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2 2021

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Backfill of a Mined-Out Gold Ore Deposit with the Cemented Rubber-Cord and Waste Rock Paste: Environmental Changes in Aqueous Media

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Danilov A. , Korelskiy D. , Matveeva V. , Horttanainen M.

Journal of Ecological Engineering

2021

tom Vol. 22, nr 7

190--203

Assessment of the dynamics of changes in the physical and chemical properties and morphological composition of the filling mixture as well as the identification of the elements capable of migrating into the environment is an important part of assessing the environmental efficiency of such an environmental measure during the filling of mined-out space of an ore deposit. During scientific research, the environmental safety mined-out space filling technology at the gold ore deposit by the mixture of rock waste, cement and crushed car tires was investigated. The authors carried out a set of laboratory studies and created a physical model of groundwater infiltration. Under laboratory conditions, this model allowed the experiment to evaluate the migration of elements and substances from the filling mixture into the environment to assess the risks of secondary pollution. The potential hazard of element migration from the backfill mixture into the environment was determined as a result of testing the backfill mixture on a bench with washing using the model solution that emits drainage water. During research, it was revealed that under the conditions of an ore deposit, the filling mixture components transformation would not lead to hazardous hydrochemical and hydrogeochemical areas or pollution stream formation.

Purification of Oil-Contaminated Wastewater with a Modified Natural Adsorbent

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Chukaeva M. , Zaytseva T. , Matveeva V. , Sverchkov I.

Ecological Engineering & Environmental Technology

2021

tom Vol. 22, iss. 2

46--50

Water purification from oil and oil products is the final stage of its preparation before injection into the oil reservoir. Natural sorbents are preferred over synthetic ones for use on drilling platforms. They have minimal negative impact on the environment as well as constitute renewable and biodegradable resources. Several adsorbents, based on various natural materials, which could be potentially used for wastewater treatment systems on drilling platforms, were selected. Comprehensive studies of natural sorbents were conducted to determine the possibility of their use as a filtration material for wastewater treatment from oil and oil products on the drilling platforms. As a result of laboratory studies, it was found that the most promising solution is the use of several types of nut shells, which showed the best ratio of abrasion resistance and adsorption characteristics. Among the studied shell samples, pecan shells showed the highest oil product adsorption. As a result of the temperature treatment of the sorbent, it was possible to increase the value of oil products adsorption twice and the value of adsorption activity by almost 13 times without reducing the strength characteristics. It was found that it is advisable to carry out carbonization at a temperature of 400°C.