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Currently, a big problem is increasing the production of residual oil, for which so-called tertiary recovery methods are used. One common tertiary recovery method is the use of surfactants. The use of biological surfactants instead of synthetic ones can solve the problem of increasing oil production and reducing the toxic impact on the environment. To obtain biosurfactants, two strains of Bacillus mojavensis and Bacillus amyloliquefaciens were used. These strains are characterized by the ability to produce biosurf...

Annually, a city with 500,000 inhabitants generates approximately 115.5 million cubic meters of wastewater. The treatment of this wastewater is efficiently managed using activated sludge, which comprises a diverse community of protozoa, infusoria, lower crustaceans, algae, and microorganisms. These organisms facilitate the effective treatment of large volumes of wastewater in treatment plants. However, the activated sludge proliferates by consuming organic materials in the wastewater, resulting in the accumulation...

Biochar is a highly porous pyrolysis product with a high specific surface area and adsorption properties, capable of adsorbing various compounds and formations, including ARG-containing MGEs. To assess the ability of biochar to adsorb MGE, a model experiment was carried out: in sterill flasks, the microbial community isolated from composts was cultivated on LB-medium, oxytetracycline and a mixture of heavy metals were added as factors potentially stimulating the production of MGE. Neither heavy metals nor oxytetra...

Soil contamination by polycyclic aromatic hydrocarbons (PAHs) is a widespread concern due to the high potential for human exposure through inhalation, ingestion, and dermal contact. In this study, we compared the efficiency of three different methods for PAHs extraction from model samples, including ultrasonic (US), mechanical shaking and purification with commercial QuEChERS kit (Shq), and ultrasonic extraction coupled with QuEChERS (USq) by gas chromatography coupled to a triple quadrupole tandem mass-spectromet...

The use of microalgae as carbon sequestrators requires optimization of the cultivation process. Growth curves for three types of microalgae were plotted. The growth was carried out at different temperatures 30 and 35 ? and with initially different concentrations of inoculum 30 and 3% in order to assess the possibility of growing crops at the lowest cost and with a high yield of a useful product. We used 3 strains of microalgae - potential sequestrators. The introduction of the inoculum at a dose of 30% led to an a...

The number of registered cases of COVID-19 is increasing in the world, and some countries are reporting a second wave of the pandemic. Accurate and real time information about epidemiological situation is therefore urgently needed for managing decisions in the countries, regions and municipalities which are affected. Massive testing of viral presence in people’s saliva, a smear from the nose, nasopharynx and / or oropharynx, bronchial lavage water obtained by fibrobronchoscopy (bronchoalveolar lavage), as well as ...