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(Environmental Engineering) The ion or molecule which surrounds or complexes with the central atom or ion.
(Environmental Engineering) A reaction in which the reactant(s) proceed to product(s), but the products react at an appreciable rate to reform reactant(s).
(english) A layout solution which turns a copper color when applied to a clean,polished metal surface.
(english) A vessel, normally cylindrical, which is used to store fluid and gas for future release of the energy in the compressed fluid and gas. Normally contains a diaphragm or piston between the fluid (liquid) and gas chambers. Fluid is normally introduced at one end and the gas at the opposite end.
(Environmental Engineering) Settling which occurs in the lower reaches of clarifiers where particle concentrations are highest. Particles can settle only by compressing the mass of particles below.
(Environmental Engineering) Organic compounds which contain the "-SH" functional group. Also called mercaptans.
(Concrete Engineering) Deleterious chemical and/or physical re-action between sulfates in ground water or soil and certain constituents in cement, which result in expansion and disruption of the concrete.
(Environmental Engineering) Water which is contained in geologic strata. Also properly written as two words, ground water.
(Environmental Engineering) Standards which set concentration or mass per time limits on the effluent being discharged to a receiving water.
(english) A “tool” or reinforcing part, which presses against the outer surface of an extrusion die, supporting it against the pressure of the extruding metal. The backer has an opening larger than the die aperture, allowing the extruded product to emerge without marring its soft surface.
A powdery substance made by burning, at a high temperature, a mixture of clay and limestone producing lumps called “clinkers” which are ground into a fine powder consisting of hydraulic calcium silicates. For non-portland cements, see aluminous cement.
(Environmental Engineering) Organisms which require molecular oxygen as an electron acceptor for energy production. See anaerobes.