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Trickling Filters in Wastewater Treatment

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Trickling Filters in Wastewater Treatment

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Questions and Answers

What is the purpose of alternating double filtration (ADF) in trickling filters?

To increase the capacity for organic loading (correct)

To reduce the settling time of effluent

To promote uniform distribution of effluent

To decrease the capacity for organic loading

Why is heavy film growth promoted in the first filter of the alternating double filtration (ADF)?

To encourage excess film removal when the filter sequence is reversed (correct)

To increase the settling time of effluent

To reduce the hydraulic loading rate

To decrease the organic loading rate

What are towers, as discussed in the text, primarily designed for in wastewater treatment?

To provide a natural habitat for microorganisms

To treat large volumes of strong industrial effluents (correct)

To promote the growth of higher organisms

To decrease oxygen transfer efficiency

What factor makes towers a space-saving solution in wastewater treatment?

They are lightweight and have high voidage Signup and view all the answers

What is the effect of starving a trickling filter beyond 48 hours, as discussed in the text?

Results in near failure of the filter Signup and view all the answers

What distinguishes biologically aerated filters (BAFs) from towers in wastewater treatment?

BAFs rely on higher organism predation for scouring Signup and view all the answers

What can cause ponding in a trickling filter bed?

Rapid build-up of bacteria, fungi, and algae at the top of the filter Signup and view all the answers

How can film growth in a trickling filter bed be limited?

Reducing the dosing frequency Signup and view all the answers

What percentage of suspended solids can a trickling filter bed remove at conventional organic loading rates?

90-95% Signup and view all the answers

What can be done to prevent blockage in a trickling filter bed when increasing the organic loading rate?

Increase hydraulic load for greater scouring of the bed Signup and view all the answers

What is the recommended range for organic loading rates in filters supplied with domestic sewage to achieve the Royal Commission (20:30) Standard?

0.07-0.1 kg BOD m-3 day-1 Signup and view all the answers

What effect does recirculating part of the treated effluent have on the organic loading rates in a trickling filter bed?

Increases organic loading rates Signup and view all the answers