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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.

Ultimate biochemical oxygen demand (BODu)

(Environmental Engineering) The total amount of oxygen required to oxidize any organic matter present in a water, i.e. after an extended period, such as 20 or 30 days.

Complexation

(Environmental Engineering) The ionic bonding of one or more central ions or molecules by one or more surrounding ions or molecules.

Facultative

(Environmental Engineering) A group of microorganisms which prefer or preferentially use molecular oxygen when available, but are capable of suing other pathways for energy and synthesis if molecular oxygen is not available.

Total suspended solids

(Environmental Engineering) (TSS) is the amount of suspended (filterable) matter in a water.

Virus

(Environmental Engineering) A submicroscopic genetic constituent which can alternate between two distinct phases. As a virus particle, or virion, it is DNA or RNA enveloped in an organic capsule. As an intracellular virus, it is viral DNA or RNA inserted into the host organisms DNA or RNA.

Anabolism

(Environmental Engineering) Biosynthesis, the production of new cellular materials from other organic or inorganic chemicals.

Substrate level phosphorylation

(Environmental Engineering) The synthesis of the energy storage compound adenosine triphosphate (ATP) from adenosine diphosphate (ADP) using organic substrates without molecular oxygen.

Eucaryotic organisms

(Environmental Engineering) Organisms which possess a nuclear membrane. This includes all known organisms except viruses and bacteria.

Reactive waste

(Environmental Engineering) A waste which; 1) reacts violently with water, 2) forms potentially explosive mixtures with water, 3) is normally unstable, 4) contains cyanide or sulfide in sufficient quantity to evolve toxic fumes at high or low pH, 5) is capable of exploding if heated under pressure, or 6) is an explosive compound listed in Department of Transportation (DoT) regulations. One of EPA's four hazardous waste properties.

Secured landfill

(Environmental Engineering) A landfill which has containment measures such as liners and a leachate collection system so that materials placed in the landfill will not migrate into the surrounding soil, air and water.

Landfill

(Environmental Engineering) A legal and controlled area for the placement of wastes into the ground.

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