Rainfall parameters for the design of surface water treatment facilities

Abstract

Summarized data is presented on the maximum rainfall layer, runoff from which should be completely diverted to treatment facilities (runoff from residential areas and industrial enterprises of the first group in the Russian Federation). The calculated values of the precipitation layer are obtained from observations at 238 weather stations located in the Russian Federation, which are necessary for calculating the performance of surface water treatment plants. The results can be used in the design in areas for which these weather stations are representative. The size of the precipitation layer, which ensures the discharge of at least 70% of the annual volume of runoff to sewage treatment plants, for the territory of the Russian Federation is in the range of 2.2–12.8 mm.

Selection of the Optimal Reagent for Low-Turbidity Water Treatment at High Permanganate Oxidability

“…Usually, the maximum difficulties in coagulation occur in flood time, characterized by a sharp increase in the amount of pollution at still low water temperatures of the source. Achieving the required degree of water purification is ensured by the use of high doses of a coagulant -aluminum sulfate, which leads to an increase in the concentration of aluminum in drinking water [18][19][20][21].…”

“…Over the past few years, a significant increase in organic pollutants has been observed in the waters of the Saratov reservoir, one of the reasons for which, as was shown in [3][4][5][6][7][8][9][10][11][12], is the intake of untreated surface wastewater, the quality of which has seasonal fluctuations [13]. At the same time, such indicators as turbidity and the concentration of suspended substances are sharply reduced.…”