A bladed, rotating component of a water treatment plant; used to infuse air into the water.



Related Terms

LIME

A common water treatment chemical.

SETTLING BASIN

A containment design with external water treatment to settle sediments and to clarify.

STEAM GENERATING UNIT

A unit to which water, fuel, and air are supplied and in which steam is generated. It consists of a boiler furnace, and fuel burning equipment, and may include as component parts water walls, superheater, reheater, economizer, air heater, or any combination thereof.

EDTA

A chelating agent used with boiler water treatment. Often referred as the replacement for the phosphate-hydroxide treatment method.

DEMAND REGULATOR

A component of an open-circuit diving system that permits the diver to expel used air directly into the water without rebreathing exhaled carbon dioxide.

SODIUM SULFITE (Na2S03)

A chemical used with water treatment to remove small amounts of oxygen.

SODA ASH

A common water treatment chemical, sodium carbonate.

AIR DIFFUSION AERATORS

They are aerators into which air is pumped into the water through perforated pipes, plates, or any other method.

FURNACE DRAFT

The negative air pressure generated by buoyancy of hot gases inside a furnace. The temperature difference between gases within the furnace and in the atmosphere along with furnace and stack height basically determine the amount of draft generated by the furnace. Draft is generally measured in negative inches of water column. ('-w.c.'; 27.7 inches w.c. = 1 psig)

CLOSED SYSTEM

  1. A system for water handling that does not permit air to enter. 2. A system which is isolated so that it cannot exchange matter or energy with its surroundings and can therefore attain a state of thermodynamic equilibrium. Also known as isolated system.

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