Methods of Treatment and Equipment Installation - Part A 060401gA

Question 1

When using chlorine to treat bacteria, where would you locate an activated carbon filter and why?

Answer 1

Activated carbon is connected downstream of the chlorine injection point to remove the taste and odour of the chlorine solution present in the water

Question 2

What type of filters can be regenerated?

Answer 2

Point of entry tank type

Question 3

What is used to absorb tastes and odurs present in water?

Answer 3

Activated carbon

Question 4

Do nuetralizing filters require back wash?

Answer 4

Occasional backwashing to clean the filter bed

Question 5

What media is used in nuetralizing filters?

Answer 5

Calbium carbonate

Question 6

Neutralizing filters are effectice on water supplies having a pH between?

Answer 6

6 and 6.9

Question 7

In extreme cases where water has a pH between ___ and ___, what can be used to nuetralize the acidic conditions?

Answer 7

4.0 and 6.9

Soda ash feed using a metering pump

Question 8

Reverse osmosis works by a process known as what?

Answer 8

Membrane seperation

Question 9

In an RO system what word describes the rejected water and what word describes the product water?

Answer 9

Rejected water = concentrated stream

Product water = permeate stream

Question 10

How does ultravilot treatment effect water?

Answer 10

UV is strictly a disinfection process like chlorination in that numbers of micro-orgianisms are reduced to very low levels but not necessarily to zero

Disinfects but DOES NOT STERILIZE

Question 11

What is the maximum hardness that can be removed with a water softener?

Whats the maximum amount if iron that can be removed?

Answer 11

100 gpg

1.5 ppm

Question 12

When removing bacterial iron with a chemical free iron filter, what parameters must be met?

Answer 12

Water must have a minimum pressure of 20 psi, a pumping rate of 5 gpm and a pH of 6.5 or higher

Question 13

What is the void space at the top a minneral tank called and what is its purpose?

Answer 13

Freeboard

Allows for the filter media and gravel layers to be lifted, seperated and cleaned

Question 14

What is anthracite and how is it used?

Answer 14

Anthracite is commonly used in mulitmedia or mixed bed filters used for the removal of turbitity in a water supply caused by sand, silt, ferric iron and oxidized manganese and sulphur

Question 15

What is most effective on water supplies where pH correction is substantial?

Answer 15

Maganesium Oxide