In older plants and those receiving variable loadings, trickling filter beds are used where the settled sewage liquor is spread onto the surface of a bed made up of coke ( carbonized coal ), limestone chips or specially fabricated plastic media.
2.
In addition, if you look at an old map of Moscow in 1952, it is clearly seen that in place of the unfinished hospital were then stream ( river Likhoborka ) and wetlands, as well as the settled sewage resort facilities located nearby.
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