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1

Precipitation of heavy metals from industrial wastewater by Desulfovibrio desulfuricans

Kosińska K., Miśkiewicz T.

Environment Protection Engineering

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2012

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Vol. 38, nr 2

51--60

EN

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%.

2

Adsorption of Copper(II) and Zinc(II) ions by various agricultural by-products. Experimental studies and modelling

Turan N. G., Mesci B.

Environment Protection Engineering

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2011

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Vol. 37, nr 4

143-161

EN

Effective removal of heavy metals from aqueous solutions belongs to the most important issues for many industrialized countries. Removal of copper(II) and zinc(II) ions from leaching solution of industrial waste were studied using hazelnut, almond and walnut shells. Batch adsorption experiments were performed in function of pH, contact time and adsorbent dosage. Adsorption kinetics was investigated using the pseudo-first and pseudo-second order, Elovich equations and intraparticle diffusion models. The results indicate that the second order model best describes adsorption kinetic data and the agricultural by products investigated may be used for removal of copper(II) and zinc(II) ions from leaching solution of industrial waste.

3

Microwave regeneration of activated carbon

Dąbek L.

Environment Protection Engineering

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2007

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Vol. 33, nr 2

107-115

EN

Microwave radiation, being more and more frequently applied in environmental engineering, is used lor regeneration of activated carbon, particularly that saturated with organic substances. This paper is concerned with the use of a microwave field to regenerate a spent activated-carbon- supported catalyst for vinyl acetate synthesis, containing both organic substances and zinc compounds. It has been reported that microwave energy applied directly to a spent catalyst removes some of organic substances from its surface. This results in better leaching of zinc compounds by acid solutions. Compared to repeated leaching performed at boiling points of leach solutions, microwave leaching makes it possible to remove more than 90% of zinc compounds in a shorter period of time, using less energy and smaller amounts of solvents.

PL

Energia mikrofal znajduje obecnie coraz szersze zastosowanie w licznych dziedzinach inżynierii środowiska, w tym również do regeneracji węgli aktywnych, głównie nasyconych substancjami organicznymi. W prezentowanej pracy wykorzystano pole mikrofal do regeneracji węgla aktywnego będącego nośnikiem zużytego katalizatora syntezy octanu winylu, w skład którego wchodzą zarówno substancji organiczne, jak i związki cynku. Wykazano, że w wyniku bezpośredniego działania mikrofal na zużyty katalizator z jego powierzchni zostaje usunięta część substancji organicznych, co istotnie ułatwia wyługowanie związków cynku roztworami kwasów. W tych warunkach, wykorzystując ogrzewanie mikrofalowe na etapie ługowania, usunięto z powierzchni zużytego katalizatora ponad 90% związków cynku w krótszym czasie i przy mniejszym zużyciu energii i rozpuszczalników niż podczas wielokrotnego ługowania w temperaturze wrzenia roztworów.