PROCESSES OF HEAT AND MASS TRANSFER BETWEEN THE LIQUID WASTE AND THE ENVIRONMENT
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Abstract
Abstract. The article is devoted to one of the urgent problems existing in the field of wastewater treatment. It is associated with the deterioration of the wastewater treatment quality of the year for wastewater treatment plants in the most unfavorable periods.
Subject: Such changes are due to the fact that wastewater treatment is carried out in open structures under external climatic factors: temperature, wind, humidity, atmospheric pressure and precipitation.
Materials and methods: The authors of this scientific paper conduct extensive theoretical and experimental researches to study the influence of climatic conditions on the open plants operation for mechanical and biological wastewater treatment. The essence of theoretical research was in-depth study of mathematical models describing both technological and thermal processes occurring in open structures: primary and secondary tanks, as well as aerotanks. Experimental studies devoted to the study of natural factors influence on the actual changes in temperature and quality of treated wastewater were carried out at two functioning facilities, namely: wastewater treatment plants (WWTPs) of the cities of Novosibirsk and Iskitim of the Novosibirsk region. The selected wastewater treatment complexes are located in the same climatic zone, but they differ significantly in performance, and therefore in heat capacity. Experimental studies have been conducted for more than four years and covered repeatedly all seasons of the year.
Results: Experimental studies shown that the temperature of the waste liquid at the Novosibirsk WWTPs during the passage of the main structures in the cold season is less cooled than at the Novosibirsk WWTPs, Iskitim. In the summer, the wastewater at the Novosibirsk WWTPs warms up more than at the Iskitim plants.
Conclusions: Our research results make it possible to exclude deterioration in the quality of wastewater. As well, as the results were used to develop a software package designed to help designers and operational personnel and to analyze and predict the operation of wastewater treatment plants.
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References
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