| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 4424681 | Environmental Pollution | 2012 | 8 Pages |
As the eutrophication of lakes becomes an increasingly widespread phenomenon, cyanobacterial blooms are occurring in many countries. Although some research has been reported, there is currently no good method for bloom removal. We propose here a new two-step integrated approach to resolve this problem. The first step is the inactivation of the cyanobacteria via the addition of H2O2. We found 60 mg/L was the lowest effective dose for a cyanobacterial concentration corresponding to 100 μg/L chlorophyll-a. The second step is the flocculation and sedimentation of the inactivated cyanobacteria. We found the addition of lake sediment clay (2 g/L) plus polymeric ferric sulfate (20 mg/L) effectively deposited them on the lake bottom. Since algaecides and flocculants had been used separately in previous reports, we innovatively combined these two types of reagents to remove blooms from the lake surface and to improve the dissolved oxygen content of lake sediments.
Graphical abstractThe mechanism for the removal of cyanobacterial blooms by using H2O2, polymeric ferric sulfate (PFS) and lake sediment clay.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► We combined algaecide and flocculants together to control cyanobacterial blooms. ► H2O2 was used to irreversibly inactivate the photosynthesis of cyanobacteria. ► Lake sediment clay and polymeric ferric sulfate were used to deposit cyanobacteria. ► Removal rate was very high and re-suspension rate was very low under disturbance. ► The inactivated cyanobacteria could not serve as a seed source for the next bloom.
