Key difference
between primary and secondary sewage treatment:
- The primary sewage treatment is a mechanical
process involving the removal of coarse solid materials.
- It involves in removal of large particles and floating
materials such as leaves, papers, rags, solids such as sand, grit
and oily substances.
- It makes the used of sedimentation and filtration process,It is
relatively simple and less time consuming process.
Secondary sewage
treatment :
- It is a biological process involving the action of
microbes.
- It involves the removal of fine suspended and dissolved organic
matter.
- It makes the use of aerobic or anaerobic biological units
- It is relatively complex and takes a long time for its
completion.