Sewage treatment is
One-step process
Two-step process
Three-step process
Multi-step process
Sewage treatment is a three-step process
Primary Sewage Treatment
Secondary Sewage Treatment
Tertiary Sewage Treatment
A step in the sewage treatment process in which a part of the decomposer bacteria present in the wastes is recycle back into the biological treatment process:
The steps included the water treatment process are
The first two steps in the process of planning