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Desalination of reactive yellow 85 by nanofiltration

100%

Mikulášek P. , Kopecký V.

tom Vol. 31, nr 3-4

187-198

Three types (Desal 5 DK, Desal 5 DL, PES 10) of nanofiltration membranes were tested to evaluate optimal operating conditions for flux values and salt rejection in the separation of reactive dye/salt mixtures. Effects of pressure and feed composition on the separation were investigated. Experiments showed that feed composition had a significant effect on flux values. The Donnan effect was greatly responsible for salt rejection. Of the membranes tested one membrane was chosen and batch diafiltration at constant pressure and constant volume was performed through a chosen membrane. The main purpose of diafiltration experiments was to measure the dependence of the amount of the salt removed and the concentration of the salt in feed on time. This experiment was carried out in a dynamic cell.

Precipitation of heavy metals from industrial wastewater by Desulfovibrio desulfuricans

38%

Kosińska K. , Miśkiewicz T.

tom 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%.