Humic substances interfere with phosphate removal by lanthanum modified clay in controlling eutrophication

Autor: Frank van Oosterhout, Miquel Lürling, Guido Waajen
Přispěvatelé: Aquatic Ecology (AqE)
Jazyk: angličtina
Rok vydání: 2014
Předmět:
Cation binding
Aquatic Ecology and Water Quality Management
phosphates
Time Factors
fosfaten
modified bentonite clay
chemistry.chemical_compound
Lanthanum
Chemical Precipitation
cation binding
Phoslock
Waste Management and Disposal
Water Science and Technology
polyaluminum chloride
Minerals
water bottoms
Ecological Modeling
national
Phosphorus
natural-waters
Hydrogen-Ion Concentration
Pollution
eutrophication
ion-binding
Environmental chemistry
Bentonite
rare-earth-elements
Aluminum Silicates
Environmental Engineering
bioremediëring
chemistry.chemical_element
cyanobacterial toxins
laboratory tests
complex mixtures
phosphorus-binding clay
Bioremediation
Ion binding
Suspensions
bioremediation
waterbodems
laboratoriumproeven
Humic Substances
Civil and Structural Engineering
WIMEK
Electric Conductivity
Environmental engineering
organic-matter removal
Aquatische Ecologie en Waterkwaliteitsbeheer
Phosphate
Carbon
fresh-water
Models
Chemical
chemistry
Clay
Filtration
eutrofiëring
Zdroj: Water Research, 54, 78-88. Elsevier B.V.
Water Research, 54, 78-88
Water Research 54 (2014)
ISSN: 0043-1354
Popis: The lanthanum (La) modified bentonite Phoslock ® has been proposed as dephosphatisation technique aiming at removing Filterable Reactive Phosphorus (FRP) from the water and blocking the release of FRP from the sediment. In the modified clay La is expected the active ingredient. We conducted controlled laboratory experiments to measure the FRP removal by Phoslock ® in the presence and absence of humic substances, as La complexation with humic substances might lower the effectiveness of La (Phoslock ® ) to bind FRP. The results of our study support the hypothesis that the presence of humic substances can interfere with the FRP removal by the La-modified bentonite. Both a short-term (1 d) and long-term (42 d) experiment were in agreement with predictions derived from chemical equilibrium modelling and showed lower FRP removal in presence of humic substances. This implies that in DOC-rich inland waters the applicability of exclusively Phoslock ® as FRP binder should be met critically. In addition, we observed a strong increase of filterable La in presence of humic substances reaching in a week more than 270 μg La l −1 that would infer a violation of the Dutch La standard for surface water, which is 10.1 μg La l −1 . Hence, humic substances are an important factor that should be given attention when considering chemical FRP inactivation as they might play a substantial role in lowering the efficacy of metal-based FRP-sorbents, which makes measurements of humic substances (DOC) as well as controlled experiments vital.
Databáze: OpenAIRE
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