16. What are the primary goals of sewage treatment process?
To raise wastewater quality.
Elimination of harmful substances, contaminants, and many others.
Preservation of the natural water resources' water quality.
To transform wastewater into something useful.
Avoiding hazardous infections.17. What are the BOD and COD in a sewage treatment plant?
The term "biochemical oxygen demand" refers to the amount of oxygen required for microbial decomposition of organic
matter (BOD). Chemical oxygen demand refers to the amount of oxygen needed to oxidise organic matter (COD).
18. What is the primary sewage source?
Everyday household tasks like as taking a shower, 몭ushing the toilet, washing clothes, and cleaning dishes all result in
wastewater. It has domestic or residential origins. Non-residential establishments like spas, taxidermy labs, furniture
restorers, instrument washers, and auto body shops are all major contributors to commercial wastewater.
19. How long ought a sewage treatment facility to operate?
Our systems don't need a lot of maintenance, despite popular belief. They can easily survive up to 20 years with appropriate
care and just need to be emptied out once or twice a year. They can be quite expensive to 몭x or replace if they are overused
or badly maintained, which will dramatically shorten their lifespan.
20. Why is the colour of sewage water black?
The development of sulphide (formed under anaerobic circumstances) interaction with the metals contained in sewage is
what gives the water its dark grey/brown and black colour.
21. How acidic is STP?
The pH of water discharged by sewage treatment facilities typically ranges from 6 to 9. Domestic sewage from residents has a
straight forward composition, and its PH value is typically maintained at around 7.
22. What distinguishes STP and ETP from one another?
Municipalities mostly employ STPs, or sewage treatment plants, to remove toxic components from sewage. Industries
typically utilise e몭uent treatment plants, or ETPs, to treat toxic and chemical waste.
23. How does PE a몭ect sewage?
The estimation of projected 몭ow rates can be done in a variety of ways. One approach is to determine the "population
equivalent" (PE) of a catchment, a design parameter, and translate it into a 몭ow rate. The PE is a projection of the amount of
wastewater treatment facility consumption. It is not a population count.