International Desalination Association.

Impingement and entrainment.

See “gallon, Imperial”.

The entrapment of fish and other marine life on the surface of an intake screen when a high water velocity prevents escape.

An energy recovery device used to recover pressure energy from reverse osmosis brine streams. Also known as Pelton Wheels.

The use of water from streams or aquifers that have received discharges from wastewater treatment plants.

The beneficial use of reclaimed water after releasing it for storage or dilution into natural surface waters or groundwater.

The penetration of water into the pores or interstices of the soil.

A compound that has very low solubility.

A condenser used between stages to reduce steam consumption in the steam jet vacuum system in an evaporator system.

The characteristic attributed to a substance that becomes less soluble with increasing temperature.

An electrically charged atom, molecule or radical.

(IX or IE) A chemical process involving the reversible exchange of ions between a liquid and a solid.

A measure of solution strength based on both the concentrations and valences of the ions present.

See “ion exchange”.

Independent water and power project.