Sewage goes round the S-bend into the septic tank . THe solid settles down intot he bottom of tank and the liquid overflows into a mansoon drain .
Dangers in sewer chambers
Suffocation due to lack of oxygen , poisoning caused by inhalation of toxis gases . Some examples of confined space are sewers , manholes , chambers , wet and dry wells , sewage and sludge tanks , spetic tanks , tanker barrels , air filter houses , chamical storage tanks .
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