A5054292726- Bauxite Residue and Utilization
- Electrokinetic Soil Remediation Techniques
- Heavy metals in environment
- Mine drainage and remediation techniques
- Recycling and utilization of industrial and municipal waste in materials production
- Extraction and Separation Processes
- Soil Carbon and Nitrogen Dynamics
- Microbial Fuel Cells and Bioremediation
- Recycling and Waste Management Techniques
- Water Quality Monitoring and Analysis
- Environmental remediation with nanomaterials
- Wastewater Treatment and Nitrogen Removal
- Soil and Unsaturated Flow
- Environmental Toxicology and Ecotoxicology
- Coal and Its By-products
- Chemistry and Chemical Engineering
- Magnetic and Electromagnetic Effects
- Microbial bioremediation and biosurfactants
- Odor and Emission Control Technologies
- Analytical chemistry methods development
- Soil Geostatistics and Mapping
- Mining and Gasification Technologies
- Geological Modeling and Analysis
- Agricultural Science and Fertilization
- Arsenic contamination and mitigation
Budapest University of Technology and Economics
2013-2024
This paper identifies the spatial extent of bauxite processing residue (red mud)-derived contaminants and modes transport within Marcal Rába river systems after dike failure at Ajka, western Hungary. The geochemical signature red mud is apparent throughout 3076 km2 system principally with elevated Al, V, As, Mo. Elevated concentrations Cr, Ga, Ni are also observed 2 km source areas in aqueous particulate phases where hyperalkalinity (pH < 13.1) apparent. Although some trace elements exceed...
In the 5 years since 2010 Ajka red mud spill (Hungary), there have been 46 scientific studies assessing key risks and impacts associated with largest single release of bauxite-processing residue (red mud) to environment. These provided insight into main environmental concerns, as well effectiveness remedial efforts that can inform future management elsewhere. The immediate after were highly caustic nature slurry fine particle size, which once desiccated, could generate fugitive dust. Studies...
Biochar is produced from a wide range of organic materials by pyrolysis, specifically for improvement poor quality soils. One the main issues nowadays in studying biochar as soil amendment to upscale experiments and move short-term, laboratory conditions long-term field trials. This paper presents study, being final step scale-up technology development, on grain husk fibre sludge application with focus two degraded types temperate region. The effects an acidic calcareous sandy agricultural...
An integrated assessment of biological activity and ecotoxicity fluvial sediments in the Marcal river catchment (3078 km2), western Hungary, is presented following accidental spill bauxite processing residue (red mud) Ajka. Red mud contaminated are characterised by elevated pH, trace element concentrations (e.g. As, Co, Cr, V), high exchangeable Na, induce an adverse effect on test species across a range trophic levels. While background contamination system highlighted effects some at sites...
ABSTRACT BACKGROUND Red mud is a by‐product of alumina extraction from bauxite by the Bayer process produced in billion tons scale worldwide. muds, or more generally residues, are regarded as waste, but may potentially be valuable sources critical raw materials ( CRM ). In present study both conventional extracting agents (mineral acids) and small molecular weight complexing (organic were evaluated regarding their efficiency to extract such rare earth elements REEs ) red mud. On molar base,...
After the red mud spill in Hungary one of risk reduction measures was to remove deposits from soil surface. The residual thin layer ploughed into soil. aim present 8-month-long lab-scale microcosm experiment estimate amount with no adverse effects on as natural habitat and assess mid-term environmental mixed ratio ranged between 0–40 %. experiments were monitored by physico-chemical, biological ecotoxicological methods. Mixing 5 % significantly increased total As, Cr, Ni, Pb Na content soil,...
Scandium (Sc) has various technological applications, but the concentrations of Sc in ores are low. Both, mining low concentrated and production industrial-grade a heavy burden on environment. Bauxite residue (BR) from alumina represents one major sources Europe (Ochsenkühn-Petropulu et al., 1994). The goal this study is to assess environmental impacts cradle gate novel route developed Aluminium project (SCALE) extract at < 100 ppm BR, concentrate upgrade it pure ScF3 Sc2O3 ultimately refine...
Abstract BACKGROUND Red mud is increasingly considered a valuable by‐product requiring development of new re‐use technologies instead deposition as waste. This paper reports the results microcosm study aiming to reveal beneficial effects Ajka red mud, soil ameliorant, on specific acidic sandy in eastern Hungary. RESULTS The amount mixed into ranged between 0 and 50%. experiment was monitored by an integrated methodology combining physical chemical methods with biological ecotoxicological...
In the present study, sequential reductive/oxidative bioelectrochemical process has been tested with real groundwater from a contaminated site in Northern Italy for chlorinated aliphatic hydrocarbons (CAHs) removal. The system was developed by connecting series two membrane-less microbial electrolysis cells (MECs) equipped an internal graphite counter electrode. first MEC aimed at CAHs reductive dechlorination (RD) and constituted of granular working second MEC, mixed metal oxide electrode...
A soil column experiment was set up to investigate the effect of red mud from Ajka (Hungary) on a typical profile affected area. The chemical changes caused by leachate and effects these living organisms were assessed. Ecotoxicological tests performed with Vibrio fischeri, Sinapis alba Folsomia candida number aerobic heterotrophic microorganisms determined. total, plant-available, exchangeable water-soluble fractions Na, Mo, Cu Cr increased in soil, mostly owing their leaching layer, but...
Abstract BACKGROUND Critical raw materials ( CRM ) are crucial to Europe's economy and essential maintaining improving our quality of life due their usage for production many devices. Red mud is generated from alumina where bauxite digested in hot sodium hydroxide solution during the Bayer process. can contain considerable amounts such as rare earth elements REEs ). In present study, purification perturbing, co‐extracted Fe Al red hydrochloric acid leachates was evaluated. RESULTS A first...
The red mud catastrophe of October 2010 in Hungary draw the attention to problem disposal sites, storage reservoirs and other wastes mining origin that pose severe threats humans environment all over world. Present study introduces results risk assessment supported management priority risks decision making on necessary most efficient reduction measures.
The demand within the European Union (EU) for crucial raw material Scandium (Sc), coupled with lack of sufficient recovery strategies, has gravitated research into exploiting alternative secondary sources. Utilizing residues from ore-production processes proven to be a successful attempt advanced Sc recovery. Despite emergence new technologies such residues, potential environmental impacts byproducts and technology wastes are often disregarded. Our study aimed assess efficiency pilot-scale...
The lack of high-grade scandium (Sc) ores and recovery strategies has stimulated research on the exploitation non-ore-related secondary sources that have great potential to safeguard critical raw materials supply EU's economy. Waste may satisfy growing global Sc demand, specifically residues from titanium dioxide (TiO2) production. New technologies are being developed for such residues; however, possible environmental impacts intermediary products usually not considered. In order provide a...