International Scientific Journals
of Scientific Technical Union of Mechanical Engineering "Industry 4.0"

A sample of acid drainage waters generated after rainfall in a dump of low-grade copper ores and mining wastes was tested under laboratory conditions to combine the treatment of such waters with the subsequent generation of electricity. This combination was possible and efficient due to the fact that the same microorganisms participated in both processes, i.e. in the water treatment and in the electricity generation. These microorganisms were heterotrophs related to two main groups: of sulphate-reducing and iron-reducing bacteria. These bacteria were anaerobes, with efficient growth and activity at pH within 3.0 – 3.5 using the organic donors of energy and avoiding the precipitation of the trivalent iron

Bioremediation is the enhancement of live soil organisms as fungi, bacteria and plant to break down hydrocarbon and organic contaminants. For achieving the bioremediation method one took soil samples with different concentrations of petroleum products, from different parts of the petroliferous exploitation Suplacu de Barcau. Out of these collected soil samples, the microorganisms were isolated and analyzed all their characters and for identification were used the Galleries API 20E, 20NE and 20Strep. The obtained pure cultures were tested on agar media enriched with different concentrations of crude scaffolding oil, as the sole source of carbon. The bacteria that were validated in this study constituted then the bacterial consortium used for bioremediation. This consortium was applied on polluted soil with initial different TPH concentration. Regarding the initial concentration of mineral oils and extractable petroleum products, this varies in a very large range but during the whole bioremediation process, one noticed a decrease of the petroleum products concentration.

Diesel fuels are unstable on storage. Instability is caused by chemical and microbiological processes. The chemical processes related to the formation of asphaltenes. Microbiological processes associated with the formation of molds, fungi, bacteria. They all cause damage to the engine, in particular in the food system. The article shows the check you of diesel fuels used agricultural machinery for the presence of chemical and microbiological contaminants.