explain the main process in primary secondary and tertiary sewege systems
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Sewage systems of primary process is done with hands. In secondary process it is done within small factories and with small amount of labourers. In tertiary process it is done in very big factories with machines and with a huge amount of labourers.
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Sewage treatment is a process in which sewage is treated in order to remove its harmful constituents and making it environmentally safe. Its main purpose is to clean wastewater for discharge into streams or other receiving waters and for reuse.
Sewage treatment generally involves three stages: primary, secondary and tertiary treatment.
Primary treatment: In primary treatment sewage is kept in a basin where heavy solids from the sewage get settled down into the bottom while lighter solids float at the surface. These settled and floating materials are removed and the remaining liquid sewage is subjected to secondary treatment.Secondary treatment: This treatment is carried by certain microorganisms which remove all the suspended and dissolved biological matter. Chlorination is done to remove microorganisms from the effluent prior to its discharge for the tertiary treatment.Tertiary treatment: Treated water is then disinfected chemically (for example: dechlorination) or physically (for example: microfilteration) before discharging it into a stream, river, etc. The treated water may also be used for irrigation of fields, parks and golf course and if it is sufficiently clean, it can be used for groundwater recharge or agricultural purposes.
Sewage treatment generally involves three stages: primary, secondary and tertiary treatment.
Primary treatment: In primary treatment sewage is kept in a basin where heavy solids from the sewage get settled down into the bottom while lighter solids float at the surface. These settled and floating materials are removed and the remaining liquid sewage is subjected to secondary treatment.Secondary treatment: This treatment is carried by certain microorganisms which remove all the suspended and dissolved biological matter. Chlorination is done to remove microorganisms from the effluent prior to its discharge for the tertiary treatment.Tertiary treatment: Treated water is then disinfected chemically (for example: dechlorination) or physically (for example: microfilteration) before discharging it into a stream, river, etc. The treated water may also be used for irrigation of fields, parks and golf course and if it is sufficiently clean, it can be used for groundwater recharge or agricultural purposes.
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