Research of sewage intake of small settlements during the period of rain and snowmelt

Abstract

Introduction. The coefficients of uneven receipt of waste for settlements with a population of 1000 people used in the design practice, as determined in the process of analyzing the literature data, differ greatly in values, which can lead to significant errors in the calculations in the design of head wastewater treatment plants. At three sites located in the Leningrad Region, wastewater discharge measurements were carried out. Earlier, irregularity coefficients for wastewater in the dry season were determined and a mathematical relationship was proposed to describe fluctuations in the daily irregularity coefficient of wastewater during the year. The authors continued to work towards determining the irregularity coefficients for settlements with a population of 1000 people. Information on irregularity coefficients in the period of rainfall and snowmelt for two objects is given. Materials and methods. To measure the daily flow of municipal wastewater in the village of Bolshaya Dvor and the village of Tsvylevo, Leningrad Region, flow meters ERRAYM ERSV-540F V flow meters were used. A sample of the values corresponding to rainfall and snowmelt was compiled using the available weather archive from 15.12.2016 to 14.12.2017, determined the corresponding coefficients of daily irregularity of wastewater costs. A comparison of data of various objects. Results. The dependence of the daily irregularity coefficient of the snow melting period on the average air temperature is proposed. Results are given on the effect of precipitation and the duration of the preceding drought period on the daily irregularity coefficient during rainfall. Conclusions. The previously developed method for determining the estimated wastewater costs for small objects with a population of 1000 people has been added.