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.
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A condition in which dissolved molecular oxygen is not present, however, some chemically bound oxygen may be present.
Also known as anaerobes. Bacteria that live and reproduce in an environment containing no "free" oxygen or DO (this type of environment is referred to as anoxic conditions). Anaerobic bacteria obtain their oxygen supply by breaking down chemical compounds which contain oxygen, such as sulfate.
A condition in which dissolved (atmospheric) oxygen is deficient, however, oxygen is available in the combined form (e.g., nitrate, sulfate and carbonate).
Also known as autotrophs. Organisms that use inorganic materials for energy and growth.
Organisms that use inorganic materials for energy and growth.
The concentration of OH- ions in a solution, measured as pH or, alternatively, pOH. A solution is basic if it has a pH higher than 7.0 or a pH lower than 7.0.
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.
Nutrient-rich organic material that are produced from the stabilization of sewage sludge and residential septage that meets specific quality criteria and are suitable for land application.
Biosolids (Exceptional Quality)
Biosolids that meet stricter pollutant and pathogen reduction criteria.