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Wastewater Irrigation Impacts on Soil Hydraulic Conductivity: Coupled Field Sampling and Laboratory Determination of Saturated Hydraulic Conductivity

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Published on: August 19, 2018

Wastewater temperature decrease in pressure sewers.

Jarmo Sallanko¹, Mari Pekkala

¹Water Resources and Environmental Engineering Laboratory, University of Oulu, Finland. jarmo.sallanko@oulu.fi

Water Environment Research : a Research Publication of the Water Environment Federation

|January 17, 2009

Summary

Wastewater retention in sewers lowers temperature, impacting nitrogen removal. This study quanties temperature changes in long sewers, finding significant drops, especially in colder months and at sewer inlets.

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Area of Science:

Environmental Engineering
Water Quality Management
Wastewater Treatment

Background:

Centralized wastewater treatment and expanded sewerage systems increase wastewater retention times in sewers.
Extended retention times lead to decreased wastewater temperatures, negatively impacting treatment efficiency, particularly nitrogen removal.

Purpose of the Study:

To quantify temperature changes in long transfer sewers.
To assess the relationship between sewer length, wastewater retention time, and temperature variations.

Main Methods:

Monitoring temperature changes along long transfer sewer lines.
Analyzing temperature data in relation to sewer sections (front vs. end) and seasonal variations (end of winter).
Calculating temperature changes per kilometer of sewer and per hour of wastewater retention.

Main Results:

Temperature changes were most pronounced at the end of winter and in the front sections of the sewers.
Temperature changes in front sewer sections ranged from 0.16 to 0.27 °C/km.
Temperature changes in end sewer sections ranged from 0.02 to 0.10 °C/km, and 0.12 to 0.17 °C per retention hour.

Conclusions:

Wastewater temperature decreases significantly with increased retention time in long sewers.
These temperature fluctuations can impact the biological processes in wastewater treatment plants.
Understanding these thermal dynamics is crucial for optimizing nitrogen removal in centralized systems.