the decline phase. Intensified pre-chlorination at high dosing ratio (Cl2:DOC = 1:1) favors to facilitate in-situ formation of THMs. It is concluded that algal growth phase impact on cell removal and C-DBPs formation should be concerned for intensified pre-chlorination towards MA-laden water for drinking water treatment. SN - 1879-1026 UR - https://www.unboundmedicine.com/medline/citation/34537707/Pre_oxidation_of_Microcystis_aeruginosa_laden_water_by_intensified_chlorination:_Impact_of_growth_phase_on_cell_degradation_and_in_situ_formation_of_carbonaceous_disinfection_by_products_ DB - PRIME DP - Unbound Medicine ER -