Chemical and biological indicators for evaluation of Arctic soil degradation and its potential to remediation

In recent years, significant efforts have been made to accelerate the economic development of the Arctic zone, leading to intense environmental pollution of this region, accompanied by the significant impact of accumulated environmental damage in the region. The solution to these problems is difficult due to the remoteness of these areas and severe climatic conditions. Therefore, it is important to evaluate the potential for restoration of arctic soils. For this purpose, various indicators are used, including biological ones. In the analyzed arctic soil samples, high concentrations of petroleum hydrocarbons (up to 47,000 mg/kg) and chloride-ions (0.10–0.14 wt %) were established. Microbioassay demonstrated a presence of hydrocarbon-oxidizing microorganisms: Penicillium, Azotobacter chroococcum, Bacillus subtilis, Pseudomonas oleovorans. A low enzymatic activity and specific Arctic climate point out a low self-restoration ability of the soil, demonstrated the need for its remediation. The microbioassay with microbial strains identification and soil remediation methods suitable for the Arctic zone were recommended

TECHNOLOGY FOR REDUCING THE VOLUME OF CONCENTRATE ON A MULTI-TURN REVERSE OSMOSIS CYCLE

One of the negative environmental and economic factors in the process of reverse osmotic purification of water flows is the volume of non-recyclable concentrate, which reaches 25 %–35 % of water treatment and sanitation in various processes. The purpose of this study is to experimentally substantiate the technological scheme of cyclic reverse osmosis treatment of mains tap water, firstly, to minimize the impact of non-recyclable concentrate on the environment and, secondly, to achieve the maximum volume of permeate product for further use

TECHNOLOGY OF HANDLING THE CONCENTRATE OF REVERSE OSMOSIS INSTALLATIONS

The use of reverse osmosis membrane plants for water treatment purposes is complicated by the presence of waste concentrates to be disposed of. The article analyzes publications in the field of reverse osmosis concentrate processing. Based on the generated database of the obtained data, it was concluded that the use of coagulants and their joint use for the effective utilization of concentrates was expedient