Introduction to Water Treatment 060401e Flashcards
Where does essentially all of the fresh water supply come from?
Precipitation that falls on the land areas
The quantitative capacity of a water or water solution to neutralize an acid?
Alkalinity
The process of adding oxygen to water for oxidation of matter such as iron or to cause the release of dissolved gases such as dioxide or hydrogen sulphide from water
Aeration
The process in which beds of a filter or ion exchange media are subjected to flow opposite service flow direction to loosen the bed and to flush suspended matter collected during the service run to waste
Backwash
What elements when dissolved causes hardness in water?
Calcium and magnesium
What term is often used interchangeably with demineralization?
Deionization
One grain per US gallon is equal to how many milligrams per litre or parts per million?
17.1 mg/l or ppm
One grain per imperial gallon equals how many milligrams or ppm?
14.3
Trade name for a particular type of air induction or injector valve
Hydrocharger
A reversible process in which ions are released from an insoluble permanent material in exchange for other ions in a surrounding solution
Ion exchange
What is used to regenerate a manganese greensand filter?
Potassium permanganate
The percentage of TDS removed from the feed water
Rejection
Any water that contains less than 1.0 gpg of hardness minerals expressed as calcium carbonate
Soft water
The removal of calcium and magnesium, the ions with are the principal cause of hardness from water
Water softening
Porous media where grains are not connected to each other are considered what?
Unconsolidated