PROCESS OF CLEANING OF AREA OF CONTAMINATED INHOMOGENEOUS GROUND Russian patent published in 2001 - IPC

FIELD: cleaning of ground. SUBSTANCE: invention is related to process of cleaning of area of inhomogeneous ground of undisturbed structure contaminated with various organic and inorganic contaminants ( heavy metals, oil products, etc ). Cleaning area can carry various types of contaminants of various concentrations and different types of grounds. Area of contaminated inhomogeneous ground is cleaned by way of installation of anode and cathode electrodes into ground, by division of area of contaminated ground into zones according to characteristics of ground and by supply of proper D C voltage to each zone. Area of contaminated ground is additionally divided into zones according to concentration and/or type of contaminant, volume V_g of ground subject to cleaning in each zone is found, electric charge Q_g required to be passed through each zone to obtain needed degree of cleaning is determined from relation Q_g= q_g•V_g, where q_g is specific charge needed to clean unit of volume of ground in given zone. Intensity E of electric field is maintained in each point of cleaned area as E ≥ V/cm, value of electric charge Q_фg which actually passes through each zone in the course of time t elapsed from start of cleaning is controlled by relation , where I_(t) is value of electric current passing through cleaned zone. Transmission of electric current is stopped with achievement Q_фg= Q_g. For cleaning fine-porous grounds value q_g is found from relation q_g= α•n/k, where α is coefficient equal to amount of pore volumes of moisture which should be removed from cleaned zone; n is porosity of ground; k is specific electroosmotic transfer in given zone. One or more cathode electrodes are installed with inclination with regard to surface of ground; one or more anode electrodes can be installed horizontally near surface of ground. Electric insulation coat is deposited on surface of ground. Mass of anode electrode installed in each zone is determined from condition M_g≥ 2Q_g•γ, where M_g is mass of electrode installed in given zone; Q_g is electric charge which should be transmitted through given zone to ensure required degree of cleaning; γ is electrochemical equivalent of material of which electrode is made, kg/A h. EFFECT: reduced consumption of electric energy. 5 cl, 6 dwg, 1 tbl