Effective removal of Microcystis aeruginosa and microcystin-LR using nanosilicate platelets
Journal
Chemosphere
Journal Volume
99
Pages
49-55
Date Issued
2014
Author(s)
Abstract
Drinking water safety has been threatened by increasing harmful algal blooms (HABs) in water sources. HABs are closely associated with eutrophication in freshwater lakes, e.g. Lake Tai in China, and marine environments as well, e.g. Baltic Sea in Europe. Among all HABs, Microcystis aeruginosa attracted much attention due to its easy proliferation and potent toxins, microcystins. Most of the current control technologies can result in immediate release of microcystins which are hard to remove by drinking water treatment processes. Here we propose to simultaneously remove M. aeruginosa and its toxin, microcystin-LR (MC-LR), using nanosilicate platelet (NSP) derived from natural clay mineral. In this study, NSP showed strong selective growth inhibition and good settling enhancing effects on M. aeruginosa and highly efficient removal of MC-LR. NSP can inhibit the growth of M. aeruginosa (initial cell concentration at 3.00×106cellmL-1) with a LC50 at 0.28ppm after 12h exposure. At the dosage of 100ppm, NSP can enhance settling of suspended M. aeruginosa. Bacterial growth inhibition tests showed NSP had very mild growth inhibition effects on Escherichia coli at high dosage but promoted the growth of Pseudomonas aeruginosa and Bacillus halodurans. For MC-LR removal, at an initial concentration of 100μgL-1, NSP achieved higher than 99% removal. Thus, the results suggest that NSP could be an excellent candidate for controlling M. aeruginosa-related HABs in water bodies. © 2013.
Subjects
Eutrophication; Harmful algal bloom; Microcystin-LR; Microcystis aeruginosa; Nanosilicate platelet
Other Subjects
Algae control; Bacteriology; Escherichia coli; Eutrophication; Lakes; Platelets; Potable water; Control technologies; Drinking water treatment process; Harmful algal blooms; Initial concentration; Microcystin-LR; Microcystis aeruginosa; Natural clay minerals; Pseudomonas aeruginosa; Water treatment; drinking water; fresh water; microcystin LR; nanocomposite; nanosilicate platelet; unclassified drug; algal bloom; concentration (composition); cyanobacterium; dose-response relationship; drinking water; eutrophication; fecal coliform; growth rate; inhibition; pollution control; safety; silicate; toxin; water treatment; algal bloom; algal growth; article; Bacillus; Bacillus halodurans; bacterial growth; Baltic Sea; China; clay; concentration (parameters); Escherichia coli; eutrophication; lake; marine environment; Microcystis aeruginosa; nonhuman; Pseudomonas aeruginosa; waste component removal; water treatment; Atlantic Ocean; Baltic Sea; China; Europe; Taihu Lake; algae; Bacillus halodurans; Bacteria (microorganisms); Escherichia coli; Microcystis aeruginosa; Pseudomonas aeruginosa; Eutrophication; Harmful algal bloom; Microcystin-LR; Microcystis aeruginosa; Nanosilicate platelet; China; Disinfection; Environmental Remediation; Eutrophication; Harmful Algal Bloom; Lakes; Microcystins; Microcystis; Nanostructures; Silicates; Water Microbiology; Water Purification
Type
journal article