Effluent Filtration
Practice Quiz
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What is the basic purposes for effluent filtration?
- To make up for poor secondary treatment
- To remove ammonia
- To remove NO2 (nitrite)
- To remove TSS and viruses
Other than sand, what is a typical media used in rapid gravity filters?
- D.E. powder
- Anthracite coal
- Clay
- Talcum powder
What chemicals are typically used in the conditioning process before filtration?
- Chlorine
- Alum
- Polymer
- All the Above
Which type of filter is backwashed while the filter still remains in filtration service?
- Rapid gravity filter with individual compartments
- Deep bed filter with automatic valves
- Upflow filter with continuous backwash
- Shallow bed filter with no compartments
What chemical is used to inhibit algae growth in the filter media?
- Alum
- Polymer
- Chlorine
- Sodium bicarbonate
What happens to filtration when the media begins to build-up a solid layer on top?
- The performance will improve due to a finer filtering media
- The performance will decrease due to lack of contact between solids and filter media
- The filter water level will decrease
- The filter media will be lost with backwash.
What is the standard process to follow the effluent filtration system?
- Secondary
- Effluent pumping
- Chlorine contact chamber
- Tertiary collection
What is a typical hydraulic loading rate for average daily flows?
- About 1.0 gpm/ft2
- About 5.0 gpm/ft2
- About 2.0 gpm/ft2
- About 4.0 gpm/ft2
What is a typical hydraulic loading rate for peak daily flows?
- About 1.0 gpm/ft2
- About 6.0 gpm/ft2
- About 2.0 gpm/ft2
- About 4.0 gpm/ft2
When placing a rapid gravity filter into service, what step should be performed before introducing filter influent water?
- Backwash the media in a dry state
- Backfill the filter from the effluent channel to expel trapped air from within the media
- Pump air into the media to help fluidize the solids
- Introduce polymer into the media to assist in coagulation
Why should a sample of spent washwater be collected during a backwash?
- To check for solids content
- To check for chlorine residual
- To check for lost media
- To place into final effluent sampler
What are the units of this formula:
Total Solids Entering Filter, lbs/day ÷ Filter Surface Area, ft2
- gpd/ft2
- lbs/day/ft2
- gpm/ft2
- lbs/minute/ft2
What are the units of this formula?
Filter Inlet Flow, gpm ÷ Filter Surface Area, ft2
- gpd/ft2
- lbs/day/ft2
- gpm/ft2
- lbs/minute/ft2
Adding Powered activated carbon to biological systems can:
- Enhance the performance of the system and help maintain the water in a neutral pH range
- Adsorb lead, copper, chrone, and nickel contaminants
- Improve the settling characteristics of the mixed liquor suspended solids
- All of the above
Which of the following factors affect the performance of the activated carbon process?
- Molecular weight of the substance and chemical compostion of the compound
- Specific gravity of the wastewater and Adsoprtion Contact time
- Amount of ammonia in the influent to the carbon columns
- All of the above