Screenings debris is mainly:

1.   ?    Inorganic material
2.   ?    Organic material
3.   ?    Total suspended solids
4.   ?    Egg shells

What is the basic purpose for the screenings removal process?

1.   ?    To stop bacteria growth
2.   ?    To protect downstream pipes, pumps, valves, and other components from plugging.
3.   ?    For sample testing
4.   ?    To remove inorganic material

A screenings removal unit with less than ½ inch openings is known as:

1.   ?    A coarse bar rack
2.   ?    A manual bar screen
3.   ?    A fine bar/filter screen
4.   ?    A comminutor

Grit is mainly:

1.   ?    Inorganic material
2.   ?    Organic material
3.   ?    Total suspended solids
4.   ?    Volatile solids

What is the basic purpose for the grit removal system?

1.   ?    To protect the valuable capacity of tanks and process units (by not filling them with grit).
2.   ?    To protect downstream equipment, pipe elbows, valve seats, pump impellers, and other components.from wear and erosion.
3.   ?    To improve chlorination
4.   ?    To improve sludge dewatering

What is the guideline velocity number for proper grit removal?

1.   ?    1.0 fps
2.   ?    1.5 fpm
3.   ?    1.0 fpm
4.   ?    1.0 rpm

What method of grit removal is the Pista Grit system?

1.   ?    Free vortex
2.   ?    Low velocity
3.   ?    High velocity
4.   ?    Forced vortex

Aerated grit chambers usually utilize what type of aeration system?

1.   ?    Mechanical
2.   ?    Diffused
3.   ?    Transverse
4.   ?    Low speed mixer

What device is more commonly used for separation of grit slurry?

1.   ?    Aerated grit chamber
2.   ?    Clarifier
3.   ?    Cyclone classifier
4.   ?    Air lift

What does H₂S smell like at high concentrations?

1.   ?    Rotten eggs
2.   ?    Anaerobic sludge
3.   ?    Sulfuric acid
4.   ?    No smell

What is H₂S?

1.   ?    Hydrogen peroxide
2.   ?    Hydrogen sulfide
3.   ?    Sulfuric acid
4.   ?    Hydrogen sulfate

What does H₂S turn into that causes the damage to concrete and metal?

1.   ?    Hydrogen peroxide
2.   ?    Hydrogen sulfide
3.   ?    Sulfuric acid
4.   ?    Hydrogen sulfate

What does H₂S smell like at low concentrations?

1.   ?    Rotten eggs
2.   ?    Anaerobic sludge
3.   ?    Sulfuric acid
4.   ?    No smell

Is H₂S lighter or heavier than air?

1.   ?    lighter
2.   ?    heavier

Which principle does the wet scrubber use for odor control?

1.   ?    Absorption
2.   ?    Adsorption
3.   ?    Desorption
4.   ?    Sequestering

Which principle does the activated carbon system use for odor control?

1.   ?    Absorption
2.   ?    Adsorption
3.   ?    Desorption
4.   ?    Sequestering

Which chemical is typically used for wet scrubber odor control at the headworks of a plant?

1.   ?    Acid
2.   ?    Polymer
3.   ?    Sulfur dioxide
4.   ?    Sodium hydroxide

Which chemical is typically used for wet scrubber odor control at the solids handling portion of a plant?

1.   ?    Acid
2.   ?    Polymer
3.   ?    Caustic soda
4.   ?    Sodium hydroxide

Which chemical is typically used to regenerate the carbon bed of an activated carbon odor control system?

1.   ?    Alum
2.   ?    Acid
3.   ?    Sodium hydroxide
4.   ?    Methanol

Which is true?

1.   ?    Activated carbon is very selective in the removal of odor contaminants
2.   ?    Activated carbon is very non-selective in the removal of odor contaminants

The main purpose of primary treatment is to remove:

1.   ?    Chlorine
2.   ?    TSS & CBOD₅
3.   ?    Ammonia
4.   ?    Inorganic material

Typical primary clarification removes TSS in which range?

1.   ?    20 to 30%
2.   ?    40 to 60%
3.   ?    25 to 30%
4.   ?    100%

What percent of the settleable solids are typically removed through primary clarification?

1.   ?    20 to 30%
2.   ?    40 to 60%
3.   ?    25 to 30%
4.   ?    100%

What adjustment is generally necessary when gas and/or solids rise to the surface of a primary clarifier?

1.   ?    Increase the amount of primary sludge withdrawal
2.   ?    Decrease the amount of primary sludge withdrawal
3.   ?    Stop pumping primary sludge
4.   ?    Gas and rising sludge is normal ... not a problem

What does SOR mean (associated with primary clarification)?

1.   ?    Standard Operating Regime
2.   ?    Sand Organic Rut
3.   ?    Surface Operating Rotation
4.   ?    Surface Overflow Rate

What is a typical range for an SOR within a primary clarifier?

1.   ?    1 to 2 Hours
2.   ?    100 to 200 gpd/ft
3.   ?    400 to 550 degrees C
4.   ?    800 to 1,000 gpd/ft²

What does this formula represent?

1.   ?    SOR
2.   ?    Detention Time
3.   ?    Removal Efficiency
4.   ?    Loading Rate

What is a typical detention time for a primary clarifier?

1.   ?    4 to 8 Hours
2.   ?    1 to 2 Hours
3.   ?    30 to 45 Minutes
4.   ?    15 Minutes at Peak Flow

Where is a typical location to pump primary sludge?

1.   ?    Aerobic Digestion
2.   ?    Secondary Clarifier
3.   ?    Anaerobic Digestion
4.   ?    Gravity Belt Thickener

Associated with primary clarifier scum, what does FOG mean?

1.   ?    Fully Organic Gold
2.   ?    Far Oily Gate
3.   ?    Fat Oil Grease
4.   ?    Fat Old Guy