T2 Certification: Water Treatment Process

Front 1

Water treatment utilizing the process of coagulation / rapid mixing flocculation and filtration is referred to as

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Direct filtration

Front 2

Flocculation and sedimentation are examples of

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Physical treatment processes

Front 3

The term for the waste stream generated by sedimentation process is referred to as

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Sludge

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The most common form of primary coagulant is

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Alum

Front 5

The optimum coagulant dosage is estimated in the laboratory by the

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Jar test

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Nonsettable solids are classified as________solids

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Suspended Collodial and dissolved

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Compliance with the enhanced coagulation rule can be accomplished by carrying out the following

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Lowering the pH of raw water significantly increasing the amount of coagulant added to a raw water removing a set amount of Toc based on the amount of Toc in the water and the source water alkalinity

Front 8

Colloidal particles resist coalescing and coagulation because of their

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Surface charge

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The primary function of a flocculation Basin is to

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Increase the number of particle collisions and grow the floc

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Is polyphosphates in chlorine is used to inhibit iron and manganese what do you add first

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First polyphosphate

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What chemical should you add to remove color in raw water

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Alum

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The type of currents that may be found in a typical sedimentation tank include the following

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Surface density Eddy currents

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The four zones on a conventional sedimentation tank are

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The inlet settling sludge and Outlet sounds

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Fluoride in water is dose differently in the summer and winter why

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The drastic changes of water consumption between summer and winter

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The coagulation flocculation process is dependent on the following two produces satisfactory floc

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Raw water temperature the pH of raw water the amount of alkalinity present or absent from the raw water

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Adding cationic polymer is to Raw water will help

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Prevent floc from Easley shearing neutralize the negative charges that colloids hold agglomerate microfloc to build a macro flocks

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Sedimentation can be improved by

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Maintaining a uniform horizontal low-velocity flow across the basin

Front 18

The following can be said about colloid particles

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Failure to remove them before they reach the filter beds can result in dramatically increased ability level readings on the effluent side of the filters they are negatively charged charged neutralization with a coagulant Aid like a cationic polymer accelerates the removal from raw water

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Why were high rate tube settlers developed

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To increase the settling efficiency of conventional rectangular sedimentation basins

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Solids contact basins and sludge blanket clarifiers are also called

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Upflow clarifiers

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Both Alum and ferric sulfate are affected by

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Alkalinity

Front 22

Van del walls principle is based on particle

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Attraction forces

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Sodium hydroxide is used in water treatment for

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pH stabilization

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Which synthetic organic chemical compound is used as a coagulant and or filter Aid in conventional water treatment plants

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Polyelectrolytes

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Important operating reason for adding powdered activated carbon ahead of the normal coagulation flocculation and filtration is that

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Carbon treatment should not be allowed to interfere with disinfection

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The most desirable place to feed activated carbon in a lime soda ash softening plant is

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to raw water at earliest-stage possible

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The purpose of adding carbon dioxide to water after a chemical precipitation softening process is to

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Restore the carbonate balance

Front 28

Harness remaining in finished water within a range of 50 to 85 mg per liter as CaCO3 is

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Desirable intends to prevent corrosion problems

Front 29

At 9 a.m. a pressure transducer located at the bottom of 100 foot diameter storage tank used to measure water levels indicates 10psig at 5 p.m. the pressure transducer indicates 6 PSIG determine the gallons of water used during The 8 Hour.

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542554 gallons

Hint 29