Correct option is D
In extended aeration ASP. hydraulic retention time is kept higher in the range of about 12 to 24 hours whereas in conventional ASP, hydraulic retention time is kept between 4 to 5 hours.
In extended aeration ASP. hydraulic retention time is kept higher in the range of about 12 to 24 hours whereas in conventional ASP, hydraulic retention time is kept between 4 to 5 hours.