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31 Cards in this Set

  • Front
  • Back

Biochemical Oxygen Demand


(BOD)

A measure of the strength of the wastewater. Measures the amount of organic matter which can be biologically oxidized during a specified time period (normally 5 days) at a specified temperature (normally 20*C.

Total Suspended Solids


(TSS)

A test that measures the total amount of solids suspended in a sample.

pH

A measure of the alkalinity of a sample on a scale 0-14 (acidic-alkaline). pH 7 is neutral.

Dissolved Oxygen (DO)

Free or elemental oxygen which is dissolved in water.

Composite Sample

A sample prepared by combining a number of grab samples, typically over a 24 hour period.

Grab Sample

A single sample taken at a particular time and place that is representative of the current conditions.

Weir

A device used to measure wastewater flows.

Activated Sludge

The mixture of solids and microorganisms used to treat wastewater using the activated sludge process.

Advanced Waste Treatment

Treatment technology to produce an extremely high quality discharge.

Buffer

A substance or solution which resists change in pH.

Chemical Oxygen Demand

The amount of chemically oxidized materials present in the wastewater.

Clarifier

Also known as a settling or sedimentation basin. Designed to permit solids to settle or rise and be separated from the flow.

Combined Sewer

A collection system which carries both wastewater and storm water flows.

Comminution

A process to shred solids into small less harmful particles.

Detention Time

The theoretical time the water remains in a tank or channel at a given flow rate.

Floc

Solids which have come together to form larger solids which will settle better. May be chemically or biologically formed.

Flume

A device used to measure flow rate.

Infiltration

Water entering the collection system through cracks, joints or breaks.

Inorganic

Mineral material such as salt, ferric chloride, iron, sand gravel, etc., which are not effected by biological activity.

Nitrogenous Oxygen Demand

A measure of the amount of nitrogenous compounds which can be biologically oxidized in a specific period of time and a specified temperature.

Nutrients

Substances required to support living organisms. May include such elements as carbon, hydrogen, oxygen, sulfur, nitrogen and phosphorus. In many instance the term nutrient is used to refer to nitrogen and phosphorus levels.

Organic

Material which consist of carbon, hydrogen, oxygen, sulfur, and nitrogen. Many organics are biologically degradable. All organic compounds can be converted to carbon dioxide and water when the subjected to high temperatures.

Sanitary Wastewater

Waste which include both sewage and industrial waste.

Scum

A mixture of float able solids and water which is removed from the surface of the settling tank.

Secondary Treatment

Treatment proceed which convert soluble and colloidal organic solids to more stable solids which can be removed by settling. Secondary treatment processes rely on biological process.

Septic

Wastewater which has no dissolved oxygen present. Generally characterized by black color and rotten egg (hydrogen sulfide) odors.

Sewage

Wastewater containing human wastes.

Sludge

A mixture of settle able solids and water which is removed from the bottom of the settling tank. also known as bio solids.

Storm Sewer

A collection system designed to carry only storm water runoff.

Wastewater

The water supply of the community after it has been soiled by use.

Zoogleal Slime

The biological slime which forms on the fixed film treatment devices. It contains a wide variety of organisms essential to the treatment process.