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Cyanobacterial
harmful algal blooms (cyano-HAB) and microcystins
(MCs) can cause a potential threat to public health. Here, a method
for simultaneous removal of cyano-HAB and MCs was developed using
chitosan-modified local soil (MLS) flocculation plus microorganism-modified
soil capping. The experiment was conducted in simulated columns containing
algal water collected from Lake Taihu (China). More than 90% of algal
cells and intracellular MCs were flocculated and removed from water
using chitosan-MLS and the sunken flocs were treated by different
capping materials including Pseudomonas sp. An18 modified local soil. During 40 days of incubation, dissolved
MC-LR and MC-RR showed 10-fold increase in the flocculation-only system.
The increase of MC-LR and MC-RR in water was reduced by 30 and 70%
in soil capping treatments; however, the total content of MCs in the
sediment–water column remained similar to that in the control
and flocculation only systems. In contrast, both dissolved MCs and
total MCs were reduced by 90% in Pseudomonas sp. An18 modified soil capping treatment. The high performance of
toxin decomposition was due to the combined effects of flocculation
and MC-degrading bacteria that embedded in the capping material, which
prevents dilution of bacteria biomass, concentrates algal cells, confines
released toxins, and enhances toxin biodegradation
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