Change of Liquid Waste Temperature in Open Wastewater Treatment Plants

Abstract

AbstractThe issues of changing the wastewater temperature are considered. It is established that the wastewater temperature is influenced by climatic parameters, namely, the outside air temperature, wind speed, relative humidity and atmospheric pressure. The studies’ results on the open-type site of wastewater treatment plants with 27 thousand m3/day capacity are presented. The results highlight how much the water temperature changes during the winter and summer periods of the year. Based on the statistical data, obtained during the collection at wastewater treatment plants, a cluster analysis was performed to identify natural groupings in the data set, hypotheses about the equality of the average values of parameters in the obtained clusters were tested, and a step-by-step multi-factor regression model was constructed. The result of the study shows that atmospheric pressure does not affect the extent that it is taken into account, predicting the wastewater temperature for the selected site of wastewater treatment plants. However, the most influential factor was the wastewater temperature, as it was established during the analysis and construction of regression models. Unfortunately, today, designing wastewater treatment plants, the change in the wastewater temperature during its treatment is not taken into account, and the temperature entering the receiving chamber is taken as the calculated one. The obtained models make it possible to predict the temperature and, respectively, give an opportunity to determine the wastewater quality when it changes.KeywordsPrimary tankAerotankLiquid WasteTemperatureCleaning quality