Question

What is the key difference between primary and secondary sewage treatment?

Answer 1

PRIMARY SEWAGE TREATMENT-  

1- It is a physical method of treatment.

2- It involves in removal of large particles and floating materials such as leaves,papers,rags,solids such as sand, grit and oily substances.

3- it makes the used of sedimentation and filtration process.

4- it is relatively simple and less time consuming process.

SECONDARY SEWAGE SYSTEM-

1-it is a biological method of treatment.

2-it involves the removal of fine suspended and dissolved organic matter

3- it makes the use of aerobic or anaerobic biological units.

4- it is relatively complex and takes a long time for its completion.