The methods used for biological treatment are
...The methods used for biological treatment are
lagoon
activated sludge process
oxidation ditches
all of these
Correct answer is D
No explanation has been provided for this answer.
Zeolite softening process removes ...
Liquefaction of starch to dextrin is carried out by ...
Lagoons may be characterized as ...
Sulphydryl oxidase is used for ...
Permanent hard water may be softened by passing it through ...
Permanent hardness of water is caused by the presence of ...
The activated sludge process consists of returning a portion of the clarifier ...