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Wastewater Temperature Decrease in Pressure Sewers

The centralization of wastewater treatment in large central treatment plants and the connection of sparsely populated areas to sewerage systems have increased the time wastewater is retained in sewers. These retention times lead to a decrease in wastewater temperature and affect wastewater treatment, especially the removal of nitrogen. In this study, temperature changes in long transfer sewers were examined. The temperature change was greatest at the end of winter and in the front part of the sewer. Temperature changes in the front parts of the sewers ranged from 0.16 to 0.27°C/km, and in the end parts from 0.02 to 0.10°C/km. When expressed in terms of the retention time for wastewater in the sewer, the temperature changes ranged from 0.12 to 0.17°C per retention hour.