Sludge dewatering is a process where:

1.   ?    Microorganisms are removed
2.   ?    Water is removed from a liquid/solids suspension
3.   ?    Microorganisms are destroyed
4.   ?    Volatile solids are stabilized

The concept of sludge dewatering is to:

1.   ?    Increase total solids concentration
2.   ?    Decrease total solids concentration
3.   ?    Has no change at all in solids concentration
4.   ?    Convert suspended solids into settleable solids

The discharge from the belt press is:

1.   ?    Powered residue
2.   ?    Liquid
3.   ?    Sludge cake
4.   ?    5% Solids

The water removed by the belt press is called:

1.   ?    Mixed liquor
2.   ?    Effluent
3.   ?    Filtrate
4.   ?    Cake

The inlet conditioning process mixes the sludge with:

1.   ?    Polymer
2.   ?    Chlorine
3.   ?    Lime
4.   ?    Washwater

The pressure filtration stage of dewatering takes place as the loosely structured cake is:

1.   ?    Liquefied
2.   ?    Expanded
3.   ?    Compressed
4.   ?    Washed

The primary function of polymer is to:

1.   ?    Decrease solids content
2.   ?    Promote rapid water release (desorption)
3.   ?    Sterilize the microorganisms
4.   ?    Reduce the ammonia content

The main function of a hydraulic power unit is to:

1.   ?    Supply oil to drive the belt tension and steering circuits on the press
2.   ?    Supply sludge to the belt press
3.   ?    Distribute sludge to the belt press
4.   ?    Decrease temperature of the sludge

A fast belt speed may cause:

1.   ?    Smaller floc
2.   ?    Good gravity filtration and higher cake solids
3.   ?    Poor gravity filtration and lower cake solids
4.   ?    Decrease productive output

A slow belt speed may cause:

1.   ?    Larger floc
2.   ?    Good gravity filtration and higher cake solids
3.   ?    Poor gravity filtration and lower cake solids
4.   ?    Decrease the gravity section % solids

Venturi mixers are designed to:

1.   ?    Mix sludge and washwater
2.   ?    Mix sludge and polymer
3.   ?    Shear floc
4.   ?    Create floc

Usually, closing the venturi mixer arm will:

1.   ?    Create a smaller floc
2.   ?    Create a larger floc
3.   ?    Not affect floc size
4.   ?    Decrease mixing energy

Pick one potential problem with reducing the pressure zone tension too much:

1.   ?    Belt may become stretched
2.   ?    Belts may blind
3.   ?    Belts may fold and crease
4.   ?    Belts may break

Will hydraulic pressure be higher or lower or no change in the early morning?

1.   ?    Lower
2.   ?    Higher
3.   ?    No change

Which device is used to promote cake release in the discharge zone?

1.   ?    Mooning bar
2.   ?    Safety cable
3.   ?    Steering assembly
4.   ?    Doctor blade

Polymer with a positive charge is called?

1.   ?    Non-ionic
2.   ?    Anionic
3.   ?    Cationic
4.   ?    Reverse negative

Which type of polymer usually requires more mixing and aging time?

1.   ?    Water base
2.   ?    Dry powder
3.   ?    Dispersion
4.   ?    Emulsion

Very high belt tension pressure can cause:

1.   ?    Belts to blind
2.   ?    Increased life of belts
3.   ?    Belt speed to become too fast
4.   ?    Filtrate quality to improve

When starting a belt press filter press, you should:

1.   ?    Start feeding sludge before washwater is initiated
2.   ?    Start feeding polymer 10 minutes before initiating sludge feed
3.   ?    Initiate washwater before sludge feed is started
4.   ?    Set the hydraulic pressure to 700 psi

When sludge streaks are appearing on the belts, what should be done?

1.   ?    Clean the wash box nozzles
2.   ?    Increase the pressure zone tension
3.   ?    Decrease the washwater pressure
4.   ?    Increase the feed sludge flow

In a properly operated belt filter press, what is a typical solids content of the gravity section sludge?

1.   ?    1 to 2% TS
2.   ?    15 to 20% TS
3.   ?    4 to 8% TS
4.   ?    20 to 25% TS

What does this formula represent?

(lbs/day sludge feed - lbs/day sidestream) / lbs/day sludge feed x 100

1.   ?    Polymer dosage rate
2.   ?    Percent capture efficiency
3.   ?    Throughput production
4.   ?    Filtrate to feed ratio

Gravity section is flooding! What could cause this? select only one answer

1.   ?    Sludge feed rate is too low
2.   ?    Belts are blinded
3.   ?    Improper polymer conditioning
4.   ?    Belt speed is too high
5.   ?    b and c

How will a fast belt speed typically affect cake solids concentration?

1.   ?    Produce higher solids content
2.   ?    Produce lumpy sludge
3.   ?    Produce lower solids content
4.   ?    Produce window piles of thick sludge

How will a slow belt speed affect gravity section sludge concentration?

1.   ?    Produce higher solids content
2.   ?    Produce lumpy sludge
3.   ?    Produce lower solids content
4.   ?    Produce window piles of thick sludge