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Taste and odor control
Terms in this set (24)
TF-The reaction of chlorine on algal cells results in the release of objectionable cellular materials into the water
TF-Chemical oxidation is a destructive technique used to control tastes and odors
TF-permanganate and moisture create a very corrosive mixture that will attack metal including electrical connections
TF-only by testing various carbons for affective removal of the objectionable taste or odor can a good comparison be made for a particular application
TF- powder activated carbon feed systems may be either dry type feeders or slurry feeders
TF- Application of odor treatment chemicals in amounts greater than the minimum dose may provide no further benefit to water quality and may actually impair water quality
What is geosmin?
A natural chemical byproduct of various species of actinomycetes and blue green algae
What is an example of a chloramine odor?
Dichloramine has a swimming pool or bleach odor
How are chlorophenols produced?
The result of phenols reacting with chlorine to form pharmaceutical and medicinal tastes and odors
What is respiration?
The metabolic process that consumes oxygen and releases carbon dioxide
What is a taste threshold test?
A method that uses a trained panel of individuals to identify, describe, and judge the intensity of taste and odor qualities in water
Taste and odor treatment methods are divided into which broad categories?
Removal and destruction
What is a critical aspect of potassium permanganate treatment?
What is a characteristic of potassium permanganate?
It is a dry, crystalline product
What is a characteristic of ozone?
Ozone is an unstable form of oxygen that is an extremely powerful oxidant
How is adsorption used in water treatment?
To remove taste and odor producing compounds by adding a material to which those compounds will attach themselves
Which types of activated carbon are used to remove taste and odor producing compounds from water?
Powdered activated carbon and granular activated carbon
Why is powdered activated carbon the most common technique used specifically for taste and odor control at water treatment plants?
Because of its non-specific action over a broad range of taste and odor causing compounds
What is a characteristic of powdered activated carbon?
Powdered activated carbon is a hydrophobic (has a dislike for water) material and mixes readily with water
How can the use of PAC for taste and odor removal interfere with filter performance at a water treatment plant?
Caking of PAC on the surface of filters may cause substantially shorter filter runs than expected
Why do granular activated carbon filters require periodic regeneration?
Because the capacity of the filter to adsorb and retain organic compounds decreases with time
Which items are the most common taste and odor compounds?
Phenols and chlorophenols
What does an operator do if a permanganate overdose occurs?
Increase the pH of the water for a short time to increase the rate in which the manganese is precipitated,
Use PAC to control the problem until the permanganate dosage rate adjusts to the correct level
What are the characteristics of chlorine dioxide?
Strongly oxidizing, unstable compound,
Is formed by reacting sodium chlorite and chlorine in a special chlorine dioxide generator,
It is used to treat tastes and odors caused by industrial pollution
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