oorganisms.
A mechanical device which facilitates the separation of solids from the liquid phase be use of super-saturated air to generate floatation bubbles.
Molecular oxygen dissolved in water or wastewater and is usually abbreviates as DO.
Wastewater or other liquid flowing from a tank, process or container.
A holding basin in which variations in flow or concentration are averaged.
Bacteria that can live under aerobic or anaerobic conditions.
The gathering together of finer particles to form larger particles.
GRAS means generally recognized as safe. It is the designation given to substances that are considered safe for direct or indirect additives to foods. For a substance to be considered GRAS it had to meet certain criteria. There are two basic ways for a substance to be designated as GRAS. The criteria for this process is given in detail in the Code of Federal Regulations Title 21, Volume 3, Parts 170.30. The Federal code is searchable from: http://www.gpoaccess.gov/cfr/retrieve.html
Wastewater or other liquid flowing into a tank, container or process.
A laboratory procedure for estimation of the amount of chemical that will be needed to achieve selected water quality standards.
Material Safety Data Sheet – an MSDS provide important product information for proper handling, storage, shipping and other areas that employees dealing with said product should know.
The mixing of activated sludge with raw wastewater and return sludge in an aeration tank. Mixed liquor may also refer to the contents of aerobic and anaerobic digesters.
The suspendedsolids in the mixed liquor of an aeration tank. Comprised of volatile and non-volatile suspended solids.
The organic or volatile suspended solids in the mixed liquor of an aeration tank. Commonly used to indicate viable bacteria content when compared to MLLS.
Organisms that exhibit or are capable of movement.
NSF is the only standards development and certification organization with over 50 years of dedicated service to public health safety and environmental quality. The NSF 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 soli