Stages of wastewater treatment (at 41.40 minute)
A typical sewage work treats 40,000 m3 of mainly domestic
sewage each day. Rainwater runoff is also treated.
•Preliminary treatment: Screening and Grid removal (42.16
minute)
The incoming waste passes through screens which remove
large pieces of debris, such as plastic, paper and cloth. The liquid then flows through a
number of channels, which take out any grit washed in from roads and hard surfaces. The
raw sewage entering the works passes through a 6mm mesh screen, and the collected solid
matter is called screenings. It typically comprises rugs, cotton pads, sanitary products and
paper. The screenings are compacted and sent to landfill. The sewage then flows into a grit
extractor of the cross flow type, where raw grit and other inorganic matter settleout. This is
subsequently also sent to landfill.
Stages of wastewater treatment (at 41.40 minute)A typical sewage work treats 40,000 m3 of mainly domesticsewage each day. Rainwater runoff is also treated.•Preliminary treatment: Screening and Grid removal (42.16minute)The incoming waste passes through screens which removelarge pieces of debris, such as plastic, paper and cloth. The liquid then flows through anumber of channels, which take out any grit washed in from roads and hard surfaces. Theraw sewage entering the works passes through a 6mm mesh screen, and the collected solidmatter is called screenings. It typically comprises rugs, cotton pads, sanitary products andpaper. The screenings are compacted and sent to landfill. The sewage then flows into a gritextractor of the cross flow type, where raw grit and other inorganic matter settleout. This issubsequently also sent to landfill.
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