F Mark certifies a product as meeting rigorous public health safety standards.
National Pollutant Discharge Elimination Discharge System permit is the regulatory document that was designed to control all discharges of pollutants from point sources into U.S. waterways.
A process in which bacteria change ammonia or organic nitrogen in wastewater into form of oxidized nitrogen, usually nitrate.
Substances that are required for supporting living plants and organisms.
Salt or acid containing phosphorus as PO4.
Oxidation is the addition of oxygen, removal of hydrogen or the removal of electrons from an element or compound.
Water intended for drinking, or general public consumption or use.
The reciprocal of the logarithm of the hydrogen ion concentration.
A high molecular weight substance that is formed be either a natural or synthetic process. Often called a “polymer”.
Natural polymers may be of biological origin or derived from starch products, cellulose derivatives and alginates. Synthetic polyelectrolyte consist of simple substances that have been made into complex, high molecular weight substances.
The first major and in some cases the only treatment step taken in a wastewater treatment plant. Usually sedimentation.
The process of deposition of suspended matter carried by water, wastewater or other liquid by gravity.
A test used to indicate the settling ability of activated sludge in the secondary clarifier.
A wastewater treatment process used to convert dissolved or suspended materials into a form more readily separated from the water being treated.
A condition produced by anaerobic bacteria. If severe, the water turns black, gives off a foul odor and contains little or no dissolved oxygen.
The arrival at a process or plant of a waste that is toxic to organisms in sufficient quantity or strength to cause operational problems.
A process that removes specific wastes not generally removed by conventional treatment processes.
The quantity of solids in water, wastewater or other liquids lost on ignition of the dry solids at 600oC.