yesterday we went on an excursion. first, we visited an old ehgraben in züri niederdorf, which is a small trench between rows of houses which was used to dispose of feces during the middle ages. nowadays one can visit it and read the provided information panels. afterwards, we proceeded to the lindenhofkeller, containing celtic, roman and medieval remains.
afterwards, we continued to the sewage treatment center in werdhölzli, zürich. we had a guided tour through the process of treating waste water from the zürich region and its conversion into “clean” water. certainly very interesting! it is also interesting to see what kind of stuff the mechanic filtering finds. among toys, dentures and mobile phones one can find base stations for mobile phones, credit cards, cash, id cards, remotes, pocket calculators, etc. quite amazing.
finally, in the evening, we had a barbecue.