Relationships between thermal stratification in a secondarily treated wastewater reservoir that stores water for irrigation and filter clogging in the irrigation system

摘要

We studied particle distribution in relation to thermal stratification development in a secondarily treated wastewater reservoir, to learn about changes through the irrigation season that would affect the efficiency of removing water from different depths to avoid filter clogging. During an irrigation season a datalogger continually recorded temperature at 12 depths of the water column and manual measurements of the water clogging potential were carried out at relevant depths. The datalogger allowed following the development of thermal stratification, which was established during April with a 4-4.5 m deep epilimnion. The epilimnion depth did not change during the irrigation season. Particles accumulated at the bottom of the epilimnion.