Pathogens, Chlorine, and UV Disinfection Quiz

all of the above

Why is a lagoon treatment system good for removing pathogens in waste waster

Cholera,typhoid

which of the following is a disease found in waste water

15-20 minutes

the typical time range for chlorine contact time at peak flow in a chlorine contact tank is

High temperature, High PH

which of the following water conditions listed below would be the most difficult to disinfect

To prevent lamps from overheating in air

why must there be a constantly maintained water level to keep UV lamps submerged

Transmissivity

This parameter is defined as the % of 254 nm of UV energy that passes through 1 cm of water

Enterococcus

which of the following indicator organisms would be the best to use in marine environment or estuary samples

Free residual

production of hypochlorous acid in chlorine disinfection would be labeled as what type of residual

5:1

Nitrite lock conditions can produce chlorine to nitrite demands of

all of the above

what is a problem with the use of indicator organisms to help indicate contamination in a water sample

Venturi

Which component below is not a part of the chlorinator in a chlorine gas feed system

44.5 C

what is the incubation temperature when testing for fecal Coliform using the membrane filter or MPN method

Breakingpoint Chlorination

what is the term for the complete oxidation of ammonia by dosing chlorine until a free chlorine residual is obtained

Chlorination with sodium hypochlorite

which of the following disinfection methods has the potential to raise the pH of the water

sulfur dioxide

Which of the following is a gas that is the most common chemical used in dechlorination

6.5

which of the following pH levels would provide the best hypochlorous acid production and thus the best disinfection potential

sulfitevis and oxygen scavenger thus overdosing reduces DO in receiving stream

Sulfite reduces chlorine to chorine in the effluent

In absence of chlorine, sulfite is oxidized to sulfate

which of the following is true regarding the use of sulfite ions as dechlorination method in wastewater

Turbulence

in a UV disinfection system a perforated plate may be installed upstream to create ____ which ensures all water is exposed to UV light

Injector

Which of the following is the component in a chlorine gas feed system that is the point that chlorine gas is added to wastewater

pH

which of the following dose NOT effect the efficiency of UV disinfection

low pressure

Which type of UV lamp is the oldest most common technology what is the lowest energy consumption

10

what is the immediate danger to life or health (IDLH) PPM concentration for chlorine

1:1

what is the common ratio of sulfur dioxide to chlorine feed in dechlorination process

Calcium hypochlorite

a tablet feeder chlorination system will typically this type of chlorine compound

E. Coli

which of the following indicator organisms would be the best indication of a health risk