SUBSUPERFICIAL RECOVERY BY BIORREMEDIATION AND AIRATION OF SOILS CONTACHED WITH HYDROCARBONS

In the project "Treatability by biorecuperation in situ of urban soils contaminated with hydrocarbons" Biorremediation is investigated in surface soils contaminated with mixture 1: 1 of gasoline and diesel. In 69 days of treatment, a reduction of total oil (TPH) hydrocarbons of 30.98 %, of which 16.93 % is attributable to evaporation and natural bioremediation and 14.05 % to 14.05 % to stimulated bioremediation (1) .. 58 % of gasoline was separated by evaporation caused by ventilation, 27 % for microbial degradation, 7.5 % were incorporated into recovered water and 6.8 % by uncontrolled evaporation (2). This project has been designed a combination of bioremediation and ventilation and in sampling times water will be added in quantities such that the leachate that drains would correspond to that in a treatment in the field passes to the water table. The results of the project would indicate the proportion of hydrocarbons eliminated by ventilation, bacterial degradation, evaporation and contamination of groundwater. The general objective of the project is to investigate the efficiency of bio -traffic with aeration of contaminated soils with hydrocarbons. The work hypothesis is that by means of biorecuperation and aeration it is possible to increase the remediation of contaminated soils with hydrocarbons. The methodology to be applied consists in taking soil samples corresponding to the subsurface layer in a slope of the Cuenca-Azogues highway, which will be placed in pots. The control for control will be sterilized by heating in the stove at 125 OC for an hour. The soil samples will be contaminated with a 1: 1 mixture of gasoline and diesel to have approximately 7000 ppm of contaminant in all substrates. The following analysis will be carried out in the sample: TPH, heavy metals and nitrogen, phosphorus and potassium (NPK), biorecuperation will be carried out in two substrates and a third control will be maintained. In substrate 1, bioremediation with aeration and addition of complete fertilizer and water solution will be carried out. In the substrate, bioremediation will be carried out with the addition of 2 %hydrogen peroxide, complete fertilizer and water solution. In substrate 3, witness or control, only water will be added in the same volumes as water and solutions added in the other substrates and will be in a similar way as in substrate 1. In the substrates the tremperature, pH and humidity will be monitored weekly, the bacterial population and quarterly TPH and NPK Quarterly physical and bacteriological parameters. According to the monitoring results, adjustments of the addition of fertilizer, moisture and aeration will be made.

III UNIVERSITY RESEARCH PROJECT COMPETITION