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Wpływ niklu na wzrost szczepu stenotrophomonas maltolphilia KB2 w obecności fenolu

Szczyrba Elżbieta, Gąszczak Agnieszka, Szczotka Anna, Kolarczyk Hanna, Janus Bożena

Prace Naukowe Instytutu Inżynierii Chemicznej Polskiej Akademii Nauk

2020

nr 24

95--105

Wykonano eksperymenty mające na celu zbadanie wzrostu komórek szczepu KB2 w obecności niklu, przy zastosowaniu fenolu jako źródła węgla i energii. Przeprowadzane badania potwierdziły hamujący wpływ niklu na wzrost badanego szczepu nawet dla niskich stężeń tego metalu.

The influence of nickel on the growth of KB2 strain was tested for different concentrations of metal in the presence of phenol as the sole carbon and energy source. The inhibition effect of nickel on bacterial growth was confirmed even for low concentration of tested metal.

The variability of the concentration of bioaerosols above the chambers of biological wastewater treatment

Michałkiewicz M., Kruszelnicka I., Widomska M.

Ecological Chemistry and Engineering. S

2018

Vol. 25, nr 2

267--278

The article presents the results of research over microorganisms (psychrophilic and mesophilic bacteria and microscopic fungi) found in wastewater in denitrification and nitrification chambers and specifies the proportion of these microorganisms in bioaerosol at various levels above wastewater level (20, 50 and 100 cm). In the denitrification chamber (anoxic) in 1 cm3 of sewage there were on average 30.35 · 106 CFU of mesophilic bacteria, 72.88 · 106 CFU of psychrophilic bacteria, and 37.3 · 105 CFU of microscopic fungi. In the nitrification chamber, where the oxygen concentration ranged from 0.37 to 2.32 mg O2·dm−3 of wastewater, the number of microorganisms was lower. In 1 cm3 of wastewater there were on average 20.2 · 106 CFU of mesophilic bacteria, 51.76 · 106 CFU of psychrophilic bacteria, and 15.22 · 105 CFU of microscopic fungi. In sewage bioaerosols above these chambers, higher numbers of psychrophilic bacteria than mesophilic ones and microscopic fungi were reported. At the same time differences in the number of microorganisms at different heights above the surface of wastewater could be observed in bioaerosol, as well as between the chambers of the bioreactor. It was found that most frequently the amount of microorganisms decreased with height. The percentage emission ratio (ER) of microorganisms in bioaerosols coming from wastewater accounted for only a fraction of a percent and ranged from 1.13 · 10−8 % (microscopic fungi over the denitrification chamber) to 24.53 · 10−9 % (psychrophilic bacteria over the denitrification chamber). It was found that the process of mixing, aeration of wastewater, have an effect on the emission of microorganisms.