Pa. DEP Operator eLearning Center

A condition in which dissolved (atmospheric) oxygen is deficient, however, oxygen is available in the combined form (e.g., nitrate, sulfate and carbonate).

• (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)

Organisms that use inorganic materials for energy and growth.

• (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)

Also known as autotrophs. Organisms that use inorganic materials for energy and growth.

• (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)

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.

• (BIO10) Estimating Sludge Volume (2343)
• (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)

A condition in which dissolved molecular oxygen is not present, however, some chemically bound oxygen may be present.

• (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)

Alternative Compliance Criteria (ACC)— Alternative criteria that can be used to achieve either monthly or annual compliance with the enhanced coagulation requirements of the DBP Rule.

1. A measure of the ability of water to neutralize an acid. It is measured in terms of calcium carbonate, CaCO₃, present in the water.
   • (COA01) Coagulation – Part 1: The Chemistry of Coagulation (1248)
   • (COA02) Coagulation – Part 2: Coagulation Chemicals (1249)
   • (DBP40) Enhanced Coagulation – Basics (1280)
   • (DBP43) Jar Testing for Process Control of Conventional Filtration: Part 1 (2019)
2. A measure of the ability of water or wastewater to neutralize acids. It is measured in terms of calcium carbonate, CaCO₃, present in the water. Alkalinity, which is expressed in milligrams per liter of equivalent calcium carbonate, is not the same as pH because water does not have to be strongly basic (high pH) to have a high alkalinity. Alkalinity is a measure of how much acid must be added to a liquid to lower the pH to 4.5.
   • (BNR01) Nitrification and Denitrification – An Introduction to Nitrogen Removal (1485)
   • (BNR02) Nitrification Factors – Suspended Growth Treatment Systems (1821)
3. The capacity of water or wastewater to neutralize acids. This capacity is caused by the water's content of carbonate, bicarbonate, hydroxide and occasionally borate, silicate and phosphate. Alkalinity is expressed in milligrams per liter of equivalent calcium carbonate. Alkalinity is not the same as pH because water does not have to be strongly basic (high pH) to have a high alkalinity. Alkalinity is a measure of how much acid must be added to a liquid to lower the pH to 4.5.
   • (BIO10) Estimating Sludge Volume (2343)

 

(DBP40) Enhanced Coagulation – Basics (1280)

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.

• (BIO10) Estimating Sludge Volume (2343)