This shows the specialized terms used in EarthWise Academy. This section contains all the definitions used in the various course glossaries used by each course.
Activated Sludge Process
A biological treatment process in which a mixture of wastewater and activated sludge is agitated and aerated. The activated sludge is subsequently separated from the treated wastewater by settlement and recycled or wasted. Although the configuration of activated sludge plants vary, the activated sludge process includes one or more aerated reactors that keep the solids in suspension; a liquid-solids separation device known as a clarifier; and a method of recycling the separated sludge from the clarifier back to the aerated reactor(s).
The accumulation of one material on the surface of another material through physical bonds
Consists of additional biological or chemical treatment processes (beyond secondary treatment) that are employed to remove constituents such as nitrogen and phosphorus, that are not reduced significantly as a result of secondary treatment. Any process of water renovation that upgrades treated wastewater to meet specific reuse requirements. May include general cleanup of water or removal of specific parts or wastes insufficiently removed by conventional treatment processes. Typical processes include chemical treatment and pressure filtration.
Also called aerobes Bacteria that must have molecular (dissolved) oxygen to survive. Bacteria that will live and reproduce only in an environment containing oxygen, which is available for their respiration (breathing), namely atmospheric oxygen or oxygen dissolved in water. Oxygen combined chemically, such as in water molecules (H2O), cannot be used for respiration by aerobic bacteria.
Agronomic Loading Rates
The annual whole biosolids application rate designed to:
A condition in which dissolved (atmospheric) oxygen is deficient, however, oxygen is available in the combined form (e.g., nitrate, sulfate and carbonate).
Organisms that use inorganic materials for energy and growth.
Biochemical Oxygen Demand
Biochemical Oxygen Demand — BOD A measure of the oxygen required to break down organic materials in water using biological means. The amount of oxygen required to oxidize any organic matter present in water during a specified period of time, usually 5 days. It is an indirect measure of the amount of organic matter present in water that is used to monitor natural waters and processed effluents discharged into natural waters.
Microrganisms growing and reproducing in a controlled environment are used to partially stabilize (oxidize) organic matter.