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The production of sulphuric acid is not ecologically clean regardless of the employed technology. This is a result of the surplus discharge of sulphur oxides into the atmosphere, but there are kinetic and technological possibilities of decreasing this to an ecologically safe level.
The influence of sulphur compounds in the atmosphere on the natural environment has been discussed. Today, production of sulphuric acid is not ecologically clean regardless of the employed technology. The year 1996 was decisive in the production of H2SO4 sulphuric acid as the modern method of non-reacted SOx sulphur compound evacuation was applied in the POLCHEM - Toruń Inorganic Chemical Plant.
In vitro seed germination and embryo culture have been achieved in Nothapodytes foetida, this plant is known for its rich source of anticancer drug i. e., Camptothecin. In present study both normal and decoated seeds were subjected to different treatments viz., H2O, GA3, H2O2, H2SO4, chlorine water and mechanical scarification, further these were germinated on water agar medium (WA), filter paper bridge (FB), half strength MS (HMS) and full strength MS (FMS) medium. The highest percentage (69%) of germination was achieved from decoated seeds treated with 10mg/L GA3 and germinated on Filter Paper Bridge. And for embryo culture mature embryos were inoculated on MS medium containing various combination and concentrations of cytokinins (BAP, Kn and TDZ) and auxin (IAA and NAA) for rapid conversion into a plantlet. Among the different combinations of growth regulators; highest frequency (100%) of plantlet conversion was obtained on MS medium containing Kn (1.0mg/L) and NAA (0.2mg/L).
The influence of phosphogypsum (a waste product of phosphoric acid production), on the activity of Desulfotomaculum ruminis bacteria in a lactate medium was tested. In order to establish the optimum conditions of the reduction of sulphates present in the phosphogypsum, the influence of the concentrations of phosphogypsum, organic substrate and inoculum in the medium on the degree of conversion was studied. It has been shown that phosphogypsum present in the medium at a concentration of up to 20 g/dm3 is not toxic towards the bacteria and can be used as a source of assimilative sulphates. In the optimum conditions of the process (the concentrations of phosphogypsum 10g/dm3, lactate 20.32 g/dm3, inoculum 4%v/v) the conversion of sulphates to sulphides after 7 days reaches over 92%.
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