12 Questions
What is the purpose of alternating double filtration (ADF) in trickling filters?
To increase 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
What are towers, as discussed in the text, primarily designed for in wastewater treatment?
To treat large volumes of strong industrial effluents
What factor makes towers a space-saving solution in wastewater treatment?
They are lightweight and have high voidage
What is the effect of starving a trickling filter beyond 48 hours, as discussed in the text?
Results in near failure of the filter
What distinguishes biologically aerated filters (BAFs) from towers in wastewater treatment?
BAFs rely on higher organism predation for scouring
What can cause ponding in a trickling filter bed?
Rapid build-up of bacteria, fungi, and algae at the top of the filter
How can film growth in a trickling filter bed be limited?
Reducing the dosing frequency
What percentage of suspended solids can a trickling filter bed remove at conventional organic loading rates?
90-95%
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
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
What effect does recirculating part of the treated effluent have on the organic loading rates in a trickling filter bed?
Increases organic loading rates
Learn about the challenges and solutions in operating trickling filters for wastewater treatment, including issues with rapid microbial growth and clogging. Understand the importance of controlling biofilm growth and dosing frequency for optimal filter performance.
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