Untitled

Kapfer, Maria

doi:10.1023/a:1005125916712

Cited by 39 publications

(2 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The capability to simulate several additional redox processes as kinetically controlled reactions was also included. Rate expressions for the pH-dependence of Fe(II) ,− and NH 4 , oxidation were included, as well as a photochemical reaction between DOC and Fe(III). , Limited availability of P in pit lakes is often attributed to association with phases such as Fe (oxy)hydroxides; − sorption of P to Fe(OH) 3(s) was also implemented, with a Langmuir isotherm, − including allowance for the pH-dependence of the maximum sorbed P concentration on Fe(III) minerals (see Figure SI-TS3-S1). All model equations and constants, as well as computational aspects, are given in the SI.…”

Section: Model Descriptionmentioning

confidence: 99%

Quantifying Lake Water Quality Evolution: Coupled Geochemistry, Hydrodynamics, and Aquatic Ecology in an Acidic Pit Lake

Salmon

Hipsey

Wake

et al. 2017

Environ. Sci. Technol.

View full text Add to dashboard Cite

Assessment of water quality evolution in the thousands of existing and future mine pit lakes worldwide requires new numerical tools that integrate geochemical, hydrological, and biological processes. A coupled model was used to test alternative hypothesized controls on water quality in a pit lake over ∼8 years. The evolution of pH, Al, and Fe were closely linked; field observations were reproduced with generic solubility equilibrium controls on Fe(III) and Al and a commonly reported acceleration of the abiotic Fe(II) oxidation rate by 2-3 orders of magnitude. Simulations indicated an ongoing acidity loading at the site, and the depletion of Al mineral buffering capacity after ∼5 years. Simulations also supported the existence of pH limitation on nitrification, and a limitation on phytoplankton growth other than the commonly postulated P and DIC limitations. Furthermore, the model reproduced the general patterns of salinity, pH, Al, and Fe during an uncontrolled river breach in 2011, however, incorporating sediment biogeochemical feedbacks is required to reproduce the observed postbreach internal alkalinity generation in the lake. The modeling approach is applicable to the study of hydrological, geochemical, and biological interactions for a range of lake and reservoir management challenges.

show abstract

Section: Model Descriptionmentioning

confidence: 99%

Quantifying Lake Water Quality Evolution: Coupled Geochemistry, Hydrodynamics, and Aquatic Ecology in an Acidic Pit Lake

Salmon

Hipsey

Wake

et al. 2017

Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…However, phosphate sorbed on iron oxides represents a dynamic phosphate reservoir regulated by photoreduction (Tate et al 1995). Nutrient supply from the sediment favours benthic algae (Nixdorf and Kapfer 1998;Kapfer 1998). Tate et al (1995) reports the assimilation of phosphate directly from water by periphyton layer dominated with Ulothrix in acid mine drainage streams.…”

Section: Diversitymentioning

confidence: 99%

Eukaryotes in acidic mine drainage environments: potential applications in bioremediation

Das

Roy

Singh

et al. 2009

Rev Environ Sci Biotechnol

View full text Add to dashboard Cite

Passive remediation of Acid Mine Drainage (AMD) is a popular technology continuously under development for more than 50 years now. Roles of eukaryotes, the natural residents of AMD and its attenuator are not emphasized adequately. Studies suggest that macrophyte distinctively generate alkalinity through benthic sediments as part of root respiration. Other eukaryotic populations effectively enrich the carbon source for maintaining sulphate reducing bacterial (SRB) populations and act symbiotically. Algae produce anoxic zones for SRB action and help in biogenic alkalinity generation. While studies on algal populations and actions are relatively available those on fungal population are limited. Fungi show capacity to absorb significant amount of metals in their cell wall, or by extra cellular polysaccharide slime. This review examines the roles of these microorganisms and documents their activities in holistic form in the mine water environment. This work discusses the potential areas of likely future research that could enable AMD remediation using active eukaryotes to be made on sound understanding.

show abstract