We had an opportunity to visit the waste water treatment facility in Viikki, Helsinki.
Waste water treatment process starts with sand and big particles removal
Some examples of the stuff people have flushed down the sewers
Good example of the "not-belonging" stuff is butt-plugs...
Mechanical grids are picking up unwanted things from the waste water
Primary sedimentation and thickening
All of the process is done underground
Oxygen is added to the process so the bacteria can eat the waste
Final cleaning is done with bacteria before the cleaned water is pumped to sea
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