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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90th Percentile Tap Sample Result
Identification of the 90th percentile tap sample result is accomplished by following two steps:
Components of a water or waste water treatment system that are necessary to meet mission objectives (providing drinking water that meets or exceeds the National Drinking Water Standards, providing adequate water pressure to meet public safety needs, maintaining water service to critical users, maintaining wastewater collection system to protect public health, and providing wastewater treatment that meets the National Pollution Discharge Elimination System standards.
ACC - Alternative Compliance Criteria Alternative criteria that can be used to achieve either monthly or annual compliance with the enhanced coagulation requirements of the DBP Rule.
A condition in which a substance yields H+ ions when it dissociates in water, resulting in a lowering of pH.
The concentration of H+ ions in a solution, measured as pH.
A coagulant aid that is created on-site by neutralizing sodium silicate.
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).
Acute health effects
Adverse effect on human health as a result of short-term exposure. Acute health effects occur within hours or days of the time that a person consumes a contaminant.
Additional Routine Monitoring