Waste Water Engineering
During preliminary treatment of a sewage

Oil and grease are removed from skimming tanks
Floating materials are removed by screening
Girt and sand are removed by girt chambers
All listed here

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Waste Water Engineering
The sewers

Must be laid at least 2 to 3 m deep to collect /water from the basements
Must be of adequate size to avoid over flow
All listed here
Must flow under gravity ½ to ¾ full

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