Browsing by Subject "bioleaching"

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Access status: Open Access ,
Badania nad wpływem wybranych czynników fizykochemicznych na efektywność procesu bioługowania odpadów poflotacyjnych przy wykorzystaniu grzybów pleśniowych z gatunku Aspergillus niger
(2007) Kisielowska, Ewa; Kasińska-Pilut, Ewelina; Jaśkiewicz, Justyna
The aim of the research presented is an analysis of ways of utilizing micro floral autochthonous organisms from the after-flotation waste of the Gilow stockpile in order to bioleach copper. The alkaline character of the environment disables the use of the traditional processes of acid bioleaching, because of both the economical and environmental aspects. A research of the bioleaching process of the after-flotation waste was conducted using microfungi of the Aspergillus niger species, which dominate in the autochthonous environment. The metabolism of these microfungi, connected with the production of large amounts of organic acids, allowed to conceptualize their usage in the biohydrometallurgy copper processes. After isolating in a pure culture and multiplying the microfungal biomass Aspergillus niger, the experiments began. Weighed samples of the waste were covered with a selective medium, and then inoculated with the microfungal biomass, playing the role of the bioleaching agent. After thirty days of incubation, the end product was chemically analyzed showing effects of the conducted copper bioleaching process (79,16-87,98%).
Access status: Restricted ,
Bioługowanie kobaltu z odpadów poflotacyjnych deponowanych na składowisku „Żelazny Most” KGHM Polska Miedź S.A.
(Data obrony: 2014-10-03) Kaszuba, Marek
Wydział Geologii, Geofizyki i Ochrony Środowiska
The research is based on possibility of using fungi in cobalt bioleaching out of tailings. After flotation process suspended solids are dumped in „Żelazny Most” KGHM Polska Miedź S.A waste reservoir. In order to achieve the actual results, waste samples were taken from three different locations of reservoir which represent different composition. Before a bioleaching process, microflora from samples was tested in order to choose dominant microorganism. The prevalent fungi species in microflora proved to be Aspergillus niger. In experiments, which where carried out, biomass was inoculated into the flasks with waste and liquid culture medium. After 60 days of bioleaching process three products where isolated: solution, ashed mycelium and waste. This products were chemically analyzed for cobalt content. The results show that fungal bioleaching process was completed successfully, but it is still necessary to conduct further analysis and optimize the process parameters.
Access status: Open Access ,
Circular raw material and waste management: a comparison of biological and chemical approaches for the recovery of metals from spent lithium-ion batteries
(Wydawnictwa AGH, 2025) Urbańska, Weronika; Potysz, Anna
Modern production processes are characterized by the extensive demand for metal in the manufacture of lithium-ion batteries used in electronic equipment and electric vehicles. These products are essential for the functioning of today’s society, therefore, the demand for metallic raw materials increases annually, and their natural resources are overexploited. The solution to this issue is the recovery of raw materials from polymetallic waste, which includes spent lithium-ion batteries. The extraction of metals from this type of waste material has already been implemented on an industrial scale, but the priority now is to create technologies that will not only be effective in terms of metal recovery but also environmentally friendly, following sustainable development goals and the principles of a circular economy. Concerning the need for alternative ecological methods of waste processing, the concept of recovering Co, Cu, Li and Ni from waste lithium-ion batteries using a biotic and mild chemical approach was proposed. It has been determined that the biological approach to metal recovery may be a promising process in the recycling of lithium-ion battery waste since within 7 days, at a pulp density of 1% and using Acidithiobacillus thiooxidans bacteria, comparable results were obtained for the recovery of Co (25.7%), Li (48.8%) and Ni (28.3%) as for leaching with mild organic citric acid. Moreover, the fungus Aspergillus niger may be a promising microorganism used in the bioleaching of electrode powder from spent lithium-ion batteries, although the process using it requires the optimization of bioreactor parameters.
Access status: Open Access ,
Removal of heavy metals from coal medium with application of biotechnological methods
(Wydawnictwa AGH, 2010) Kisielowska, Ewa; Hołda, Anna; Niedoba, Tomasz
The important ecological issue is environmental pollution by heavy metals, which are highly toxic substances for living organisms. The paper presents the problems of possible applications of microorganisms in processes leading to removal of heavy metals from various environments, including coals. The processes occurring with participation of microorganisms as biosorption, bioaccumulation, biotransformation, bioprecipitation, biocrystallization and bioleaching, which can be practically applied in removal of heavy metals from coals connected with their recovery were described in the paper. Furthermore, the examples of interesting works from this area of scientific interest, conducted in various research units in Poland were presented.
Access status: Open Access ,
The bioleaching of silver from the »Żelazny Most« disposal after-flotation wastes in Lubin with application of microfungi from genus Aspergillus niger
(2012) Kisielowska, Ewa; Wojtasik, Rafał; Kasińska-Pilut, Ewelina; Hołda, Anna
Celem zaprezentowanego badania była analiza sposobów zastosowania autochtonicznych organizmów mikroflory w celu bioługowania srebra z odpadów poflotacyjnych w składowisku Gilow. Badanie procesu bioługowania przeprowadzono z zastosowaniem grzybów z gatunku Aspergillus niger, które dominują w środowisku autochtonicznym. Metabolizm tych grzybów, związany z produkcją znacznych ilości kwasów organicznych, pozwala na użycie ich w procesach biohydrometalurgii srebra. Po wyizolowaniu czystej kultury biomasy Aspergillus niger i jej pomnożeniu rozpoczęto eksperyment. Zważone próbki odpadów zostały pokryte wybraną pożywką a następnie zaszczepione biomasą mikrogrzybni, która pełniła rolę odczynnika bioługującego. Po trzydziestu dniach inkubacji produkt końcowy został zanalizowany chemicznie, pokazując efekty przeprowadzonego procesu bioługowania (12-41,5%).