A5103172197- Wastewater Treatment and Nitrogen Removal
- Soil and Water Nutrient Dynamics
- Environmental Conservation and Management
- Energy, Environment, Agriculture Analysis
- Constructed Wetlands for Wastewater Treatment
- Methane Hydrates and Related Phenomena
- Microbial Fuel Cells and Bioremediation
- Water Treatment and Disinfection
- Anaerobic Digestion and Biogas Production
- Hydrogen embrittlement and corrosion behaviors in metals
- Heavy metals in environment
- Marine and coastal ecosystems
- Electrochemical Analysis and Applications
- Coastal wetland ecosystem dynamics
- Mercury impact and mitigation studies
- Corrosion Behavior and Inhibition
- Plant Surface Properties and Treatments
- Groundwater and Isotope Geochemistry
- Peatlands and Wetlands Ecology
- Crustacean biology and ecology
- Water Quality and Pollution Assessment
- Building materials and conservation
- Environmental Toxicology and Ecotoxicology
- Agriculture, Soil, Plant Science
- Phosphorus and nutrient management
Deltares
2017-2025
Max Planck Institute for Marine Microbiology
2008-2011
Wageningen University & Research
2003-2008
University of Antwerp
2002
Swiss Federal Institute of Aquatic Science and Technology
2000
Nitrogen (N) loss rates were determined in permeable sediments of the Wadden Sea using a combination stable N isotope incubation experiments and model simulation approaches during three seasons. Three different methods that employed pairing technique used: intact core incubations simulating either (1) diffusive or (2) advective transport conditions (3) slurry incubations. from under simulated exceeded those measured by 1–2 orders magnitude, but comparable to observed generally showed little...
In this article, we describe the dynamics of pH, O2 and H2S in top 5–10 cm an intertidal flat consisting permeable sand. These were measured at low water line higher up during several seasons. Together with pore nutrient data, confirm that two types transport act as driving forces for cycling elements (Billerbeck et al. 2006b): Fast surface chemistry occur only inundation. Thus, they must be driven by hydraulics (tidal wave action) are highly dependent on weather conditions. This was...
This study leverages data on deep (>500 m) groundwater from the Dutch subsurface to assess potential impacts of (re)using depleted natural gas fields and aquifers for (large) scale underground storage (e.g., UHS, CO2), geothermal (heat) extraction/storage (GHE/S). To date, we have collected 700 samples obtained 161 onshore offshore wells. comes public geological archive (www.nlog.nl), which contains extensive valuable information accumulated over six decades oil, exploration production in...
In the South-eastern part of Netherlands, nitrate concentrations often exceed limit values in surface water due to agricultural activities. Water bodies should be good chemical status by 2027 according Framework Directive, so measures taken reduce loads streams. this area, many fields are equipped with tile drainage systems. A way emissions is installation woodchip bioreactors which connected these Residence times into account, for negative side effects may prevail when too high. This...
A technique of ligand exchange with DMG (dimethylglyoxime) and DPCSV was applied to determine Ni speciation in lake, river, groundwater samples. The working conditions related ligand-exchange equilibrium were optimized, the kinetics examined. observed pseudo-first-order rate, kobsd, about 3 × 10-5 (s-1) for Ni(DMG)2 complex formation an excess (μM) over (nM) at pH 7.1−7.7. second-order kinetic constants, kexch, between 1.2 102 5.7 103 s-1 M-1 NiEDTA 5 7 natural ligands freshwater samples...
Sulfidic seeps with methane ebullition were observed at the low‐water line of intertidal sand flats a number locations in Wadden Sea. Bioturbating fauna was absent seep areas but abundant more central tidal flat. At one site, vertical and sulfate distribution pore water determined along transects from toward interior The resulting two‐dimensional distributions showed plume methane‐rich sulfate‐depleted reaching depth below 1.2 m beneath surface up to sediment line. δ 13 C released −68.6‰,...
Abstract Microorganisms are able to cause, but also inhibit or protect against corrosion. Corrosion inhibition by microbial processes may be due the formation of mineral deposition layers on metal objects. Such have been found in archaeological studies ancient objects, buried soil, which were hardly corroded. Recent field investigations showed that natural can sheet piles soil. We investigated communities these and adjacent Our data, from five different sampling sites, all show striking...
Abstract The speciation of metals plays an important role in their bioavailability. In the case anaerobic reactors for treatment wastewaters, ubiquitous presence sulfide leads to extensive precipitation like nickel and cobalt, which are essential metabolism microorganisms that carry out mineralization pollutants present wastewater. practice, nickel, iron added excessive amounts full‐scale installations. This study is concerned with complexation cobalt yeast extract its effect on biogas...
In the analysis of metal biouptake from complexing environments, both chemical speciation and biological uptake characteristics have to be taken into account. The commonly used free ion activity model is based on equilibrium implies that diffusion bioactive toward organism not rate-limiting. presence complexes, however, sufficiently labile species might contribute via preceding dissociation. Coupling ensuing diffusional mass transfer flux with metal, supposedly species, shows under which...
Abstract Time series on Crangon crangon densities in the German Wadden Sea show a considerable degree of interannual variability, for entire region spring and autumn as well three subareas, North Frisia, East Frisia Elbe estuary. Across survey area C. density was inversely related to water depth. In after recruitment, settlement shrimp are correlated across larger spatial scale (>100 km longshore), whereas overwintering adult spawning stock is uncorrelated subareas. Interannually, extreme...
Iron sheet piles are widely used to reinforce dikes and river banks. Damage due iron corrosion poses a significant safety risk has economic impact. Different groups of microorganisms known either stimulate or inhibit the process. Recently, natural corrosion-protective deposit layers were found on piles. Analyses microbial composition indicated potential role for methane-producing archaea. However, full metabolic communities within these protective not been determined. The significance this...
ABSTRACT The amount of energy that can be conserved via halorespiration by Desulfitobacterium dehalogenans JW/IU-DC1 was determined comparison the growth yields cells grown with 3-chloro-4-hydroxyphenyl acetate (Cl-OHPA) and different electron donors. Cultures were lactate, pyruvate, formate, or hydrogen as an donor Cl-OHPA acceptor yielded 3.1, 6.6, 1.6, 1.6 g (dry weight) per mol reduction equivalents, respectively. Fermentative on pyruvate 14 oxidized. Pyruvate not fermented...
Competitive ligand exchange−adsorptive stripping voltammetry is applied to speciation analysis of dissolved Ni(II) and Co(II) in an anaerobic bioreactor similar batch media. Co Ni these media can be measured down concentration levels ca. 1 nM. Sulfide interference avoided via removal as H2S. In methanogenic bioreactors, up 95% the present strongly bound forms, with complex stabilities ≥108−109 107−108 mol-1 L, respectively. effluent from sulfate-reducing also found a form, micromolar...
Denitrifying bioreactors are dependent on organic matter supply as a substrate for effective NO removal. In this study, the difference in removal efficiency and side effects when using different sources dosing strategies was tested two field experiments. The were woodchips ethanol. effect of woodchip-enveloped drains. Ethanol supplied to flow-through reactor by passive diffusion through silicone tubing. drains showed 80% during first year application, but rate decreased second third years...
Mitigation measures are needed to prevent large loads of phosphate originating in agriculture from reaching surface waters. Iron-coated sand (ICS) is a residual product drinking water production. It has high adsorption capacity and can be placed around tile drains, taking no extra space, which increases the farmers' acceptance. The main concern regarding use ICS filters below groundwater level that limited oxygen supply organic matter concentrations may lead reduction dissolution iron...
It is known from recent international research that woodchip bioreactors can be an effective measure to reduce emissions of nitrate agricultural drainage water. In the Netherlands, up till now no experience was present with bioreactors. Therefore, a field pilot started at test location situated in lowland catchment south Netherlands (Vredepeel). A bioreactor installed treat water 4 ha arable land on sandy soil. Nitrate measured in- and effluent estimate removal efficiency over time. Also,...