Electrochemical cleaning of soils with different concentrations of oil pollution using a single source of electrical voltage

The most essential scientifific and practical task in the area of ecological safety of pipelines operation is the development and improvement of methods of purifification and restoration of oil-contaminated soils. One of the most effificient and cost effective methods is electrochemical purifification, that does not require the use of expensive chemical reagents and soil excavation. However, the consideration of non-uniform contamination of various soil sections is required. The article examines the features of the organization and technological infrastructure for electrochemical purifification of non-uniformly contaminated soils when using a single electrical energy source, a method for calculating the design parameters of the corresponding installation is proposed. Effificient purifification of non-uniformly contaminated soil when using a specifified voltage is possible through the use of different-sized electrodes. For each soil type, the amount of transmitted electric charge required for soil purifification is determined by the concentration of the contaminant. Allocation of cathodes and anodes as parallel batteries and their connection using individual buses is an effective and energy-effificient solution, since an almost-uniform electric fifield is created in an inter-electrode space, thus allowing the reduction of the interelectrode resistance of the medium.

Research on Cathode Chronopotentiograms and Interelectrode Resistance during Vacuum Boiling Electroforming

Studies have showed that the electrolyte vacuum boiling electroforming process can significantly improve surface quality and microstructures of the deposited layer. To explore the mechanisms that produce the above-mentioned favorable improvements, this paper focused on analyzing the change characteristics of cathode potential and interelectrode resistance carried out under different process conditions. Research results showed that, reducing vacuum degree or increasing cathode surface temperature result in an intense fluctuation in the cathode chronopotentiometry and interelectrode resistance; decreasing the vacuum degree causes the whole cathode chronopotentiometry to shift negatively, but situation is opposite when the cathode surface temperature rises.