LOST PLACES | Wastewater treatment plant. DDR Stralsund Germany
Channel: Otto el piloto
Date: 2020-08-14

Activated sludge reactors are technologies for biological treatment of wastewater. This type of units have been implemented in many parts of the world and consists of using bacteria to treat wastewater. The bacteria grow in this type of facility and feed on the organic matter and other pollutants present in the wastewater maintaining their respiration through a series of aerators that are placed inside the reactor and thus allow oxygen to be carried into the water column.

The biomass of bacteria that is generated in this type of reactors, forms microbial flocs that are suspended in the water column. These flocs are removed from the water in units called settling tanks. They are also known as secondary settlers since the removal of this suspended material corresponds to a secondary wastewater treatment (removal of the flocs by sedimentation) within a water treatment sequence called “Treatment Train”.

This video shows an old wastewater treatment plant located in the city of Stralsund (minute 1:09). This currently abandoned facility maintains some former treatment units, such as a possible activated sludge reactor (minute 1:53) as well as a settling tank (minute 2:57).
Thanks to these types of sites it is possible to take a look at the past and try to reconstruct how wastewater treatment techniques used to be.
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