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Chromium is widely used in the form of metal and in the form of compounds. The compounds of Cr(VI) are highly toxic. Therefore, the wastewater containing chromium must be thoroughly cleaned by sorption, extraction, electrochemical and biochemicals methods. Methods based on the reduction of Cr(VI) occupy an important place. A large number of reducing agents, including FeSO4, has been proposed for this. Studies carried out earlier showed that during this reaction a magnetoactive compound is formed. Lignosulfonic aci...

In the paper the precipitation of arsenic and iron from an acid drainage water of the Berikul mine wastes by using lime milk, NaOH, and Na2S were studied. The wastes were stored in the southern part of the Komsomolsk tailings impoundment, near the Komsomolsk settlement (Kemerovo region, Russia). The interaction of natural waters with the wastes produced ultra-acid drainage with a pH of about 2, with arsenic content of 1.3 g/l and iron - 6.5 g/l. The results of in situ experiments showed that adding lime milk and s...

Speciation of heavy metals in bottom sediments defines their ecotoxicity and mobility and therefore needs to be studied thoroughly. Usually single and sequential extraction techniques are used to determine water-soluble, exchangeable, specifically sorbed and carbonates, bound to organic matter, bound to Fe and Mn hydroxides and residual forms. Bottom sediments of the Vyshnevolotsky reservoir (the Upper Volga, the Central region of Russia) were chosen for the research. Lithological and mineral composition of sample...

Passage form the idea to market is a long journey, which if it is appropriately planned, may bring satisfaction and success. On the other hand, implementation new technology on the market give a risk of grave errors committing at the stage of planning. The procedure of transfer may end with fiasco, even though the concepts were really innovative and interesting. In this paper determinants of geothermal water deironing technology commercialization has been presented. The developed technology has been not breakthrou...

The drinking water demand of most Estonian communities is covered by groundwater abstracted from the sedimentary rocks. Due to the climate and small population, Estonia?s fresh water resources are sufficient. However, Estonia faces a number of problems with natural groundwater quality in some areas. Fluoride concentrations up to 7 mg/l are recorded in western Estonia and deeper portion of the Silurian-Ordovician aquifer system, which consists of diverse limestone and dolomite. Fluorine contents in carbonate rocks ...