COMPREHENSIVE RECULTIVATION OF SOILS OF THE PAVELTSEVSKAYA TANK FARM

Abstract

Relevance. Quaternary (QII–IV) deposits are represented in geological structure of the investigated section within a depth of 20,0 m: cover, lake-glacial, fluvioglacial, sandy-argillaceous Dnieper-Moscow interglacial; Morainic clayey of the Moscow and Dnieper stages of glaciation; fluvioglacial sands of the Oxo-Dnieper interglaciation. These primers composing Paveltsevskaya tank farm pad (Dolgoprudny Moscow region) operating since 50-s of the XX century, are contaminated to a greater or lesser extent with petroleum products and heavy metals (lead, copper, zinc, cadmium, nickel). Owing to spills the oil products have leaked into the ground and reached the groundwater level (5,5–6,5 m) and formed in the areas of spreading lenses and interlayers of sandy soils of varying size in the clay thicker the floating lens of a mixture of gasoline and diesel fuel with output power of 0,2 up to 0,4 m. The significant pollution with oil products of the Bezymyannaya river water was found out. The river forms the pond before flowing into the Klyazma reservoir. The pond adjoins to the tank farm territory that can be related to discharge of oil product lenses into the pond. The aim of the research is to develop an optimal scheme of remediation of oil-contaminated quaternary sand-clay soils forming the platform of the Paveltsevskaya tank farm based on the results of geological and engineering and environmental studies, including laboratory geochemical studies. Methods: geotechnical studies of soils – drilling wells, laboratory geoecological studies of soil samples, monitoring of groundwater level, determination of the effect of biological preparations on degradation of oil products and humic preparations on the mobility of heavy metal ions in soils, ground waters of an overmoist aquifer in fluvioglacial piano- argillaceous sediments Dneprovsko-Moscow interglaciation and groundwater podmorennogo (nadyurskogo) aquifer during flyuvioglacial sandy deposits of the Oka-Dnepr Interglacial. Results. The authors have proposed the scheme for complex remediation of contaminated soils at the site of the Paveltsevskaya tank farm, including pumping out lenses of petroleum products, immobilization of heavy metals in soils using humic preparations («Energen Extra»), destruction of petroleum products by biological preparations (BIOIL-AA, FBUN SSC VB «Vector»; Novosibirsk) and installation of a hydraulic curtain (drainage). Implementation of the proposed scheme will allow extracting petroleum products, immobilizing heavy metals in the surface layer of the soil, reducing considerably the content of petroleum products in it and the flow of petroleum products from the aeration zone of the Paveltsevskaya tank farm into the basin of the Bezymyannaya river in the groundwater discharge zone.

Keywords

• tank farm
• soil contamination
• oil products
• heavy metals
• remediation
• humic preparations
• biological products
• lenses of oil products
• hydraulic curtain