Browsing by Author "Hlebarov G."

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    Copper phytofiltration and sulfates removal from aqueous media in subsurface vertical flow wetland by Phragmites australis
    (2018-01-01) Lavrova-Popova S.; Hlebarov G.
    Study on the simultaneous copper phytofiltration and sulfates removal from aqueous media in subsurface vertical flow wetland by hydroponically planted Phragmites australis was carried out. The system operated continuously in recirculation regime and the recirculation was performed at ratio of 1:3, giving 1 h water movement through the wetland body and 3 h resting period of the water in the wetland (contact between water and bed matrix). The water flow rate was 50 ml min-1. The effluents were daily analysed for copper and sulfates content and after the experiments, plant samples from the Phragmites australis roots and above-ground parts were extracted for copper content determination. The experiments were carried out during two seasonal periods - winter and spring. In the winter season, the treatment process was embarrassed and the Cu2+ removal efficiency was 1.4 times lower than that achieved in the spring. SO4 2- removal efficiencies of 29.6±2.1 % and 41.9±2.2 % were achieved in the winter and spring season, respectively. The copper concentration in the plant roots increased as a result of the treatment process and the accumulation factor in winter was 4.9 % and 12.4 % in spring. The concentration of Cu2+ in the roots was 4 times higher than that in the above-ground parts.
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    Dynamics of surface water pollution caused by open pit mining in copper concentrate production
    (2016-01-01) Hlebarov G.; Kozarev N.
    The dynamics of surface water pollution around an open pit obtained in the course of pyrite and chalcopyrite mining is studied. The data referring to the water quality in a small river including pH, the river flow rate and the concentrations of Fe3+, Cu2+, Mn2+, SO42- and NO3- is obtained. The influence of the rainfall and snowfall on the surface water pollution is analysed and discussed. Polynomial models of the river flow rate and water pollutants emission are offered. They can be applied to control the water treatment plant operation.
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    Simultaneous removal of Cu2+ and So4 2- using Ba2+- modified clinoptilolite from aqueous medium
    (2018-01-01) Lavrova-Popova S.; Hlebarov G.
    Study on the simultaneous removal of copper cations and sulfate anions from aqueous medium using modified clinoptilolite, has been carried out. The influence of several physicochemical parameters such as the initial ion concentration in the aqueous solution, the clinoptilolite mass, the contact time, and the rate of the system agitation was investigated. It was found that only 19.2 % of the sulphate anions have been removed using unmodified clinoptilolite, while with modified clinoptilolite a 4-fold higher removal efficiency (69.7 %) has been achieved. Reverse effect in the copper cations removal was observed. The removal efficiency of 93.9 % was achieved using unmodified natural clinoptilolite, while with Ba2+ modified clinoptilolite it was 88.3 %.