Equation
Process
History and development
Maintenance
100
The letter V
What is the variable used for the volume of filter media?
100
Plastic, Rocks, slag, or gravel
What are the media used in trickling filters?
100
Developed naturally and over 100 years old.
What is a biofilter or trickling filter? Would also accept ‘sand filter’.
100
Some indicators include: Healthy, thin layer of biomass with entire surface wetted; All orifices are open and flowing;Level distributor arms that rotate continuously and smoothly; No ponding; No leaking
What are some indicators/characteristics of a well-operating trickling filter or biotowers?
200
The letter E1
What variable denotes the efficiency of BOD removal?
200
Offers space for microbes to live, and access for air and effluent.
What is pore space or porosity? Would also accept ‘surface area’.
200
15 ft to 40 ft
How tall are typical tower trickling filters?
200
This is a term refers to uneven shaft rotation.
What is loping?
300
The value for x in vertical-flow plastic and rock-medium filters
What is 0.5?
300
Both of these can achieve 30 mg/L in high rate trickling filters and 20 mg/L in standard rate trickling filters. Assume well maintained systems.
What is BOD5 and TSS?
300
2in to 4in
What is the ideal particle size for trickling filter media?
300
Anaerobic conditions can cause this to happen.
What causes Odors in a trickling filter?
400
The equation for the recirculation factor
What is (1+R)/(1+R/10)2?
400
Rotating biological contactor, activated biofilter, trickling filter/solids contact process, roughing filter/ activated-sludge process, biofilter/activated-sludge process, and series trickling filter/activated-sludge process
What are the different hybrid attached/suspended-growth processes?
400
The year that William Dunbar wrote the book that established the ideal particle size for trickling filter media
What is 1908.
400
The cause of this situation is due to organic overload, excess solids.
What is the cause of ponding/ plugging orifices?
500
The equation for efficiency of BOD removal for second stage filter
What is 100/[(1+(0.0561/(1-E1)*√(W2/V*F)]?
500
These are the predominating microorganisms in non-submerged trickling filters
What are facultative bacteria?
500
Based on an extensive study of trickling filters serving world war two military facilities, this NGO developed empirical relationships to predict the performance of trickling filters
Who is the National Research Council
500
This can cause decrease in detention time, biomass strip off, and decrease in organic removal efficiency.
What is excessive hydraulic flow.
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