What process occurs when oxygen is added to water causing a change in substances in the water and resulting in stable substances?
Oxidation
What may be the cause of floc break up after the flocculation process?
Mixing speed is to high
What is the term used to describe bacteria, viruses or other organisms capable of causing disease?
Pathogenic
Tastes and odors such as grassy, septic, musty and earthy are all related to what water quality related issue?
Algae
What term describes reducing the water velocity and allowing gravitational forces to remove heavier particles from water?
Sedimentation
Sedimentation basins all have four zones, the inlet zone, the settling zone, the outlet zone and what is the fourth zone?
Sludge zone
Which element of the sedimentation basin collects the water flowing out of the sedimentation basin and directs it to the effluent piping?
Effluent launder
The clumping together of smaller particles into larger particles by the use of chemicals is called _____?
Coagulation
What device is used to mix ozone with water?
Contactor
What is the name of the metal inserted into a water main and later weighed providing a measure of the water’s corrosiveness?
Coupon
In general what pH level will increase the corrosion rate in a distribution system?
A low pH
Which disinfectant will effectively kill Cryptosporidium, Giardia, protozoans, and some viruses?
Chlorine dioxide
What is the term used to describe the disinfection process where excess chlorine is available for disinfection and for every increase in the dosage there is a corresponding increase in the residual?
Breakpoint chlorination
How does a higher temperature effect the disinfection action of chlorine?
Higher temperatures increase the effectiveness of chlorine
What is the disinfection byproduct formed by the use of Ozone?
Bromate
What is the hold time, allowable storage prior to lab analysis, for properly preserved TTHM samples?
14 days
What type of valve is installed on the suction pipe to keep the pump and pipe full of water?
Foot valve
Which one of the following is not a filter media configuration?
Granular media
How often should sedimentation tanks be cleaned and inspected?
Minimum of twice a year
How should oil be added to pumps?
When the pump is at a complete stop
What should be provided on the discharge side of each pump, delivering water to the distribution system, to prevent backflow when the pump stops?
Check Valve
What is the term that describes when water is applied through the lantern ring to the packing as a lubricant?
Seal water
How many gallons of water are contained in 3,382 cubic feet?
1 cubic foot = 7.48 gallons = 3,382 cu/ft X 7.48 gallons = 25,297 gallons
What substance is used to regenerate greensand used for iron and manganese removal?
Potassium Permanganate
