Home – Home – Jornals – Chemistry for Sustainable Development 2017 number 2

An opportunity for bioremediation of ground water polluted by oil products through a system of observation wells was studied. The activity of bioremediation processes was assessed by a change in the content of nitrogen (ammonia, nitrate, and nitrite) in water, the number of aerobic and anaerobic microorganisms and oil products. Microbial growth was stimulated by the introduction of mineral fertilizers into ground water as sources of N and P. Prior to treatment, the number of ammonifying and hydrocarbon oxidizing microorganisms in water collected from wells at polluted sites did not exceed 10⁵ CFU/mL and 10³–10⁵ CFU/mL, respectively. In response to nutrients feeding that limits the growth, the number of aerobic microorganisms increased by 3–4 orders. The number of ammonifying microorganisms increased to 1.8 × 10⁸ CFU/mL, hydrocarbon oxidizing — 2.3 × 10⁷ CFU/mL. An increase in the concentration of ammonia nitrogen (to the values above 50 mg/L) happened in ground water with delay of 2–6 weeks. Dynamics analysis of the chemical composition of ground water by the data of all wells demonstrated that a concerted fluctuation of the activity of nitrification and denitrification processes proceeded in oil products biodegradation in the active phase, and accordingly, of ammonium and nitrate concentrations. Predicting the chemical composition of ground water using a neural network confirmed the same. The content of oil products in ground water decreased by 65–97 %.