Book 1 Ch 1 - Introduction to Water Treatment Practice Quiz: CB Water Treatment Plant Operations V3 Flashcards


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1

What is potentially the most hazardous situation to deal with at a water plant?

A chemical spill

2

What is the recommended finished water target turbidity level?

0.1 NTU

3

These metallic elements can cause staining of plumbing fixtures and clothes

Iron and manganese

4

What is the goal of all water plants?

To produce a filtered water with the lowest practical level of turbidity

5

Most accidents at a water treatment plant are the result of what?

Carelessness and/or negligence

6

The treatment of water may depend on factors such as the impurities in the raw water source, the finished water quality standards, the demand for the water by the community and what other condition?

Treatment cost considerations

7

What is the MCL for radium 226 & 228?

5 pCi/L

8

What is the secondary MCL for iron?

0.3 mg/L

9

What is the purpose of adding a coagulant, like aluminum sulfate (alum), to the raw water?

To help remove light, fine particles from the water

10

What are sources of water for a water treatment plant?

A stream, river or well

11

What are the three major water quality indicators that effect the efficiency of copper sulfate as an algicide?

•Alkalinity, algae species, and outdoor temperature

•pH, chlorine residual and conductivity

•Alkalinity, settleable solids and chlorine demand

•Water temperature, suspended matter and alkalinity

12

Items essential to a sanitary survey include identification of potential hazards, the determination of factors that affect water quality and which other condition?

•The selection of treatment requirements

•The demand of the finished water product

•The amount of process waste products

•Hiring of qualified operators

13

A condition where surface waters warm rapidly, expand, and become lighter than the lower, colder waters is called?

Thermal stratification

14

According to the SDWA, a Public Water System is one that:

Has at least 15 service connections and serves an average of 25 people daily for at least 60 days per year

15

If a lake has a surface area of 5 acres, what is the surface area as square feet?

217,800 sq ft

16

Convert 9,785,500 cubic feet to gallons

73,195,540 gallons

17

Aeration and Re-aeration are methods of what?

Reservoir destratification

18

A disagreeable rotten egg odor noticed in a groundwater source is caused by what?

Hydrogen sulfide

19

How many Nephelometric Turbidity Units (NTU) will produce a water that is usually objectionable for aesthetic reasons?

5.0 NTU

20

Soft water, turbidity, suspended solids and microbial contamination are characteristics of what raw water source?

Surface water