_________ is defined as a volume in ml occupied by 1 gram of solid in the mixed liquor after 30 minutes of settling.
(a) BOD loading
(b) Suspended solid volume
(c) Sludge volume index
(d) Organic loading
This question was posed to me in an interview.
The question is from Design of Activated Sludge Plant in chapter Sewage Filtration and Activated Sludge Process of Environmental Engineering