Which of the following methods can not remove the non-separable emulsified oil in bilge water?（）

A.Raising temperature
B.less use of surfactant
C.more use of solvent
D.polishing device fouling prevention

A.more economic
B.larger capacity on oil treatment
C.less costive
D.more capable of separating emulsified oil

A.gravity separation
B.centrifuge
C.Cyclone
D.Cross-flow membrane filtration