What is the surface area of the plastic conventional packing material used in trickling filters as the packing medium?

For rock type low filtration rate trickling filters what would be the recycling ratio assumed?

For rock type of roughing packing trickling filter what will be the hydraulic loading rate?

What is the surface wash rate?

Tube settlers are operated in which mode?

What is the rate of backwash water?

Micro-organisms metabolize the ___that exists after primary clarification.

While designing a clariflocculator what is the maximum limit velocity that is assumed?