Controlling eutrophication by combined bloom precipitation and sediment phosphorus inactivation
| Autor: | Frank van Oosterhout, Miquel Lürling |
|---|---|
| Přispěvatelé: | Aquatic Ecology (AqE) |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Cyanobacteria
Chlorophyll Geologic Sediments Aquatic Ecology and Water Quality Management dissolved organic-matter ecological restoration of-the-art lake restoration cyanobacteria chemistry.chemical_compound Water column ecologisch herstel lakes Chemical Precipitation cyanobacteriën sedimentatie Phoslock phosphorus Waste Management and Disposal Water Science and Technology Netherlands polyaluminum chloride lanthaan biology Geography Sewage Ecological Modeling national bentoniet Pollution eutrophication prymnesium-parvum haptophyceae Environmental chemistry rare-earth-elements tests sedimentation Bloom fosfor Environmental Engineering lanthanum meren Aphanizomenon oppervlaktewaterkwaliteit noord-brabant phosphate adsorption microcystis-aeruginosa Nephelometry and Turbidimetry flocculation Microcystis aeruginosa Civil and Structural Engineering Hydrology Analysis of Variance local soils WIMEK Chlorophyll A bentonite Photosystem II Protein Complex uitvlokking Aquatische Ecologie en Waterkwaliteitsbeheer biology.organism_classification chemistry harmful cyanobacterial blooms Eutrophication surface water quality eutrofiëring |
| Zdroj: | Water Research, 47(17), 6527-6537 Water Research, 47(17), 6527-6537. Elsevier B.V. Water Research 47 (2013) 17 |
| ISSN: | 0043-1354 |
| DOI: | 10.1016/j.watres.2013.08.019 |
| Popis: | The hypothesis that the combination of the flocculent polyaluminium chloride (PAC) with the lanthanum-modified bentonite Phoslock ® (Flock & Lock) could sink effectively a water bloom of cyanobacteria and could shift a turbid, cyanobacteria infested lake to a clear water lake was tested in a controlled laboratory experiment and a whole lake experiment. In the laboratory, a relatively low dose of the flocculent PAC (2.2 and 4.4 mg Al l −1 ) was insufficient to sediment positively buoyant cyanobacteria ( Microcystis aeruginosa ). Similarly, the lanthanum modified clay (dosed at 390 mg l −1 ) was insufficient to sediment the positively buoyant cyanobacteria. However, the combination of PAC and Phoslock ® effectively sedimented cyanobacteria flocks. Likewise, a combined treatment of 2 tons PAC and 18 tons Phoslock ® in Lake Rauwbraken in April 2008 effectively sedimented a developing cyanobacteria bloom of Aphanizomenon flos-aquae. The average chlorophyll- a concentration in the two years prior to this Flock & Lock treatment was 19.5 (±36.5) μg l −1 , while it was as low as 3.7 (±4.5) μg l −1 in the years following the treatment. The combined treatment effectively reduced the amount of total phosphorus (TP) in the water column from on average 169 (±126) μg P l −1 before the application to 14 (±15) μg P l −1 after the treatment. Based on mean summer chlorophyll- a and TP concentrations, the lake was shifted from a eutrophic/hypertrophic state to an oligo/mesotrophic state. From directly after treatment in April 2008 until and including 2013, Lake Rauwbraken remained in an oligo-mesotrophic clear water state with TP reduced to less than 10% of the pre-treatment. This result shows that eutrophication in relatively small, isolated, stratifying lakes can be restored by targeting both water column and sediment P using a combination of flocculent and solid phase P-sorbent. |
| Databáze: | OpenAIRE |
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