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Water Glossary - Z
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Zero discharge
water: The principle
of ‘zero discharge’ is recycling of all industrial wastewater. This means that
wastewater will be treated and used again in the process. Because of the water
reuse wastewater will not be released on the sewer system or surface water.
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Zeta potential: An electrokinetic
measurement which can be used for the control of coagulation processes.
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Zone of
aeration: A region
in the Earth above the water table. Water in the zone of aeration is under atmospheric
pressure and will not flow into a well.
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Zone of
saturation: The
space below the water table in which all the interstices (pore spaces) are filled
with water. Water in the zone of saturation is called groundwater.
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Zooplankton: Tiny aquatic
animals eaten by fish.
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Zwitter
ions: Act as
cations or as anions according to the environment in which they find themselves.
In water technology they are usually organic macromolecules.
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