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Vol. 20 (2017 year), No. 1, DOI: 10.21443/1560-9278-2017-20-1/2

Il'inskiy V. V., Kramarenko E. V., Makarevich E. V.
Evaluation of the functional activity of activated sludge from local waste water treatment plant in the Arctic region

The paper considers characteristics of the activated sludge in the local wastewater treatment plant (LWTP) and its ability to purify fully domestic sewage water in the Far North. Biochemical process of destruction of organic pollutants is influenced by a microbial complex functioning in aeration tanks. Taking into account climatic conditions of the region where the organic matter degradation processes are slowed, and lack of control over the operation, efficiency and occupational safety of LWTPs, it seems to be important to study the physiological characteristics of the bacteria used in bioremediation, and their ability to maximize the purifying domestic sewage in the Arctic region. Undue intervention in the biosphere systems leads to disruption of the balance of internal and external ecosystems communications. The goal of research is studying structural determination and functioning of activated sludge bacteriocenosis of LWTP TOPAS-5 (GK "Topol-ECO") in certain physical and chemical conditions of the habitat, and establishing completeness of cleaning process in this treatment plant. The paper considers the structure (quantitative and qualitative composition) and function of LWTP activated sludge bacteriocenosis functioning in the Arctic region. The estimation of the activated sludge of full waste water treatment process of the LWTP has been given. The research's results have allowed to identify and determine the bacterial count of physiological groups of microorganisms purified domestic sewage; to isolate from activated sludge the bioflocculant-producing microorganisms' on the experimental medium; to evaluate efficiency of LWTP work in the Arctic region.

(in Russian, стр.8, fig. 5, tables. 3, ref 7, Adobe PDF, Adobe PDF 0 Kb)

Vol. 20 (2017 year), No. 2, DOI: 10.21443/1560-9278-2017-20-2

Il'inskiy V. V., Makarevich E. V., Kramarenko E. V., Indushko V. V.
Assessment of impact of culture conditions on capability of wastewater's microorganisms to flocculation

Wastewater is one of the significant sources of pollution of the aquatic ecosystems of the Kola North. Sewage coming to the ground waters, surface waters and near shore marine basin have a complex negative impact on the biocenosis of water objects. Considering the fact that basin self-purification process in climatic environment of the Far North is slow, it seems to be current problem to research influence of external factors on the native microorganisms involved in the biological transformation of most pollutants. Along with oxygenizing activity microorganisms are able to accumulate pollutant in the cells and to form floccules. As a result, microorganisms fix the dissolved contaminants that may be mechanically derived from water. Using the data on the chemical makeup of some urban and domestic sewage, nutrient media have been developed where microorganisms isolated from effluents have been cultivated. As major characteristics of the cultivation media affecting the intensity and direction of metabolic processes in microorganisms, the ratios C/N, C/P and N/P have been chosen. Intensity growth of bacteria in experimental nutrient media has been studied and the flocculating activity of bacterial suspensions has been determined. The rate of these microorganisms (Pseudomonas spp. and cultures of bacteria of Enterobacteriaceae family) average has been 70?103 and 117?103 cells/h respectively. The growth rate of each culture on different composition nutrient media has varied within three orders, and has correlated with the relative content of phosphates in the nutrient media. The flocculating potential does not depend on the ratio of biogenic elements C / N, C / P and N / P. Both cultures have shown the ability to precipitate suspended matter at the level of 50 % or more after cultivation on nutrient media similar in composition to habitat conditions.

(in English, стр.7, fig. 3, tables. 3, ref 6, Adobe PDF, Adobe PDF 0 Kb)