Huser, Brian
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences
Abstract
The combination of a low dose of coagulant with a ballast, also known as "flock and sink," has been proposed as a lake restoration and cyanobacteria bloom management strategy. The effectiveness of this technique using aluminum sulfate (alum) as a coagulant and a local soil (LS) from Thailand as a ballast in eutrophic water dominated by positively buoyant Microcystis colonies collected from a tropical lake was investigated by measuring changes in chlorophyll-a (chl-a), pH, and zeta potential. Cell integrity was also evaluated using scanning electron microscopy. Results showed that alum alone could reduce chl-a (up to 60% to 83%) at doses (higher than 3 to 6 mg Al/L) dependent on the initial pH (7.6 to 8.2) and initial chl-a concentration (138 to 615 mu g/L) of the lake water but resulted in morphological changes to cellular structure and generally required a dose that reduced pH to
Keywords
alum; eutrophication; flock and sink; lake restoration; scanning electron microscope
Published in
Water
2021, volume: 13, number: 2, article number: 111
Publisher: MDPI
SLU Authors
Global goals (SDG)
SDG6 Clean water and sanitation
UKÄ Subject classification
Environmental Sciences
Oceanography, Hydrology, Water Resources
Publication identifier
- DOI: https://doi.org/10.3390/w13020111
Permanent link to this page (URI)
https://res.slu.se/id/publ/110698