Ecological Systems and Devices Annotation << Back Negative impact assessment of industrial wastewater on water objects and measures to reduce it Asfandiyarova L.R. Daminev R.R. Galiev A.L. Yunusova G.V. It is found that the water quality of natural water sources are random, seasonal and trend components, which can be detected by using time series analysis. To determine these elements were formed sequences representing the time series. We determined the dynamic properties of long-term variability of the river Belaya flow and the evaluation of the quality of wastewater discharged into it. We studied the correlation of water quality changes before and after the discharge of treated wastewater into river Belaya. Monitoring the status of water quality p. White before and after the discharge of treated wastewater was done for the following pollutants: chlorides, sulfates, ammonium ion, oil products, phenols, dissolved oxygen, suspended solids, dry residue, nitrites, nitrates and indicators pH, COD, BOD-5, BOD-20 in the period from 2005 to 2010. Studies performed by analyzing a monthly average, a total number of 14 values per year for 6 years. Was held convolution specified time period to «hypothetical» year, which, in essence, is a model of the annual cycle of the water source. An assessment of the contribution of the trend, seasonal and random component to the overall variability indices. The data obtained allow to split the content before these impurities in the water at three groups. The first group of indicators attributed pH, chloride, COD, ammonium ion, oil products, phenols, dissolved oxygen. The second group of indicators included sulfates, BOD-5, 20, suspended solids, dry residue and nitrate anions, and the third group – the nitrite anion. Keywords: Water quality; water source; time series; pollutants; indicators; trend component. Contacts: E-mail: galievanvar@mail.ru Pp. 14-18.