Question

What are the differences between primary and secondary wastewater treatment?

Answer 1

1. Primary wastewater treatment: It is a process of cleaning the wastewater by the application of physical processes.
2. Secondary wastewater treatment: It is a process of cleaning the wastewater by the application of biological processes.

S.no	Primary wastewater treatment	Secondary wastewater treatment
1.	It is the first step in the treatment of sewage.	It is the second step in the treatment of sewage.
2.	The goal of this treatment is to get rid of any particles that have settled or are floating in the water.	It involves the digestion of organic matter by microbes. In secondary treatment, the biological oxygen demand (BOD) of sewage or waste water is greatly lowered.
3,	It is carried out by sedimentation and filtration processes.	This method requires biofiltration, aerobic, and anaerobic processes.
4.	This method requires a shorter time.	This method requires a longer time.