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Book 2 Ch 3b&c - Specialized Treatment Processes Practice Quiz

front 1

Reactions between chlorine and industrial organic chemicals or precursors in water from natural organic compounds form what?

back 1

Trihalomethanes

front 2

How does water temperature and pH affect the rate of THM formation?

back 2

Higher water temperature and higher pH increases the rate of THM formation

front 3

What chemicals can be added to ensure oxidation of neutrally charged arsenic As(III) to a negatively charged As(V) form?

back 3

Chlorine or potassium permanganate

front 4

What is the MCL for total trihalomethane?

back 4

0.080 mg/L

front 5

Which THM can be the hardest to remove using PAC?

back 5

Chloroform

front 6

US EPA approved laboratory methods for analyzing arsenic in drinking water are performed with what instruments?

back 6

Mass spectrometry and atomic adsorption

front 7

With most all the arsenic removal treatment methods available, what is a common problem they share?

back 7

Waste product disposal

front 8

Which method of chloramination could produce taste and odors in the water?

back 8

Pre-ammonation

front 9

What are the three methods of removing THMs after they have formed?

back 9

Aeration, oxidation, adsorption

front 10

Samples for TTHMs must be analyzed within how many days by the laboratory?

back 10

14 days

front 11

What is the process called where ammonia is biologically converted to nitrite and nitrate?

back 11

Nitrification

front 12

Why must air bubbles be prevented from samples collected for TTHMs?

back 12

The trapped air allows TTHMs to be released from the water

front 13

What can be used in an adsorption process to remove arsenic from drinking water?

back 13

Activated alumina

front 14

There are the three options available to control THM formation: Remove THMs after they have formed, use a disinfectant other than chlorine and what other option?

back 14

Remove THM precursors before chlorine is added

front 15

What is the MCL for arsenic?

back 15

0.010 mg/L

front 16

Why is aeration not effective at removing THM precursors?

back 16

THM precursors are not volatile