Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

distribution 1 > Disinfection > Flashcards

Disinfection Flashcards

Distribution 1

1
Q

living organisms, microscopic and usually consist of a single cell, use organic matter for their food and produce waste products as a result of their life processes

A

bacteria

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

a means of measuring chlorine concentration by color development resulting from a chemical reaction between chlorine and the reagent DPD ( darker color, high concentration)

A

DPD chlorine analysis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

addition of chlorine to water until the chlorine demand has been satisfied

A

breakpoint chlorination

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

compounds formed by the reaction of hypochlorous acid (or aqueous chlorine) with ammonia

A

chloramines

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

difference between the amount of chlorine added to water and the amount of residual chlorine remaining after a given contact time

A

chlorine demand

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

concentration of chlorine present in water after the chlorine demand has been satisfied

A

chlorine residual

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

organic compounds combined with chlorine

A

chlororganic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

group of bacteria found in the intestines of warm blooded animals and also in plants, soil, air and water

A

coliform

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

sum of the chlorine species composed of free chlorine and ammonia, including monochloramine, dichloramine, and trichloarmine

A

combined chlorine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

process designed to kill of inactivate most microorganisms in water, including essentially all pathogenic bacteria

A

disinfection

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

portion of the total available residual chloronine composed of dissolved chlorine gas (cl2), hypochlorous acid (HOCl), and hypochlorite ion (OCl-) remaining in water after chlorination

A

free available residual chlorine

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

High Test Hypochlorite (HTH)

A

calcium hypochlorite or Ca(OCl)2

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

describes organisms that use organic matter for energy and growth

A

heterotrophic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

chemical compounds containing available chlorine used for disinfection ( available in liquids or solids, in barrels, drums, or cans

A

hypochlorite

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

weak acid that is formed when chlorine is mixed with water ( strongest disinfectant of the different forms of chlorine

A

hypochlorous acid (HOCl)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Most Probable Number of coliform group organisms per unit volume of sample water

A

MPN

17
Q

an aerobic process in which bacteria reduce the ammonia and organic nitrogen in water into nitrite and then nitrate

A

nitrification

18
Q

organisms including bacteria and viruses or cysts that are capable of causing diseases in a host

A

pathogenic organisms

19
Q

What are the most commonly used hypochlorite compounds?

A

Sodium hypochlorite followed by calcium hypochlorite

20
Q

What are the 3 methods used for disinfecting water mains?

A

1) Tablet method
2) Continuous Feed method
3) Slug method

21
Q

Best suited for short sections of pipe and on small diameter pipes

  • sufficient tablets are added to give a dose of 25-50mg/L
  • pipe is slowly filled with water and left for 24 hrs
  • residual should be greater than 25mg/L through out the pipe
A

tablet method

22
Q

preliminary flushing

  • solution of at least 25mg/L free chlorine injected into pipe as its being filled
  • added at a ratio to ensure a 10 mg/L residual will remain and the end of 24 hrs
A

continuous feed method

23
Q

used for long, large diameter mains

  • calcium hypochlorite tablets are placed in the main during construction and filled with water
  • dose to produce a concentration of 100 mg/L with contact time of 3 hours
  • ensure >50mg/L residual
A

slug method

24
Q

What are the 3 methods to disinfecting storage tanks?

A

1) Complete fill
2) Surface Spray
3) Partial fill

25
Q

tank filled to overflow and enough chlorine for 10mg/L residual

  • if gas is used-6 hour contact time
  • if hypochlorite is used-24 contact time
  • residual is reduced to 2mg/L following contact time
A

complete fill method

26
Q

all surfaces that may contact water are coated with a 200 mg/L chlorine solution
- minimum contact time of 30 min and then tank is filled to the overflow pipe

A

surface spray method

27
Q

fill storage tank to 5% of total capacity

  • add chlorine to bring residual to 50mg/L for at least 6 hours
  • fill tank to overflow level with chlorinated water and hold for 24 hrs
  • residual must be at least 2 mg/L after 24 hrs
A

partial fill method

distribution 1 (7 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions