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Precipitation of heavy metals from industrial wastewater by Desulfovibrio desulfuricans

Kosińska K., Miśkiewicz T.

Environment Protection Engineering

2012

Vol. 38, nr 2

51--60

Wastewater from leather tanning, electroplating, organic dye production and non-ferrous metallurgy was treated in a batch anaerobic bioreactor of the total volume of 2.7 dm3 using Desulfovibrio desulfuricans for the removal of Crtotal, Cu(II), Fe(II), Ni(II) and Zn(II) as metal sulfides. Except the tannery effluent, the wastewater samples were supplemented with an appropriate quantity of swine manure in order to enrich them with simple organic compounds and biogenic elements (N and P), and thus upgrade the sulfate reducing activity of D. desulfuricans. The metal removal efficiencies obtained varied from 85.2% to 98.96%.

Electric properties of fiber forming polymers modified with metal sulfides

Koprowska J., Kacprzyk R., Zawadzka-Michalak L.

Polish Journal of Chemical Technology

2006

Vol. 8, nr 3

87-89

Electro-conductive fibers can be obtained in numerous ways. The surface modification of fiber material is one of such methods. The subject of the research were electro-conductive polyacrylonitryl fibers, which were modified with semi-conductive copper and silver sulfides in the finishing process. The method, consisting in coordinative binding of the above-mentioned chemical compounds with the fiber forming polymer was developed at the Textile Research Institute in Łódź. This paper shows the results of the tests that allow to determine that the probable dominating conductivity mechanism of the specified fibers is the electron mechanism. The conclusions concerning the conductivity mechanism of polyacrylonitryl modified with copper and silver sulfides were based on the measurements of resistance and the thermoelectric power. The values of the determined Seebeck's coefficient for the above-mentioned group of materials were at the level of α = 8 - 12 žV/deg for average temperature in the 310 - 330 °K range. The researchers stated that the coefficient depends on the temperature. Both the values and temperature dependencies of the α coefficient show that it is mainly the charge carriers with energies close to the Fermi's level (metallic conductivity) that are responsible for the electric conductivity.