Trickling Filters - Q&A

Question 1

What is the purpose of the under drain in a trickling filter?

a) Controls wastewater to filter media
b) Distributes flow evenly to the filter media
c) Collects untreated wastewater and distributes it to the top of filter
d) Collects treated wastewater and permits air flow to filter media

Answer 1

d) Collects treated wastewater and permits air flow to filter media

Question 2

What is the primary nuisance insect associated with the operation of a trickling filter?

a) psychoda flies
b) tachinid flies
c) syrphid flies
d) thrips

Answer 2

a) psychoda flies

Question 3

Voids between age filter media in a trickling filter:

a) must be kept open to allow sloughing of biology and proper air flow
b) must be kept plugged to allow proper detention time of wastewater
c) must be kept plugged to allow for retention of biology in the filter
d) must be kept open to allow for visual inspection of filters

Answer 3

a) must be kept open to allow sloughing of biology and proper air flow

Question 4

Another name for the slime growth on a trickling filter is

a) Slag
b) Zoogleal film
c) Algal mat
d) Humus

Answer 4

b) Zoogleal film

Question 5

A problem associated with trickling filter is:

a) bulking
b) protozoa
c) ponding
d) liquefaction

Answer 5

c) ponding