A.in the presence of oxygenB.without oxygenC.in the pre……

单项选择题It is that reduce the BOD by converting the organic content of the sewage to a chemically and organically inert sludge（）

A.the bacteria
B.oxygen
C.oxidizing function
D.agitation function

单项选择题The basic process of biological sewage treatment consists of the liquor either by bubbling air through it or by agitating the surface（）

A.oxygenating
B.oxidizing
C.deoxygenating
D.proportioning

单项选择题When the garbage is mixed with some discharges having different disposal or discharge requirements, shall apply（）

A.any requirement appointed by the Officer
B.the most suitable requirement
C.the most stringent requirement
D.no requirement

单项选择题Disposal of all kinds of garbage but is prohibited within Special Areas（）

A.plastics
B.comminuted or ground papers, rags, glass, metal etc
C.food waste comminuted or ground
D.Incinerator ash

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

A.gravity separation
B.use of adsorbents
C.use of flocculents
D.use of chemical addition