Water Treatment 1 & 2 Mid-Term MSJC

1

Temperature has no effect on the sedimentation rate of a particle.

1

Chloramines are toxic to healthy humans.

1

If head loss is a problem but breakthrough is limited, larger sized media may be appropriate.

1

A slow sand filter should be backwashed when the head loss through the filter becomes excessive.

1

Coagulation and flocculation are used to remove materials, especially non-settleable solids and color.

1

The inlet zone of a sedimentation basin is designed to minimize velocities near the bottom of the basin to prevent scouring.

1

Smooth circular particles will settle slower than irregular particles.

1

Backwash at too high a rate is much less destructive than at too low a backwash rate

1

Water with low turbidity is just as difficult to treat as those with increased turbidity.

1

The detention time may be defined as the actual time that a small amount of water is retained in the sedimentation basin.

1

Chlorine gas is extremely toxic and corrosive in moist atmospheres.

1

In most types of filtration, particles are removed mainly by straining.

1

Free available residual chlorine has the greatest disinfecting action of the chlorine compounds.

1

A long, narrow rectangular sedimentation tank is the shape most likely to have short-circuiting problems.

1

The Interim Enhanced Surface Water Treatment Rule does not address Cryptosporidium.

1

The turbidity requirement under the Interim Enhanced Surface Water Treatment rule is < 0.3 NTU.

1

150 lb. chlorine cylinders may be stored on their sides

1

Ozone is highly reactive.

1

When water temperatures increase, the flow through a sedimentation basin must be decreased.

1

Too high a backwash rate may cause excessive loss of filter media.

1

Chlorine gas is lighter than air.

1

Alum Sludge is often returned to plant to "condition" raw water.

1

Rapid Sand filters trap suspended matter in the biologically active Schmutzdecke.

1

There is no minimum requirement for distribution chlorine residual under the SWTR.

1

Floc gathers together during the flash-mixing process.

1

If the chlorine demand has been met and there is still chlorine in the water, what is the remaining chlorine called?

1

Gas Chlorine is ______________________?

1

What is the difference between conventional and direct filtration?

1

Turbidity is the expression of the _____________ of the water?

1

Which of the following is more resistant to disinfection

1

Water with a pH of 9 would be considered?

1

Currents within a settling basin could cause _____________.

1

The main purpose of the jar test is to determine the best?

1

Filtration technologies used to comply with Surface Water Treatment Rule include

1

Organic matter combined with chlorine can create?

1

The coagulation process usually occurs within?

1

What is coagulation?

1

Field test method for chlorine is conducted using _________ method

1

Which is not a characteristic of a rectangular sedimentation basin?

1

Why should a minimum of two sedimentation basins be provided in all water treatment plants?

1

The Surface Water Treatment Rule requires and of Giardia

1

What is the purpose of the filtration process?

1

What is the purpose of the effluent zone in the sedimentation basin?

1

When added to water, chlorine will react with?

1

On the chlorination breakpoint curve, between points 2 & 3 chlorine reacts with ammonia to form?

1

What is flocculation?

1

A disinfected water supply is one in which

1

Which is not a form of Chlorine?

1

Why is ozone prepared onsite?

1

Which is the correct order of filter materials in a multi-media or mixed media gravity filter (From top to Bottom)?

1

Flash mixing includes

1

Tube settlers

1

Most natural occurring particles in water are ____________

1

The disinfectant with the greatest disinfection potential is?

1

The removal efficiency of a filter depends on the _____________

1

In determining the purity of a water sample, it is usually tested for the presence of coliform bacteria because ___________.

1

Most important filter effluent water quality change is?

1

Factors affecting particle settling include

1

How are particles removed by slow sand filtration?

1

Good filter media characteristics include?

1

Why is the turbidity of the water important when disinfecting water?

1

What could be the cause of floc size breaking up in flocculates?

1

Short circuiting in a sedimentation basin can be caused by

1

Which is not a zone in a sedimentation basin?

1

Destruction of harmful bacteria by chlorine is directly related to

1

Which is not an important factor when evaluating jar test results?

1

Visual checks of the sedimentation basin include?

1

The surface water treatment rule requires which removal rate for Giardia?

1

The Interim Enhanced Surface Water Treatment Rule requires the maintenance of a minimum distribution chlorine residual of?

1

Weak floc _____________?

1

What operation changes in the sedimentation process should be considered by operators when colder water temperatures develop?

1

For conventional filtration plant under the IESWTR, the allowable filter effluent turbidity measured in 95% of the samples collected in a month is ___________ NTU?

1

What is a limitation of using ultraviolet rays for disinfection?

1

The "Total Coliform Rule" of the SDWA regulations requires the result of coliform testing to be given as?

1

What is the maximum feed rate in pounds per day from a 150lb. chlorine cylinder?

1

The inactivation of pathogenic organisms is called?

1

The use of gas chlorine tends to _____________ the pH

1

Parameters which affect disinfection include

1

Chlorine Dioxide is composed of ______________ and chlorine

1

Sodium Hypochlorite is the active ingredient in _______________

1

The reaction zone in a solids contact clarifier is 15 feet in diameter and 8 feet high. What is the detention time in minutes if the flow is 5 million gallons per day?

1

A well has a flow of 2500 rpm and a chlorine residual of 2.0 mg/L is required. The demand is 0.5 mg/L. If calcium hypochlorite 65% available chlorine is used, how many lbs./day of hypochlorite is required?

1

Calculate the filtration rate in gallons per minute, per square foot (GPM/ft2) for a filter with a length of 50 feet by 40 feet when the applied flow is 3 million gallons per day?

1

Treatment plant has a flow of 900 GPM and an average turbidity of 10 ntu. A total of 180 lbs. of alum is used in 24 hours. What is the alum dosage in mg/L?

Mid-Term for Water Treatment 1 & 2 for MSJC

Water Treatment 1 & 2 Mid-Term MSJC

Temperature has no effect on the sedimentation rate of a particle.

Chloramines are toxic to healthy humans.

If head loss is a problem but breakthrough is limited, larger sized media may be appropriate.

A slow sand filter should be backwashed when the head loss through the filter becomes excessive.

Coagulation and flocculation are used to remove materials, especially non-settleable solids and color.

The inlet zone of a sedimentation basin is designed to minimize velocities near the bottom of the basin to prevent scouring.

Smooth circular particles will settle slower than irregular particles.

Backwash at too high a rate is much less destructive than at too low a backwash rate

Water with low turbidity is just as difficult to treat as those with increased turbidity.

The detention time may be defined as the actual time that a small amount of water is retained in the sedimentation basin.

Chlorine gas is extremely toxic and corrosive in moist atmospheres.

In most types of filtration, particles are removed mainly by straining.

Free available residual chlorine has the greatest disinfecting action of the chlorine compounds.

A long, narrow rectangular sedimentation tank is the shape most likely to have short-circuiting problems.

The Interim Enhanced Surface Water Treatment Rule does not address Cryptosporidium.

The turbidity requirement under the Interim Enhanced Surface Water Treatment rule is < 0.3 NTU.

150 lb. chlorine cylinders may be stored on their sides

Ozone is highly reactive.

When water temperatures increase, the flow through a sedimentation basin must be decreased.

Too high a backwash rate may cause excessive loss of filter media.