Waste of the zinc-contain galvanic solutions generated at a large number of industrial enterprises is one of the most dangerous ecotoxicants. The paper presents the results of testing the corrosion, salt deposition and biofouling inhibitor Na4[Zn{N(CH2PO3)3}]·13H2O, obtained from galvanizing plants waste, for algicidal activity against Chrysococcus rufescens, Nitzschia biacrula and Melosira varians. In the river water sample, single algal cells of two species were found: Cyclotella menenginiana and Chrysococcus rufescens. In water samples from the circulating cooling system, the number of algal cells significantly exceeded the number of cells in the river water. After the inhibitor was introduced, a decrease in the diversity of Bacillariophyceae species from 18 to 9 was observed, as well as a decrease in the total number of algae. Melosira varians and N. biacrula remained dominant species, but their number decreased by 2 times. After 3 days of inhibition, the total content of algae decreased by 17.4%. It has been established the studied reagent has the greatest algicidal activity to C. rufescens: a 65% decrease in the number of cells was recorded within three days of the reagent action with a concentration of 5 mg/dm3. It was determined that iron and copper in the river water and in the cooling system remained virtually unchanged, which confirms the properties of the studied complex as a corrosion inhibitor. The ability to use one reagent instead of several commonly used ones (corrosion inhibitor, antiscale agent and bactericide) without reducing the efficiency of water treatment allows for a reduction in the costs of maintaining the water chemistry regime of the thermal power plant’s circulating cooling system.
ISSN 1995-4301
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