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Zero-valent iron for removal of inorganic contaminants from low pH water

Suponik T.

Environment Protection Engineering

2015

Vol. 41, nr 1

15--27

The coal mine waste dumps located in the southern provinces of Poland pollute groundwater with metals. As a result of batch experiments presented in the paper, it can be said that it is possible to remove chromium and copper from the groundwater (which is affected by acid mine drainage, thus characterized by low pH) with the use of zero-valent iron in permeable reactive barrier technology. The contaminants are removed from the aquifer by the flow of groundwater through a reactive barrier filled with a special reactive material. Rapid metal removal likely occurred due to the reduction and the precipitation/co-precipitation and/or due to the adsorption onto the iron metal surface or/and onto the iron corrosion products. In accordance with the research it has also been found that in more alkaline environment, the oxidation of Fe(0) proceeds slower. A rapid decrease of the redox potential as well as the increases of pH have also been observed in the batch tests when the dose of Fe(0) in solutions increased.

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%.

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

2011

Vol. 37, nr 4

143-161

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.