its a special type of grinder used in waste water treatment plant to reduce the size of the particles in the raw waste water.
Filtering the waste water through sawdust will remove large pieces of solid matter (such as grit, paper etc).
NO, it is Windex
water treatment plant
A lot of treatment of sewerage and waste water uses organic means however mechanical and filtration systems are also used.
in most modern cities it goes to a treatment plant. from there the water is used for deverse purposes.
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Unprocessed, no. There are however, several waste treatment plants which convert raw sewage into water and a filth-free mud which can be used as fertilizer.
Human waste is heavier than water, so it sinks to the bottom. Then, the water is pumped through a pipe leaving the heavier substances behind, and the waste is disposed of.Hope this helps. :)