12 Questions
What role do the bacteria play in the biological film within the filter system?
Break down complex organic materials
How do higher organisms such as protozoa contribute to the filter system?
Improve settling characteristics of solids
What can poison the development of the active slime layer in a filter system?
Toxic chemicals
What is the function of a slime layer in a low-rate filter system?
Accelerate the removal of loose microbial film
What is the main role of the large surface area created in the filter bed?
Improve settling characteristics of solids
Why is a simple filter inefficient when operated at high organic loading rates?
It breaks down complex organic materials inadequately
What is the main action of a trickling filter in wastewater treatment?
Metabolization of organic matter from the effluent
What is the recommended voidage (% air space of total bed volume) for packing material in trickling filters?
45-55%
Which type of packing material would be preferable in trickling filters due to its higher surface area and voidage?
Synthetic
What is the function of the secondary sedimentation tank or humus tank following a trickling filter?
Remove suspended matter from the effluent
How does a trickling filter differ from a typical filtration process?
It relies on micro-organisms adhering to the packing material
Why are some trickling filters designed in a rotary system?
To allow for more uniform hydraulic loading
Learn about the action of a trickling filter in a unit operation, which functions as a fixed film bio-reactor. Understand how settled effluent is treated by passing through a packed bed counter-current to a flow of air, with micro-organisms adhering to the packing matrix for the reduction of BOD.
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