SANITARY AND MICROBIOLOGICAL ASSESSMENT OF BIG TALDYKOL AND ZHALTYRKOL LAKES

Abstract

Hydrochemical, bacteriological, and parasitological parameters were studied in Big Taldykol and Zhaltyrkol lakes: pH, suspended solids, oxygen conditions (dissolved oxygen, BOD5, COD); mineralization (dry residue, chlorides, sulfates, total hardness, total alkalinity); biogenic substances (phosphates, ammonium nitrogen, nitrites, nitrates, boron); metals (iron, copper, chromium, nickel, zinc, manganese, molybdenum); organic substances (fluorides, synthetic surfactants, oil products). According to the results of hydrochemical analyses Big Taldykol Lake belongs to the sixth class of water quality, where high value of COD 42.8 mg O2/l, suspended solids - 46.0 mg/l, total iron 0.83 mg/l were observed. In Lake Zhaltyrkol suspended solids were 18.62 mg/l, so Lake Zhaltyrkol also belongs to the sixth class of water quality. According to other indicators in the lakes there is no toxicological hazard. The excess of a number of components may be related to the natural xenobiotic profile of the environment. According to the results of bacteriological studies, the content of lactose-positive Escherichia coli and coliphages did not exceed permissible levels. According to the results of parasitological studies, no viable eggs of ascarids, vlagoslav, toxocaria, fasciola, oncospheres of tennidae, or cysts of pathogenic intestinal protozoa were found in the water of the lakes. A large number of infusoria, rotifers, and gastrotrichia, along with the dominance of diatom algae, indicate eutrophication of the water body and a high risk of water blooms.