NPDES (Environmental Engineering) The National Pollutant Discharge Elimination System. The discharge criteria and permitting system established by the U.S. EPA as a result of the Clean Water Act and its subsequent amendments or the permit required by each discharger as a result of the Clean Water Act.
Organic nitrogen (Environmental Engineering) Nitrogen contained as amines in organic compounds such as amino acids and proteins.
Phenyl- (Environmental Engineering) A benzene ring named as a constituent group, C6H5-.
Runoff (Environmental Engineering) The water that flows overland to lakes or streams during and shortly after a precipitation event.
Suspended growth reactor (Environmental Engineering) A reactor in which the microorganisms are suspended in the wastewater. Examples of suspended growth reactors are activated sludge reactors and anaerobic digesters. See attached growth reactor.
Total dissolved solids (Environmental Engineering) (TDS) is the amount of dissolved matter in the water.
Total solids (Environmental Engineering) (TS) is the amount of organic and inorganic matter which is contained in a water.
Total suspended solids (Environmental Engineering) (TSS) is the amount of suspended (filterable) matter in a water.
Toxicity (Environmental Engineering) A U.S. EPA hazardous waste characteristic defined with a rigorous test procedure, the TCLP (for Toxicity Characteristic Leaching Procedure). In the procedure, a waste is extracted for 24 hours with an acetic acid solution. The acid extract is then analyzed for the presence of any of the contaminants listed in the procedure.
Trace contaminants (Environmental Engineering) Contamination found in trace (very low) levels.
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