Application of ground-based research methods for the diagnostics of pollution and eutrophication of water reservoirs of the Kirov region
Т.I. Kutyavina, Т.Ya. Аshikhmina, L.V. Kondakova
Section: Methodology and research methods. Models and forecasts
The status of the four largest reservoirs of the Kirov region was assessed using a set of methods for physicochemical, bioindicative and microbiological analyzes. The combinatorial index of water pollution (CIWP), the specific combinatorial index of water pollution (SCIWP), and water quality classes are defined. It has been established that in terms of chemical indices CIWP decreases in the series: Bol’shoye Kirsinskoye → Omutninskoye → Chernokholunitskoye → Belokholunitskoye reservoirs. It has been shown that ammonium nitrogen and organic substances make the largest contribution to the pollution of reservoirs. The maximum permissible concentrations for reservoirs of cultural and domestic use (MPCc-d.) for total iron (from 2 to 9.5 MPCc-d.) are exceeded in all objects of study, in the Bol’shoye Kirsinskoye reservoir – on bichromate oxidation (COD) (1.6–1.7 MPCc-d.). In the Omutninsky reservoir, indicator plants for the presence of organic pollution were found – Typha latifolia L. and Рotamogeton natans L., which is consistent with the COD value (53 mgO/dm3). It is established the positive reaction of Lemna minor L., L. trisulca L., Spirodela polyrhiza (L.) Schleid. to the increased content of ammonium nitrogen in the place of sewage discharge into the Omutninsky reservoir, where the ammonium content was 2.1 times higher compared to other parts of the reservoir.
Based on the microbiological analysis of the water of the Omutninsky reservoir, the mesosaprobic zone of the reservoir (central and dam sections) was detected, as evidenced by the ratio of biological oxygen consumption during 5 days to permanganate oxidation (an average of 27%).
Keywords: reservoir, water pollution index, saprobity, eutrophication, phytoindication
ISSN 1995-4301
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