Concerning the management of sewage treatment plant using activated sludge, which of the following is correct?()
Before marine sewage treatment plant works () should be filled with fresh water.
Which of the following is NOT among the solutions to the lack of sewage water treatment plants?
Disinfector in the sewage biological treatment plant usually is ()
()are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
A number of biological sewage treatments plants are in use at sea but nearly all work on the principle called ()
In sewage treatment, the term maceration refers to the process of ()
()are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.
According to Annex Ⅳ of comminuted and disinfected sewage using an approved system can be discharged when the ship is more than away from the nearest land()
Most marine biological sewage treatment plants consist of all the following statements except ().